Hydraulic turbine and its movable guide vane

Abstract

The present application discloses a water turbine and its movable guide vanes. The water turbine includes a runner, and the movable guide vanes are arranged radially outward of the runner. The movable guide vanes include an inlet end and an outlet end arranged opposite to each other along the direction of water flow, with the outlet end adjacent to and spaced from the runner. The movable guide vanes include a pressure surface and a suction surface, with the suction surface being arranged on one side of the pressure surface along a first direction intersecting the direction of water flow. The pressure surface and the suction surface are connected to an arc-shaped edge line at the outlet end. In the direction of water flow, the arc-shaped edge line convexly curves toward the inlet end, thereby forming a concave space at the outlet end, which is beneficial for increasing the distance of the turbine's bladeless area, reducing the dynamic and static interference between the movable guide vanes and the runner, thereby reducing pressure pulsation in the bladeless area and improving the hydraulic characteristics of the water turbine.

Description

Technical Field

[0001] The present application belongs to the technical field of water turbines, and in particular relates to a water turbine and a movable guide vane thereof. Background Art

[0002] Pumped-storage power stations have multiple uses, including peak-load shifting, frequency and phase regulation, and emergency backup, and play a vital role in ensuring the safe, stable, and economical operation of power systems. As a key component of pumped-storage power stations, turbines are increasingly developing towards higher heads, higher speeds, and larger capacities.

[0003] A turbine's guide vanes are crucial flow-through components. Their function is to control the flow direction and flow rate at the runner inlet, thereby achieving efficient and stable operation. The shape of the guide vanes not only affects unit efficiency but also the hydraulic characteristics of the turbine's most critical area (the bladeless area). Summary of the Invention

[0004] An embodiment of the present application provides a water turbine and a movable guide vane thereof, which can reduce pressure pulsation in a bladeless area of the water turbine, thereby improving hydraulic characteristics.

[0005] According to a first aspect of the present application, a movable guide vane for a water turbine is provided. The water turbine includes a runner, and the movable guide vane is disposed radially outward of the runner. The movable guide vane includes an inlet end and an outlet end disposed opposite each other along the direction of water flow, the outlet end being adjacent to and spaced from the runner. The movable guide vane includes a pressure surface and a suction surface, the suction surface being disposed to one side of the pressure surface along a first direction intersecting the direction of water flow. The pressure surface and the suction surface are connected by an arcuate edge at the outlet end, and the arcuate edge is curved convexly toward the inlet end in the direction of water flow.

[0006] In some embodiments, the arcuate edge lines are symmetrically arranged with respect to a plane bisecting the movable guide vane in the second direction, and the second direction, the first direction, and the water flow direction intersect with each other.

[0007] In some embodiments, two ends of the arcuate edge line that are opposite to each other along the second direction are arranged flush in the water flow direction, and the second direction, the first direction, and the water flow direction intersect each other; in the water flow direction, a first distance between the highest point of the arcuate edge line protruding toward the inlet end and the end of the arcuate edge line is ΔL, and when the movable guide vane is at the rated opening, a second distance between the end of the arcuate edge line and the radial outer edge of the runner is L, and ΔL and L satisfy: ΔL / L = 0.1 to 0.3.

[0008] In some embodiments, in the first direction, the arcuate edge curves convexly toward the pressure surface.

[0009] In some embodiments, the two ends of the arcuate edge are arranged flush along the first direction; in the first direction, the third distance between the highest point of the arcuate edge protruding toward the pressure surface and the two ends of the arcuate edge is Δh; in the water flow direction, the second distance between the end of the arcuate edge and the radial outer edge of the impeller is L, and Δh and L satisfy: Δh / L = 0.05~0.2.

[0010] In some embodiments, at least a portion of the suction side is convexly curved toward the pressure side.

[0011] In some embodiments, the curvature of at least a portion of the suction surface gradually increases in the direction of water flow from the inlet end to the outlet end.

[0012] In some embodiments, the suction surface is symmetrically arranged with respect to a plane bisecting the movable guide vane in the second direction, and the second direction, the first direction, and the water flow direction intersect with each other.

[0013] In some embodiments, an end region of the suction surface adjacent to the outflow end matches an end region of the pressure surface adjacent to the inflow end in shape.

[0014] According to a second aspect of the present application, the present application further provides a water turbine, comprising: a runner; and the movable guide vanes provided in any one of the above embodiments, wherein the movable guide vanes are arranged radially outside the runner.

[0015] In some embodiments, there are multiple movable guide vanes; the multiple movable guide vanes are evenly distributed on the radial outside of the impeller, each movable guide vane is in an open state, and a water flow gap is formed between adjacent movable guide vanes; each movable guide vane is in a closed state, and a portion of the suction surface of each movable guide vane is completely in contact with a portion of the pressure surface of the adjacent movable guide vane.

[0016] The movable guide vanes of the water turbine provided in the embodiment of the present application have an inlet end and an outlet end arranged relative to each other along the direction of water flow. The water flow of the water turbine flows from the inlet end of the movable guide vanes to the outlet end, and then flows to the runner of the water turbine. The movable guide vanes include a pressure surface and a suction surface. The suction surface is arranged on one side of the pressure surface along a first direction, and the first direction intersects with the direction of water flow. The pressure surface and the suction surface are connected to an arc-shaped edge line at the outlet end. In the direction of water flow, the arc-shaped edge line convexly bends toward the direction close to the inlet end, thereby forming a concave space at the outlet end, which is conducive to increasing the distance of the bladeless area of the water turbine, reducing the dynamic and static interference between the movable guide vanes and the runner, thereby reducing the pressure pulsation in the bladeless area and improving the hydraulic characteristics of the water turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a structural diagram of a water turbine provided in one embodiment of the present application.

[0019] Figure 2 This is a schematic structural diagram of a movable guide vane provided in one embodiment of the present application.

[0020] Figure 3 yes Figure 2 The schematic diagram of the structure of the movable guide vane is shown in another orientation.

[0021] Figure 4 yes Figure 2 The structure diagram of the movable guide vane shown is in a top view.

[0022] Figure 5 yes Figure 2 The structure diagram of the movable guide vane shown is in the right view state. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0025] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0027] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0028] The term "plurality" used in this application refers to two or more (including two).

[0029] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0030] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.

[0032] The movable guide vanes provided in the embodiments of the present application can be applied to a water turbine.

[0033] Figure 1 This is a schematic diagram of the structure of a water turbine provided by an embodiment of the present application. Figure 1The water turbine 1000 includes movable guide vanes 100 and a runner 200. The movable guide vanes 100 are arranged radially outward from the runner 200 and spaced apart from the radially outer edge of the runner 200. A bladeless area is formed between the movable guide vanes 100 and the runner 200.

[0034] Optionally, there are multiple movable guide vanes 100 , and the multiple movable guide vanes 100 are arranged around the radial outer side of the runner 200 .

[0035] The water turbine 1000 may further include a plurality of fixed guide vanes 300, which are disposed around the plurality of movable guide vanes 100. The movable guide vanes 100 are closer to the runner 200 than the fixed guide vanes 300.

[0036] It can be understood that the plurality of fixed guide vanes 300 and the plurality of movable guide vanes 100 respectively form two rings, wherein the ring formed by the movable guide vanes 100 is located inside the ring formed by the fixed guide vanes 300 .

[0037] The water turbine 1000 may further include a volute 400 , which is used to evenly distribute the water flow around the runner 200 .

[0038] The water turbine 1000 further includes a top cover and a bottom ring, and the movable guide vanes 100 are arranged between the top cover and the bottom ring.

[0039] Figure 2 This is a schematic diagram of the structure of the movable guide vane provided by an embodiment of the present application. Figure 3 yes Figure 2 The schematic diagram of the structure of the movable guide vane in another orientation is shown. Figure 4 yes Figure 2 The structure diagram of the movable guide vane in the top view is shown in FIG. Figures 2 to 4 The movable guide vane 100 provided in an embodiment of the present application includes an inlet end 100a and an outlet end 100b, which are arranged opposite each other along the water flow direction X. The outlet end 100b is adjacent to and spaced from the runner 200. The movable guide vane 100 includes a pressure surface 10 and a suction surface 20. The suction surface 20 is disposed on one side of the pressure surface 10 along a first direction Y, which intersects the water flow direction X. The pressure surface 10 and the suction surface 20 are connected at the outlet end 100b by an arcuate edge 30. In the water flow direction X, the arcuate edge 30 is convex and curved toward the inlet end 100a.

[0040] It will be understood that the inlet end 100a is the end where water flows into the movable guide vane 100, and the outlet end 100b is the end where water flows out of the movable guide vane 100. The water flow direction X is the direction from the inlet end 100a to the outlet end 100b. After the movable guide vane 100 is applied to the turbine 1000, the inlet end 100a is positioned adjacent to the fixed guide vane 300, and the outlet end 100b is positioned adjacent to the runner 200 and spaced apart from it.

[0041] The movable guide vane 100 may further include a first end surface 40 and a second end surface 50. The first end surface 40 and the second end surface 50 are arranged opposite each other along a second direction Z. The second direction Z may be parallel to the axis of the runner 200. The water flow direction X, the first direction Y, and the second direction Z intersect in pairs. The first end surface 40 and the second end surface 50 can be understood as the top and bottom surfaces of the movable guide vane 100.

[0042] Optionally, the water flow direction X, the first direction Y, and the second direction Z may be perpendicular to each other.

[0043] The pressure surface 10 and the suction surface 20 are connected between the first end surface 40 and the second end surface 50. The pressure surface 10 and the first end surface 40, the pressure surface 10 and the second end surface 50, the suction surface 20 and the first end surface 40, and the suction surface 20 and the second end surface 50 intersect at a side line.

[0044] Exemplarily, one of the first end surface 40 and the second end surface 50 is a hub surface of the movable guide vane 100 , and the other is a rim surface of the movable guide vane 100 .

[0045] Optionally, the first end surface 40 and the second end surface 50 may be planes. In this case, the first plane a may be perpendicular to the first end surface 40 and the second end surface 50 .

[0046] Optionally, the pressure surface 10 and the suction surface 20 may be smoothly connected at the inlet end 100a, thereby reducing water flow resistance at the inlet end 100a and lowering hydraulic losses. As other examples, the pressure surface 10 and the suction surface 20 may also be connected at a ridgeline at the inlet end 100a, or the pressure surface 10 and the suction surface 20 may be connected via a connecting surface located at the inlet end 100a.

[0047] At the outflow end 100b, the pressure surface 10 and the suction surface 20 are connected by an arcuate edge line 30. The arcuate edge line 30 serves as both the end edge line of the pressure surface 10 at the outflow end 100b and the end edge line of the suction surface 20 at the outflow end 100b. The ends of the arcuate edge line 30 are connected to the first end surface 40 and the second end surface 50, respectively. The arcuate edge line 30 intersects the first end surface 40 at a first intersection point, and the arcuate edge line 30 intersects the second end surface 50 at a second intersection point.

[0048] In the direction of water flow X, the arcuate edge 30 curves convexly toward the inlet end 100a. In other words, the projection of the arcuate edge 30 on a first plane is a first arc, and the first plane is perpendicular to the first direction Y. The first arc curves convexly toward the projection of the inlet end 100a on the first plane. This creates a recessed space at the outlet end 100b, which helps increase the distance to the bladeless region of a turbine equipped with the movable guide vanes 100, reduces the dynamic and static interference between the movable guide vanes 100 and the turbine runner, and thus reduces pressure pulsation in the bladeless region and improves the turbine's hydraulic characteristics.

[0049] In some embodiments, the arcuate edge lines 30 are symmetrically arranged about a bisecting plane b of the movable guide vane 100 in the second direction Z, and the second direction Z, the first direction Y, and the water flow direction X intersect with each other.

[0050] The bisecting plane b bisects the movable guide vane 100 along the second direction Z.

[0051] The bisecting plane b is a plane located between the first end face 40 and the second end face 50. Optionally, the first end face 40 and the second end face 50 are parallel planes to each other, and the bisecting plane b is parallel to the first end face 40 and the second end face 50.

[0052] The arcuate edge 30 is symmetrically arranged about the bisector plane b, so that the arcuate edge is a symmetrical arc shape, so that the distance between the center position of the arcuate edge 30 and the radial outer edge of the runner is maximized, effectively reducing the dynamic and static interference between the movable guide vanes and the runner, thereby effectively reducing the pressure pulsation in the bladeless area under some operating conditions and the hydraulic excitation force on the top cover.

[0053] In some embodiments, two opposing ends of the arcuate edge along the second direction Z are aligned in the water flow direction X, and the second direction Z, the first direction Y, and the water flow direction X intersect in pairs. In the water flow direction X, a first distance ΔL is defined between the highest point of the arcuate edge protruding toward the inlet end 100a and the end of the arcuate edge. When the movable guide vane 100 is at its rated opening, a second distance L is defined between the end of the arcuate edge 30 and the radially outer edge of the runner 200. ΔL and L satisfy the following relationship: ΔL / L = 0.1 to 0.3.

[0054] Illustratively, the ratio between the first distance ΔL and the second distance L may be 0.10, 0.12, 0.14, 0.16, 0.18, 0.20, 0.22, 0.24, 0.26, 0.28, or 0.30.

[0055] It should be noted that for a hydraulic turbine with a rated head, the movable guide vanes 100 of the hydraulic turbine have a corresponding rated opening. The rated opening of the movable guide vanes 100 can be a single opening value or can include multiple opening values. When the movable guide vanes 100 are at any opening value within the rated opening value, the ratio of ΔL to L is between 0.1 and 0.3.

[0056] The highest point of the arcuate edge protruding toward the inlet end 100a is the point on the arcuate edge closest to the inlet end 100a, and is also the point on the arcuate edge 30 farthest from the runner.

[0057] Since the two ends of the arcuate edge are arranged flush in the water flow direction X, the distances between the highest point of the arcuate edge protruding toward the inlet end 100a and the two ends of the arcuate edge are equal in the water flow direction X, both being the first distance ΔL.

[0058] Optionally, the arc-shaped edge line may be a symmetrical arc line, and the highest point of the arc-shaped edge line protruding toward the inlet end 100a is the center position point of the arc-shaped edge line.

[0059] In this embodiment of the present application, the ratio between the first distance ΔL and the second distance L is set to be greater than or equal to 0.1. The degree to which the curved edge 30 protrudes toward the inlet end 100a is sufficient to effectively increase the distance between the movable guide vane 100 and the runner, thereby effectively reducing pressure pulsation in the vaneless area. In this embodiment of the present application, the ratio between the first distance ΔL and the second distance L is set to be less than or equal to 0.3. The degree to which the curved edge 30 protrudes toward the inlet end 100a is not excessive, thereby facilitating the movable guide vane 100 to control the angle of water flow toward the runner, thereby facilitating improved energy conversion efficiency.

[0060] In the embodiment of the present application, the ratio between the first distance ΔL and the second distance L is set between 0.1 and 0.3, so that the degree of protrusion of the arc edge 30 toward the inlet end 100a is relatively appropriate, thereby achieving a balance between reducing the pressure pulsation in the bladeless area and improving the energy conversion efficiency.

[0061] Figure 5 yes Figure 2 The structure diagram of the movable guide vane in the right view state is shown. In some embodiments, referring to Figure 2 and Figure 5 In the first direction Y, the arcuate edge line 30 is convexly curved toward the direction close to the pressure surface 10.

[0062] The projection of the arc edge 30 in the second plane is a second arc line. The second plane is perpendicular to the water flow direction X. The second arc line convexly curves along the first direction Y toward the projection of the pressure surface 10 in the second plane.

[0063] The second plane is perpendicular to the first plane.

[0064] The two ends of the arc edge are arranged opposite to each other along the second direction Z.

[0065] The curved edge 30 is an arc that curves convexly not only along the water flow direction X toward the inlet end 100a, but also along the first direction Y toward the pressure surface 10. As a result, the suction surface 20 forms a larger clearance space at the outlet end 100b, facilitating smooth water flow, improving the flow path and flow pattern in the vaneless area of the movable guide vane 100, and reducing hydraulic losses after the water passes through the movable guide vane 100.

[0066] In some embodiments, the ends of the arcuate edge are aligned along the first direction Y. In the first direction Y, a third distance Δh is defined between the highest point of the arcuate edge protruding toward the pressure surface 10 and the ends of the arcuate edge. In the water flow direction X, a second distance L is defined between the end of the arcuate edge 30 and the radially outer edge of the runner 200 . Δh and L satisfy the following relationship: Δh / L = 0.05 to 0.2.

[0067] Illustratively, the ratio between the third distance Δh and the second distance L may be 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19 or 0.20.

[0068] Optionally, the arc-shaped edge line may be a symmetrical arc line, and the highest point of the arc-shaped edge line protruding toward the pressure surface 10 may be the center position point of the arc-shaped edge line.

[0069] Since both ends of the arcuate edge are aligned along the first direction Y, in the first direction Y, the distances between the highest point of the arcuate edge protruding toward the pressure surface 10 and the two ends of the arcuate edge are equal, both being the third distance Δh.

[0070] In the embodiment of the present application, the ratio between the third distance Δh and the second distance L is set to be greater than or equal to 0.05, which can ensure the spatial distortion of the movable guide vane 100, so that the water flows more in the middle of the suction surface 20 along the second direction Z, reduces the phenomenon of water flowing toward the top cover along the second direction Z, improves the mainstream flow state in the flow channel of the movable guide vane 100, and reduces the hydraulic excitation force on the top cover; in the embodiment of the present application, the ratio between the third distance Δh and the second distance L is set to be less than or equal to 0.2, which can avoid excessive distortion causing most of the water flow to converge in the middle of the suction surface 20 along the second direction Z to produce a strong impact on the movable guide vane 100, improves the balance of water flow, and reduces the difficulty of processing and manufacturing while ensuring effective improvement of the mainstream flow state in the flow channel of the movable guide vane.

[0071] In some embodiments, at least a portion of the suction surface 20 is convexly curved toward the pressure surface 10 .

[0072] For example, the suction surface 20 may be convexly curved toward the pressure surface 10 as a whole, and the suction surface 20 may be concave as a whole.

[0073] As another example, only a portion of the suction surface 20 is convexly curved toward the pressure surface 10. In this case, the suction surface 20 may include a first portion and a second portion distributed along the water flow direction X; the first portion is smoothly connected to the pressure surface 10, and the second portion is connected to the arc-shaped edge 30 and convexly curved toward the pressure surface 10.

[0074] Optionally, the pressure surface 10 may be a convex surface that protrudes along the first direction Y toward a direction away from the suction surface 20 .

[0075] In the embodiment of the present application, at least a portion of the suction surface 20 is configured to be convexly curved toward the pressure surface 10, so that the water flow can flow more in the middle portion of the suction surface 20 along the second direction Z, reducing the phenomenon of water flow toward the top cover along the second direction Z, further improving the mainstream flow state in the flow channel of the movable guide vane 100, and reducing the hydraulic excitation force on the top cover.

[0076] In some embodiments, the curvature of at least a portion of the suction surface 20 gradually increases in the water flow direction X from the inlet end 100 a to the outlet end 100 b .

[0077] For example, the suction surface 20 as a whole convexly curves toward the pressure surface 10. The area of the suction surface 20 near the inlet end 100a convexly curves toward the pressure surface 10 to the least extent, and the area of the suction surface 20 near the outlet end 100b convexly curves toward the pressure surface 10 to the greatest extent.

[0078] As another example, only the second portion of the suction surface 20 convexly curves toward the pressure surface 10, the area of the second portion close to the inlet end 100a convexly curves toward the pressure surface 10 to the least extent, and the area of the second portion close to the outlet end 100b convexly curves toward the pressure surface 10 to the greatest extent.

[0079] In some embodiments, the suction surface 20 is symmetrically arranged with respect to a plane b bisecting the movable guide vane 100 in the second direction Z.

[0080] The bisecting plane b bisects the movable guide vane 100 along the second direction Z.

[0081] The bisecting plane b is a plane located between the first end face 40 and the second end face 50. Optionally, the first end face 40 and the second end face 50 are parallel planes to each other, and the bisecting plane b is parallel to the first end face 40 and the second end face 50.

[0082] The suction surface 20 is symmetrically arranged about the bisecting plane b, which not only reduces the difficulty of processing and installation, but also makes the restriction effect of the suction surface 20 on the water flow on both sides along the second direction Z more balanced, further reducing the flow of water in the movable guide vane 100 toward the top cover and the bottom ring.

[0083] In some embodiments, the end region of the suction surface 20 adjacent to the outflow end 100 b matches the shape of the end region of the pressure surface 10 adjacent to the inflow end 100 a .

[0084] Optionally, the end region of the suction surface 20 adjacent to the outflow end 100b may be a convex surface, and the end region of the pressure surface 10 adjacent to the inflow end 100a may be a concave surface matching the convex surface.

[0085] When a plurality of movable guide vanes 100 are provided in a water turbine and the movable guide vanes 100 are in a closed state, an end region of the suction surface 20 of the movable guide vane 100 adjacent to the outflow end 100b can cooperate with an end region of the pressure surface 10 of an adjacent movable guide vane 100 adjacent to the inflow end 100a, thereby reducing or even eliminating the gap between adjacent movable guide vanes 100 and improving the closing effect of the movable guide vanes 100. At this time, the water flow rate flowing through the movable guide vane 100 is close to zero, and the sealing performance is good.

[0086] According to the second aspect of the present application, the embodiment of the present application further provides a turbine 1000, referring to Figure 1 The water turbine 1000 provided in the embodiment of the present application includes a runner 200 and the movable guide vanes 100 provided in any of the above embodiments. The movable guide vanes 100 are provided on the radially outer side of the runner 200.

[0087] The runner 200 may include an upper crown and a lower ring, and the movable guide vane 100 may be disposed radially outside the upper crown.

[0088] In the turbine 1000 provided in the embodiment of the present application, the distance between the bladeless area between the movable guide vanes 100 and the runner 200 is large, which weakens the dynamic and static interference between the movable guide vanes 100 and the turbine runner, thereby reducing the pressure pulsation in the bladeless area and improving the hydraulic characteristics of the turbine 1000.

[0089] In some embodiments, there are multiple movable guide vanes 100. The multiple movable guide vanes 100 are evenly distributed radially outside the runner 200. When each movable guide vane 100 is in an open state, a water flow gap is formed between adjacent movable guide vanes 100. When each movable guide vane 100 is in a closed state, a portion of the suction surface 20 of each movable guide vane 100 is completely aligned with a portion of the pressure surface 10 of an adjacent movable guide vane 100.

[0090] Optionally, the plurality of movable guide vanes 100 may be distributed on a circular ring surrounding the runner 200 , and the central angle formed between adjacent movable guide vanes 100 may be 5° to 15°.

[0091] It can be understood that the movable guide vane 100 may have multiple operating states. In different operating states, the movable guide vane 100 rotates at different angles relative to the closed state.

[0092] When the movable guide vanes 100 are in the closed state, a portion of the suction surface 20 of each movable guide vane 100 is completely in contact with a portion of the pressure surface 10 of an adjacent movable guide vane 100, thereby eliminating the gaps between adjacent movable guide vanes 100 and improving the closing effect of the movable guide vanes 100. At this time, the water flow rate flowing through the movable guide vanes 100 is close to zero, thereby improving the sealing performance.

[0093] An embodiment of the present application provides a movable guide vane 100, comprising an inlet end 100a and an outlet end 100b disposed opposite each other along a water flow direction X. The outlet end 100b is adjacent to and spaced from a runner 200. The movable guide vane 100 comprises a pressure surface 10 and a suction surface 20. The suction surface 20 is disposed on one side of the pressure surface 10 along a first direction Y, which intersects the water flow direction X. The pressure surface 10 and the suction surface 20 are connected at the outlet end 100b by an arcuate edge line 30. In the water flow direction X, the arcuate edge line 30 convexly curves toward the inlet end 100a. In the first direction Y, the arcuate edge line 30 convexly curves toward the pressure surface 10. The arcuate edge line 30 is symmetrically disposed about a plane b that bisects the movable guide vane 100 in a second direction Z. At least a portion of the suction surface 20 convexly curves toward the pressure surface 10. The suction surface 20 is symmetrically arranged with respect to a plane b bisecting the movable guide vane 100 in the second direction Z. Thus, the movable guide vane 100 may have a symmetrical arched structure.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A movable guide vane of a water turbine, the water turbine comprising a runner, the movable guide vane being arranged radially outward of the runner, characterized in that: The movable guide vane includes an inlet end and an outlet end which are arranged opposite to each other along the water flow direction, and the outlet end is adjacent to and spaced from the runner; The movable guide vane includes a pressure surface and a suction surface, wherein the suction surface is provided on one side of the pressure surface along a first direction, wherein the first direction intersects the water flow direction; the pressure surface and the suction surface are connected to an arcuate edge line at the outflow end, and in the water flow direction, the arcuate edge line convexly curves toward the inflow end; In the first direction, the arcuate edge curves convexly toward the pressure surface, and at least a portion of the suction surface curves convexly toward the pressure surface.

2. The movable guide vane according to claim 1, characterized in that: The arcuate edge lines are symmetrically arranged with respect to a plane bisecting the movable guide vane in the second direction, and the second direction, the first direction and the water flow direction intersect with each other.

3. The movable guide vane according to claim 1, characterized in that: Two opposite ends of the arc-shaped edge along the second direction are arranged flush in the water flow direction, and the second direction, the first direction and the water flow direction intersect each other; In the water flow direction, a first distance between the highest point of the arcuate edge protruding toward the inlet end and the end of the arcuate edge is ΔL. When the movable guide vane is at the rated opening, a second distance between the end of the arcuate edge and the radial outer edge of the runner is L. ΔL and L satisfy: ΔL / L=0.1~0.

3.

4. The movable guide vane according to claim 1, characterized in that: The two ends of the arc-shaped edge are arranged flush along the first direction; In the first direction, the third distance between the highest point of the arc-shaped edge protruding toward the pressure surface and the two ends of the arc-shaped edge is Δh; in the water flow direction, the second distance between the end of the arc-shaped edge and the radial outer edge of the runner is L, and Δh and L satisfy: Δh / L=0.05~0.

2.

5. The movable guide vane according to claim 1, characterized in that: In the water flow direction from the inlet end to the outlet end, the curvature of at least a portion of the suction surface gradually increases.

6. The movable guide vane according to claim 1, characterized in that: The suction surface is symmetrically arranged with respect to a plane bisecting the movable guide vane in the second direction, and the second direction, the first direction and the water flow direction intersect with each other.

7. The movable guide vane according to claim 1, characterized in that: The shape of an end region of the suction surface adjacent to the outflow end matches the shape of an end region of the pressure surface adjacent to the inflow end.

8. A water turbine, characterized in that: include: Wheel; as well as According to any one of claims 1 to 7, the movable guide vane is arranged on the radial outside of the runner.

9. The water turbine according to claim 8, characterized in that There are multiple movable guide vanes; The plurality of movable guide vanes are evenly distributed on the radially outer side of the runner, and when the movable guide vanes are in an open state, a water flow gap is formed between adjacent movable guide vanes; when the movable guide vanes are in a closed state, a portion of the suction surface of each movable guide vane is completely in contact with a portion of the pressure surface of the adjacent movable guide vane.

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