Valve assembly for wastegate of turbomachine and turbomachine

Abstract

This invention relates to a valve assembly for an exhaust valve of a turbine and a turbine. The valve assembly includes: a rocker arm, the rocker arm including an arm portion and a mounting portion fixed to the arm portion; and a valve unit fixed to the rocker arm and including: a valve cover, the valve cover having a sealing portion and a valve stem extending from the sealing portion, the sealing portion for engaging with an exhaust valve; and a mounting beam, the mounting beam having a mounting hole for mounting the valve stem, the mounting hole for mounting the valve stem, and the retaining rod fixed to the mounting portion of the rocker arm. The valve cover further has a first mating portion between the sealing portion and the valve stem, and the mounting beam further has a second mating portion surrounding the mounting hole, the second mating portion forming a line contact engagement with the first mating portion. This valve assembly enables precise engagement between the valve cover and the mounting beam, thereby improving the exhaust valve's sealing performance and extending the valve assembly's lifespan. This valve assembly also improves response speed, achieving a larger bypass flow capacity with a smaller valve cover opening.

Description

Technical Field

[0001] This invention relates to the field of turbine technology, and more specifically, to a valve assembly for an exhaust valve of a turbine. Additionally, this invention also relates to a turbine. Background Technology

[0002] A turbocharger uses exhaust gases from a natural gas engine, a gasoline engine, or a fuel cell to drive a turbine impeller, which in turn drives a compressor impeller via a common shaft to compress air and supply it to the engine. During turbocharger operation, the exhaust gas valve assembly is the core component for controlling exhaust gas release; this assembly can be actuated to switch between an open and closed state.

[0003] In natural gas or fuel engine applications, to prevent damage to the engine and turbocharger due to excessive intake pressure, the valve assembly needs to be switched to the open state under high-speed, high-load engine conditions. This allows the normally closed exhaust valve to open, enabling exhaust gas to flow out through a bypass channel, thereby controlling the input power to the turbine. Therefore, when the exhaust gas pressure exceeds a preset value, the valve assembly opens, allowing the exhaust gas to bypass the turbine impeller.

[0004] In existing technologies, turbine exhaust valves suffer from technical problems such as slow response speed, poor sealing effect, high leakage, and insufficient bypass flow capacity, making it difficult to meet the requirements of synchronous exhaust and precise control for twin-flow turbines. Furthermore, during turbine operation, the valve assembly is subjected to frequent vibrations, easily leading to wear between the valve cover and valve seat. In addition, the valve cover rotates circumferentially due to the swirling effect of the exhaust gas flow, further exacerbating component wear, ultimately resulting in decreased sealing performance and a shortened service life of the valve assembly.

[0005] Therefore, it is necessary to improve the exhaust valve assembly of existing turbochargers to overcome one or more defects in the prior art. Summary of the Invention

[0006] One object of the present invention is to provide a valve assembly for the exhaust valve of a turbine, which has a reasonable structural design, good sealing performance, high adjustment flexibility, low processing cost, and strong structural stability, and can be adapted to the dual-flow exhaust gas venting control requirements of a turbine.

[0007] Another object of the present invention is to provide a turbine including the valve assembly, which can effectively improve the exhaust control accuracy and overall operating efficiency of the turbine.

[0008] According to a first aspect of the invention, a valve assembly for an exhaust valve of a turbine is provided. The valve assembly may include: a rocker arm, which may include an arm portion and a mounting portion fixed to the arm portion; and a valve unit, which may be fixed to the rocker arm and includes: a valve cover, which may be provided with a sealing portion and a valve stem extending from the sealing portion, the sealing portion being for engaging with an exhaust valve; and a mounting beam, which is provided with a mounting hole and a retaining rod, the mounting hole being for mounting the valve stem and the retaining rod being fixed to the mounting portion of the rocker arm. The valve cover further includes a first mating portion between the sealing portion and the valve stem, and the mounting beam further includes a second mating portion surrounding the mounting hole, the second mating portion forming a line contact engagement with the first mating portion.

[0009] This valve assembly enables precise alignment between the valve cover and the mounting beam, improves the adjustment flexibility of the valve body and valve seat mating surfaces, thereby improving the exhaust valve's sealing performance, reducing friction in the valve assembly, and extending its lifespan. Furthermore, this valve assembly can achieve a larger bypass flow capacity with a smaller valve cover opening while increasing response speed.

[0010] According to the above aspects of the present invention, preferably, the first mating portion can be a part of a protruding first spherical profile, while the second mating portion can be a part of a concave conical profile or a concave second spherical profile, wherein the curvature of the first spherical profile can be different from the curvature of the second spherical profile.

[0011] By using the line contact between the spherical surface and the conical / spherical surface with different curvatures, the frictional resistance of the mating surface can be reduced, the smoothness of the valve cover position adjustment can be improved, and the fit of the mating surface can be guaranteed, thus improving the sealing performance of the exhaust valve.

[0012] According to the above aspects of the present invention, preferably, the valve stem may include a first section that can mate with a mounting hole, and the cross-sections of the first section and the mounting hole have a non-circular profile; and the valve stem may also include a second section, wherein the first section is disposed between the first mating portion and the second section, and the radial dimension of the second section may be smaller than the radial dimension of the first section, wherein a first gasket is mounted on the second section to hold the valve cover to the mounting beam.

[0013] By using a non-circular profile to achieve anti-rotation limiting of the valve cover, it is possible to avoid wear caused by airflow impact. In addition, this gasket arrangement allows for axial adjustment space for the valve cover, further reducing wear on the valve assembly and improving the sealing effect.

[0014] According to the above aspects of the present invention, preferably, the non-circular profile may include at least one of the following: an oblong, elliptical, or polygonal profile, wherein a first circumferential gap is formed between the first segment of the valve stem and the mounting hole, and wherein a first axial gap is formed between the first gasket and the mounting beam.

[0015] The various non-circular profiles of the present invention can adapt to different processing scenarios, improving design versatility. The first circumferential clearance can prevent the valve cover from jamming with the mounting hole, and the axial clearance provides space for the axial position adjustment of the valve cover, thereby allowing the valve cover to self-adjust, further optimizing the fit between the valve cover and the valve seat, and improving the sealing effect.

[0016] According to the above aspects of the present invention, preferably, the valve cover may include a first valve cover and a second valve cover arranged at intervals from each other, and the mounting holes of the mounting beam may include a first mounting hole and a second mounting hole, such that the first valve cover and the second valve cover can be held to the mounting beam via the first mounting hole and the second mounting hole, respectively.

[0017] The first and second valve covers can be adapted to the two exhaust gas passages of the turbine, respectively, to achieve synchronous opening or closing of the two passages. This dual valve cover / core design allows for a unique pressure field distribution, which can reduce the aerodynamic load on the valve assembly.

[0018] In addition, this arrangement can be adapted to dual-scroll / dual-flow turbines, thereby achieving precise and synchronous opening and closing of the exhaust valve, improving the exhaust control accuracy of the turbine, reducing leakage, and improving the overall working efficiency and stability of the turbine, while adapting to the cost and processing requirements of mass production.

[0019] According to the above aspects of the present invention, preferably, the mounting portion may be provided with a third mounting hole, the retaining rod of the mounting beam may extend through the third mounting hole, and a second washer is provided at the free end of the retaining rod to mount the mounting beam to the mounting portion of the rocker arm.

[0020] This arrangement allows for the detachable fixing of the mounting beam and rocker arm, facilitating production and assembly. Furthermore, the gasket structure cushions the impact force during rocker arm rotation and allows for adaptive adjustment of the valve cover, reducing rigid wear between components and further improving sealing performance.

[0021] According to the above aspects of the invention, preferably, a non-circular mating portion can be formed between the third mounting hole and the retaining rod to at least partially suppress rotation of the mounting beam relative to the mounting portion of the rocker arm.

[0022] Similarly, this non-circular profile enables anti-rotation limiting of the mounting beam and valve cover, reduces wear between valve assembly components, and improves sealing performance.

[0023] According to the above aspects of the present invention, preferably, a second circumferential gap can be formed between the third mounting hole and the retaining rod, and wherein a second axial gap is formed between the second gasket and the mounting portion.

[0024] This second circumferential clearance prevents the rocker arm from jamming with the mounting hole and accommodates minor displacements during rocker arm rotation. Additionally, this second axial clearance compensates for displacement deviations caused by rocker arm tilting, ensuring the levelness of the mounting beam and thus improving the sealing effect.

[0025] According to the above aspects of the present invention, preferably, an adjustment gap can be provided between the first mating part and the second mating part, the adjustment gap being used to adjust the position of the valve cover relative to the mounting beam.

[0026] This adjustment gap provides the valve cover with multi-directional adjustment space, compensates for the dimensional and positional tolerances caused by machining and assembly, and enables the sealing part of the valve cover to fit precisely with the exhaust valve, further improving the sealing performance of the valve cover.

[0027] According to the above aspects of the present invention, preferably, the arm portion and the mounting portion of the rocker arm can be integrally formed by casting, and / or the sealing portion, the valve stem, and the first mating portion can be integrally formed by casting.

[0028] Casting as a single unit reduces the number of connection points between components, improves the overall strength and stability of the structure, and reduces processing and assembly costs.

[0029] According to the above aspects of the invention, preferably, the mounting portion of the rocker arm may be formed with a flanged stop portion, the flanged stop portion being shaped to extend from the side of the mounting beam to at least partially suppress the rotation of the mounting beam relative to the mounting portion.

[0030] Since the machining of non-circular contours is relatively complex, this flanged stop allows for a reduction in machining difficulty and cost, while simultaneously achieving anti-rotation limiting of the mounting beam. The structure is simple and the limiting effect is reliable, making it more suitable for large-scale machining needs.

[0031] According to the above aspects of the present invention, preferably, the rocker arm may further include a pivot shaft, and the pivot shaft, the arm portion and the mounting portion may be integrally formed, wherein the pivot shaft may include a first section extending beyond the end of the mounting portion, and a shaft region having a first length is formed along the pivot axis of the pivot shaft to avoid collision between the tool and the mounting portion during machining.

[0032] The integral molding of the pivot shaft and rocker arm allows for improved structural coaxiality, and the relatively shortened mounting portion avoids potential collisions between the cutting tool and the mounting portion when machining the shaft area, thus improving machining efficiency. At the same time, it ensures the precision of the pivot shaft's finishing surface and reduces the frictional resistance of the pivot shaft rotation when the valve assembly opens and closes.

[0033] According to the above aspects of the present invention, preferably, the bottom surface of the mounting portion is a surface inclined to both sides, such that a tapered gap is formed between the bottom surface of the mounting portion and the top surface of the mounting beam, and the tapered gap increases to both sides.

[0034] This tapered gap allows the mounting beam to tilt due to the misalignment between the valve cover and the valve seat, enabling the mounting beam to pivot in a seesaw manner. This allows the valve cover to first fit against both sides of the exhaust valve before achieving an overall seal, improving the sealing effect and reducing leakage.

[0035] According to the above aspects of the present invention, preferably, the sealing portion of the valve cover can be formed in a bell shape, and a hollowed-out portion is provided on the side away from the mounting beam.

[0036] The bell shape improves the fit between the sealing part and the exhaust valve, enhancing the sealing effect; the hollowing out of the non-sealing area reduces the weight of the valve cover, lowers the overall component weight, saves material costs, and does not affect the sealing performance of the sealing part.

[0037] According to a second aspect of the invention, a turbine is provided, which may include: a valve assembly for an exhaust valve of the turbine according to the above aspects of the invention; and an exhaust valve disposed on the turbine casing, wherein the valve assembly cooperates with the exhaust valve to selectively open or close the exhaust valve.

[0038] By adapting to the aforementioned valve assembly, the turbine achieves precise and synchronous opening and closing of the exhaust valve, effectively improving exhaust control accuracy, reducing leakage, and simultaneously enhancing the overall working efficiency and stability of the turbine, while also meeting the cost and processing requirements of mass production.

[0039] Thus, the valve assembly for the exhaust valve of a turbine and the turbine of the present invention overcome the disadvantages of the prior art and achieve the intended purpose. Attached Figure Description

[0040] To further clarify the valve assembly for the exhaust valve of a turbine according to the present invention, the invention will now be described in detail with reference to the accompanying drawings and specific embodiments, in which: Figure 1 This is a schematic cross-sectional perspective view of a turbine according to a non-limiting embodiment of the present invention; Figure 2 yes Figure 1 A schematic partial cross-sectional view of the valve assembly of the turbine shown, in conjunction with the exhaust valve; Figure 3 This is a schematic partial cross-sectional view of a valve assembly according to a non-limiting embodiment of the present invention; Figure 4 This is a schematic perspective view of a valve assembly according to a first non-limiting embodiment of the present invention; Figure 5 yes Figure 4 A schematic exploded perspective view of the valve assembly shown; Figure 6 yes Figure 4A schematic top view of the valve assembly shown; Figure 7 yes Figure 4 The schematic side sectional view of the valve assembly shown is taken along line S1-S1; Figure 8 yes Figure 7 A schematic enlarged view of a portion; Figure 9 yes Figure 4 The schematic top sectional view of the valve assembly shown is taken along line S2-S2; Figure 10 yes Figure 4 The schematic end sectional view of the valve assembly shown is taken along line S3-S3; Figure 11 This is a schematic exploded perspective view of a valve assembly according to a second non-limiting embodiment of the present invention; Figure 12 This is a schematic top perspective view of a valve assembly according to a third non-limiting embodiment of the present invention; Figure 13 This is a schematic end perspective view of a valve assembly according to a third non-limiting embodiment of the present invention.

[0041] The above figures are for illustrative purposes only and are not drawn to scale.

[0042] The reference numerals in the figures are listed in the figures and embodiments: 1000 – Turbines, including: 100 - Valve assembly, including: 10 - Rocker arm, including: 11 - Arm; 12 - Installation section, including: 12A – First surface; 12B – Second surface; 121 – Third mounting hole; 122 - Flanged stop section; 123A – First through hole; 123B – Second through hole; 13 - Pivot axis, including: 131 – First Section; 132 – Second Section; 133 – Third Section; 20 - Valve unit, including: 21 - Valve cover, including: 21A – First valve cover; 21B – Second valve cover; 211 - Sealing part; 212 - Valve stem, including: 212A – Part One; 212B – Part Two; 213 – First Coordination Unit; 22 - Installation beam, including: 221 - Mounting hole, including: 221A – First mounting hole; 221B – Second mounting hole; 222 - Holder; 223 – Second Coordination Unit; 31 - First gasket; 32 - Second gasket; 200 - vortex shell, including: 210 - Exhaust valve; 200A - Exhaust port; 300 - Bushing; A – Pivot axis; L – First length; G – Adjustment gap; Gc1 – First circumferential clearance; Ga1 – First axial clearance; Gc2 – Second circumferential clearance; Ga2 – Second axial clearance; Gt – tapered gap. Detailed Implementation

[0043] It should be understood that, unless explicitly stated otherwise, the invention may take various alternative orientations and sequences of steps. It should also be understood that the specific apparatus shown in the drawings and described in the specification are merely exemplary embodiments of the inventive concept disclosed and defined herein. Therefore, unless expressly stated otherwise, the specific orientations, directions, or other features involved in the various disclosed embodiments should not be considered limiting.

[0044] The turbine may include an exhaust turbine assembly capable of receiving exhaust gas from the cylinders of an internal combustion engine or from a fuel cell (such as a hydrogen fuel cell). This exhaust gas can be directed to the turbine impeller to extract energy and drive the compressor impeller of the compressor assembly. The rotation of the compressor impeller introduces intake air into the compressor housing, and the compressed gas (such as compressed air) can enter the engine combustion chamber or fuel cell, thereby improving the overall operating efficiency of the internal combustion engine or fuel cell. The turbine can improve the efficiency of the internal combustion engine or fuel cell. The exhaust valve assembly for the turbine may be part of the turbine or turbocharger, or may be used for one or more other purposes, whether as part of an internal combustion engine or as part of another type of engine or fuel cell.

[0045] Figure 1 This is a schematic cross-sectional perspective view of a turbine 1000 according to a non-limiting embodiment of the present invention; Figure 2 yes Figure 1 A schematic partial cross-sectional view of the valve assembly 100 of the turbine 1000 in cooperation with the exhaust valve 210; and Figure 3 This is a schematic partial cross-sectional view of a valve assembly 100 according to a non-limiting embodiment of the present invention.

[0046] As shown in the figure and by way of non-limiting example, the turbine 1000 is part of a turbocharger. In this embodiment, the turbine 1000 may include a volute 200 having a dual-flow or dual-scroll configuration. Each flow path is connected to, for example, an exhaust port of an internal combustion engine or receives exhaust gas from that exhaust port for guiding the exhaust gas to the turbine impeller and subsequently discharging it via an exhaust port 200A, for example, to the external environment.

[0047] An exhaust valve 210 can be installed upstream of the exhaust port 200A to allow exhaust gas to bypass the turbine impeller. A valve assembly 100 can be installed at the exhaust valve 210, which can be actuated to switch between open and closed states. Specifically, when the exhaust gas pressure exceeds a predetermined value, the valve assembly 100 can open, allowing the exhaust gas to bypass through the exhaust valve 210 and preventing excessive pressure at the turbine end.

[0048] exist Figure 2 In the illustrated dual-flow turbine 1000, two exhaust valves 210 may be provided. The outlet of the exhaust valve 210 can be suitably shaped to serve as a valve seat that mates with the valve assembly 100. Figure 3 As schematically shown, an opening may be provided at a suitable location in the volute 200, in which a bushing 300 may be disposed to allow the pivot shaft 13 to pass through, thereby controlling the opening and closing of the valve assembly 100 via an actuator such as an electric or pneumatic one. Thus, the valve assembly 100 can cooperate with the exhaust valve 210 to selectively open or close the exhaust valve 210.

[0049] Figure 4 This is a schematic perspective view of a valve assembly 100 according to a first non-limiting embodiment of the present invention; Figure 5 yes Figure 4 A schematic exploded perspective view of the valve assembly 100 shown; and Figure 6 yes Figure 4 A schematic top view of the valve assembly 100 shown.

[0050] As shown in the figure, the valve assembly 100 mainly includes a rocker arm 10 and a valve unit 20. The valve unit 20 is fixed to the rocker arm 10, and the exhaust valve 210 is opened or closed as the rocker arm 10 rotates. Therefore, the valve assembly 100 according to the present invention can also be called a rocker arm exhaust valve assembly or a rocker arm valve assembly (AVA).

[0051] As an example, the rocker arm 10 may mainly include an arm portion 11, a mounting portion 12, and a pivot shaft 13. In this example, the rocker arm 10 may be formed in a generally L-shaped configuration, and the arm portion 11 may be arranged between the mounting portion 12 and the pivot shaft 13.

[0052] like Figure 3 As shown in more detail below, the arm 11 can be fixed to one end of the pivot 13, for example... Figure 3 The right end is shown in the diagram. For example, the arm 11 can be welded to the right end of the pivot shaft 13 to securely hold it to the pivot shaft 13 and thus rotate with the pivot shaft 13. The pivot shaft 13 can extend through the bushing 300, with the arm 11 fixed at one end, while the other end can be connected to an actuator via a corresponding transmission mechanism (e.g., a linkage mechanism) to rotate about the pivot axis A.

[0053] The mounting portion 12 can be fixed to the arm portion 11, or integrally formed with the arm portion 11, for mounting the valve unit 20. According to a preferred embodiment of the invention, the arm portion 11 and the mounting portion 12 of the rocker arm 10 can be integrally formed by casting.

[0054] exist Figure 5 In the illustrated embodiment, the mounting portion 12 may have a generally rectangular outline and may mainly include a third mounting hole 121, a flanged stop portion 122, and a first through hole 123A and a second through hole 123B located on both sides of the third mounting hole 121.

[0055] The main body of the mounting section 12 may be a generally rectangular mounting plate, and may include a first surface 12A and a second surface 12B, wherein the first surface 12A and the second surface 12B may be respectively Figure 5 The top and bottom surfaces are shown in the figure. As an example, the third mounting hole 121 can be centrally positioned on the mounting portion 12, and the first through hole 123A and the second through hole 123B can be arranged symmetrically about the third mounting hole 121.

[0056] In this embodiment, the flange stop 122 can be shaped to extend from the side of the mounting beam 22 to at least partially suppress rotation of the mounting beam 22 relative to the mounting portion 12. Therefore, the flange stop 122 can be used as an anti-rotation device, and such an anti-rotation device is easy to manufacture, thereby allowing its application in mass production and reducing costs.

[0057] The valve unit 20 can be fixed to the rocker arm 10 and mainly includes a valve cover 21 and a mounting beam 22. The mounting beam 22 can be used as a connecting component between the valve cover 21 and the rocker arm 10 to achieve the fixing and position adjustment of the valve cover 21.

[0058] like Figure 5 As shown more clearly in the diagram, the valve cover 21 may be provided with a sealing portion 211, a valve stem 212, and a first mating portion 213 between the sealing portion 211 and the valve stem 212. In a preferred embodiment, the sealing portion 211, the valve stem 212, and the first mating portion 213 may be formed as a single piece and may be integrally formed by casting.

[0059] The sealing part 211 can be fitted to the exhaust valve 210 for opening or closing the exhaust valve 210. The valve stem 212 can be fitted to the mounting beam 22, such that the first mating part 213 can be fitted with the second mating part 223 of the mounting beam 22, and the specific arrangement will be described in more detail below with reference to the accompanying drawings.

[0060] Figure 7 yes Figure 4 A schematic side sectional view of the valve assembly 100 taken along line S1-S1; Figure 8 yes Figure 7 A schematic enlarged view of a portion; Figure 9 yes Figure 4 The schematic top sectional view of valve assembly 10-0 taken along line S2-S2 is shown; while Figure 10 yes Figure 4 The schematic end view of the valve assembly 100 shown is taken along line S3-S3.

[0061] As shown in the figure and as a non-limiting embodiment, the sealing portion 211 of the valve cover 21 can be formed in a bell shape, thereby improving the fit with the sealing surface of the exhaust valve 210 and enhancing the sealing effect. Specifically, the sealing portion 211 may have a hollowed-out portion on the side away from the mounting beam 22 (i.e., the lower side shown in the figure). This can save material costs for the valve cover 21, while reducing the overall weight of the valve assembly 100 and improving the flexibility of movement, without affecting the sealing performance of the valve cover 21.

[0062] The valve stem 212 can extend from the sealing portion 211 and may include adjacent first segments 212A and second segments 212B. The second segment 212B may be the free end of the valve stem 212, such that the first segment 212A is disposed between the first mating portion 213 and the second segment 212B. Preferably, the radial dimension of the second segment 212B may be smaller than the radial dimension of the first segment 212A.

[0063] Continue to refer to Figure 5The mounting beam 22 may have a generally rectangular outline and may be provided with mounting holes 221 and retaining rods 222. Preferably, the two mounting holes 221 may be symmetrically arranged on both sides of the retaining rods 222. The mounting beam 22 may be mounted to the mounting portion 12 of the rocker arm 10, and the positions of the two mounting holes 221 and the retaining rods 222 may approximately correspond to the positions of the first through hole 123A, the second through hole 123B, and the third mounting hole 121; for example, the centers of these features may be aligned with each other.

[0064] Mounting hole 221 can be used to mount valve stem 212, while third mounting hole 121 can be used to mount retaining rod 222. In this way, valve cover 21 can be mounted to mounting beam 22, and mounting beam 22 can be fixed to mounting portion 12 of rocker arm 10, thereby attaching valve cover 21 to rocker arm 10 to follow the pivoting movement of rocker arm 10 and achieve the desired opening and closing function.

[0065] At this time, the corresponding valve stems 212 of the first valve cover 21A and the second valve cover 21B can be respectively set in the first through hole 123A and the second through hole 123B, so that the free end of the valve stem 212 does not protrude from the first through hole 123A and the second through hole 123B.

[0066] In the embodiment shown in the accompanying drawings, the valve cover 21 may include a first valve cover 21A and a second valve cover 21B arranged at intervals from each other, and the mounting hole 221 of the mounting beam 22 includes a first mounting hole 221A and a second mounting hole 221B, such that the first valve cover 21A and the second valve cover 21B can be held to the mounting beam 22 via the first mounting hole 221A and the second mounting hole 221B, respectively.

[0067] Specifically, and as an example, the first segment 212A of the valve stem 212 can mate with the mounting hole 221, and the cross-sections of the first segment 212A and the mounting hole 221 have non-circular profiles, thereby forming a non-cylindrical mating surface to prevent the valve cover from rotating freely, thus reducing wear. After the first segment 212A is mated with the mounting hole 221, a first gasket 31 can be installed on the second segment 212B to hold the valve cover 21 to the mounting beam 22. As an example, the first gasket 31 can be welded or riveted to the second segment 212B.

[0068] like Figure 7 and 8 As schematically shown, after the valve stem 212 is mounted to the mounting beam 22 using the first gasket 31, a first circumferential clearance Gc1 is formed between the first section 212A of the valve stem 212 and the first mounting hole 221A and the second mounting hole 221B, respectively, and a first axial clearance Ga1 is formed between the first gasket 31 and the mounting beam 22. It should be understood that this first axial clearance Ga1 can be the clearance measured when the valve cover 21 abuts against the mounting beam 22.

[0069] Preferably, the first circumferential gap Gc1 formed by the first section 212A and the first mounting hole 221A and the second mounting hole 221B can be substantially the same, and the first axial gap Ga1 formed between the first gaskets 31 on both sides and the mounting beam 22 is also substantially the same.

[0070] In addition, such as Figure 7 and Figure 8 As shown in more detail, the bottom surface or second surface 12B of the mounting portion 12 is an inclined surface towards both sides, such that a tapered gap Gt is formed between the bottom surface of the mounting portion 12 and the top surface of the mounting beam 22, and the tapered gap increases towards both sides. In other words, in Figure 7 In the middle, the tapered gap Gt is the largest on the left and right sides, and the smallest in the middle part near the retaining rod 222.

[0071] like Figure 9 As schematically shown, the cross-section of the first segment 212A and the mounting hole 221 is oblong. However, in an alternative embodiment not shown, the cross-section of the first segment 212A and the mounting hole 221 may be other types of non-circular profiles, such as elliptical or polygonal profiles.

[0072] Continue to refer to Figure 5 and Figure 7 As can be seen, the retaining rod 222 of the mounting beam 22 can extend through the third mounting hole 121, and a second washer 32 is provided at the free end of the retaining rod 222 to mount the mounting beam 22 to the mounting portion 12 of the rocker arm 10. As an example, the second washer 32 can be welded or riveted to the retaining rod 222. Similarly, a second circumferential clearance Gc2 can be formed between the third mounting hole 121 and the retaining rod 222, and a second axial clearance Ga2 can be formed between the second washer 32 and the mounting portion 12. It should be understood that this second axial clearance Ga2 can be the clearance measured when the mounting portion 12 abuts against the mounting beam 22.

[0073] In addition, the mounting beam 22 is also provided with a second mating part 223 surrounding the mounting hole 221, and the second mating part 223 forms a line contact fit with the first mating part 213. Figure 7 As schematically shown, the second mating part 223 can be arranged around the mounting hole 221 on the lower side of the mounting beam 22 and is formed as a generally conical or arc-shaped recess.

[0074] In a preferred embodiment, the first mating portion 213 of the valve cover 21 may be part of a protruding first spherical profile, while the second mating portion 223 of the mounting beam 22 may be part of a concave conical profile or a concave second spherical profile, wherein the curvature of the first spherical profile is different from the curvature of the second spherical profile.

[0075] Better and as Figure 7 and Figure 8 As shown, the curvature of the first spherical profile can be less than the curvature of the second spherical profile. Furthermore, preferably, an adjustment gap G can be provided between the first mating portion 213 and the second mating portion 223, which is used to adjust the position of the valve cover 21 relative to the mounting beam 22.

[0076] It should be understood that, as described herein in conjunction with the accompanying drawings, "line contact" can refer to an arc-shaped line contact along the circumferential direction, and such line contact can form a complete circle or a part of a circle.

[0077] In a preferred embodiment, these circumferential clearances, axial clearances, and / or line contact fits allow the valve cover 21 to adaptively adjust its orientation and / or position when fitted to the exhaust valve 210 or valve seat, thereby ensuring sealing performance and reducing wear on the valve cover 21.

[0078] Figure 11 This is a schematic exploded perspective view of a valve assembly 100 according to a second non-limiting embodiment of the present invention.

[0079] It should be understood that, in addition to the following description, in combination Figure 11 The second embodiment of the valve assembly 100 described herein can be combined with Figures 4 to 10 The valve assembly 100 described in the first embodiment is the same as or similar to that described above, and the same parts are labeled with the same reference numerals. For the sake of brevity, these same parts will not be described again below.

[0080] exist Figure 11 In some embodiments, an additional anti-rotation device may be provided, either attached to or replacing the flange stop 122. Specifically, a non-circular mating portion, such as the generally square mating portion shown in the figures, may be formed between the third mounting hole 121 and the retaining rod 222 to at least partially suppress rotation of the mounting beam 22 relative to the mounting portion 12 of the rocker arm 10. In this case, specifically, the third mounting hole 121 may be a square hole with rounded corners, and the retaining rod 222 may similarly have a mating shape, for example, at least one side being straight, thereby achieving the desired anti-rotation effect.

[0081] Figure 12 This is a schematic top perspective view of a valve assembly 100 according to a third non-limiting embodiment of the present invention; and Figure 13 This is a schematic end perspective view of a valve assembly 100 according to a third non-limiting embodiment of the present invention.

[0082] It should be understood that, in addition to the following description, in combination Figure 12 and Figure 13The third embodiment of the valve assembly 100 described herein can be combined with Figures 4 to 10 The valve assembly 100 described in the first embodiment is the same as or similar to that described above, and the same parts are labeled with the same reference numerals. For the sake of brevity, these same parts will not be described again below.

[0083] exist Figure 12 and Figure 13 In one embodiment, the pivot shaft 13, arm 11, and mounting portion 12 of the rocker arm 10 are formed as a single piece, for example, by casting.

[0084] Specifically, such as Figure 12 As schematically shown, the pivot shaft 13 may include a first segment 131, a second segment 132, and a third segment 133. The second segment 132 may be located between the first segment 131 and the third segment 133, and the diameter of the second segment 132 may be smaller than that of the first segment 131 and the third segment 133. The first segment 131 and the third segment 133 may mate with the bushing 300 to reduce the frictional force generated when the pivot shaft 13 pivots.

[0085] Specifically, in this embodiment, the length of the mounting portion 12 of the rocker arm 10 is shortened, allowing the first segment 131 to extend beyond the end of the mounting portion 12. For example... Figure 12 As schematically shown, the ends of both sides of the mounting portion 12 can be approximately located at the center of the valve stem 212 or the mounting hole 221. In this case, both the first through hole 123A and the second through hole 123B can be half-holes, rather than full-circle holes. Thus, the pivot shaft 13 forms a shaft region with a first length L along its pivot axis A. This shaft region can refer to the area extending beyond the ends of the mounting portion 12, to avoid collisions between the cutting tool and the rocker arm 10 during machining, and particularly to avoid collisions with the mounting portion 12.

[0086] The terms “left side” and “right side” used herein to indicate orientation or direction, and “first” and “second” used to indicate sequence, are merely to enable those skilled in the art to better understand the concept of the invention as illustrated in the preferred embodiments, and are not intended to limit the invention. Unless otherwise stated, all sequences, orientations, or directions are used only to distinguish one element / component / structure from another, and do not indicate any particular order, sequence of operations, direction, or orientation unless otherwise stated. For example, in an alternative embodiment, “first valve cover” could be “second valve cover”, etc. One valve cover or two valve covers.

[0087] As used herein, unless otherwise specified, the terms “approximately” and “about” are interpreted as indicating a value or range of values ​​plus or minus five percent, or a deviation of the shape and / or position from the value by plus or minus five percent.

[0088] In summary, the exhaust valve assembly 100 for a turbine according to embodiments of the present invention overcomes the disadvantages of the prior art and achieves the intended purpose of the invention.

[0089] While the valve assembly for the exhaust valve of a turbine according to the present invention has been described above with reference to preferred embodiments, those skilled in the art should recognize that the above examples are merely illustrative and should not be construed as limiting the invention. Therefore, various modifications and variations can be made to the invention within the spirit and scope of the claims, and all such modifications and variations will fall within the scope claimed by the claims.

Claims

1. A valve assembly (100) for an exhaust valve of a turbine, comprising: A rocker arm (10) includes an arm (11) and a mounting portion (12) fixed to the arm. as well as Valve unit (20), the valve unit being fixed to the rocker arm (10) and comprising: A valve cover (21), the valve cover having a sealing portion (211) and a valve stem (212) extending from the sealing portion, the sealing portion (211) being used to engage with the exhaust valve; and Mounting beam (22), which is provided with mounting hole (221) and retaining rod (222), the mounting hole is used to mount valve stem (212), and the retaining rod (222) is fixed to the mounting part (12) of rocker arm (10). The valve cover (21) is provided with a first mating part (213) between the sealing part (211) and the valve stem (212), and the mounting beam (22) is provided with a second mating part (223) surrounding the mounting hole (221), and the second mating part (223) and the first mating part (213) form a line contact mating.

2. The valve assembly (100) according to claim 1, characterized in that, The first mating part (213) is a part of a protruding first spherical profile, while the second mating part (223) is a part of a concave conical profile or a concave second spherical profile, wherein the curvature of the first spherical profile is different from the curvature of the second spherical profile.

3. The valve assembly (100) according to claim 1, characterized in that, The valve stem (212) includes a first segment (212A) that mates with the mounting hole (221), and both the first segment (212A) and the mounting hole (221) have non-circular cross-sections; and The valve stem (212) further includes a second section (212B), wherein the first section (212A) is disposed between the first mating part (213) and the second section (212B), and the radial dimension of the second section (212B) is smaller than the radial dimension of the first section (212A), wherein a first gasket (31) is mounted on the second section (212B) to hold the valve cover (21) to the mounting beam (22).

4. The valve assembly (100) according to claim 3, characterized in that, The non-circular profile includes at least one of the following: an oblong, elliptical, or polygonal profile, wherein a first circumferential clearance (Gc1) is formed between the first segment (212A) of the valve stem (212) and the mounting hole (221), and A first axial gap (Ga1) is formed between the first gasket (31) and the mounting beam (22).

5. The valve assembly (100) according to claim 1, characterized in that, The valve cover (21) includes a first valve cover (21A) and a second valve cover (21B) arranged at intervals from each other, and the mounting hole (221) of the mounting beam (22) includes a first mounting hole (221A) and a second mounting hole (221B), such that the first valve cover (21A) and the second valve cover (21B) can be held to the mounting beam (22) via the first mounting hole (221A) and the second mounting hole (221B), respectively.

6. The valve assembly (100) according to claim 5, characterized in that, The mounting part (12) is provided with a third mounting hole (121), the retaining rod (222) of the mounting beam (22) can extend through the third mounting hole (121), and a second gasket (32) is provided at the free end of the retaining rod (222) to mount the mounting beam (22) to the mounting part (12) of the rocker arm (10).

7. The valve assembly (100) according to claim 6, characterized in that, A non-circular mating portion is formed between the third mounting hole (121) and the retaining rod (222) to at least partially suppress the rotation of the mounting beam (22) relative to the mounting portion (12) of the rocker arm (10).

8. The valve assembly (100) according to claim 6, characterized in that, A second circumferential gap (Gc2) is formed between the third mounting hole (121) and the retaining rod (222), and A second axial gap (Ga2) is formed between the second gasket (32) and the mounting portion (12).

9. The valve assembly (100) according to any one of claims 1-8, characterized in that, An adjustment gap (G) is provided between the first mating part (213) and the second mating part (223), the adjustment gap being used to adjust the position of the valve cover (21) relative to the mounting beam (22).

10. The valve assembly (100) according to any one of claims 1-8, characterized in that, The arm portion (11) and the mounting portion (12) of the rocker arm (10) are integrally formed by casting, and / or The sealing part (211), the valve stem (212), and the first mating part (213) are integrally formed by casting.

11. The valve assembly (100) according to any one of claims 1-8, characterized in that, The mounting portion (12) of the rocker arm (10) is provided with a flange stop (122) which is shaped to extend from the side of the mounting beam (22) to at least partially suppress the rotation of the mounting beam (22) relative to the mounting portion (12).

12. The valve assembly (100) according to any one of claims 1-8, characterized in that, The rocker arm (10) also includes a pivot shaft (13), and the pivot shaft (13), the arm portion (11), and the mounting portion (12) are integrally formed. The pivot shaft (13) includes a first section (131) that extends beyond the end of the mounting portion (12) and forms a shaft region with a first length (L) along the pivot axis (A) of the pivot shaft (13) to avoid the tool colliding with the mounting portion (12) during machining.

13. The valve assembly (100) according to any one of claims 1-8, characterized in that, The bottom surface of the mounting part (12) is inclined to both sides, so that a tapered gap (Gt) is formed between the bottom surface of the mounting part (12) and the top surface of the mounting beam (22), and the tapered gap increases to both sides.

14. The valve assembly (100) according to any one of claims 1-8, characterized in that, The sealing portion (211) of the valve cover (21) is formed in a bell shape and has a hollowed-out portion on the side away from the mounting beam (22).

15. A turbine (1000), the turbine comprising: The valve assembly (100) according to any one of claims 1-14. as well as An exhaust valve (210) is provided on the volute (200) of the turbine (1000), wherein the valve assembly (100) cooperates with the exhaust valve (210) to selectively open or close the exhaust valve (210).

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