Water turbine model runner

Abstract

The invention discloses a water turbine model runner, which belongs to the technical field of water turbines, and comprises an upper crown, a blade and a lower ring, the upper crown, the blade and the lower ring are sequentially assembled and connected, the blade comprises a fixed part and a detachable part, the upper crown is provided with a first blade root groove and a second blade root groove, the first blade root groove is provided with a fixed blade root, and the second blade root groove is provided with a detachable blade root. The second blade root groove is provided with a detachable blade root, the detachable blade root is connected with a detachable part of the blade, the fixed blade root is connected with a fixed part of the blade, the fixed part is in contact with the detachable part, and the fixed blade root is in contact with the detachable blade root. Local blades and blade roots can be quickly replaced, the whole blades do not need to be replaced, and the model runner can be quickly optimized to improve the performance of the model runner.

Description

Technical Field

[0001] The invention relates to the technical field of water turbines, and in particular to a water turbine model runner. Background Art

[0002] At present, the turbine model runner is usually assembled by combining the upper crown, lower ring and blades, and the three are tightly assembled into a whole through positioning pins and screws. There are also ways to assemble the three into one by welding, but they are all split structures rather than integral runners. After the model runner has obtained its performance through testing, it is usually necessary to conduct multiple rounds of optimization to improve the performance parameters. This type of optimization only requires changes to some areas of the blades to obtain highly targeted improvements.

[0003] However, the existing technical solutions have the following defects: when it is necessary to modify a part of the blade, such as the head area, the entire blade needs to be reprocessed instead of the part, which not only takes a long time, but also causes higher costs due to the use of a whole blade blank for processing. At the same time, in the assembled runner, the processing area is limited, and the lower ring or even the upper crown of the runner has to be removed to expose the blade for further processing.

[0004] A Chinese patent document with publication number CN 103979138B and publication date May 4, 2016 discloses a flexible blade with variable curvature and a tidal energy turbine, wherein the flexible blade comprises a fixed beam and a flexible blade body fixed on the fixed beam, wherein at least one deformation control line is arranged in the flexible blade body, wherein the deformation control line comprises a sleeve and a pull line, wherein the sleeve is embedded in the fixed beam, wherein the pull line is passed through the sleeve and one end of the pull line is fixed on the flexible blade body; the tidal energy turbine comprises a runner body and a flexible blade with variable curvature arranged on the runner body, wherein a pull line traction assembly is arranged in the runner body, and the pull line traction assembly is connected to the pull line of the deformation control line.

[0005] The patent document discloses a flexible blade with variable curvature and a tidal energy turbine. By changing the tension of the deformation control line, the curvature of the root and tip of the flexible blade can be changed, thereby changing the fluid dynamic characteristics of the blade, thereby improving the starting performance of the turbine during the startup phase, maintaining a high energy conversion efficiency of the turbine after the turbine starts and reaches the rated speed; at the same time, when the water flow speed changes, it can ensure that the turbine works in the optimal working condition. However, when the blade needs to be partially modified, the entire blade still needs to be reprocessed, which has a long preparation cycle and is not conducive to rapid optimization of the turbine. Summary of the invention

[0006] In order to overcome the defects of the above-mentioned prior art, the present invention provides a turbine model runner, which can quickly replace partial blades and blade roots without replacing the entire blade, thereby facilitating rapid optimization of the model runner to improve the performance of the model runner.

[0007] The present invention is achieved through the following technical solutions: A turbine model runner comprises an upper crown, blades and a lower ring, which are assembled and connected in sequence, the blades comprising a fixed portion and a detachable portion, the upper crown is provided with a first blade root groove and a second blade root groove, the first blade root groove is provided with a fixed blade root, the second blade root groove is provided with a detachable blade root, the detachable portion of the blade is connected to the detachable blade root, the fixed blade root is connected to the fixed portion of the blade, the fixed portion is in contact with the detachable portion, and the fixed blade root is in contact with the detachable blade root.

[0008] The width of the detachable blade root is 8-10 mm wider than that of the fixed blade root.

[0009] The side wall of the detachable blade root is straight and open outwards.

[0010] The detachable blade root is provided with a first fillet and a second fillet, and the first fillet and the second fillet are close to one side of the fixed blade root.

[0011] The first rounded corner and the second rounded corner are arranged correspondingly, and the rounded corner radii of the first rounded corner and the second rounded corner are both 7-10 mm.

[0012] The detachable blade root is provided with a first pin hole and a first screw hole.

[0013] The fixed blade root is provided with a second pin hole and a second screw hole.

[0014] There are two first pin holes and two first screw holes.

[0015] The number of the second pin holes is two, and the number of the second screw holes is three.

[0016] The thickness of the outermost circle of the detachable blade root is 1 / 3 of the thickness of the outermost circle of the upper crown.

[0017] The beneficial effects of the present invention are mainly manifested in the following aspects: 1. In the present invention, the blade includes a fixed part and a detachable part, a first blade root groove and a second blade root groove are opened on the upper crown, a fixed blade root is arranged on the first blade root groove, a detachable blade root is arranged on the second blade root groove, the detachable part of the blade is connected to the detachable blade root, the fixed part of the blade is connected to the fixed blade root, the fixed part is in contact with the detachable part, and the fixed blade root is in contact with the detachable blade root. Compared with the prior art, partial blades and blade roots can be quickly replaced without replacing the entire blade, which is convenient for quickly optimizing the model wheel to improve the performance of the model wheel.

[0018] 2. In the present invention, the width of the detachable blade root is 8-10 mm wider than that of the fixed blade root, which can ensure that the contact surface after assembly with the slotted upper crown is larger and more firm, and can still remain stable after multiple disassembly and assembly.

[0019] Third, in the present invention, the side wall of the detachable blade root is straight and open outward, so that the detachable blade root can be directly taken out from the radial direction without removing the ring after assembly, and the detachable blade root can be disassembled and assembled conveniently and quickly.

[0020] Fourth, in the present invention, the detachable blade root is provided with a first fillet and a second fillet, and the first fillet and the second fillet are close to one side of the fixed blade root, so that it is convenient to use a tool for milling during subsequent crown grooving, thereby improving processing efficiency.

[0021] 5. In the present invention, a first pin hole and a first screw hole are formed on the detachable blade root, so as to facilitate the subsequent assembly of the detachable blade root and ensure the connection stability of the detachable blade root.

[0022] 6. In the present invention, a second pin hole and a second screw hole are provided on the fixed blade root, so as to facilitate the subsequent connection of the fixed blade root and ensure the reliability of the connection of the fixed blade root.

[0023] 7. In the present invention, there are two first pin holes and two first screw holes, which facilitates rapid determination of the position of the detachable blade root and improves positioning efficiency.

[0024] 8. In the present invention, the thickness of the outermost circumference of the detachable blade root is 1 / 3 of the thickness of the outermost circumference of the upper crown, which can ensure the structural strength of the entire upper crown after grooving. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementations, wherein: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the blade of the present invention; Figure 3 It is a structural schematic diagram of the crown of the present invention; Figure 4 It is a schematic diagram of the structure of the blade root of the present invention; Markings in the figure: 1. upper crown, 2. blade, 3. lower ring, 4. fixed part, 5. detachable part, 6. first blade root groove, 7. second blade root groove, 8. fixed blade root, 9. detachable blade root, 10. first fillet, 11. second fillet, 12. first pin hole, 13. first screw hole, 14. second pin hole, 15. second screw hole. DETAILED DESCRIPTION

[0026] Example 1 See also Figure 1-Figure 3A turbine model runner comprises an upper crown 1, blades 2 and a lower ring 3, which are assembled and connected in sequence. The blade 2 comprises a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9.

[0027] This embodiment is the most basic implementation method. The blade 2 includes a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9. Compared with the prior art, the partial blade 2 and the blade root can be quickly replaced without replacing the entire blade 2, so as to facilitate the rapid optimization of the model wheel to improve the performance of the model wheel.

[0028] Example 2 See also Figure 1-Figure 3 A turbine model runner comprises an upper crown 1, blades 2 and a lower ring 3, which are assembled and connected in sequence. The blade 2 comprises a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9.

[0029] The width of the detachable blade root 9 is 8 mm wider than the width of the fixed blade root 8 .

[0030] This embodiment is a preferred implementation mode. The width of the detachable blade root 9 is wider than that of the fixed blade root 8, which can ensure that the contact surface after assembly with the slotted upper crown 1 is larger and more secure, and can still remain stable after multiple disassembly and assembly.

[0031] Example 3 See also Figure 1-Figure 3A turbine model runner comprises an upper crown 1, blades 2 and a lower ring 3, which are assembled and connected in sequence. The blade 2 comprises a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9.

[0032] Preferably, the width of the detachable blade root 9 is 9 mm wider than the width of the fixed blade root 8 .

[0033] The side wall of the detachable blade root 9 is straight and open outward.

[0034] This embodiment is another preferred implementation manner. The side wall of the detachable blade root 9 is linear and open outward, so that the detachable blade root 9 can be directly taken out radially without removing the ring 3 after assembly, and can be disassembled and assembled conveniently and quickly.

[0035] Example 4 See also Figure 1-Figure 3 A turbine model runner comprises an upper crown 1, blades 2 and a lower ring 3, which are assembled and connected in sequence. The blade 2 comprises a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9.

[0036] The width of the detachable blade root 9 is 10 mm wider than the width of the fixed blade root 8 .

[0037] The side wall of the detachable blade root 9 is straight and open outward.

[0038] The detachable blade root 9 is provided with a first fillet 10 and a second fillet 11 , and the first fillet 10 and the second fillet 11 are close to one side of the fixed blade root 8 .

[0039] The first rounded corner 10 and the second rounded corner 11 are arranged correspondingly, and the rounded corner radii of the first rounded corner 10 and the second rounded corner 11 are both 7 mm.

[0040] The present embodiment is another preferred implementation manner. The detachable blade root 9 is provided with a first fillet 10 and a second fillet 11. The first fillet 10 and the second fillet 11 are close to one side of the fixed blade root 8, so that when the crown 1 is subsequently grooved, milling can be smoothly performed using a tool, thereby improving processing efficiency.

[0041] Example 5 See also Figure 1-Figure 4 A turbine model runner comprises an upper crown 1, blades 2 and a lower ring 3, which are assembled and connected in sequence. The blade 2 comprises a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9.

[0042] The width of the detachable blade root 9 is 10 mm wider than the width of the fixed blade root 8 .

[0043] The side wall of the detachable blade root 9 is straight and open outward.

[0044] Further preferably, the detachable blade root 9 is provided with a first fillet 10 and a second fillet 11 , and the first fillet 10 and the second fillet 11 are close to one side of the fixed blade root 8 .

[0045] The first rounded corner 10 and the second rounded corner 11 are arranged correspondingly, and the rounded corner radii of the first rounded corner 10 and the second rounded corner 11 are both 9 mm.

[0046] The detachable blade root 9 is provided with a first pin hole 12 and a first screw hole 13 .

[0047] This embodiment is another preferred implementation manner. A first pin hole 12 and a first screw hole 13 are opened on the detachable blade root 9 to facilitate the subsequent assembly of the detachable blade root 9 and ensure the connection stability of the detachable blade root 9.

[0048] Example 6 See also Figure 1-Figure 4 A turbine model runner comprises an upper crown 1, blades 2 and a lower ring 3, which are assembled and connected in sequence. The blade 2 comprises a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9.

[0049] The width of the detachable blade root 9 is 10 mm wider than the width of the fixed blade root 8 .

[0050] The side wall of the detachable blade root 9 is straight and open outward.

[0051] The detachable blade root 9 is provided with a first fillet 10 and a second fillet 11 , and the first fillet 10 and the second fillet 11 are close to one side of the fixed blade root 8 .

[0052] The first rounded corner 10 and the second rounded corner 11 are arranged correspondingly, and the rounded corner radii of the first rounded corner 10 and the second rounded corner 11 are both 10 mm.

[0053] The detachable blade root 9 is provided with a first pin hole 12 and a first screw hole 13 .

[0054] The fixed blade root 8 is provided with a second pin hole 14 and a second screw hole 15 .

[0055] There are two first pin holes 12 and two first screw holes 13 .

[0056] The number of the second pin holes 14 is two, and the number of the second screw holes 15 is three.

[0057] This embodiment is another preferred implementation manner. A second pin hole 14 and a second screw hole 15 are opened on the fixed blade root 8 to facilitate the subsequent connection of the fixed blade root 8 and ensure the connection reliability of the fixed blade root 8.

[0058] Example 7 See also Figure 1-Figure 4 A turbine model runner comprises an upper crown 1, blades 2 and a lower ring 3, which are assembled and connected in sequence. The blade 2 comprises a fixed part 4 and a detachable part 5. A first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1. A fixed blade root 8 is arranged on the first blade root groove 6, and a detachable blade root 9 is arranged on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9.

[0059] The width of the detachable blade root 9 is 10 mm wider than the width of the fixed blade root 8 .

[0060] The side wall of the detachable blade root 9 is straight and open outward.

[0061] The detachable blade root 9 is provided with a first fillet 10 and a second fillet 11 , and the first fillet 10 and the second fillet 11 are close to one side of the fixed blade root 8 .

[0062] The first rounded corner 10 and the second rounded corner 11 are arranged correspondingly, and the rounded corner radii of the first rounded corner 10 and the second rounded corner 11 are both 10 mm.

[0063] The detachable blade root 9 is provided with a first pin hole 12 and a first screw hole 13 .

[0064] The fixed blade root 8 is provided with a second pin hole 14 and a second screw hole 15 .

[0065] More preferably, the number of the first pin holes 12 is two, and the number of the first screw holes 13 is two.

[0066] The number of the second pin holes 14 is two, and the number of the second screw holes 15 is three.

[0067] The thickness of the outermost part of the detachable blade root 9 is 1 / 3 of the thickness of the outermost part of the upper crown 1 .

[0068] This embodiment is the best implementation mode. There are two first pin holes 12 and two first screw holes 13, which is convenient for quickly determining the position of the detachable blade root 9 and improving the positioning efficiency.

[0069] The thickness of the outermost part of the detachable blade root 9 is 1 / 3 of the thickness of the outermost part of the upper crown 1 , which can ensure the structural strength of the entire upper crown 1 after grooving.

[0070] The model runner optimization process is as follows: Since the turbine model runner is usually assembled by combining the upper crown 1, the lower ring 3 and the blade 2, the three are tightly assembled into a whole by positioning pins and screws, or the three are assembled into one by welding. After the model runner has obtained its performance through experiments, multiple rounds of optimization are required to improve the performance parameters. Only some areas of the blade 2 need to be modified to perform optimization.

[0071] Therefore, when the present invention optimizes the model wheel, the blade 2 is set as a fixed part 4 and a detachable part 5, a first blade root groove 6 and a second blade root groove 7 are opened on the upper crown 1, a fixed blade root 8 is set on the first blade root groove 6, and a detachable blade root 9 is set on the second blade root groove 7. The detachable blade root 9 is connected to the detachable part 5 of the blade 2, and the fixed blade root 8 is connected to the fixed part 4 of the blade 2. The fixed part 4 is in contact with the detachable part 5, and the fixed blade root 8 is in contact with the detachable blade root 9. When it is necessary to modify part of the blade 2, the detachable blade root 9 can be replaced without reprocessing the entire blade 2, which is convenient for quickly optimizing the model wheel to improve the performance of the model wheel.

Claims

1. A turbine model runner, comprising an upper crown (1), blades (2) and a lower ring (3), wherein the upper crown (1), blades (2) and lower ring (3) are assembled and connected in sequence, and characterized in that: The blade (2) comprises a fixed portion (4) and a detachable portion (5); the upper crown (1) is provided with a first blade root groove (6) and a second blade root groove (7); the first blade root groove (6) is provided with a fixed blade root (8); the second blade root groove (7) is provided with a detachable blade root (9); the detachable blade root (9) is connected to the detachable portion (5) of the blade (2); the fixed blade root (8) is connected to the fixed portion (4) of the blade (2); the fixed portion (4) is in contact with the detachable portion (5); and the fixed blade root (8) is in contact with the detachable blade root (9).

2. A water turbine model runner according to claim 1, characterized in that: The width of the detachable blade root (9) is 8-10 mm wider than the width of the fixed blade root (8).

3. A water turbine model runner according to claim 1, characterized in that: The side wall of the detachable blade root (9) is straight and open outwards.

4. A water turbine model runner according to claim 1, characterized in that: The detachable blade root (9) is provided with a first rounded corner (10) and a second rounded corner (11), wherein the first rounded corner (10) and the second rounded corner (11) are close to one side of the fixed blade root (8).

5. A water turbine model runner according to claim 4, characterized in that: The first rounded corner (10) and the second rounded corner (11) are arranged correspondingly, and the rounded corner radii of the first rounded corner (10) and the second rounded corner (11) are both 7-10 mm.

6. A water turbine model runner according to claim 1, characterized in that: The detachable blade root (9) is provided with a first pin hole (12) and a first screw hole (13).

7. The turbine model runner according to claim 1, characterized in that: The fixed blade root (8) is provided with a second pin hole (14) and a second screw hole (15).

8. A water turbine model runner according to claim 6, characterized in that: There are two first pin holes (12) and two first screw holes (13).

9. A water turbine model runner according to claim 7, characterized in that: There are two second pin holes (14) and three second screw holes (15).

10. The water turbine model runner according to claim 1, characterized in that: The thickness of the outermost circumference of the detachable blade root (9) is 1 / 3 of the thickness of the outermost circumference of the upper crown (1).

Images