Water guide mechanism and water pump turbine

Abstract

The present application provides a water guide mechanism and a water pump turbine, wherein the water guide mechanism includes a top cover, a bottom ring, and a plurality of movable guide vanes. The plurality of movable guide vanes are disposed between the top cover and the bottom ring, are rotatably connected to the top cover and the bottom ring, and are spaced circumferentially along the top cover and the bottom ring. The movable guide vanes can be opened and closed synchronously about a rotation axis. The movable guide vanes have a high-pressure side placement angle and a low-pressure side placement angle. The guide vane profiles of two circumferentially adjacent movable guide vanes are different. When the two circumferentially adjacent movable guide vanes are in the open state, the high-pressure side placement angles of the two circumferentially adjacent movable guide vanes are different and / or the low-pressure side placement angles of the two circumferentially adjacent movable guide vanes are different. The present application aims to increase the hump margin of the water pump turbine and improve the "S" characteristic, thereby improving the operational stability of the water pump turbine.

Description

Technical Field

[0001] The present application relates to the technical field of fluid machinery, and in particular to a water guide mechanism and a water pump turbine. Background Art

[0002] Pumped-storage hydropower units offer a variety of functions, including peak-load shifting, frequency and phase modulation, energy storage, emergency backup, and black start. They are crucial for building new power systems, ensuring their stable operation, and enabling the large-scale development of renewable energy. As the core component of a pumped-storage power station, the energy performance and stability of the pump-turbine are directly related to the safe and stable operation of the power station.

[0003] Guide vanes are crucial water-guiding components in pump-turbines, playing a crucial role in the unit's energy performance and stability. Existing pump-turbine systems typically have an even number of guide vanes, between 16 and 24, distributed evenly around the periphery of the runner. Each guide vane has identical profiles. During unit operation, the guide vanes rotate around their axis, opening and closing synchronously to control water flow. However, in existing technologies, the hump margin and "S" characteristic of pump-turbines are significant factors affecting stable operation. Summary of the Invention

[0004] The present application provides a water guide mechanism and a pump-turbine, aiming to increase the hump margin of the pump-turbine, improve the "S" characteristic, and thus improve the operating stability of the pump-turbine.

[0005] This application proposes a water diversion mechanism, comprising:

[0006] Top cover and bottom ring;

[0007] A plurality of movable guide vanes are arranged between the top cover and the bottom ring, and are rotatably connected to the top cover and the bottom ring, and are arranged at intervals along the circumference of the top cover and the bottom ring; the movable guide vanes can be opened and closed synchronously around the rotation axis; the movable guide vanes have a high-pressure side placement angle and a low-pressure side placement angle; wherein, the guide vane profiles of two circumferentially adjacent movable guide vanes are different; when the two circumferentially adjacent movable guide vanes are in the open state, the high-pressure side placement angles of the two circumferentially adjacent movable guide vanes are different and / or the low-pressure side placement angles of the two circumferentially adjacent movable guide vanes are different.

[0008] Optionally, the plurality of movable guide vanes include a plurality of first movable guide vanes and a plurality of second movable guide vanes; the first movable guide vanes and the second movable guide vanes have different guide vane profiles; and one second movable guide vane is provided between two circumferentially adjacent first movable guide vanes;

[0009] The first movable guide vane has a first high-pressure side placement angle and a first low-pressure side placement angle, and the second movable guide vane has a second high-pressure side placement angle and a second low-pressure side placement angle;

[0010] When the circumferentially adjacent first and second movable guide vanes are in an open state, the first high-pressure side placement angle is different from the second high-pressure side placement angle and / or the first low-pressure side placement angle is different from the second low-pressure side placement angle.

[0011] Optionally, when the circumferentially adjacent first movable guide vane and second movable guide vane are in the open state, the first high-pressure side placement angle and the second high-pressure side placement angle are different, and the first low-pressure side placement angle and the second low-pressure side placement angle are the same.

[0012] Optionally, when the circumferentially adjacent first movable guide vane and second movable guide vane are in the open state, the first high-pressure side placement angle and the second high-pressure side placement angle are the same, and the first low-pressure side placement angle and the second low-pressure side placement angle are different.

[0013] Optionally, when the circumferentially adjacent first and second movable guide vanes are in an open state, the first high-pressure side placement angle is different from the second high-pressure side placement angle, and the first low-pressure side placement angle is different from the second low-pressure side placement angle.

[0014] Optionally, the movable guide vane includes a blade and a rotating shaft, the blade is fixed on the rotating shaft, and the rotating shaft is rotatably connected to the top cover and the bottom ring;

[0015] The blade has a high-pressure edge and a low-pressure edge arranged opposite to each other in the circumferential direction of the top cover and the bottom ring, and an inner side edge and an outer side edge connecting the high-pressure edge and the low-pressure edge; the inner side edge has a first profile line, and the outer side edge has a second profile line;

[0016] Wherein, the first profile lines and / or the second profile lines of two circumferentially adjacent movable guide vanes are different.

[0017] Optionally, in a projection plane perpendicular to the axial direction of the top cover, a rotation shaft of two circumferentially adjacent movable guide vanes is located between the inner and outer edges of its corresponding blade, and part of the circumference of the other rotation shaft protrudes beyond the inner and outer edges of its corresponding blade.

[0018] Optionally, the high-pressure side has a first endpoint of the movable guide vane, and a line connecting the first endpoint and the axis of the top cover and the bottom ring is a first connecting line; the first connecting line has a first normal line, and the high-pressure side has a second normal line passing through the first endpoint, and an angle between the first normal line and the second normal line is the high-pressure side placement angle;

[0019] The low-pressure side has a second endpoint of the movable guide vane; the line connecting the second endpoint and the axis of the top cover and the bottom ring is the second line; the second line has a third normal, and the low-pressure side has a fourth normal passing through the second endpoint, and the angle between the third normal and the fourth normal is the low-pressure side placement angle.

[0020] Optionally, the distance between the first end point and the axis of the top cover and the bottom ring is a first distance; the distance between the second end point and the axis of the top cover is a second distance;

[0021] The first distances between two circumferentially adjacent movable guide vanes are different and / or the second distances between two circumferentially adjacent movable guide vanes are different.

[0022] Optionally, the present application also proposes a water pump turbine, comprising the water guide mechanism as described above.

[0023] Compared to conventional guide vanes with identical profiles and placement angles, the technical solution proposed in this application features two adjacent guide vanes with different structures and circumferential spacing. Specifically, the adjacent guide vanes have different placement angles and profiles, thereby controlling non-uniform water flow, increasing the pump-turbine's hump margin, improving the S characteristic, and enhancing unit stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 Schematic diagram of the three-dimensional structure of the water guide mechanism provided in an embodiment of the present application;

[0026] Figure 2 Detailed structural diagram of the movable guide vane in the embodiment of the present application;

[0027] Figure 3 Schematic diagram of the arrangement structure of the movable guide vanes in the embodiment of the present application;

[0028] Figure 4 It is a detailed structural diagram of adjacent movable guide vanes in an embodiment of the present application.

[0029] Reference Signs List

[0030]

[0031] DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0034] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to make and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art will recognize that the invention can be practiced without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0035] The movable guide vanes are important water-guiding components of the pump-turbine and play an important role in the energy performance and stability of the unit. The water-guiding mechanism of the existing pump-turbine usually includes movable guide vanes, a top cover and a bottom ring. The movable guide vanes are rotatably mounted on the top cover and the bottom ring. The number of movable guide vanes is usually an even number between 16 and 24, and is arranged at intervals along the circumference of the top cover and the bottom ring so as to be evenly distributed on the periphery of the runner. The profiles of the movable guide vanes are exactly the same. When the unit is running, the guide vanes rotate around their rotation axis and open or close synchronously to achieve the function of controlling the water flow. However, in the prior art, the water flow at the movable guide vanes of the pump-turbine changes evenly in the circumferential direction, resulting in the hump margin and the "S" characteristic being important factors affecting the stable operation of the unit.

[0036] To this end, this application proposes a water guide mechanism, which aims to increase the hump margin, improve the "S" characteristic, and achieve the purpose of improving the stability of the water pump turbine unit. Figure 1 and Figure 2 As shown, the present application proposes a water guide mechanism, comprising:

[0037] Top cover 100 and bottom ring 200;

[0038] A plurality of movable guide vanes 300 are provided between the top cover 100 and the bottom ring 200, and are rotatably connected to the top cover 100 and the bottom ring 200, and are arranged at intervals along the circumference of the top cover 100 and the bottom ring 200; the movable guide vanes 300 can be synchronously opened and closed around the rotation axis; the movable guide vanes 300 have a high-pressure side placement angle A and a low-pressure side placement angle B; wherein, the guide vane profiles of two circumferentially adjacent movable guide vanes 300 are different; when the two circumferentially adjacent movable guide vanes 300 are in the open state, the high-pressure side placement angles A of the two circumferentially adjacent movable guide vanes 300 are different and / or the low-pressure side placement angles B of the two circumferentially adjacent movable guide vanes 300 are different.

[0039] Compared to conventional movable guide vanes 300 with identical profiles and placement angles, the technical solution proposed in this application features two adjacent movable guide vanes 300 with different structures, and the movable guide vanes 300 are spaced apart in the circumferential direction. Specifically, the adjacent movable guide vanes 300 have different placement angles and profiles, thereby controlling non-uniform water flow, increasing the pump-turbine's hump margin, improving the S characteristic, and enhancing the unit's stability.

[0040] It should be noted that the movable guide vane 300 is an important water-guiding component in the pump-turbine, and has two working states: open and closed. The switching structure of the movable guide vane 300 between the open and closed states is not the focus of improvement in this application, and the well-known technology in the field can be adopted, and will not be described in detail here. Furthermore, it should be noted that in the technical solution of this application, there are structural differences between two adjacent movable guide vanes 300, but generally speaking, two adjacent movable guide vanes 300 (all movable guide vanes 300) are in the same open state or closed state.

[0041] Reference Figure 2 Each movable guide vane 300 includes a rotating shaft 302 and a blade 301. The blade 301 is fixed to the rotating shaft 302. The rotating shaft 302 is rotatably mounted on the top cover 100 and the bottom ring 200. The blade 301 includes a high-pressure edge L1, a low-pressure edge L2, an inner edge L4, and an outer edge L3. The high-pressure edge L1, the inner edge L4, the low-pressure edge L2, and the outer edge L3 enclose and define the blade 301.

[0042] The outer side L3 faces away from the axis of the top cover 100. The inner side L4 faces the axis of the top cover 100. The high-pressure side L1 is away from the axis O of the top cover 100, and the low-pressure side L2 is close to the axis O of the top cover 100. In the projection of the blade 301 on the top cover 100, the line type of the inner side L4 and the outer side L3 is the guide vane line. Among them, the guide vane line corresponding to the inner side L4 is the first line, and the guide vane line corresponding to the outer side L3 is the second line. The guide vane line can be a straight line, a curve, or a combination of a straight line segment and a curve segment. The shape of the guide vane line is set according to the specific situation, and it is generally set to a parabola, a hyperbola, an elliptical arc, or the like.

[0043] The high-pressure side L1 has a first endpoint P1 of the movable guide vane 300, and a line connecting the first endpoint P1 and the axis O of the top cover 100 and the bottom ring 200 is a first line; the first line has a first normal, and the high-pressure side L1 has a second normal passing through the first endpoint P1, and the angle between the first normal and the second normal is the high-pressure side placement angle A; the low-pressure side L2 has a second endpoint P2 of the movable guide vane 300; a line connecting the second endpoint P2 and the axis O of the top cover 100 is a second line; the second line has a third normal, and the low-pressure side L2 has a fourth normal passing through the second endpoint P2, and the angle between the third normal and the fourth normal is the low-pressure side placement angle B.

[0044] In this embodiment, the first endpoint P1 is the point on the high-pressure side L1 that is farthest from the axis of the rotation axis 302 of the movable guide vane 300 on which it is located. The second endpoint P2 is the point on the low-pressure side L2 that is farthest from the axis of the rotation axis 302 of the movable guide vane 300 on which it is located. The distance between the first endpoint P1 and the second endpoint P2 is the maximum distance between any two points on the movable guide vane 300 on which they are located.

[0045] As an optional implementation of the above embodiment, Figure 3 and Figure 4 As shown, the plurality of movable guide vanes 300 include a plurality of first movable guide vanes 310 and a plurality of second movable guide vanes 320. The first movable guide vanes 310 and the second movable guide vanes 320 have different guide vane profiles. A second movable guide vane 320 is disposed between two circumferentially adjacent first movable guide vanes 310. In an embodiment, the plurality of first movable guide vanes 310 are circumferentially spaced apart, with the same profile and placement angle, forming a first group of movable guide vanes. The plurality of second movable guide vanes 320 are circumferentially spaced apart, with the same profile and placement angle, forming a second group of movable guide vanes. A second movable guide vane 320 is disposed between two adjacent first movable guide vanes 310.

[0046] In an embodiment, generally speaking, the axis of the first movable guide vane 310 and the axis of the second movable guide vane 320 are located on the same circumference. In some optional embodiments, the axis of the first movable guide vane 310 can be set on the first circumference, and the axis of the second movable guide vane 320 can be set on the second circumference.

[0047] The first movable guide vane 310 has a first high-pressure side placement angle A1 and a first low-pressure side placement angle B1, and the second movable guide vane 320 has a second high-pressure side placement angle A2 and a second low-pressure side placement angle B2. When the circumferentially adjacent first and second movable guide vanes 310 and 320 are in the open state, the first high-pressure side placement angle A1 and the second high-pressure side placement angle A2 are different and / or the first low-pressure side placement angle B1 and the second low-pressure side placement angle B2 are different.

[0048] For example, in some embodiments, when the circumferentially adjacent first and second movable guide vanes 310 and 320 are in the open state, the first high-pressure side placement angle A1 and the second high-pressure side placement angle A2 are different, while the first low-pressure side placement angle B1 and the second low-pressure side placement angle B2 are the same. In this embodiment, by setting the high-pressure side placement angle A of the first set of movable guide vanes and the high-pressure side placement angle A of the second set of movable guide vanes to be different, the hump margin is increased, thereby improving the "S" characteristic.

[0049] For example, in some embodiments, when the circumferentially adjacent first and second movable guide vanes 310 and 320 are in the open state, the first high-pressure side angle A1 and the second high-pressure side angle A2 are the same, while the first low-pressure side angle B1 and the second low-pressure side angle B2 are different. In this embodiment, by setting the low-pressure side angle B of the first set of movable guide vanes different from the low-pressure side angle B of the second set of movable guide vanes, the hump margin is increased, thereby improving the "S" characteristic.

[0050] For another example, in some embodiments, when the circumferentially adjacent first and second movable guide vanes 310 and 320 are in the open state, the first high-pressure side placement angle A1 and the second high-pressure side placement angle A2 are different, and the first low-pressure side placement angle B1 and the second low-pressure side placement angle B2 are different. In this embodiment, by setting the high-pressure side placement angle A of the first set of movable guide vanes and the high-pressure side placement angle A of the second set of movable guide vanes different, and setting the low-pressure side placement angle B of the first set of movable guide vanes and the low-pressure side placement angle B of the second set of movable guide vanes different, the hump margin and the "S" characteristic are increased.

[0051] As a technical solution of the above embodiment, the first profiles and / or second profiles of two circumferentially adjacent movable guide vanes 300 are different. For example, the first profile of the first movable guide vane 310 is different from the first profile of the second movable guide vane 320, and the second profile of the first movable guide vane 310 is different from the second profile of the second movable guide vane 320; the first profile of the first movable guide vane 310 is different from the first profile of the second movable guide vane 320, and the second profile of the first movable guide vane 310 is the same as the second profile of the second movable guide vane 320; the first profile of the first movable guide vane 310 is the same as the first profile of the second movable guide vane 320, and the second profile of the first movable guide vane 310 is different from the second profile of the second movable guide vane 320. In this embodiment, by setting the first profile of the first group of movable guide vanes and the first profile of the second group of movable guide vanes to be different and / or setting the second profile of the first group of movable guide vanes and the second profile of the first group of movable guide vanes to be different, the purpose of increasing the hump margin and improving the "S" characteristic is achieved.

[0052] For example, the first profile of the first movable guide vane 310 is a first parabola, and the first profile of the second movable guide vane 320 is a second parabola; the second profile of the first movable guide vane 310 is a third parabola, and the second profile of the second movable guide vane 320 is a fourth parabola.

[0053] As an optional implementation of the above embodiment, Figure 4As shown, in a projection plane perpendicular to the axial direction of the top cover 100, the rotation axis 302 of one of the two circumferentially adjacent movable guide vanes 300 is located between the inner side L4 and outer side L3 of its corresponding blade 301, while a portion of the circumferential edge of the other rotation axis 302 protrudes beyond the inner side L4 and outer side L3 of its corresponding blade 301. For example, the projection of the rotation axis 302 of the second movable guide vane 320 is located within the space defined by the inner side L4 and outer side L3 of its corresponding blade 301; while a portion of the circumferential edge of the projection of the rotation axis 302 of the first movable guide vane 310 protrudes beyond both the inner side L4 and outer side L3 of its corresponding blade 301 and is located outside the space defined by the inner side L4 and outer side L3 of its corresponding blade 301.

[0054] As an optional implementation of the above embodiment, the distance between the first endpoint P1 and the axis O of the top cover 100 is a first distance; the distance between the second endpoint P2 and the axis O of the top cover 100 is a second distance; wherein, the first distances between two circumferentially adjacent movable guide vanes 300 are different and / or the second distances between two circumferentially adjacent movable guide vanes 300 are different. For example, the first distance between the first movable guide vane 310 is different from the first distance between the second movable guide vane 320, and the second distance between the first movable guide vane 310 is different from the second distance between the second movable guide vane 320; the first distance between the first movable guide vane 310 is different from the first distance between the second movable guide vane 320, and the second distance between the first movable guide vane 310 is the same as the second distance between the second movable guide vane 320; the first distance between the first movable guide vane 310 is the same as the first distance between the second movable guide vane 320, and the second distance between the first movable guide vane 310 is different from the second distance between the second movable guide vane 320. In this embodiment, the radial distances between the end points of the two groups of movable guide vanes 300 are set to be different, so that the water flow changes non-uniformly, thereby achieving the purpose of increasing the hump margin and improving the "S" characteristic.

[0055] As an alternative to the aforementioned embodiment, this application also proposes a pump-turbine system including a water diversion mechanism. This water diversion mechanism utilizes some or all of the technical solutions of the aforementioned embodiment, thereby possessing the technical advantages of the aforementioned embodiment. A pump-turbine system incorporating the water diversion mechanism proposed in this embodiment exhibits increased hump margin, improved S characteristics, and enhanced unit operational stability.

[0056] The above is a detailed introduction to a water guide mechanism and a water pump turbine provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A water guide mechanism, characterized in that: include: Top cover and bottom ring; a plurality of movable guide vanes, the plurality of movable guide vanes being disposed between the top cover and the bottom ring, being rotatably connected to the top cover and the bottom ring, and being spaced apart along the circumference of the top cover and the bottom ring; the movable guide vanes being capable of synchronously opening and closing about a rotation axis; The movable guide vane includes a blade and a rotating shaft, the blade is fixed on the rotating shaft, and the rotating shaft is rotatably connected to the top cover and the bottom ring; The blade has a high-pressure side and a low-pressure side that are arranged opposite to each other in the circumferential direction of the top cover and the bottom ring. The high-pressure side has a first end point of the movable guide vane, and a line connecting the first end point and the axis of the top cover and the bottom ring is a first connecting line. The first connecting line has a first normal line, and the high-pressure side has a second normal line passing through the first end point. The angle between the first normal line and the second normal line is the placement angle of the high-pressure side. The low-pressure side has a second end point of the movable guide vane; a line connecting the second end point and the axis of the top cover and the bottom ring is a second connecting line; the second connecting line has a third normal line, the low-pressure side has a fourth normal line passing through the second end point, and the angle between the third normal line and the fourth normal line is the low-pressure side placement angle; Among them, the guide vane profiles of two circumferentially adjacent movable guide vanes are different; when the two circumferentially adjacent movable guide vanes are opened, the high-pressure side placement angles of the two circumferentially adjacent movable guide vanes are different and / or the low-pressure side placement angles of the two circumferentially adjacent movable guide vanes are different.

2. The water guide mechanism according to claim 1, wherein: The plurality of movable guide vanes include a plurality of first movable guide vanes and a plurality of second movable guide vanes; the first movable guide vanes and the second movable guide vanes have different guide vane profiles; One second movable guide vane is provided between two circumferentially adjacent first movable guide vanes; The first movable guide vane has a first high-pressure side placement angle and a first low-pressure side placement angle, and the second movable guide vane has a second high-pressure side placement angle and a second low-pressure side placement angle; When the circumferentially adjacent first and second movable guide vanes are in an open state, the first high-pressure side placement angle is different from the second high-pressure side placement angle and / or the first low-pressure side placement angle is different from the second low-pressure side placement angle.

3. The water guide mechanism according to claim 2, wherein: When the circumferentially adjacent first and second movable guide vanes are in an open state, the first high-pressure side placement angle is different from the second high-pressure side placement angle, and the first low-pressure side placement angle is the same as the second low-pressure side placement angle.

4. The water guide mechanism according to claim 2, wherein: When the circumferentially adjacent first and second movable guide vanes are in an open state, the first high-pressure side placement angle is the same as the second high-pressure side placement angle, and the first low-pressure side placement angle is different from the second low-pressure side placement angle.

5. The water guide mechanism according to claim 2, wherein: When the circumferentially adjacent first and second movable guide vanes are in an open state, the first high-pressure side placement angle is different from the second high-pressure side placement angle, and the first low-pressure side placement angle is different from the second low-pressure side placement angle.

6. The water guide mechanism according to claim 1, wherein: The blade further comprises an inner side edge and an outer side edge connecting the high-pressure side edge and the low-pressure side edge; the inner side edge has a first profile line, and the outer side edge has a second profile line; Wherein, the first profile lines and / or the second profile lines of two circumferentially adjacent movable guide vanes are different.

7. The water guide mechanism according to claim 6, wherein: In a projection plane perpendicular to the axial direction of the top cover, a rotation shaft of one of two circumferentially adjacent movable guide vanes is located between the inner and outer edges of its corresponding blade, and a portion of the circumference of the other rotation shaft protrudes beyond the inner and outer edges of its corresponding blade.

8. The water guide mechanism according to claim 1, wherein: The distance between the first end point and the axis of the top cover and the bottom ring is a first distance; the distance between the second end point and the axis of the top cover and the bottom ring is a second distance; The first distances between two circumferentially adjacent movable guide vanes are different and / or the second distances between two circumferentially adjacent movable guide vanes are different.

9. A water pump turbine, characterized in that: The water guide mechanism comprises the water guide mechanism according to any one of claims 1 to 8.

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