Axial-flow movable propeller turbine

Abstract

The utility model discloses an axial flow Kaplan turbine which comprises a runner hub, a plurality of rotating shafts, a plurality of blades, a first driving mechanism and a second driving mechanism, each rotating shaft is arranged around the runner hub, each rotating shaft is of a telescopic structure, and one end of each rotating shaft is rotationally connected with the runner hub; each blade is arranged on the side of the runner hub in the circumferential direction and fixedly connected with one end of the corresponding rotating shaft. The first driving mechanism is connected with the rotating shafts and used for driving the rotating shafts to rotate synchronously so as to adjust the inclination angles of the blades. The water turbine has the advantages that the second driving mechanism can drive the rotating shafts to extend synchronously, so that the distance between each blade and the runner hub is increased, the horizontal distance between each blade and water flow is reduced, when the water flow is small, most of the water flow can fall on the blades, and the power generation efficiency of the water turbine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbines, in particular to an axial flow Kaplan turbine. Background Art

[0002] The blade angle of the runner of an axial flow Kaplan turbine can be adjusted to adapt to the changes in water head and flow rate to maintain a high power generation efficiency. The water flow of an axial flow turbine enters the runner blades axially and also exits the runner blades axially. Although the existing axial flow Kaplan turbine (such as an axial flow Kaplan turbine disclosed in the application number 201310447134.3) can adjust the angle of the runner blades to make the runner blades adapt to the changes in water head and flow rate, thereby ensuring that the water turbine maintains a high power generation efficiency, the distance between the runner blades and the runner body cannot be adjusted. When the water flow is small, the horizontal distance between the water flow flowing out of the spiral case and the runner body is far, and only a small amount of water flow falls on the runner blades, and the power generation efficiency of the water turbine is still low. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above technical deficiencies and propose an axial flow Kaplan turbine to solve the technical problem that the distance between the runner blades of the water turbine and the runner body in the prior art cannot be adjusted. When the water flow is small, the horizontal distance between the water flow flowing out of the spiral case and the runner body is far, and only a small amount of water flow falls on the runner blades, making it difficult to ensure the power generation efficiency of the water turbine.

[0004] To achieve the above technical purpose, the technical solution of the utility model provides an axial flow Kaplan turbine, including:

[0005] A runner body;

[0006] A plurality of rotating shafts, all arranged around the runner body, the rotating shafts are telescopic structures, and one end of each rotating shaft is rotatably connected to the runner body;

[0007] A plurality of blades, all arranged circumferentially on the side of the runner body and respectively fixedly connected to one end of the corresponding rotating shaft;

[0008] A first driving mechanism, connected to each of the rotating shafts, for driving each of the rotating shafts to rotate synchronously to adjust the inclination angle of each of the blades;

[0009] A second driving mechanism, connected to each of the rotating shafts, for driving each of the rotating shafts to expand and contract synchronously to adjust the distance between each of the blades and the runner body.

[0010] Furthermore, the runner body includes a housing and a mounting roller. The housing has a sealed cavity. The mounting roller is disposed in the cavity along the length direction of the cavity. Both ends of the mounting roller are fixedly connected to the housing. One end of the rotating shaft is rotatably connected to the mounting roller.

[0011] Furthermore, the rotating shaft includes a fixed shaft, a first sleeve, and a first piston. Each of the fixed shafts is disposed in the cavity and is arranged circumferentially on the side of the mounting roller. The fixed shaft is disposed radially with respect to the mounting roller. One end of the fixed shaft close to the mounting roller is rotatably connected to the mounting roller. The first sleeve slidably penetrates through the housing. Each of the blades is fixedly connected to the outer end of the corresponding first sleeve. The first piston is slidably disposed in the first sleeve and can move along the length direction of the first sleeve. The first piston is fixedly connected to the end of the fixed shaft away from the mounting roller.

[0012] Furthermore, the rotating shaft further includes at least two guide rails. Each of the guide rails is fixedly disposed in the first sleeve at intervals along the length direction of the first sleeve. At least two sliding grooves are formed in the first piston, and the first piston is slidably clamped to the corresponding guide rail through each of the sliding grooves.

[0013] Furthermore, the rotating shaft further includes a second sleeve, a second piston, and a moving shaft. The second sleeve is disposed radially with respect to the fixed shaft and tangentially with respect to the mounting roller. One end of the second sleeve is fixedly connected to the fixed shaft. The second piston is slidably disposed in the second sleeve. One end of the moving shaft is fixedly connected to the second piston.

[0014] Furthermore, the first driving mechanism is disposed in the cavity and is located on one side of each of the fixed shafts. It includes a moving ring, a plurality of connecting rods, and at least one telescopic driving member. The moving ring is slidably sleeved on the mounting roller. One end of each of the connecting rods is fixedly connected to the moving ring. The other end of each of the connecting rods is respectively ball-joint connected to the other end of the corresponding moving shaft. Each of the telescopic driving members is fixedly connected to the housing. The output end of each of the telescopic driving members is fixedly connected to the moving ring, and is used to drive the moving ring to move axially along the mounting roller, so that the moving ring approaches or moves away from each of the fixed shafts.

[0015] Furthermore, the second driving mechanism is disposed within the cavity and on the other side of each of the fixed shafts. The second driving mechanism includes a rotating ring, a plurality of sliding shafts, a toothed ring, a gear, and a rotating driving member. The rotating ring is rotatably sleeved on the mounting roller, and a plurality of arc-shaped grooves are circumferentially formed on the rotating ring. Each of the arc-shaped grooves has a radial structure. One end of each of the sliding shafts is slidably disposed within a corresponding one of the arc-shaped grooves, and the other end of each of the sliding shafts is fixedly connected to a corresponding first sleeve. The toothed ring is rotatably sleeved on the mounting roller and is fixedly connected to the rotating ring. The gear meshes with the toothed ring, and the rotating driving member is fixedly connected to the housing. The output end of the rotating driving member is coaxially fixedly connected to the gear for driving the gear to rotate.

[0016] Furthermore, each of the sliding shafts is disposed on one side of the rotating ring and between the rotating ring and the first sleeve, and the toothed ring is disposed on the other side of the rotating ring.

[0017] Furthermore, the second driving mechanism further includes two limiting rings, which are respectively disposed on one side of the rotating ring and the other side of the toothed ring and are fixedly sleeved on the mounting roller.

[0018] Furthermore, the second driving mechanism further includes a plurality of limiting members, which correspond to the sliding shafts one by one. Each limiting member includes two limiting caps, which are respectively disposed on both sides of the rotating ring and are fixedly sleeved on the sliding shaft.

[0019] Compared with the prior art, the beneficial effects of the present utility model include: during use, according to the changes in water head and flow rate, by controlling the first driving mechanism, the first driving mechanism can drive each rotating shaft to rotate synchronously and drive each blade to rotate synchronously, so as to adjust the inclination angle of each blade and make the blade in the optimal inclination angle. When the water flow rate is small, the horizontal distance between the water flow flowing out of the volute and the runner body is relatively far. By controlling the second driving mechanism, the second driving mechanism can drive each rotating shaft to extend synchronously, so as to increase the distance between each blade and the runner body, and further reduce the horizontal distance between each blade and the water flow. When the water flow rate is small, most of the water flow can also fall on the blades, improving the power generation efficiency of the water turbine. Description of the Drawings

[0020] Figure 1 is a three-dimensional structural schematic diagram of an axial flow Kaplan turbine provided by the present utility model;

[0021] Figure 2 is Figure 1 a sectional view of an axial flow Kaplan turbine in

[0022] Figure 3 is Figure 2 a schematic three-dimensional structure view of a Kaplan turbine from another perspective in

[0023] Figure 4 is Figure 2 a sectional view of the rotating shaft and connecting rod of a Kaplan turbine from another perspective in

[0024] In the figure: 100 - runner body, 110 - housing, 111 - cavity, 120 - mounting roller, 200 - rotating shaft, 210 - fixed shaft, 220 - first sleeve, 230 - first piston, 231 - chute, 240 - guide rail, 250 - second sleeve, 260 - second piston, 270 - moving shaft, 300 - blade, 400 - first driving mechanism, 410 - moving ring, 420 - connecting rod, 430 - telescopic driving member, 500 - second driving mechanism, 510 - rotating ring, 511 - arc-shaped groove, 520 - sliding shaft, 530 - toothed ring, 540 - gear, 550 - rotating driving member, 560 - limiting ring, 570 - limiting member, 571 - limiting cap. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] The present utility model provides a Kaplan turbine, and its structure is as shown in Figure 1 - Figure 3 and includes a runner body 100, a plurality of rotating shafts 200, a plurality of blades 300, a first driving mechanism 400 and a second driving mechanism 500. Each of the rotating shafts 200 is arranged around the runner body 100, and the rotating shaft 200 is a telescopic structure, and one end thereof is rotatably connected to the runner body 100; each of the blades 300 is arranged circumferentially on the side of the runner body 100 and is fixedly connected to one end of the corresponding rotating shaft 200; the first driving mechanism 400 is connected to each of the rotating shafts 200 and is used to drive each of the rotating shafts 200 to rotate synchronously to adjust the inclination angles of the blades 300; the second driving mechanism 500 is connected to each of the rotating shafts 200 and is used to drive each of the rotating shafts 200 to extend and retract synchronously to adjust the distance between each of the blades 300 and the runner body 100.

[0027] During use, according to the changes in water head and flow rate, by controlling the first driving mechanism 400, the first driving mechanism 400 can drive each of the rotating shafts 200 to rotate synchronously and drive each of the blades 300 to rotate synchronously, so as to adjust the inclination angles of each of the blades 300 and make the blades 300 in the optimal inclination angles. When the water flow rate is small, the horizontal distance between the water flow flowing out of the volute and the runner body 100 is relatively far. By controlling the second driving mechanism 500, the second driving mechanism 500 can drive each of the rotating shafts 200 to extend synchronously, so that the distance between each of the blades 300 and the runner body 100 can be increased, and further the horizontal distance between each of the blades 300 and the water flow can be reduced. When the water flow rate is small, most of the water flow can also fall on the blades 300, improving the power generation efficiency of the water turbine.

[0028] As a preferred embodiment, please refer to Figure 2 , the runner body 100 includes a housing 110 and a mounting roller 120. The housing 110 has a sealed cavity 111. The mounting roller 120 is disposed in the cavity 111 along the length direction of the cavity 111. Both ends of the mounting roller 120 are fixedly connected to the housing 110. One end of the rotating shaft 200 is rotatably connected to the mounting roller 120. The cavity 111 can accommodate the first driving mechanism 400 and the second driving mechanism 500, so that the first driving mechanism 400 and the second driving mechanism 500 are in a sealed environment, avoiding the first driving mechanism 400 and the second driving mechanism 500 from being eroded by water.

[0029] As a preferred embodiment, please refer to Figure 2 and Figure 4, the rotating shaft 200 includes a fixed shaft 210, a first sleeve 220 and a first piston 230. Each of the fixed shafts 210 is disposed within the cavity 111 and is circumferentially arranged on the side of the mounting roller 120. The fixed shaft 210 is disposed radially with respect to the mounting roller 120. One end of the fixed shaft 210 close to the mounting roller 120 is rotatably connected to the mounting roller 120. The first sleeve 220 slidably penetrates the housing 110. Each of the blades 300 is fixedly connected to the outer end of the corresponding first sleeve 220. The first piston 230 is slidably disposed within the first sleeve 220 and can move along the length direction of the first sleeve 220. The first piston 230 is fixedly connected to one end of the fixed shaft 210 away from the mounting roller 120. The fixed shaft 210 and the first sleeve 220 are telescoped by the movement of the first piston 230 along the length direction of the first sleeve 220, and there is no relative rotation between the fixed shaft 210 and the first sleeve 220, so that the first driving mechanism 400 drives each of the blades 300 to rotate, realizing synchronous adjustment of the inclination angles of each of the blades 300 without interference.

[0030] As a preferred embodiment, please refer to Figure 4 , the rotating shaft 200 further includes at least two guide rails 240. Each of the guide rails 240 is fixedly disposed within the first sleeve 220 at intervals along the length direction of the first sleeve 220. At least two sliding grooves 231 are formed on the first piston 230, and each of the sliding grooves 231 is slidably clamped on the corresponding guide rail 240 respectively. Through the sliding connection of each of the sliding grooves 231 and the corresponding first guide rail 240, the movement of the first piston 230 can be guided, so that the first piston 230 can only move along the length direction of the first sleeve 220, but cannot rotate relative to the first sleeve 220.

[0031] As a preferred embodiment, please refer to Figure 4 , the rotating shaft 200 further includes a second sleeve 250, a second piston 260 and a moving shaft 270. The second sleeve 250 is disposed radially with respect to the fixed shaft 210 and tangentially with respect to the mounting roller 120. One end of the second sleeve 250 is fixedly connected to the fixed shaft 210. The second piston 260 is slidably disposed within the second sleeve 250. One end of the moving shaft 270 is fixedly connected to the second piston 260. The moving shaft 270 and the second sleeve 250 are telescoped by the movement of the second piston 260 along the length direction of the second sleeve 250.

[0032] As a preferred embodiment, please refer to Figure 2 and Figure 3, the first driving mechanism 400 is disposed in the cavity 111 and located on one side of each of the fixed shafts 210. It includes a moving ring 410, a plurality of connecting rods 420, and at least one telescopic driving member 430. The moving ring 410 is slidably sleeved on the mounting roller 120. One end of each of the connecting rods 420 is fixedly connected to the moving ring 410, and the other end of each of the connecting rods 420 is respectively ball-joint connected to the other end of the corresponding moving shaft 270. Each of the telescopic driving members 430 is fixedly connected to the housing 110, and the output end of each of the telescopic driving members 430 is fixedly connected to the moving ring 410, and is used to drive the moving ring 410 to move along the axial direction of the mounting roller 120, so that the moving ring 410 approaches or moves away from each of the fixed shafts 210. When it is necessary to adjust the inclination angles of the blades 300, each of the telescopic driving members 430 is synchronously controlled, so that each of the telescopic driving members 430 can drive the moving ring 410 to move along the axial direction of the mounting roller 120, so that the moving ring 410 approaches or moves away from each of the fixed shafts 210. During the process that the moving ring 410 approaches each of the fixed shafts 210, through the transmission of each of the connecting rods 420, each of the moving shafts 270 and each of the second sleeves 250 are pushed to rotate forward around the fixed shaft 210, thereby driving each of the blades 300 to rotate forward to achieve forward flipping. During the process that the moving ring 410 moves away from each of the fixed shafts 210, through the transmission of each of the connecting rods 420, each of the moving shafts 270 and each of the second sleeves 250 are pushed to rotate reversely around the fixed shaft 210, thereby driving each of the blades 300 to rotate reversely to achieve reverse flipping. During the process that the moving shaft 270 and the second sleeve 250 rotate forward or reversely around the fixed shaft 210, the moving shaft 270 slides relative to the second sleeve 250. The first driving mechanism 400 occupies a relatively small space, and can reduce the volume of the Kaplan turbine.

[0033] As a preferred embodiment, please refer to Figure 2 and Figure 3, the second driving mechanism 500 is disposed in the cavity 111 and on the other side of each of the fixed shafts 210. The second driving mechanism 500 includes a rotating ring 510, a plurality of sliding shafts 520, a toothed ring 530, a gear 540, and a rotating driving member 550. The rotating ring 510 is rotatably sleeved on the mounting roller 120. A plurality of arc-shaped grooves 511 are circumferentially formed on the rotating ring 510. Each of the arc-shaped grooves 511 has a radial structure. One end of each of the sliding shafts 520 is slidably disposed in the corresponding arc-shaped groove 511, and the other end of each of the sliding shafts 520 is fixedly connected to the corresponding first sleeve 220. The toothed ring 530 is rotatably sleeved on the mounting roller 120 and is fixedly connected to the rotating ring 510. The gear 540 meshes with the toothed ring 530. The rotating driving member 550 is fixedly connected to the housing 110, and the output end of the rotating driving member 550 is coaxially fixedly connected to the gear 540 for driving the gear 540 to rotate. When it is necessary to increase the distance between each of the blades 300 and the runner body 100, the rotating driving member 550 is controlled so that the rotating driving member 550 can drive the gear 540 to rotate forward and drive the toothed ring 530 to rotate reversely. During the reverse rotation of the toothed ring 530, the rotating ring 510 will be driven to rotate reversely. Since each of the arc-shaped grooves 511 has a radial structure, the sliding shaft 520 is restricted by the corresponding arc-shaped groove 511 and the corresponding first sleeve 220, so that the sliding shaft 520 can drive the first sleeve 220 to move radially outward along the mounting roller 120, thereby increasing the distance between the blade 300 and the housing 110.

[0034] As a preferred embodiment, please refer to Figure 2 and Figure 3 , each of the sliding shafts 520 is disposed on one side of the rotating ring 510 and between the rotating ring 510 and the first sleeve 220. The toothed ring 530 is disposed on the other side of the rotating ring 510, so that the movement of each of the sliding shafts 520 and the rotation of the toothed ring 530 will not interfere with each other.

[0035] As a preferred embodiment, please refer to Figure 2 and Figure 3 , the second driving mechanism 500 further includes two limiting rings 560. The two limiting rings 560 are respectively disposed on one side of the rotating ring 510 and the other side of the toothed ring 530 and are both fixedly sleeved on the mounting roller 120. The rotating ring 510 and the toothed ring 530 can be limited by the two limiting rings 560, so that the rotating ring 510 and the toothed ring 530 will not move axially along the mounting roller 120.

[0036] As a preferred embodiment, please refer to Figure 2 and Figure 3 , the second driving mechanism 500 further includes a plurality of limiting members 570, each of the limiting members 570 corresponds to each of the sliding shafts 520 one by one, the limiting member 570 includes two limiting caps 571, the two limiting caps 571 are respectively disposed on both sides of the rotating ring 510, and are fixedly sleeved on the sliding shaft 520. The sliding shaft 520 can be limited by the two limiting caps 571 to prevent the sliding shaft 520 from disengaging from the arc-shaped groove 511.

[0037] To better understand the present invention, the working principle of the technical solution of the present invention will be described in detail below in conjunction with Figure 1 - Figure 4 :

[0038] During use, according to the changes in water head and flow rate, when it is necessary to adjust the inclination angles of the respective blades 300, the respective telescopic driving members 430 are synchronously controlled, so that the respective telescopic driving members 430 can drive the moving ring 410 to move along the axial direction of the mounting roller 120, so that the moving ring 410 approaches or moves away from the respective fixed shafts 210. During the process that the moving ring 410 approaches the respective fixed shafts 210, through the transmission action of the respective connecting rods 420, the respective moving shafts 270 and the respective second sleeves 250 are pushed to rotate positively around the fixed shafts 210, thereby driving the respective blades 300 to rotate positively and realizing positive flipping. During the process that the moving ring 410 moves away from the respective fixed shafts 210, through the transmission action of the respective connecting rods 420, the respective moving shafts 270 and the respective second sleeves 250 are pushed to rotate reversely around the fixed shafts 210, thereby driving the respective blades 300 to rotate reversely and realizing reverse flipping, so that the blades 300 are in the optimal inclination angle. When the water flow rate is small, the horizontal distance between the water flow flowing out of the volute and the runner body 100 is relatively far. It is necessary to increase the distance between the respective blades 300 and the runner body 100. The rotation driving member 550 is controlled so that the rotation driving member 550 can drive the gear 540 to rotate positively and drive the toothed ring 530 to rotate reversely. During the reverse rotation of the toothed ring 530, the rotating ring 510 is driven to rotate reversely. Since the respective arc-shaped grooves 511 are all in a radial structure, the sliding shaft 520 is restricted by the corresponding arc-shaped groove 511 and the corresponding first sleeve 220, so that the sliding shaft 520 can drive the first sleeve 220 to move radially outward along the mounting roller 120, and the respective rotating shafts 200 extend synchronously, so that the distance between the respective blades 300 and the runner body 100 can be increased, and further the horizontal distance between the respective blades 300 and the water flow can be reduced. When the water flow rate is small, most of the water flow can also fall on the blades 300, improving the power generation efficiency of the water turbine.

[0039] An axial flow Kaplan turbine provided by the present utility model has the following beneficial effects:

[0040] (1) The first driving mechanism 400 occupies a relatively small space, and the volume of the axial flow Kaplan turbine can be reduced;

[0041] (2) The inclination angles of the respective blades 300 can be adjusted through the first driving mechanism 400, so that the blades 300 are in the optimal inclination angle. The distance between the respective blades 300 and the runner body 100 can be adjusted through the second driving mechanism 500, so that the respective blades 300 are in the optimal position, thereby ensuring that the water turbine maintains a high power generation efficiency;

[0042] (3) The second driving mechanism 500 can drive each of the rotating shafts 200 to synchronously extend, so that the distance between each of the blades 300 and the runner body 100 can be increased, and further the horizontal distance between each of the blades 300 and the water flow can be reduced. When the water flow rate is small, most of the water flow can also fall on the blades 300, improving the power generation efficiency of the water turbine.

[0043] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An axial-flow Kaplan turbine, characterized in that, Comprising: Runner body; A plurality of rotating shafts, all arranged around the runner body, the rotating shafts being of a telescopic structure, one end of which is rotatably connected to the runner body; A plurality of blades, all arranged circumferentially on the side of the runner body and respectively fixedly connected to one end of the corresponding rotating shaft; A first driving mechanism, connected to each of the rotating shafts, for driving each of the rotating shafts to rotate synchronously to adjust the inclination angles of the respective blades; A second driving mechanism, connected to each of the rotating shafts, for driving each of the rotating shafts to expand and contract synchronously to adjust the distance between each of the blades and the runner body.

2. The Kaplan turbine according to claim 1, wherein The runner body includes a housing and a mounting roller. The housing has a sealed cavity. The mounting roller is arranged in the cavity along the length direction of the cavity. Both ends of the mounting roller are fixedly connected to the housing. One end of the rotating shaft is rotatably connected to the mounting roller.

3. The Kaplan turbine according to claim 2, characterized in that, The rotating shaft includes a fixed shaft, a first sleeve and a first piston. Each of the fixed shafts is arranged in the cavity and is arranged circumferentially on the side of the mounting roller. The fixed shaft is arranged radially with respect to the mounting roller. One end of the fixed shaft close to the mounting roller is rotatably connected to the mounting roller. The first sleeve slidably penetrates through the housing. Each of the blades is fixedly connected to the outer end of the corresponding first sleeve. The first piston is slidably arranged in the first sleeve and can move along the length direction of the first sleeve. The first piston is fixedly connected to the end of the fixed shaft away from the mounting roller.

4. The Kaplan turbine according to claim 3, characterized in that, The rotating shaft further includes at least two guide rails. Each of the guide rails is fixedly arranged in the first sleeve at intervals along the length direction of the first sleeve. At least two sliding grooves are formed in the first piston, and the first piston is respectively slidably clamped on the corresponding guide rails through the sliding grooves.

5. The Kaplan turbine according to claim 3, characterized in that, The rotating shaft further includes a second sleeve, a second piston and a moving shaft. The second sleeve is arranged radially with respect to the fixed shaft and tangentially with respect to the mounting roller. One end of the second sleeve is fixedly connected to the fixed shaft. The second piston is slidably arranged in the second sleeve. One end of the moving shaft is fixedly connected to the second piston.

6. The Kaplan turbine according to claim 5, characterized in that, The first driving mechanism is arranged in the cavity and is located on one side of each of the fixed shafts. It includes a moving ring, a plurality of connecting rods and at least one telescopic driving member. The moving ring is slidably sleeved on the mounting roller. One end of each of the connecting rods is fixedly connected to the moving ring. The other end of each of the connecting rods is respectively ball-joint connected to the other end of the corresponding moving shaft. Each of the telescopic driving members is fixedly connected to the housing. The output end of each of the telescopic driving members is fixedly connected to the moving ring, for driving the moving ring to move axially along the mounting roller so that the moving ring approaches or moves away from each of the fixed shafts.

7. The Kaplan turbine according to claim 3, wherein The second driving mechanism is arranged in the cavity and on the other side of each of the fixed shafts. The second driving mechanism includes a rotating ring, a plurality of sliding shafts, a toothed ring, a gear, and a rotating driving member. The rotating ring is rotatably sleeved on the mounting roller. A plurality of arc-shaped grooves are circumferentially formed in the rotating ring, and each of the arc-shaped grooves has a radial structure. One end of each of the sliding shafts is slidably arranged in a corresponding arc-shaped groove, and the other end of each of the sliding shafts is fixedly connected to a corresponding first sleeve. The toothed ring is rotatably sleeved on the mounting roller and is fixedly connected to the rotating ring. The gear meshes with the toothed ring. The rotating driving member is fixedly connected to the housing, and the output end of the rotating driving member is coaxially fixedly connected to the gear for driving the gear to rotate.

8. The Kaplan turbine according to claim 7, characterized in that, Each of the sliding shafts is arranged on one side of the rotating ring and is located between the rotating ring and the first sleeve. The toothed ring is arranged on the other side of the rotating ring.

9. The Kaplan turbine according to claim 7, characterized in that, The second driving mechanism further includes two limiting rings, and the two limiting rings are respectively arranged on one side of the rotating ring and the other side of the toothed ring and are both fixedly sleeved on the mounting roller.

10. The Kaplan turbine according to claim 7, characterized in that, The second driving mechanism further includes a plurality of limiting members, and each of the limiting members corresponds to one of the sliding shafts. The limiting member includes two limiting caps, and the two limiting caps are respectively arranged on both sides of the rotating ring and are both fixedly sleeved on the sliding shaft.

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