Double-layer flow channel turbocharger controlled by curved surface valve

Abstract

The utility model discloses a double-layer flow channel turbocharger with curved surface valve control, which relates to the technical field of internal combustion engines, and comprises a double-layer flow channel turbine shell and a waste gas bypass system, the waste gas bypass system comprises a bypass hole and a valve assembly, and the bypass hole is communicated with the valve assembly. And the valve assembly is rotatably arranged in the double-layer runner turbine shell in a penetrating manner, so that the bypass hole can be sealed by the valve assembly. By means of the arrangement, more reliable waste gas sealing and accurate bypass control over the intense pulse double-runner turbine shell supercharger can be achieved through the innovative valve assembly under the condition that an existing traditional waste gas bypass supercharger deflation valve mode is not changed, and therefore the high-speed efficiency of the supercharger is improved while the low-speed performance of the supercharger is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of internal combustion engine technology, and in particular to a dual-flow turbocharger with curved valve control. Background Technology

[0002] With the continuous development of national emission regulations and user demands, turbocharging technology for engines, especially diesel engines, has made significant progress. The structure of exhaust gas turbochargers has evolved from the traditional fixed cross-section to exhaust bypass turbochargers that can take into account the low-speed torque of the engine. After the implementation of the China III emission regulations, the demand for engine turbochargers that can take into account both high-speed and low-speed performance has become increasingly strong. However, the exhaust gas sealing performance of current dual-flow turbochargers is poor, and they cannot guarantee the low-speed performance of the turbocharger while improving the efficiency of the turbocharger at medium and high speeds.

[0003] Therefore, how to provide a dual-flow turbocharger to at least partially solve the above problems is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a dual-flow turbocharger with curved valve control. It can achieve more reliable exhaust gas sealing and precise bypass control of the high-pulse dual-flow turbine housing turbocharger through innovative valve components without changing the exhaust valve form of the existing traditional exhaust bypass turbocharger. This improves the efficiency of the turbocharger at medium and high speeds while ensuring the low-speed performance of the turbocharger.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A dual-flow turbocharger with curved valve control includes a dual-flow turbine housing, characterized in that it further includes an exhaust gas bypass system, the exhaust gas bypass system including a bypass orifice and a valve assembly, the valve assembly being rotatably disposed within the dual-flow turbine housing so that the valve assembly can seal the bypass orifice.

[0007] Preferably, the valve assembly includes:

[0008] The valve body is designed with a curved surface shape that matches the shape of the bypass hole and is aligned with its center.

[0009] The rocker arm includes a rotating shaft and a connecting part. The rotating shaft passes through a double-layer flow channel turbine housing and is connected to the actuator. The connecting part is fixedly connected to the valve body.

[0010] Preferably, the valve body includes a connecting column and a sealing part. The sealing part has a cylindrical structure, and the connecting column is vertically arranged at the bottom center of the sealing part. The connecting column is used to connect the connecting part.

[0011] Preferably, the axis of the rotating shaft is offset from the center of the connecting part, the center of the connecting part is set in a through hole for fitting on the connecting column, the connecting part and the connecting column are fixedly connected by a positioning washer, and the connection method between the positioning washer and the connecting column is welding.

[0012] Preferably, the end of the connecting column is provided with a first step for limiting the axial movement of the connecting part, and a second step for installing a positioning pad.

[0013] Preferably, an elastic gasket is provided between the connecting part and the positioning gasket, and the elastic gasket is installed in the mounting groove provided on the upper side of the connecting part.

[0014] Preferably, the connecting part has an extension on the side opposite to the mounting groove, and the extension is fitted around the outer periphery of the connecting post when the connecting part is connected to the connecting post.

[0015] Preferably, the upper edge of the sealing part is provided with a flange to increase the sealing effect of the valve body.

[0016] Preferably, a bushing is provided around the outer circumference of the rotating shaft, and the bushing is connected to the actuator.

[0017] Preferably, the valve body is made of high-temperature resistant stainless steel or high-temperature resistant alloy material, and the opening of the sealing part gradually widens.

[0018] Compared with the above-mentioned background technology, the present invention provides a dual-flow turbocharger with curved valve control, including a dual-flow turbine housing and an exhaust gas bypass system. The exhaust gas bypass system includes a bypass hole and a valve assembly. The valve assembly is rotatably disposed in the dual-flow turbine housing so that the valve assembly can seal the bypass hole.

[0019] Specifically, at low engine speeds, the valve assembly can be driven to seal the bypass port, allowing the turbine housing's small flow channel to fully utilize the engine's pulse energy and improve low-speed performance. At medium engine speeds, the valve assembly is driven to rotate according to the control strategy. This rotation causes some exhaust gas to enter the turbine housing's large flow channel from the turbine housing's small flow channel through the bypass port, reducing the turbine inlet pressure and improving turbine efficiency. At the same time, a small amount of exhaust gas is bypassed to the turbine housing's outlet. At high engine speeds, as the valve assembly's opening angle gradually increases, more exhaust gas flows directly from the double-layered flow channel through the bypass port to the turbine housing's outlet. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the valve assembly structure provided in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the valve assembly provided in this embodiment of the present invention when it is opened at a small angle;

[0023] Figure 3 This is a schematic diagram of the valve assembly provided in this embodiment of the present invention when it is opened at a large angle.

[0024] in:

[0025] 01-Double-layer flow channel turbine casing, 02-Large flow channel, 03-Small flow channel;

[0026] 100-Bypass Hole;

[0027] 200-Valve assembly, 210-Valve body, 211-Connecting column, 212-Sealing part, 213-First step, 214-Second step, 215-Flange, 220-Rock arm, 221-Shaft, 222-Connecting part, 223-Extension, 230-Positioning gasket, 240-Elastic gasket, 241-Mounting groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "bottom", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0031] The purpose of this invention is to provide a dual-flow turbocharger with curved valve control. Without changing the exhaust valve form of the existing traditional exhaust bypass turbocharger, the innovative curved valve structure design achieves more reliable exhaust gas sealing and precise bypass control for the high-pulse dual-flow turbocharger. This ensures the low-speed performance of the turbocharger while improving its mid-to-high-speed efficiency and enhancing its NVH performance.

[0032] To achieve the above objectives, the present invention provides the following technical solutions:

[0033] Please see Figures 1 to 3 This embodiment provides a dual-flow turbocharger with curved valve control, including a dual-flow turbine housing 01 and an exhaust gas bypass system. The exhaust gas bypass system includes a bypass hole 100 and a valve assembly 200. The valve assembly 200 is rotatably disposed in the dual-flow turbine housing 01 so that the valve assembly 200 can seal the bypass hole 100.

[0034] The dual-flow turbocharger with curved valve control provided in this embodiment includes a high-pulse dual-flow turbine housing 01, an exhaust gas bypass system, an intermediate bearing system, and a compressor. The high-pulse dual-flow turbine housing 01 includes two exhaust gas inlets and two dual-flow channels with different cross-sectional areas (including a large flow channel 02 and a small flow channel 03). The exhaust gas bypass system includes a bypass port 100 in the dual-flow turbine housing 01 and a valve assembly 200.

[0035] Specifically, at low engine speeds, the valve assembly 200 can be driven to seal the bypass hole 100, allowing the turbine housing small flow channel 03 to fully utilize the engine pulse energy and improve low-speed engine performance. At medium engine speeds, the valve assembly 200 is driven to rotate according to the control strategy. This rotation allows some exhaust gas to enter the turbine housing large flow channel 02 from the turbine housing small flow channel 03 via the bypass hole 100, reducing the turbine inlet pressure and improving turbine efficiency. This solves the problem that existing ordinary planar exhaust valves can only bypass exhaust gas directly from the flow channel to the turbine housing outlet when open, and cannot allow exhaust gas to enter the large flow channel 02 from the turbine housing small flow channel 03. At high engine speeds, as the opening angle of the valve assembly 200 gradually increases, more exhaust gas flows directly from the double-layer flow channel to the turbine housing outlet via the bypass hole 100.

[0036] Preferably, the valve assembly 200 includes a valve body 210 and a rocker arm 220; the valve body 210 is configured with a curved surface shape that matches the shape of the bypass hole 100 and is aligned with the center; the rocker arm 220 includes a rotating shaft 221 and a connecting part 222, the rotating shaft 221 passes through the double-layer flow channel turbine housing 01 and is connected to the actuator, and the connecting part 222 is fixedly connected to the valve body 210.

[0037] Specifically, such as Figure 1 As shown, the valve assembly 200 includes a valve body 210 and a rocker arm 220. The valve body 210 is configured with a curved surface shape that matches the shape and center of the bypass hole 100 of the double-layer flow channel turbine housing 01, and is provided with a certain gap in the circumferential direction and bottom surface of the bypass hole 100. The upper surface of the valve body 210 can contact the upper end face of the bypass hole 100 to achieve the sealing of the bypass hole 100. The valve body 210 is mounted on the connecting part 222 of the rocker arm 220. The opening and closing of the valve body 210 is achieved by a rotating shaft 221. The rotating shaft 221 passes through the double-layer flow channel turbine housing 01, and its outer end is connected to the end of the pull rod of an external actuator through a pin assembly. The actuator can drive the rocker arm 220 and the valve body 210 mounted on it to rotate, so as to realize the opening and closing of the bypass hole 100.

[0038] The actuator can be a positive pressure driven pneumatic actuator, a negative pressure driven pneumatic actuator, a linear motion electronic actuator, or a rotary motion electronic actuator. When the engine is at low speed, the turbocharger actuator applies a preload force to drive the pin assembly to move the valve assembly 200, so that the upper surface of the valve body 210 contacts the upper end face of the turbine housing bypass hole 100 to achieve exhaust gas sealing. The exhaust gas enters the large flow channel 02 and the small flow channel 03 of the turbine housing respectively. The design of the lower small flow channel 03 of the turbine housing can make full use of the engine pulse energy and improve the engine's low-speed performance.

[0039] At medium engine speed, the actuator drives the pin assembly to open the valve assembly 200 at a small angle according to the control strategy. The rotation of the valve assembly 200 increases the gap between the bottom surface of the valve body 210 and the bottom surface of the turbine housing bypass hole 100. Since the exhaust gas pressure in the small flow channel 03 of the turbine housing is higher than that in the large flow channel 02, some exhaust gas enters the large flow channel 02 from the small flow channel 03, reducing the exhaust gas pressure in the small flow channel 03 and improving the overall turbine efficiency. At the same time, the small angle opening of the valve assembly 200 results in a gap between the upper surface of the valve body 210 and the upper end face of the turbine housing bypass hole 100. This allows a small amount of exhaust gas to bypass to the exhaust end of the turbine housing through the circumferential gap between the valve body 210 and the turbine housing bypass hole 100 (the gap is generally 0.2-0.6 mm, much smaller than the gap between the bottom surface of the valve body 210 and the bottom surface of the bypass hole 100 when the valve assembly 200 is open).

[0040] When the engine is running at high speed, as the opening angle of the turbocharger valve assembly 200 gradually increases, the gap between the bottom surface of the valve body 210 and the upper end surface of the turbine housing bypass hole 100 becomes relatively large. Therefore, more exhaust gas in the large and small flow channels 03 of the turbine housing is directly bypassed to the turbine housing outlet through the bypass hole 100 of the turbine housing, thereby reducing the engine turbine inlet pressure, reducing pumping losses, and improving engine economy.

[0041] Preferably, the valve body 210 includes a connecting post 211 and a sealing part 212. The sealing part 212 has a cylindrical structure, and the connecting post 211 is vertically arranged at the bottom center of the sealing part 212. The connecting post 211 is used to connect the connecting part 222.

[0042] Understandably, the sealing part 212 of the valve body 210 is a cylindrical structure with one end open and the other end closed. The cross-sectional shape of the sealing part 212 matches the shape of the bypass hole 100, and is used to be inserted into the bypass hole 100 for sealing. A connecting post 211 is vertically arranged at the center of the bottom of the sealing part 212. The connecting post 211 is used to connect the valve body 210 and the rocker arm 220. It should be noted that there is a gap between the connecting post 211 and the sealing part 212. This is to provide space so that the sealing part 212 is squeezed inward when it is inserted into the bypass hole 100.

[0043] Preferably, the axis of the rotating shaft 221 is offset from the center of the connecting part 222, the center of the connecting part 222 is located in a through hole for fitting onto the connecting post 211, the connecting part 222 and the connecting post 211 are fixedly connected by a positioning washer 230, and the connection method between the positioning washer 230 and the connecting post 211 is welding.

[0044] Understandably, in order to enable the valve body 210 to close and open the bypass hole 100, in this embodiment, the axis of the rotating shaft 221 is offset from the center of the connecting part 222, and the straight line where the installation position of the rotating shaft 221 is located is also offset from the center of the bypass hole 100. In this way, the entire valve body 210 can be driven to deflect up and down by rotating the rotating shaft 221. In this embodiment, the connecting part 222 is provided with a through hole in the middle, and the connecting post 211 can just extend into the through hole. After extending into the through hole, a positioning gasket 230 is welded to its end. The positioning gasket 230 makes the valve body 210 and the connecting part 222 stably connected together.

[0045] Preferably, the end of the connecting post 211 is provided with a first step 213 for restricting the axial movement of the connecting part 222, and a second step 214 for installing the positioning pad 230.

[0046] Furthermore, two outer diameter shoulders are provided at the end of the connecting post 211, wherein, for example... Figure 1 The lower step 213 in the diagram is the first step, which abuts against the lower end of the connecting part 222. It works with the positioning gasket 230 to fix the valve body 210 to the connecting part 222. The upper second step 214 is for the convenience of positioning and installing the positioning gasket 230.

[0047] Preferably, an elastic gasket 240 is provided between the connecting part 222 and the positioning gasket 230, and the elastic gasket 240 is installed in the mounting groove 241 provided on the upper side of the connecting part 222.

[0048] Furthermore, in this embodiment, an annular mounting groove 241 is provided on the upper side of the connecting part 222. An elastic gasket 240 can be installed in the mounting groove 241. The elastic gasket 240 is located between the upper side of the connecting part 222 and the positioning gasket 230, and the elastic gasket 240 is also sleeved on the circumference of the connecting post 211. The elastic gasket 240 needs to be made of elastic material. The elastic gasket 240 can eliminate the axial gap between the valve body 210, the rocker arm 220, and the positioning gasket 230. In this way, the axial gap in ordinary flat valves is eliminated, thus avoiding vibration noise caused by the axial gap of the valve body 210 and improving the NVH performance of the turbocharger.

[0049] Preferably, the connecting part 222 is provided with an extension part 223 on the side opposite to the mounting groove 241, and the extension part 223 is sleeved on the outer periphery of the connecting post 211 when the connecting part 222 is connected to the connecting post 211.

[0050] Understandably, the connecting part 222 has a downwardly extending extension 223 on its lower side, which surrounds the outer circumference of the connecting part 222 to prevent the connecting column 211 from wobbling radially relative to the connecting part 222 and improve the overall stability of the valve assembly 200.

[0051] Preferably, the upper edge of the sealing part 212 is provided with a flange 215 to increase the sealing effect of the valve body 210.

[0052] Understandably, in order to increase the sealing effect of the valve body 210 on the bypass hole 100, a flange 215 is provided on a circumference of the sealing part 212 in this embodiment. When the valve body 210 seals the bypass hole 100, the flange 215 will fit tightly against the upper end face of the bypass hole 100.

[0053] Preferably, the outer circumference of the rotating shaft 221 is fitted with a bushing, which is connected to the actuator.

[0054] In this embodiment, in order to reduce the wear of the rotating shaft 221 in the valve assembly 200, a bushing is provided on the outer circumference of the rotating shaft 221. The bushing is inserted into the double-layer flow channel vortex shell by interference fit, and the bushing is connected to the external pin assembly by welding.

[0055] Preferably, the valve body 210 is made of high-temperature resistant stainless steel or high-temperature resistant alloy material, and the opening of the sealing part 212 gradually widens.

[0056] Understandably, the valve body 210 is made of high-temperature resistant stainless steel or high-temperature resistant alloy material to prevent high-temperature gas in the bypass hole 100 from damaging the valve body 210; in addition, the lower end of the sealing part 212 is smaller, which facilitates the insertion and removal of the valve body 210.

[0057] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A dual-flow turbocharger with curved valve control, comprising a dual-flow turbine housing (01), characterized in that, It also includes an exhaust gas bypass system, which includes a bypass port (100) and a valve assembly (200), the valve assembly (200) being rotatably disposed in the double-layer flow channel turbine housing (01) so that the valve assembly (200) can seal the bypass port (100). The valve assembly (200) includes: The valve body (210) is configured with a curved surface shape that matches the shape of the bypass hole (100) and is aligned with its center; The rocker arm (220) includes a rotating shaft (221) and a connecting part (222). The rotating shaft (221) passes through the double-layer flow channel turbine housing (01) and is connected to the actuator. The connecting part (222) is fixedly connected to the valve body (210). The valve body (210) includes a connecting column (211) and a sealing part (212). The sealing part (212) has a cylindrical structure. The connecting column (211) is vertically arranged at the bottom center of the sealing part (212). The connecting column (211) is used to connect the connecting part (222).

2. The dual-layer flow channel turbocharger with curved valve control according to claim 1, characterized in that, The axis of the rotating shaft (221) is offset from the center of the connecting part (222). The center of the connecting part (222) is located in a through hole for sleeved on the connecting post (211). The connecting part (222) and the connecting post (211) are fixedly connected by a positioning pad (230), and the positioning pad (230) and the connecting post (211) are connected by welding.

3. The dual-layer flow channel turbocharger with curved valve control according to claim 2, characterized in that, The end of the connecting column (211) is provided with a first step (213) for restricting the axial movement of the connecting part (222) and a second step (214) for installing the positioning pad (230).

4. The dual-layer flow channel turbocharger with curved valve control according to claim 3, characterized in that, An elastic gasket (240) is provided between the connecting part (222) and the positioning gasket (230), and the elastic gasket (240) is installed in the mounting groove (241) provided on the upper side of the connecting part (222).

5. The dual-layer flow channel turbocharger with curved valve control according to claim 4, characterized in that, The connecting part (222) is provided with an extension (223) on the side opposite to the mounting groove (241). The extension (223) is sleeved on the outer periphery of the connecting post (211) when the connecting part (222) is connected to the connecting post (211).

6. The dual-layer flow channel turbocharger with curved valve control according to claim 1, characterized in that, The upper edge of the sealing part (212) is provided with a flange (215) to increase the sealing effect of the valve body (210).

7. The dual-layer flow channel turbocharger with curved valve control according to claim 1, characterized in that, The rotating shaft (221) is fitted with a bushing on its outer circumference, and the bushing is connected to the actuator.

8. The dual-layer flow channel turbocharger with curved valve control according to claim 1, characterized in that, The valve body (210) is made of high-temperature resistant stainless steel or high-temperature resistant alloy material, and the opening of the sealing part (212) gradually widens.

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