Valve device, turbine and supercharger

Abstract

The valve device includes: a valve body; and a valve stem for rotating the valve body about a valve shaft. The valve body includes: a valve seat portion, including a valve seat surface capable of contacting or separating from a communication port that connects a confluence flow path and an exhaust flow path, and capable of opening and closing the communication port; and a valve umbrella portion, protruding from the valve seat portion toward the confluence flow path, and capable of separating two branch flow paths in the confluence flow path. A hollow portion is formed on the radially inner side of the valve seat portion and the valve umbrella portion. The valve stem includes a valve body support portion, which is accommodated in the hollow portion of the valve body, and an annular tilt allowance is formed between the valve stem and the valve body to support the valve body so that it can tilt relative to the valve body support portion. The valve device includes a support member disposed on the tilt allowance and configured to abut against a first surface of the valve body facing the tilt allowance and a second surface of the valve body support portion facing the tilt allowance.

Description

Technical Field

[0001] The present invention relates to a valve device, a turbine having the valve device, and a turbocharger having the turbine. Background Technology

[0002] In a twin-scroll turbine housing, some configurations include: a first branch flow path branching from a first scroll flow path; a second branch flow path branching from a second scroll flow path; and a confluence flow path where the first and second branch flow paths merge, which is connected to an exhaust flow path for the flow of exhaust gas passing through the turbine impeller (see Patent Document 1). Patent Document 1 discloses a valve in its twin-scroll turbine housing, which has a valve body capable of closing a connection between the confluence flow path and the exhaust flow path, and capable of separating the first and second branch flow paths within the confluence flow path.

[0003] Previous technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2019 / 190662 Summary of the Invention

[0006] The technical problem to be solved by the invention

[0007] When the valve body opening is set to a greater than the fully closed intermediate opening, the load pushing the valve body upwards towards the exhaust flow path and the load caused by the lateral force due to the pressure difference between the two branch flow paths act on the valve body. Since the direction of the lateral force load changes over time, the valve body may sometimes be excited laterally (in a direction orthogonal to the axial direction). If the valve body is excited laterally, fretting wear may occur at the contact point between the bottom of the valve body and the valve body support portion, which serves as the valve stem support, and abnormal noise may occur due to collisions between the parts where radial clearances are formed between the valve body and the valve body support portion.

[0008] The invention described in Patent Document 1 discloses a method for suppressing relative movement between the valve body and the valve body support using a spring element, wherein the spring element applies force to the valve body support along the axial direction of the valve body towards the bottom of the valve body. In this spring element, the frictional force of the spring acts as a resistance to loads caused by lateral forces, but it may hinder the tilting of the valve body relative to the valve body support. Furthermore, this spring element may lose its effect of suppressing lateral vibration of the valve body when the spring relaxes.

[0009] In view of the above, the object of at least one embodiment of the present invention is to provide a valve device, a turbine, and a supercharger capable of suppressing collision between the valve body and the valve body support portion supporting the valve body in the tilt margin.

[0010] means for solving technical problems

[0011] At least one embodiment of the present invention relates to a valve device mounted on a turbine housing having two vortex flow paths and rotatably housing a turbine impeller. The two vortex flow paths are used to guide gas to the turbine impeller and are formed in the same region along the axial direction of the turbine.

[0012] The valve device includes:

[0013] A valve body for opening and closing a confluence flow path, wherein the confluence flow path allows two branch flow paths, each branching from the two vortex flow paths, to merge, and is connected via a connecting port to an exhaust flow path supplying gas flow through the turbine impeller; and

[0014] The valve stem is used to rotate the valve body about the valve shaft.

[0015] The valve body includes:

[0016] The valve seat includes a valve seat surface capable of contacting or separating from the communication port, and capable of opening and closing the communication port; and

[0017] The valve umbrella portion protrudes from the valve seat portion toward the confluence flow path, and is capable of separating the two branch flow paths within the confluence flow path.

[0018] A hollow portion is formed on the radially inner side of the valve seat portion and the valve umbrella portion.

[0019] The valve stem includes a valve body support portion, which is accommodated in the hollow portion of the valve body, and has an annular tilting allowance formed between the valve stem and the valve body to support the valve body so that it can tilt relative to the valve body support portion.

[0020] The valve device further includes a support member disposed on the tilt allowance and configured to abut against a first surface of the valve body facing the tilt allowance and a second surface of the valve body support facing the tilt allowance.

[0021] At least one embodiment of the present invention relates to a turbine comprising: the valve device;

[0022] The turbine impeller; and

[0023] The turbine housing.

[0024] The turbocharger according to at least one embodiment of the present invention includes the turbine.

[0025] Invention Effects

[0026] According to at least one embodiment of the present invention, a valve device, a turbine, and a booster are provided that are capable of suppressing collisions between the valve body and the valve body support portion supporting the valve body within a tilt margin. Attached Figure Description

[0027] Figure 1 This is a schematic structural diagram of an internal combustion engine system equipped with a turbocharger according to one embodiment of the present invention.

[0028] Figure 2 This is a schematic cross-sectional view of a turbine according to one embodiment of the present invention, with the cross-section orthogonal to the central axis of the turbine impeller.

[0029] Figure 3 This is a schematic cross-sectional view of a valve device, which is mounted on a turbine housing according to an embodiment of the present invention, and is cut along its central axis.

[0030] Figure 4 This is a schematic cross-sectional view of a valve device according to one embodiment of the present invention, taken along its central axis.

[0031] Figure 5 This is a schematic cross-sectional view of a valve device according to one embodiment of the present invention, taken along its central axis.

[0032] Figure 6 This is a schematic cross-sectional view of a valve device according to one embodiment of the present invention, taken along its central axis.

[0033] Figure 7 This is an explanatory diagram illustrating a support member and a mounting groove for mounting the support member in one embodiment of the present invention.

[0034] Figure 8 This is an explanatory diagram illustrating a support member and a mounting groove for mounting the support member in one embodiment of the present invention.

[0035] Figure 9 This is an explanatory diagram illustrating a support member and a mounting groove for mounting the support member in one embodiment of the present invention.

[0036] Figure 10 This is a schematic cross-sectional view of a valve device according to one embodiment of the present invention, taken along its central axis.

[0037] Figure 11 This is an explanatory diagram illustrating a support member in one embodiment of the present invention.

[0038] Figure 12 This is an explanatory diagram illustrating a support member in one embodiment of the present invention.

[0039] Figure 13 This is a schematic cross-sectional view of a valve device according to one embodiment of the present invention, taken along its central axis.

[0040] Figure 14 This is a schematic cross-sectional view of a valve device according to one embodiment of the present invention, taken along its central axis.

[0041] Figure 15 This is a schematic view taken from one side of the axial direction of the valve device according to one embodiment of the present invention.

[0042] Figure 16 This is a schematic view taken from one side of the axial direction of the valve device according to one embodiment of the present invention.

[0043] Figure 17 This is an explanatory diagram illustrating a support member and a recess for mounting the support member in one embodiment of the present invention.

[0044] Figure 18 This is an explanatory diagram illustrating a support member and a recess for mounting the support member in one embodiment of the present invention. Detailed Implementation

[0045] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the constituent parts described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0046] (Supercharger)

[0047] Figure 1 This is a schematic structural diagram of an internal combustion engine system 1 equipped with a turbocharger 2 according to one embodiment of the present invention. The turbine 21 according to the present invention can be mounted on a turbocharger 2 for automotive, marine, or industrial applications (e.g., land-based power generation). In the following embodiments, a turbine 21 mounted on a turbocharger 2 is used as an example for description, but the turbine 21 according to the present invention is not limited to a turbine mounted on a turbocharger 2. Furthermore, the working fluid of the turbine 21 need not be limited to exhaust gas. That is, the turbine 21 of the present invention can be configured as a single turbine 21 or in combination with a mechanism or device other than a compressor 22, as long as it can convert the energy of the working fluid into mechanical power (e.g., rotational force). Furthermore, the application of the turbine 21 need not be limited.

[0048] like Figure 1As shown, in some embodiments, the turbocharger 2 includes a turbine 21, a compressor 22, and a rotating shaft 23. The turbine 21 includes a turbine impeller 24 mounted on one side of the rotating shaft 23 and a turbine housing 3 configured to rotatably accommodate the turbine impeller 24. The compressor 22 includes an impeller 25 mounted on the other side of the rotating shaft 23 and a compressor housing 26 configured to rotatably accommodate the impeller 25.

[0049] The turbocharger 2 includes a bearing 27 configured to rotatably support a rotating shaft 23 between a turbine impeller 24 and an impeller 25. The turbocharger 2 may include a bearing housing 28 configured to accommodate the bearing 27.

[0050] The turbine 21 is configured to rotate the turbine impeller 24 using the energy from the exhaust gas discharged from the internal combustion engine (engine) 11. The impeller 25 is coaxially connected to the turbine impeller 24 via a rotating shaft 23, and therefore rotates in conjunction with the rotation of the turbine impeller 24. The compressor 22 is configured to draw combustion gas (e.g., air) into its interior by rotating the impeller 25, compress the combustion gas, and guide the compressed combustion gas to the internal combustion engine 11. The combustion gas guided from the compressor 22 to the internal combustion engine 11 is used for combustion in the internal combustion engine 11. The exhaust gas generated by combustion in the internal combustion engine 11 is guided from the internal combustion engine 11 to the turbine 21, causing the turbine impeller 24 to rotate.

[0051] In the illustrated embodiment, the turbine impeller 24 is configured to guide exhaust gas introduced from the radially outer side of the turbine impeller 24 along the axial direction of the turbine impeller 24. The impeller 25 is configured to guide combustion gas introduced along the axial direction of the impeller 25 to the radially outer side of the impeller 25.

[0052] (Turbine casing)

[0053] Figure 2 This is a schematic cross-sectional view of a section of a turbine 21 orthogonal to the central axis LA of a turbine impeller 24 according to one embodiment of the present invention. Figure 3 This is a schematic cross-sectional view showing a section taken along the central axis LB of the valve device 4, which is mounted on the turbine housing 3 according to one embodiment of the present invention. Hereinafter, the direction in which the central axis LA of the turbine impeller 24 extends when the turbine housing 3 houses the turbine impeller 24 is defined as the axial direction of the turbine impeller 24 (turbine 21). The direction in which the central axis LB of the valve body 5 of the valve device 4, which is housed in the turbine housing 3, extends is defined as the axial direction of the valve body 5 (valve device 4).

[0054] like Figure 2 As shown, the turbine housing 3 includes a vortex flow path forming portion 31 that forms a first vortex flow path 311 and a second vortex flow path 312. Figure 3As shown, the turbine housing 3 includes a connecting flow path forming portion 32 forming a connecting flow path 320, which includes a first branch flow path 321, a second branch flow path 322, and a confluence flow path 323. Inside the turbine housing 3 are formed a first vortex flow path 311, a second vortex flow path 312, the connecting flow path 320, and an exhaust flow path 331 for the flow of exhaust gas passing through the turbine impeller 24. The turbine housing 3 is made of metallic material.

[0055] (First vortex flow path, second vortex flow path)

[0056] like Figure 2 As shown, the first vortex flow path 311 and the second vortex flow path 312 are flow paths used to guide exhaust gas into the nozzle flow path 34 of the turbine housing 3. The nozzle flow path 34 is located downstream of the exhaust gas flow path from the internal combustion engine 11, further downstream than the first vortex flow path 311 and the second vortex flow path 312. The nozzle flow path 34 is formed by an annular space formed inside the turbine housing 3 and radially outward of the turbine impeller 24. The first vortex flow path 311 and the second vortex flow path 312 are each formed by a vortex flow path located radially outward of the nozzle flow path 34 and extending circumferentially around the central axis LA.

[0057] The second vortex flow path 312 is formed in the same region along the axial direction of the turbine 21 as the first vortex flow path 311. Furthermore, "the same region along the axial direction of the turbine 21" means, as... Figure 2 As shown, the vortex shapes of the first vortex flow path 311 and the second vortex flow path 312 are displayed together on a cross section orthogonal to the central axis LA of the turbine impeller 24.

[0058] like Figure 2 As shown, the turbine housing 3 is configured such that the first range CR1 of the nozzle flow path 34 for introducing exhaust gas flowing through the first vortex flow path 311 and the second range CR2 of the nozzle flow path 34 for introducing exhaust gas flowing through the second vortex flow path 312 do not overlap in the circumferential direction around the central axis LA of the turbine impeller 24. In the illustrated embodiment, the second vortex flow path 312 is positioned on a section orthogonal to the central axis LA of the turbine impeller 24 at a position further outward (radially outward) than the first vortex flow path 311, and the first vortex flow path 311 and the second vortex flow path 312 overlap at least partially in the circumferential direction of the turbine impeller 24. Alternatively, the first vortex flow path 311 and the second vortex flow path 312 may also be configured not to overlap in the circumferential direction of the turbine impeller 24.

[0059] The exhaust gas discharged from the internal combustion engine 11 and guided to the turbine 21 flows through the first vortex flow path 311 or the second vortex flow path 312, and is guided to the turbine impeller 24 through the nozzle flow path 34. The exhaust gas guided to the turbine impeller 24 is discharged to the outside of the turbine 21 through the exhaust flow path 331.

[0060] (First branch flow path, second branch flow path, merging flow path)

[0061] like Figure 3 As shown, the first branch flow path 321 is a flow path branching from the first vortex flow path 311. One end of the first branch flow path 321 is connected to the first vortex flow path 311 in a manner that allows exhaust gas to flow, and the other end is connected to the confluence flow path 323 in a manner that allows exhaust gas to flow. The second branch flow path 322 is a flow path branching from the second vortex flow path 312. (The text repeats itself here.) Figure 3 As shown, one end of the second branch flow path 322 is connected to the second vortex flow path 312 in a manner that allows exhaust gas to flow, and the other end is connected to the confluence flow path 323 in a manner that allows exhaust gas to flow. In the confluence flow path 323, the first branch flow path 321 and the second branch flow path 322 merge. The confluence flow path 323 is connected to the exhaust flow path 331 via the connecting port 332. Thus, the first branch flow path 321 and the second branch flow path 322 are respectively connected to another branch flow path 322, 321 and the exhaust flow path 331 via the confluence flow path 323 in a manner that allows exhaust gas to flow.

[0062] (Valve device)

[0063] like Figure 3 As shown, in some embodiments, the turbine 21 includes a valve device 4 mounted on the turbine housing 3. The valve device 4 includes a valve body 5 for opening and closing the aforementioned confluence flow path 323 and a valve stem 6 for rotating the valve body 5 about a valve shaft LC. The valve shaft LC is formed by the central axis of the valve stem 6.

[0064] (Valve body)

[0065] The valve body 5 includes a valve seat portion 51 and a valve umbrella portion 52. The valve seat portion 51 includes a valve seat surface 511 that can contact or separate from the communication port 332, and is configured to open and close the communication port 332. In the illustrated embodiment, the valve seat portion 51 has an annular plate shape including a valve seat surface 511 extending in a direction orthogonal to the central axis LB of the valve body 5 (valve device 4). The valve umbrella portion 52 protrudes from the valve seat portion 51 toward the confluence flow path 323. The valve umbrella portion 52 is configured to separate two branch flow paths (first branch flow path 321, second branch flow path 322) in the confluence flow path 323. The valve umbrella portion 52 has a convex shape that protrudes toward the direction of the valve seat surface 511 in the extension direction away from the central axis LB of the valve body 5 (towards the confluence flow path 323). In the valve body 5, a hollow portion 53 is formed radially inside the valve seat portion 51 and the valve umbrella portion 52.

[0066] The valve device 4 is configured to adjust the opening degree of the valve body 5. Specifically, the valve device 4 also includes a rotary drive device, which includes an actuator (not shown) for rotating the valve stem 6 about the valve shaft LC. By rotating the valve stem 6 and the valve body 5 connected to the valve stem 6 about the valve shaft LC, the valve device 4 can adjust the opening degree of the valve body 5 to an opening degree corresponding to the circumferential angular position of the valve shaft LC. The valve device 4 is configured to adjust the opening degree of the valve body 5 to at least one intermediate opening degree between fully open, fully closed, and fully open and fully closed.

[0067] The second vortex flow path 312 is connected to a cylinder that is different from the cylinder connected to the first vortex flow path 311. The exhaust pulsations of the cylinder connected to the first vortex flow path 311 and the cylinder connected to the second vortex flow path 312 are phase-shifted. In the extremely low speed range and low speed range of the internal combustion engine 11, the total amount of exhaust gas discharged from the internal combustion engine 11 can be guided to the nozzle flow path 34 through either the first vortex flow path 311 or the second vortex flow path 312, thus the valve body 5 is fully closed. When the valve body 5 is fully closed, the valve umbrella portion 52 of the valve body 5 blocks the confluence flow path 323, and the gap between the valve umbrella portion 52 and the confluence flow path 323 narrows, thus the SCV flow, i.e., the flow from either the first branch flow path 321 or the second branch flow path 322 towards the other, is suppressed. Furthermore, when the valve body 5 is fully closed, the valve seat surface 511 of the valve body 5 abuts against the valve seat contact surface 324 of the connecting flow path forming part 32. The valve seat contact surface 324 is a surface connected to the connecting port 332 and extending along a direction orthogonal to the central axis LD of the connecting port 332, and is the surface facing the exhaust flow path 331. By abutting the valve seat surface 511 against the valve seat contact surface 324, the confluence flow path 323 and the exhaust flow path 331 are sealed off, thus suppressing the bypass flow (WG flow) of exhaust gas that bypasses the turbine impeller 24 and is introduced from the confluence flow path 323 into the exhaust flow path 331.

[0068] In the mid-speed range of the internal combustion engine 11, the flow rate of exhaust gas discharged from the internal combustion engine 11 is increased compared to the low-speed range. It is difficult to guide the total amount of exhaust gas discharged from the internal combustion engine 11 to the nozzle flow path 34 using only either the first vortex flow path 311 or the second vortex flow path 312. Therefore, the valve body 5 is set to a first intermediate opening larger than fully closed, generating the aforementioned SCV flow, which delivers the remaining exhaust gas from one of the first vortex flow path 311 or the second vortex flow path 312 to the other.

[0069] In the high-speed range of the internal combustion engine 11, even with increased SCV flow, it is difficult to guide the total amount of exhaust gas discharged from the internal combustion engine 11 to the nozzle flow path 34 in the first vortex flow path 311 and the second vortex flow path 312. Therefore, by setting the valve body 5 opening to a second intermediate opening larger than the first intermediate opening or fully open, the aforementioned bypass flow is increased, and the remaining exhaust gas is delivered from the first vortex flow path 311 or the second vortex flow path 312 to the exhaust flow path 331. In addition, when the valve body 5 opening is set to the first intermediate opening, a small amount of bypass flow can be generated.

[0070] (Valve stem)

[0071] Figures 4-6 These are schematic cross-sectional views of the valve device 4 according to one embodiment of the present invention, taken along the central axis LB. Figures 4-6 As shown, the valve stem 6 includes a valve body support portion 61 housed in the hollow portion 53 of the valve body 5. The valve body support portion 61 is connected to the valve shaft main body portion 60 having a valve shaft LC and is capable of rotating together with the valve shaft main body portion 60 about the valve shaft LC. The valve body support portion 61 is formed as a cylindrical shape extending along the axial direction of the valve body 5.

[0072] (Inclination allowance, first side, second side)

[0073] In order for the valve device 4 to function as a valve for suppressing the flow of SCV and the flow of WG, the valve body 5 needs to be tiltable relative to the valve body support 61 so that when the valve body 5 is fully closed, the valve seat surface 511 can be in close contact with the valve seat abutment surface 324. The valve body support 61 has an inclination allowance 62 between itself and the valve body 5 to support the valve body 5 so that it can tilt relative to the valve body support 61. The inclination allowance 62 is an annular gap extending circumferentially along the central axis LB of the valve body 5. The valve body 5 has a first surface 54 facing the inclination allowance 62. The valve body support 61 has a second surface 63 facing the inclination allowance 62. The second surface 63 and the first surface 54 are opposed to each other by the inclination allowance 62, which is a radial gap.

[0074] like Figures 4-6 As shown, the valve body 5 includes a bottom 521 facing the valve umbrella portion 52 from the hollow portion 53 toward a direction away from the confluence flow path 323. Figures 4-6 A central rod portion 55 extends from the lower side (the side where the valve seat portion 51 is located in the axial direction). The central rod portion 55 extends along the axial direction of the valve body 5 and loosely inserts into the valve body support portion 61. An annular radial gap 62B is formed between the outer peripheral surface 552 of the central rod portion 55 and the inner peripheral surface 613 of the valve body support portion 61.

[0075] like Figures 4-6As shown, the valve body support portion 61 includes a flange portion 64, which extends further outward in the radial direction than the other portions of the valve body support portion 61. The outer peripheral surface 641 of the flange portion 64 forms an annular radial gap 62A between it and the inner peripheral surfaces 512 and 523 of the valve seat portion 51 and the valve umbrella portion 52.

[0076] (Anti-fall-off components)

[0077] The valve device 4 includes an annular anti-detachment component 8 installed on the outer periphery of the protrusion 551 that protrudes from the valve body support portion 61 of the central rod portion 55. The anti-detachment component 8 is fixed to the small-diameter portion formed in the protrusion 551 by welding, riveting, or the like. By fixing the anti-detachment component 8 to the protrusion 551, the axial movement of the valve body 5 of the valve body support portion 61 is restricted, thereby preventing the valve body support portion 61 from detaching from the central rod portion 55.

[0078] When the opening of valve body 5 is set to be greater than the first intermediate opening of fully closed, a load F1 pushing valve body 5 upward toward the exhaust flow path 331 and a load F2 caused by the lateral force due to the pressure difference generated between the two branch flow paths 321 and 322 act on valve body 5. Since the direction of the load F2 caused by the lateral force changes over time, valve body 5 may sometimes be excited in the lateral direction (orthogonal to the axial direction). If valve body 5 is excited in the lateral direction, fretting wear may occur at the contact point between the bottom 521 of valve body 5 and valve body support 61, and the parts where radial gaps 62A and 62B are formed between valve body 5 and valve body support 61 may collide with each other, producing abnormal noise.

[0079] (Supporting components)

[0080] like Figures 4-6 As shown, the valve device 4 includes a support member 7 disposed on the tilt allowance 62. The support member 7 is configured to abut against a first surface 54 facing the tilt allowance 62 of the valve body 5 and a second surface 63 facing the tilt allowance 62 of the valve body support portion 61. The support member 7 is configured to abut against both the first surface 54 and the second surface 63, but this is not limited to the case where the support member 7 abuts against both the first surface 54 and the second surface 63. It also includes the case where the support member 7 has a relatively small gap (smaller than the radial gaps 62A and 62B) between it and the first surface 54 or the second surface 63, and abuts against both the first surface 54 and the second surface 63 when a load F2 caused by a lateral force is applied. In this case, the load F2 caused by the lateral force can be supported by the support member 7 disposed on the tilt allowance 62, thereby effectively suppressing the relative movement of the valve body 5 and the valve body support portion 61 in the lateral direction (orthogonal to the axial direction). Therefore, collisions in radial clearances 62A and 62B, such as the tilt margin 62 of the valve body 5 and the valve body support 61 supporting the valve body 5, can be suppressed.

[0081] exist Figure 4 and Figure 6 In the illustrated embodiment, the tilt allowance 62 of the support member 7 is the radial clearance 62A. The first surface 54 is the inner peripheral surface 512, 523 of the valve seat portion 51 or the valve umbrella portion 52 (inner peripheral surface 512 in the illustrated example), and the second surface 63 is the outer peripheral surface 641 of the flange portion 64. The load F2 caused by the lateral force acts on the valve seat portion 51 and the valve umbrella portion 52 (especially the valve umbrella portion 52) of the valve body 5. Therefore, by arranging the support member 7 between the inner peripheral surface 512, 523 of the valve seat portion 51 or the valve umbrella portion 52, which is subjected to the load F2 caused by the lateral force, and the outer peripheral surface 641 of the flange portion 64, the load F2 caused by the lateral force can be quickly supported by the support member 7.

[0082] exist Figure 5 In the illustrated embodiment, the tilt allowance 62 of the support member 7 is the radial clearance 62B. The first surface 54 is the outer peripheral surface 552 of the middle rod portion 55, and the second surface 63 is the inner peripheral surface 613 of the valve body support portion 61. Compared to the case where it is disposed in the radial clearance 62A, the support member 7 disposed in the radial clearance 62B can be made relatively smaller.

[0083] exist Figure 4 and Figure 5 In the embodiment shown, the bottom surface 522 of the bottom 521 of the valve umbrella portion 52 and the end surface 612 of one axial end 611 of the valve body support portion 61 that abuts against the bottom surface 522 respectively have a direction that moves away from the confluence flow path 323 (in Figures 4-6 The inclined surfaces (located on the lower side, axially above the valve seat portion 51) have a larger radial distance from the central axis LB. These inclined surfaces can be curved surfaces with a specified radius of curvature. By equipping the valve device 4 with these inclined surfaces, it becomes easier to tilt the valve body 5 relative to the valve body support portion 61. Furthermore, as... Figure 6 As shown, the bottom surface 522A of the bottom 521 of the valve umbrella portion 52 and the end surface 612A of one axial end 611 of the valve body support portion 61 that abuts against the bottom surface 522A can each have a flat surface extending in a direction orthogonal to the axial direction of the valve body 5.

[0084] (Metal O-ring)

[0085] Figures 7-9 These are explanatory diagrams illustrating a support member 7 and a mounting groove for mounting the support member 7 in one embodiment of the present invention. In some embodiments, such as Figures 4-9As shown, a mounting groove 41 extending circumferentially is formed on the first surface 54 or the second surface 63. A support member 7 extends circumferentially and is mounted in the mounting groove 41. A portion of the support member 7 protrudes outward from the mounting groove 41. By mounting the support member 7 in the mounting groove 41, the support member 7 can be supported by the valve body 5 or the valve body support portion 61, thus improving the assemblability of the valve device 4 compared to the case where the mounting groove 41 is not formed on the first surface 54 or the second surface 63.

[0086] exist Figure 4 and Figure 6 In the embodiment shown, the mounting groove 41 is an annular groove formed on the outer peripheral surface 641 of the flange portion 64, which serves as the second surface 63, and extending circumferentially. Figure 5 In the embodiment shown, the mounting groove 41 is an annular groove formed on the outer peripheral surface 552 of the middle rod portion 55, which is the first surface 54, and extending in the circumferential direction. Alternatively, the mounting groove 41 may be formed on the inner peripheral surfaces 512 and 523 of the valve seat portion 51 or the valve umbrella portion 52, or on the inner peripheral surface 613 of the valve body support portion 61.

[0087] exist Figures 4-9 In the illustrated embodiment, the support member 7 is an endless annular member (metal O-ring) 71 extending circumferentially. The annular member 71 is made of metal, and its cross-section along the axial direction of the valve body 5 (the cross-section of the annular member 71) is circular or elliptical. By setting the axial cross-section of the annular member 71 (support member 7) to be circular or elliptical, and setting the contact portion of the support member 7 with the first surface 54 or the second surface 63 to be line contact, it is possible to reduce malfunctions caused by shape mismatch between the support member 7 and the first surface 54 or the second surface 63, thereby suppressing the support member 7 from obstructing the tilt of the valve body 5 relative to the valve body support portion 61.

[0088] exist Figures 4-7 In the embodiment shown, the mounting groove 41 is a rectangular groove that includes a bottom surface 411 extending along the axial direction of the valve body 5, a first groove wall surface 412 extending radially outward from one end of the bottom surface 411 along the axial direction, and a second groove wall surface 413 extending radially outward from the other end of the bottom surface 411 along the axial direction.

[0089] exist Figure 8 and Figure 9In the illustrated embodiment, the cross-section of the mounting groove 41 along the axial direction of the valve body 5 (the cross-section of the mounting groove 41) is V-shaped. Specifically, the mounting groove 41 includes a first groove inclined surface 414 whose groove depth increases towards one side (lower side in the figure) toward the axial direction of the valve body 5, and a second groove inclined surface 415 whose groove depth increases towards the other side (upper side in the figure) toward the axial direction of the valve body 5. The second groove inclined surface 415 is formed on the aforementioned side (lower side in the figure) that is closer to the axial direction of the valve body 5 than the first groove inclined surface 414. By making the axial cross-section of the mounting groove 41 V-shaped, the insertion operation of the support member 7 into the mounting groove 41 can be simplified compared to the case where the cross-section is rectangular.

[0090] exist Figure 9 In the illustrated embodiment, the surface 641 on which the mounting groove 41 is formed includes a conical surface 641A, which is inclined in such a way that the inclination allowance 62 increases as it moves axially away from the edge 416 of the mounting groove 41. Inclining in such a way that the inclination allowance 62 increases means that the radial distance of the conical surface 641A from the central axis LB decreases. By providing the conical surface 641A on the surface 641 on which the mounting groove 41 is formed, the support member 7 can be slidably mounted in the mounting groove 41 along the conical surface 641A. Therefore, compared to the case where the conical surface 641A is not provided, the insertion operation of the support member 7 into the mounting groove 41 can be simplified. The conical surface 641A is formed on the upstream side (lower side in the figure) of the mounting direction of the support member 7, which is further upstream than the mounting groove 41.

[0091] (Example of a modified support component)

[0092] Figure 10 This is a schematic cross-sectional view of the valve device 4 according to one embodiment of the present invention, cut along the central axis LB. Figure 11 and Figure 12 These are explanatory diagrams illustrating the support member 7 in one embodiment of the present invention. Figures 10-12 In the illustrated embodiment, the support member 7 is an arc-shaped member 72 extending circumferentially from one arc end 721 to the other arc end 722. Figure 10 In the embodiment shown, the cross section of the arc-shaped component 72 cut along the axial direction of the valve body 5 (the cross section of the arc-shaped component 72) is formed into a rectangular shape and is installed in the mounting groove 41.

[0093] exist Figure 11 In the embodiment shown, the winding angle θ of the arc-shaped component 72 (reference) Figure 12 The circumferential angle from one arc end 721 to the other arc end 722 is less than 360°, and an opening 723 is formed between one arc end 721 and the other arc end 722. The winding angle θ of the arc-shaped component 72 is preferably 330° or more and less than 360°.

[0094] like Figure 12 As shown, the winding angle θ of the arc-shaped component 72 can be greater than 360°. Figure 12 In the embodiment shown, the arc-shaped component 72 is a double loop whose winding angle θ satisfies the condition of 720°±10°.

[0095] (Sealing components)

[0096] Figure 13 This is a schematic cross-sectional view of the valve device 4 according to one embodiment of the present invention, taken along the central axis LB. Figure 13 In the illustrated embodiment, the support member 7 is a sealing member 73. The sealing member 73 is configured to contact the first surface 54 and the second surface 63 respectively, and is configured to be able to extend and retract radially along the valve body 5. At this time, since the sealing member 73 can be flexed when the valve body 5 is tilted relative to the valve body support portion 61, it is possible to prevent the sealing member 73 from hindering the tilting of the valve body 5 relative to the valve body support portion 61.

[0097] like Figure 13 As shown, the sealing member 73 has a U-shaped or V-shaped cross-section along the axial direction of the valve body 5, with an opening on one side in the axial direction. The sealing member 73 includes: a side portion 731 that abuts against the first surface 54; a side portion 732 that abuts against the second surface 63; and a connecting portion 733 that connects one axial end of the side portion 731 to one axial end of the side portion 732. At this time, since the sealing member 73 can bend relatively much in the radial direction of the valve body 5 when the valve body 5 is tilted relative to the valve body support portion 61, it is possible to effectively suppress the sealing member 73 from hindering the tilting of the valve body 5 relative to the valve body support portion 61.

[0098] (Spheroid)

[0099] Figure 14 This is a schematic cross-sectional view of the valve device 4 according to one embodiment of the present invention, cut along the central axis LB. Figure 15 and Figure 16 These are schematic diagrams viewed from one side of the axial direction of valve device 4. Figure 17 and Figure 18 This is an explanatory diagram illustrating a support member 7 and a recess 42 for mounting the support member 7 in one embodiment of the present invention. Figures 14-17 In the embodiment shown, the sealing member 73 is a plurality of spherical bodies 74 disposed on the inclined allowance 62. The plurality of spherical bodies 74 are arranged at intervals in the circumferential direction of the valve body 5.

[0100] exist Figure 14 and Figure 15 In the illustrated embodiment, a plurality of spherical bodies 74 are respectively mounted in the mounting groove 41. Figure 14 and Figure 15 In the embodiment shown, the circumferential displacement of the spheres 74 is suppressed by installing a retainer (cage) 75 between two spheres 74 arranged adjacent to each other in the circumferential direction in the mounting groove 41.

[0101] exist Figures 16-18 In the illustrated embodiment, a plurality of recesses 42 for mounting the spherical bodies 74 are formed on the first surface 54 or the second surface 63 (the outer peripheral surface 641 of the flange 64 in the example). The plurality of recesses 42 are formed at intervals in the circumferential direction of the valve body 5. The plurality of spherical bodies 74 are respectively mounted in the corresponding recesses 42, thereby suppressing the positional displacement of the spherical bodies 74 in the circumferential direction.

[0102] By setting the support member 7 as a spherical body 74 installed in the mounting groove 41 or the recess 42, and setting the contact portion of the support member 7 with respect to the first surface 54 or the second surface 63 as point contact, it is possible to reduce malfunctions caused by the shape mismatch of the support member 7 with respect to the first surface 54 or the second surface 63, thereby effectively suppressing the support member 7 from hindering the tilt of the valve body 5 relative to the valve body support portion 61.

[0103] In some implementations, such as Figure 17 and Figure 18 As shown, the recess 42 has a length direction along the axial direction of the valve body 5. The recess 42 is configured to allow the spherical body 74 mounted in the recess 42 to roll along the axial direction of the valve body 5. Figure 17 As shown, when the diameter of the spherical body 74 is defined as D, and the axial length of the spherical body 74 in the recess 42 that allows it to roll is defined as L, the axial length L preferably satisfies the condition 1.5×D≤L≤2×D. By enabling the spherical body 74 to roll along the axial direction of the valve body 5 within the recess 42, the inclination of the support member 7 relative to the valve body support 61 can be effectively suppressed.

[0104] In some embodiments, the turbine 21 includes the aforementioned valve device 4, turbine impeller 24, and turbine housing 3. In some embodiments, the turbocharger 2 includes the aforementioned turbine 21. The turbine 21 and turbocharger 2, which include the valve device 4, can suppress the collision between the valve body 5 and the valve body support 61 supporting the valve body 5 within the tilt margin 62, thereby suppressing the generation of abnormal noise caused by the collision.

[0105] In this specification, expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" that indicate relative or absolute configuration not only strictly indicate such configuration, but also indicate the state of relative displacement of angle or distance with tolerance or to the extent that the same function can be obtained.

[0106] For example, expressions such as "same," "equal," and "homogeneous" that indicate things are in the same state not only mean that they are the same in a strict sense, but also that there are differences in the degree to which they can achieve the same function.

[0107] Furthermore, in this specification, the description of shapes such as quadrilaterals or cylinders refers not only to shapes such as quadrilaterals or cylinders in a strict geometric sense, but also to shapes such as concave or convex parts or chamfered parts within the range where the same effect can be obtained.

[0108] Furthermore, in this specification, expressions such as "possessing," "including," or "having" a constituent element are not exclusive expressions that exclude the existence of other constituent elements.

[0109] The present invention is not limited to the embodiments described above, but also includes modifications to the embodiments described above or appropriate combinations thereof. For example, the support member 7 other than the annular member 71 may be disposed in the radial gap 62B.

[0110] The contents described in some of the above embodiments are as follows.

[0111] 1) In at least one embodiment of the present invention, a valve device (4) is mounted on a turbine housing (3), the turbine housing (3) having two vortex flow paths (311, 312) and rotatably accommodating a turbine impeller (24), the two vortex flow paths (311, 312) being used to guide gas to the turbine impeller (24) and forming in the same region along the axial direction of the turbine (21).

[0112] The valve device (4) includes:

[0113] Valve body (5) for opening and closing the confluence flow path (323), the confluence flow path (323) for merging two branch flow paths (321, 322) branching from the two vortex flow paths (311, 312) respectively, and connected via a connecting port (332) to an exhaust flow path (331) for gas flow through the turbine impeller (24); and

[0114] The valve stem (6) is used to rotate the valve body (5) about the valve shaft.

[0115] The valve body (5) includes:

[0116] The valve seat portion (51) includes a valve seat surface (511) capable of contacting or separating from the communication port (332), and capable of opening and closing the communication port (332); and

[0117] The valve umbrella part (52) protrudes from the valve seat part (51) toward the confluence flow path (323) and can separate the two branch flow paths (321, 322) in the confluence flow path (323).

[0118] A hollow portion (53) is formed on the radially inner side of the valve seat portion (51) and the valve umbrella portion (52).

[0119] The valve stem (6) includes a valve body support (61) which is housed in the hollow portion (53) of the valve body (5) and has an annular tilt allowance (62) between it and the valve body (5) for supporting the valve body (5) so that it can tilt relative to the valve body support (61).

[0120] The valve device (4) also includes a support member (7) disposed on the tilt allowance (62) and configured to abut against the first surface (54) of the valve body (5) facing the tilt allowance (62) and the second surface (63) of the valve body support (61) facing the tilt allowance (62).

[0121] According to the structure described in 1), the load (F2) caused by the lateral force due to the pressure difference between the two branch flow paths (321, 322) can be supported by the support member (7) located in the tilt margin (62), thereby effectively suppressing the relative movement of the valve body (5) and the valve body support (61) in the lateral direction (orthogonal to the axial direction). As a result, collisions between the valve body (5) and the valve body support (61) supporting the valve body (5) in the radial clearance such as the tilt margin (62) can be suppressed.

[0122] 2) In some embodiments, according to the valve device (4) described in 1) above, wherein,

[0123] A mounting groove (41) extending circumferentially is formed on the first surface (54) or the second surface (63).

[0124] The support member (7) extends along the circumferential direction and is mounted in the mounting groove (41).

[0125] According to the structure of 2) above, by installing the support member (7) in the mounting groove (41), the support member (7) can be supported by the valve body (5) or the valve body support (61). Therefore, compared with the case where the mounting groove (41) is not formed on the first surface (54) or the second surface (63), the assemblability of the valve device (4) can be improved.

[0126] 3) In some embodiments, according to the valve device (4) described in 2) above, wherein,

[0127] The support member (7) is an annular member (71) extending along the circumferential direction.

[0128] The surface (641) on which the mounting groove (41) is formed includes a conical surface (641A) that is inclined in such a way that the tilt allowance (62) increases as it moves axially away from the edge (416) of the mounting groove (41).

[0129] According to the structure described in 3), by providing a conical surface (641A) on the surface (641) where the mounting groove (41) is formed, the support member (7) can be installed in the mounting groove (41) by sliding along the conical surface (641A). Therefore, compared with the case where the conical surface (641A) is not provided, the insertion operation of the support member (7) into the mounting groove (41) can be simplified.

[0130] 4) In some embodiments, the valve device (4) according to 2) or 3) above, wherein,

[0131] The axial cross-section of the support components (7, 71) is circular or elliptical.

[0132] According to the structure of 4) above, by setting the axial cross section of the support member (7, 71) to be circular or elliptical, and setting the contact part of the support member (7) with respect to the first surface (54) or the second surface (63) to be line contact, it is possible to reduce the malfunction caused by the shape mismatch of the support member (7) with respect to the first surface (54) or the second surface (63), thereby suppressing the support member (7) from hindering the tilt of the valve body (5) with respect to the valve body support part (61).

[0133] 5) In some embodiments, the valve device (4) according to 2) or 3) above, wherein,

[0134] The mounting groove (41) has a V-shaped cross section along the axial direction.

[0135] Based on the structure of 5) above, by setting the axial cross section of the mounting groove (41) to V-shape, compared with the case where the cross section is rectangular, the insertion operation of the support component (7) into the mounting groove (41) can be simplified.

[0136] 6) In some embodiments, according to the valve device (4) described in 1) above, wherein,

[0137] The support member (7) includes a sealing member (73) configured to contact the first surface (54) and the second surface (63) respectively, and is configured to be radially expandable and contractile.

[0138] According to the structure of 6) above, since the sealing member (73) can be deflected when the valve body (5) is tilted relative to the valve body support (61), the sealing member (73) can be suppressed from hindering the tilting of the valve body (5) relative to the valve body support (61).

[0139] 7) In some embodiments, according to the valve device (4) described in 6) above, wherein,

[0140] The sealing component (73) has an axial cross-section that is U-shaped or V-shaped with an opening on one side of the axial direction.

[0141] According to the structure of 7) above, since the sealing member (73) can bend relatively much in the radial direction of the valve body (5) when the valve body (5) is tilted relative to the valve body support (61), the sealing member (73) can effectively suppress the sealing member (73) from hindering the tilting of the valve body (5) relative to the valve body support (61).

[0142] 8) In some embodiments, according to the valve device (4) described in 1) above, wherein,

[0143] The support member (7) includes a plurality of spherical bodies (74) arranged at intervals in the circumferential direction of the tilt margin (62).

[0144] A recess (42) for mounting the sphere (74) is formed on the first surface (54) or the second surface (63).

[0145] According to the structure of 8) above, by setting the support member (7) as a spherical body (74) installed in the recess (42) and setting the contact part of the support member (7) with respect to the first surface (54) or the second surface (63) as a point contact, it is possible to reduce the malfunction caused by the shape mismatch of the support member (7) with respect to the first surface (54) or the second surface (63), thereby effectively suppressing the support member (7) from hindering the tilt of the valve body (5) relative to the valve body support part (61).

[0146] 9) In some embodiments, according to the valve device (4) described in 8) above, wherein,

[0147] The recess (42) has a length direction along the axial direction and is configured to allow the spherical body (74) mounted in the recess (42) to roll along the axial direction.

[0148] According to the structure of 9) above, by enabling the spherical body (74) to roll axially within the recess (42), the support member (7) can be effectively suppressed from hindering the tilt of the valve body (5) relative to the valve body support (61).

[0149] 10) In some embodiments, the valve device (4) according to any one of 1) to 9) above, wherein,

[0150] The valve body (5) includes a central rod portion (55) that extends from the bottom (521) of the valve umbrella portion (52) toward a direction away from the confluence flow path (323).

[0151] The valve body support portion (61) includes a flange portion (64) extending radially outward.

[0152] The first surface (54) is the inner circumferential surface (512, 523) of the valve seat portion (51) or the valve umbrella portion (52).

[0153] The second surface (63) is the outer peripheral surface (641) of the flange portion (64).

[0154] According to the structure of 10) above, the load (F2) caused by the lateral force due to the pressure difference generated between the two branch flow paths (321, 322) acts on the valve seat (51) and valve umbrella (52) of the valve body (5). Therefore, by arranging a support member (7) between the inner peripheral surface (512, 523) of the valve seat (51) or valve umbrella (52) where the load (F2) caused by the lateral force acts and the outer peripheral surface (641) of the flange (64), the load (F2) caused by the lateral force can be quickly supported by the support member (7).

[0155] 11) In some embodiments, the valve device (4) according to any one of 1) to 9) above, wherein,

[0156] The valve body (5) includes a central rod portion (55) that extends from the bottom (521) of the valve umbrella portion (52) toward a direction away from the confluence flow path (323).

[0157] The first surface (54) is the outer peripheral surface (552) of the middle rod portion (55).

[0158] The second surface (63) is the inner circumferential surface (613) of the valve body support (61).

[0159] According to the structure of 11) above, the support member (7) disposed between the outer peripheral surface (552) of the middle rod part (55) and the inner peripheral surface (613) of the valve body support part (61) can be made relatively small in size.

[0160] 12) The turbine (21) according to at least one embodiment of the present invention comprises:

[0161] Valve device (4) as described in any one of 1) to 11) above;

[0162] The turbine impeller (24); and

[0163] The turbine housing (3).

[0164] According to the structure of 12) above, the turbine (21) equipped with the valve device (4) can suppress the collision between the valve body (5) and the valve body support (61) supporting the valve body (5) in the tilt margin (62), and thus can suppress the generation of abnormal sound caused by the collision.

[0165] 13) The turbocharger (2) according to at least one embodiment of the present invention includes the turbine (21) described in 12) above.

[0166] According to the structure of 13) above, the booster (2) equipped with the valve device (4) can suppress the collision between the valve body (5) and the valve body support (61) supporting the valve body (5) in the tilt margin (62), and thus can suppress the generation of abnormal sound caused by the collision.

[0167] Symbol Explanation

[0168] 1-Internal combustion engine system, 2-Turbocharger, 3-Turbine housing, 4-Valve assembly, 5-Valve body, 6-Valve stem, 7-Support component, 8-Anti-detachment component, 11-Internal combustion engine, 21-Turbine, 22-Compressor, 23-Rotating shaft, 24-Turbine impeller, 25-Impeller, 26-Compressor housing, 27-Bearing, 28-Bearing housing, 31-Vortex flow path forming part, 32-Connecting flow path forming part, 34-Nozzle flow path, 41-Mounting groove, 42-Recess, 51-Valve seat part, 52-Valve umbrella part, 5 3-Hollow section, 54-First surface, 55-Middle rod section, 60-Valve shaft main body section, 61-Valve body support section, 62-Inclined allowance, 62A, 62B-Radial clearance, 63-Second surface, 64-Flange section, 71-Annular component, 72-Arc-shaped component, 73-Sealing component, 74-Spherical body, 311-First vortex flow path, 312-Second vortex flow path, 321-First branch flow path, 322-Second branch flow path, 323-Merging flow path, 331-Exhaust flow path, 332-Connecting port.

Claims

1. A valve device mounted on a turbine housing having two vortex flow paths and rotatably housing a turbine impeller, the two vortex flow paths being used to guide gas to the turbine impeller and forming in the same region along the axial direction of the turbine. The valve device includes: A valve body for opening and closing a confluence flow path, wherein the confluence flow path allows two branch flow paths, each branching from the two vortex flow paths, to merge, and is connected via a connecting port to an exhaust flow path supplying gas flow through the turbine impeller; and The valve stem is used to rotate the valve body about the valve shaft. The valve body includes: The valve seat includes a valve seat surface that can contact or separate from the communication port, and is capable of opening and closing the communication port; and The valve umbrella portion protrudes from the valve seat portion toward the confluence flow path, and is capable of separating the two branch flow paths within the confluence flow path. A hollow portion is formed on the radially inner side of the valve seat portion and the valve umbrella portion. The valve stem includes a valve body support portion, which is accommodated in the hollow portion of the valve body, and has an annular tilting allowance formed between the valve stem and the valve body to support the valve body so that it can tilt relative to the valve body support portion. The valve device further includes a support member disposed on the tilt allowance and configured to abut against a first surface of the valve body facing the tilt allowance and a second surface of the valve body support facing the tilt allowance.

2. The valve device according to claim 1, wherein, A mounting groove extending circumferentially is formed on the first surface or the second surface. The support member extends along the circumferential direction and is mounted in the mounting groove.

3. The valve device according to claim 2, wherein, The support component is a ring-shaped component extending along the circumferential direction. The surface in which the mounting groove is formed includes a conical surface that is inclined in such a way that the tilt allowance increases as it moves axially away from the edge of the mounting groove.

4. The valve device according to claim 2 or 3, wherein, The axial cross-section of the support component is circular or elliptical.

5. The valve device according to claim 4, wherein, The mounting groove has a V-shaped cross-section along the axial direction.

6. The valve device according to claim 1, wherein, The support member includes a sealing member configured to contact the first surface and the second surface respectively, and is configured to be radially expandable and contractile.

7. The valve device according to claim 6, wherein, The sealing component has an axial cross-section that is U-shaped or V-shaped with an opening on one side of the axial direction.

8. The valve device according to claim 1, wherein, The support component includes a plurality of spherical bodies arranged at intervals in the circumferential direction of the tilt allowance. A recess for mounting the spherical body is formed on the first surface or the second surface.

9. The valve device according to claim 8, wherein, The recess has a length direction along the axial direction and is configured to allow the spherical body mounted in the recess to roll along the axial direction.

10. The valve device according to any one of claims 1 to 3, 6 to 9, wherein, The valve body includes a central rod portion that extends from the bottom of the valve umbrella portion in a direction away from the confluence flow path. The valve body support includes a flange extending radially outward. The first surface is the inner circumferential surface of the valve seat portion or the valve umbrella portion. The second surface is the outer peripheral surface of the flange portion.

11. The valve device according to any one of claims 1 to 3, 6 to 9, wherein, The valve body includes a central rod portion that extends from the bottom of the valve umbrella portion in a direction away from the confluence flow path. The first surface is the outer peripheral surface of the middle rod portion. The second surface is the inner circumferential surface of the valve body support.

12. A turbine comprising: The valve device according to any one of claims 1 to 3, 6 to 9; The turbine impeller; and The turbine housing.

13. A turbocharger comprising the turbine of claim 12.

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