propeller

Abstract

The propeller belongs to the technical field of ship equipment, and comprises a plurality of blade assemblies and a rotating shaft; the blade assemblies are arranged at intervals along the circumference of the rotating shaft; each blade assembly comprises an edge blade, a middle blade and a root blade, the edge blade and the root blade are respectively located on opposite sides of the middle blade, the edge blade and the root blade are respectively detachably connected with the middle blade, and the root blade is connected with the rotating shaft. The propeller can reduce the use cost of the propeller while ensuring that the power efficiency of the propeller does not change.

Description

Technical Field

[0001] This disclosure pertains to the field of marine equipment technology, and particularly relates to a propeller. Background Technology

[0002] Propellers are a major component of all types of ships. They are used to propel ships forward in water.

[0003] In related technologies, in order to prevent propeller blades from being cavitated, an anti-cavitation coating is usually applied to the outer surface of the blades.

[0004] However, covering the outer surface of the blades with an anti-cavitation coating offers limited resistance to cavitation. Once cavitation occurs, the entire blade needs to be replaced, which is detrimental to controlling the propeller's operating costs. Summary of the Invention

[0005] This disclosure provides a propeller that reduces operating costs while maintaining propeller power efficiency. The technical solution is as follows:

[0006] This disclosure provides a propeller including a plurality of blade assemblies and a rotating shaft;

[0007] Each of the blade assemblies is arranged circumferentially along the rotation axis. Each blade assembly includes an edge blade, an intermediate blade, and a root blade. The edge blade and the root blade are located on opposite sides of the intermediate blade, and the edge blade and the root blade are detachably connected to the intermediate blade. The root blade is connected to the rotation axis.

[0008] In one implementation of this disclosure, the edge leaf has a first notch, the root leaf has a second notch, and the middle leaf is inserted into the first notch and the second notch respectively.

[0009] In another implementation of this disclosure, the intermediate blade includes a first insert, a connecting strip, and a second insert;

[0010] The first insert and the second insert are located on opposite sides of the connecting strip. The first end of the first insert is close to the first end of the connecting strip, and the second end of the first insert is connected to the second end of the connecting strip. The first end of the second insert is connected to the first end of the connecting strip, and the second end of the second insert is close to the second end of the connecting strip.

[0011] The first end of the first insert is inserted into the first notch, and the second end of the second insert is inserted into the second notch.

[0012] In another implementation of this disclosure, the first notch is located on the side of the edge blade, and the second notch is located on the side of the root blade.

[0013] In another implementation of this disclosure, the connection between the edge blade and the middle blade, as well as the connection between the root blade and the middle blade, both have locking structures.

[0014] In another implementation of this disclosure, the locking structure includes a plurality of first protrusions and a first groove;

[0015] The length direction of the first protrusion and the length direction of the first groove are perpendicular to the axis of the propeller, and the first protrusion is inserted into the first groove.

[0016] In another implementation of this disclosure, the blade assembly further includes a wedge block and a receiving groove, the receiving groove being located at at least one of the connection between the edge blade and the intermediate blade, and the connection between the root blade and the intermediate blade;

[0017] The wedge-shaped block is inserted into the receiving groove.

[0018] In another implementation of this disclosure, the wedge block has an included angle, the cross-section of the wedge block is an isosceles triangle, the vertex angle of the isosceles triangle is close to the leading edge of the propeller, the base angle of the isosceles triangle is close to the trailing edge of the propeller, and the base angle of the isosceles triangle is 75° to 80°.

[0019] In another implementation of this disclosure, the dimension of the wedge block along the length of the first notch is greater than the dimension of the receiving groove along the length of the first notch.

[0020] In another implementation of this disclosure, the outer wall of the wedge block has a plurality of second grooves, and the inner wall of the receiving groove has a plurality of second protrusions;

[0021] The length direction of the second protrusion and the length direction of the second groove are perpendicular to the axis of the propeller, and the second protrusion is inserted into the second groove.

[0022] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0023] Because the edge blades and root blades are detachably connected to the intermediate blades, each blade assembly is a modular structure. With the root blade connected to the rotation shaft, and the edge and root blades connected to the intermediate blades, the edge, intermediate, and root blades are supported by the rotation shaft. This allows the rotation shaft to rotate the edge, intermediate, and root blades together, generating a force against the water surface, thus enabling the ship to navigate in a forward direction.

[0024] During the operation of the propeller, if the edge blades, middle blades, or root blades of the blade assembly are subjected to cavitation or other damage, the staff can replace the edge blades, middle blades, or root blades individually instead of replacing the entire blade assembly, thus saving propeller operating costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the propeller structure provided in an embodiment of this disclosure;

[0027] Figure 2 This is a front view of the edge blade provided in an embodiment of this disclosure;

[0028] Figure 3 This is a side view of the edge blade provided in an embodiment of this disclosure;

[0029] Figure 4 This is a front view of the root blades provided in an embodiment of this disclosure;

[0030] Figure 5 This is a side view of the root blades provided in an embodiment of this disclosure;

[0031] Figure 6 This is a front view of the intermediate blade provided in an embodiment of this disclosure;

[0032] Figure 7 This is a side view of the intermediate blade provided in an embodiment of this disclosure;

[0033] Figure 8 This is a front view of the wedge block provided in an embodiment of this disclosure;

[0034] Figure 9 This is a top view of the wedge block provided in the embodiments of this disclosure;

[0035] Figure 10 This is a side view of the wedge block provided in an embodiment of this disclosure.

[0036] The symbols in the diagram represent the following meanings:

[0037] 1. Blade assembly;

[0038] 11. Edge blade; 111. First notch; 12. Middle blade; 121. First insert; 122. Connecting strip; 123. Second insert; 13. Root blade; 131. Second notch; 14. Locking structure; 141. First protrusion; 142. First groove; 15. Wedge block; 151. Second groove; 16. Receiving groove; 161. Second protrusion;

[0039] 2. Rotation axis. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0041] Propellers are a major component of all types of ships. They are used to propel ships forward in water.

[0042] In related technologies, in order to prevent propeller blades from being cavitated, an anti-cavitation coating is usually applied to the outer surface of the blades.

[0043] However, covering the outer surface of the blades with an anti-cavitation coating offers limited resistance to cavitation. Once cavitation occurs, the entire blade needs to be replaced, which is detrimental to controlling the propeller's operating costs.

[0044] To address the aforementioned technical problems, this disclosure provides a propeller. Figure 1 See the schematic diagram of the propeller structure. Figure 1 In this embodiment, the propeller includes multiple blade assemblies 1 and a rotating shaft 2. Each blade assembly 1 is arranged at intervals along the circumference of the rotating shaft 2. Each blade assembly 1 includes an edge blade 11, an intermediate blade 12 and a root blade 13. The edge blade 11 and the root blade 13 are located on opposite sides of the intermediate blade 12, and the edge blade 11 and the root blade 13 are detachably connected to the intermediate blade 12. The root blade 13 is connected to the rotating shaft 2.

[0045] Since the edge blades 11 and root blades 13 are detachably connected to the intermediate blades 12, each blade assembly 1 is an assembled structural component. With the root blade 13 connected to the rotating shaft 2, and the edge blades 11 and root blades 13 connected to the intermediate blades 12, the edge blades 11, intermediate blades 12, and root blades 13 are supported by the rotating shaft 2. Therefore, when the rotating shaft 2 rotates, it drives the edge blades 11, intermediate blades 12, and root blades 13 to rotate together, generating a force against the water against the ship, thus enabling the ship to sail forward.

[0046] During the operation of the propeller, if the edge blade 11, middle blade 12, or root blade 13 of the blade assembly 1 is subjected to cavitation or other damage, the operator can replace the edge blade 11, middle blade 12, or root blade 13 individually, instead of replacing the entire blade assembly 1, thus saving the propeller's operating costs.

[0047] For example, since the intensity of cavitation is positively correlated with the blade's speed, the degree of cavitation affects different components in blade assembly 1, resulting in different service lives for each component. Correspondingly, under normal circumstances, blades farther from the rotation shaft 2 are most severely affected by cavitation, while blades closer to the rotation shaft 2 experience less cavitation. Because the edge blade 11 is located at the end of blade assembly 1 furthest from the rotation shaft 2, it is more susceptible to cavitation damage than the middle blade 12 and the root blade 13. Therefore, workers can replace the edge blade 11 individually, eliminating the need to replace the entire blade assembly 1, thus saving the cost of replacing the propeller blade assembly 1 in ships.

[0048] For example, in practical applications, based on the maintenance records of the blade assembly 1 in a certain type of ship propeller, it is expected that the staff will replace the middle blade 12 once every three or more replacements of the edge blade 11, while the root blade 13 will basically not need to be replaced during this period.

[0049] For example, each blade assembly 1 can be made of bronze, brass, or a mixture of bronze and brass. Brass has good strength and hardness, which can improve the reliability of each blade assembly 1. At the same time, brass also has good machinability and ductility, which is beneficial for the connection between the blade assemblies 1. Bronze has high strength, good wear resistance and corrosion resistance, which can enable each blade assembly 1 to operate stably in the underwater environment for a long time. It can also withstand higher loads, improving the stability of the propeller.

[0050] For example, the blade assembly 1 does not change the shape of the blades on the original propeller of the ship, thereby maintaining the hydrodynamic efficiency of the original propeller. This ensures that the original ship can be put into normal use directly after replacing the original propeller with the propeller provided in this embodiment. At the same time, replacing any component of the blade assembly 1 will not affect the normal use of the blade assembly 1 again.

[0051] Optionally, the rotation axis 2 is a regular hexagonal structure.

[0052] Optionally, the propeller has three blade assemblies 1, which are arranged at intervals along the circumference of the rotation axis 2, and the blade assemblies 1 of the three propellers are arranged at intervals along the circumference of the rotation axis 2 and are connected in a one-to-one correspondence.

[0053] Figure 2 This is the front view of the edge blade. Figure 3 This is a side view of the edge blade. Figure 4 This is a front view of the root leaves. Figure 5 This is a side view of the root and leaves, combined with... Figure 2 , Figure 3 , Figure 4 and Figure 5 In this embodiment, the edge blade 11 has a first notch 111, the root blade 13 has a second notch 131, and the middle blade 12 is respectively inserted into the first notch 111 and the second notch 131.

[0054] Since the edge blade 11 has a first notch 111 and the root blade 13 has a second notch 131, one end of the middle blade 12 can be inserted into the first notch 111 and the other end of the middle blade 12 can be inserted into the second notch 131. The connection between the middle blade 12 and the first notch 111 and the second notch 131 makes the disassembly process between the edge blade 11 and the root blade 13 and the middle blade 12 more convenient.

[0055] Furthermore, since the edge leaf 11 and the root leaf 13 are located on opposite sides of the middle leaf 12, the first notch 111 and the second notch 131 are also located on opposite sides of the middle leaf 12, so that the middle leaf 12 can be connected to the edge leaf 11 and the root leaf 13 respectively.

[0056] For example, the propeller rotation direction is Figure 1 Rotate counterclockwise in the state shown (direction of the solid arrow in the figure).

[0057] For example, the inner wall of the first notch 111 near the propeller guide edge can be arc-shaped. It can also be square or other shapes, without specific limitations here.

[0058] For example, the inner wall of the second notch 131 near one end of the propeller can be square. It can also be other shapes such as arc, without being specifically limited here.

[0059] Figure 6 This is the front view of the middle blade. Figure 7 This is a side view of the middle blade, combined with... Figure 6 and Figure 7 In this embodiment, the intermediate blade 12 includes a first insert 121, a connecting strip 122, and a second insert 123. The first insert 121 and the second insert 123 are located on opposite sides of the connecting strip 122. The first end of the first insert 121 is close to the first end of the connecting strip 122, and the second end of the first insert 121 is connected to the second end of the connecting strip 122. The first end of the second insert 123 is connected to the first end of the connecting strip 122, and the second end of the second insert 123 is close to the second end of the connecting strip 122. The first end of the first insert 121 is inserted into the first notch 111, and the second end of the second insert 123 is inserted into the second notch 131.

[0060] Since the first insert 121 and the second insert 123 are located on opposite sides of the connecting strip 122, and the edge blade 11 and the root blade 13 are located on opposite sides of the middle blade 12, the first insert 121 is positioned closer to the edge blade 11, and the second insert 123 is positioned closer to the root blade 13. The second end of the first insert 121 is connected to the second end of the connecting strip 122, allowing the connecting strip 122 to support the first insert 121. Furthermore, the first end of the first insert 121 is close to the first end of the connecting strip 122, ensuring that the length direction of the first insert 121 is consistent with the length direction of the connecting strip 122. Similarly, the second end of the second insert 123 is connected to the second end of the connecting strip 122, allowing the connecting strip 122 to support the second insert 123. The first end of the second insert 123 is close to the first end of the connecting strip 122, ensuring that the length direction of the second insert 123 is consistent with the length direction of the connecting strip 122. This results in a more compact structure for the middle blade 12.

[0061] Since the first end of the first insert 121 is inserted into the first notch 111, the contact area between the middle blade 12 and the edge blade 11 can be increased, thereby enhancing the stability of the connection between the middle blade 12 and the edge blade 11.

[0062] Similarly, since the second end of the second insert 123 is inserted into the second notch 131, the contact area between the middle leaf 12 and the root leaf 13 can be increased, thereby enhancing the stability of the connection between the middle leaf 12 and the root leaf 13.

[0063] For example, when the propeller rotates at high speed, the edge blades 11, middle blades 12, and root blades 13 in the blade assembly 1 are all subjected to centrifugal force in a tangential direction perpendicular to the rotation path, causing them to tend to displace away from the rotation axis 2. By inserting the first insert 121 and the second insert 123 one-to-one into the first notch 111 and the second notch 131, with the length direction of the first insert 121 and the second insert 123 perpendicular to the direction of the centrifugal force, it can be ensured that the edge blades 11, middle blades 12, and root blades 13 will not loosen due to the centrifugal force. This design can improve the stability of the blade assembly 1 to a certain extent and also improve the reliability of the propeller during use.

[0064] For example, the outer wall of the first insert 121 near the propeller guide edge can be arc-shaped, and its shape should be consistent with the inner wall shape within the first notch 111.

[0065] For example, the outer wall of the second insert 123 near the propeller side can be square, and its shape should be consistent with the inner wall shape within the first notch 111.

[0066] See you again Figure 1 In this embodiment, the first notch 111 is located on the side of the edge blade 11, and the second notch 131 is located on the side of the root blade 13.

[0067] like Figure 1 As shown, the propeller rotates in the following direction: Figure 1 Rotate counterclockwise in the state shown. The first notch 111 is set on the side of the edge blade 11, that is, the side away from the direction of the blade assembly 1. The second notch 131 is set on the side of the guide edge of the root blade 13, that is, the side close to the direction of the blade assembly 1. This helps to improve the stability of the blade assembly 1 when it rotates at high speed.

[0068] When the blade assembly 1 rotates, the side closer to the propeller's direction of rotation is the guide edge, and the other side is the trailing edge. The guide edge drives the trailing edge to rotate. The direction of the force exerted by the intermediate blade 12 on the root blade 13 is consistent with the direction of the propeller's guide edge towards the trailing edge. Therefore, the intermediate blade 12 has a thrust on the root blade 13 in the direction of the force. By fixing the root blade 13 to the rotating shaft 2 and setting the second notch 131 on one side of the guide edge of the root blade 13, the intermediate blade 12 is inserted into the second notch 131, thereby enabling the root blade 13 to stably support the intermediate blade 12 and improve the stability of the blade assembly 1.

[0069] Similarly, one end of the middle blade 12 is inserted into the first notch 111 on the side of the edge blade 11 away from the blade assembly 1. When the blade assembly 1 rotates, the edge blade 11 is subjected to thrust from the water. The direction of the thrust is consistent with the direction of the propeller's guide edge toward the trailing edge. At this time, the middle blade 12 can stably support the edge blade 11, improving the stability of the blade assembly 1.

[0070] See you again Figure 2 , Figure 4 and Figure 6 In this embodiment, the connection between the edge blade 11 and the middle blade 12, and the connection between the root blade 13 and the middle blade 12, both have a locking structure 14.

[0071] The locking structure 14 can improve the fastening effect at the joint of the edge blade 11, the middle blade 12 and the root blade 13, and prevent the edge blade 11, the middle blade 12 and the root blade 13 from loosening when the blade assembly 1 rotates.

[0072] For example, when the propeller rotates at high speed, the rotating shaft 2 transmits rotational power to the root blade 13. The root blade 13 transmits rotational power to the intermediate blade 12 through the second notch 131, the second insert 123, and the locking structure 14. The intermediate blade 12 then transmits rotational power to the outer blades through the first notch 111, the first insert 121, and the locking structure 14. During the power transmission process, the locking structure 14 ensures that the connection between the outer blades, the intermediate blades 12, and the root blade 13 is tighter and more secure, preventing loosening.

[0073] Figure 8 This is the main structural view of the wedge block. Figure 9 This is a top view of the wedge block structure. Figure 10 This is a side view of the wedge block structure, combined with... Figure 8 , Figure 9 and Figure 10 In this embodiment, the locking structure 14 includes a plurality of first protrusions 141 and first grooves 142. The length direction of the first protrusions 141 and the length direction of the first grooves 142 are perpendicular to the axis of the propeller, and the first protrusions 141 are inserted into the first grooves 142.

[0074] By interlocking the first protrusions 141 and the first grooves 142, the stability and structural strength of the blade assembly 1 can be improved to a certain extent. At the same time, since the length directions of the first protrusions 141 and the first grooves 142 are perpendicular to the axis of the propeller, the connection between the edge blades 11, the middle blades 12 and the root blades 13 can be prevented from loosening due to the rotation of the propeller, thereby improving the stability of the blade assembly 1.

[0075] For example, a portion of the first protrusion 141 is located on the outer wall of the connecting surface of the edge blade 11, and there is a gap between them. A portion of the first groove 142 is located on the outer wall of the connecting strip 122, and there is a gap between them. The first protrusion 141 on the edge blade 11 is inserted into the first groove 142 on the connecting strip 122. This increases the connection strength between the edge blade 11 and the middle blade 12.

[0076] For example, a portion of the first protrusion 141 is located on the outer wall of the first insert 121 and has a gap between them. A portion of the first groove 142 is located on the inner wall of the first notch 111 and has a gap between them. The first protrusion 141 on the first insert 121 is inserted into the first groove 142 on the first notch 111. This further improves the stability of the connection between the edge blade 11 and the middle blade 12.

[0077] For example, a portion of the first protrusion 141 is located on the outer wall of the second insert 123 and has a gap between them. A portion of the first groove 142 is located on the inner wall of the second notch 131 and has a gap between them. The first protrusion 141 on the second insert 123 is inserted into the first groove 142 on the second notch 131. This increases the connection strength between the root leaf 13 and the middle leaf 12.

[0078] For example, a portion of the first protrusion 141 is located on the outer wall of the root blade 13 and has a gap between them. A portion of the first groove 142 is located on the outer wall of the connecting strip 122 and has a gap between them. The first protrusion 141 of the root blade 13 is inserted into the first groove 142 on the connecting strip 122. This further improves the stability of the connection between the root blade 13 and the intermediate blade 12.

[0079] Optionally, both the first protrusion 141 and the first groove 142 are semi-cylindrical. The semi-cylindrical shape facilitates a more convenient connection between the edge blades 11, the middle blades 12, and the root blades 13. It also helps to prevent the connection between the edge blades 11, the middle blades 12, and the root blades 13 from becoming loose.

[0080] See you again Figure 1 In this embodiment, the blade assembly 1 further includes a wedge block 15 and a receiving groove 16. The receiving groove 16 is located at at least one of the connection between the edge blade 11 and the middle blade 12, and the connection between the root blade 13 and the middle blade 12. The wedge block 15 is inserted into the receiving groove 16.

[0081] The receiving groove 16 can be located at at least one of the connections between the edge blade 11 and the middle blade 12, and between the middle blade 12 and the root blade 13, and can be assembled with the wedge block 15, which helps to improve the stability of the blade assembly 1. By applying pressure to the wedge block 15 and pressing it into the receiving groove 16, the outer wall of the wedge block 15 can compress the side walls of the receiving groove 16, thereby making the connection between the edge blade 11, the middle blade 12 and the root blade 13 more stable.

[0082] For example, there are two receiving slots 16. One receiving slot 16 is located inside the edge blade 11 and within the clamping space between the first notch 111 and the connecting strip 122. When the wedge block 15 is inserted into the receiving slot 16, the connection between the edge blade 11 and the middle blade 12 is made more stable by pressing the inner wall of the receiving slot 16. The other receiving slot 16 is located near the trailing end of the second insert 123 near the propeller. When the wedge block 15 is inserted into the receiving slot 16, the contact surface between the root blade 13 and the middle blade 12 is made more closely fitted by pressing the inner wall of the receiving slot 16, thereby improving stability.

[0083] For example, the receiving groove 16 can be a V-shaped groove. It can also be a U-shaped groove or other shapes to facilitate the installation of the wedge block 15.

[0084] See you again Figure 8 In this embodiment, the cross-section of the wedge block 15 is an isosceles triangle, with the vertex angle of the isosceles triangle close to the leading edge of the propeller and the base angle α of the isosceles triangle close to the trailing edge of the propeller. The base angle α of the isosceles triangle is 75° to 80°.

[0085] Setting the base angle α of the wedge block 15 to 75°–80° ensures that, during the process of reinforcing the connection between the edge blade 11, the middle blade 12, and the root blade 13, when subjected to the compressive force from the edge blade 11, the middle blade 12, and the root blade 13 on the outer wall of the wedge block 15, the horizontal component of the compressive force will be much smaller than the sliding friction force between the wedge block 15 and the contact surfaces of the edge blade 11, the middle blade 12, and the root blade 13, respectively. This effectively prevents the wedge block 15 from being squeezed out of the receiving groove 16. Consequently, the stability of the wedge block 15 can be improved to a certain extent, and the reliability of the blade assembly 1 can be enhanced.

[0086] See you again Figure 2 , Figure 6 and Figure 9 In this embodiment, the dimension L1 of the wedge block 15 along the length direction of the first notch 111 is greater than the dimension L2 of the receiving groove 16 along the length direction of the first notch 111.

[0087] Since the length L1 of the wedge block 15 extending along the first notch 111 is greater than the length L2 of the receiving groove 16 extending along the first notch 111, the contact area between the wedge block 15 and the edge blade 11, the middle blade 12, and the root blade 13 can be increased to a certain extent, thereby improving the stability of the wedge block 15 when fastening the edge blade 11, the middle blade 12, and the root blade 13. Furthermore, the wedge block 15 can exert greater pressure on the two side walls of the receiving groove 16, thereby making the connection between the wedge block 15 and the edge blade 11, the middle blade 12, and the root blade 13 more secure. This further enhances the stability of the blade assembly 1.

[0088] See also Figure 2 , Figure 6 and Figure 9 In this embodiment, the outer wall of the wedge block 15 has a plurality of second grooves 151, and the inner wall of the receiving groove 16 has a plurality of second protrusions 161. The length direction of the second protrusions 161 and the length direction of the second grooves 151 are perpendicular to the axis of the propeller, respectively, and the second protrusions 161 are inserted into the second grooves 151.

[0089] Each second protrusion 161 is inserted into each second groove 151, which makes the connection between the wedge block 15 and the receiving groove 16 more stable.

[0090] Furthermore, taking the tip of the blade assembly 1 (i.e., the apex of the blade assembly 1 to the rotation axis 2) as the dividing line, the edge blades 11, the middle blades 12, and the root blades 13 are arranged sequentially and connected to each other along this dividing line. The arrangement direction of the edge blades 11, the middle blades 12, and the root blades 13 is perpendicular to the axis of the propeller. Therefore, since the length direction of the second protrusion 161 and the length direction of the second groove 151 are perpendicular to the axis of the propeller, the force direction of the middle blade 12 on the root blade 13 and the force direction of the edge blade 11 on the middle blade 12 are both along the direction from the guide edge to the trailing edge of the propeller. This helps to prevent the edge blades 11, the middle blades 12, and the root blades 13 from becoming loose, and strengthens the connection stability between the edge blades 11, the middle blades 12, and the root blades 13 in the blade assembly 1. This further improves the stability and reliability of the propeller.

[0091] For example, each second groove 151 is located on the outer wall of the wedge-shaped block 15 and has a gap between them. Each second protrusion 161 is located on the inner wall of the receiving groove 16 and has a gap between them. Each second groove 151 corresponds to and is connected to each second protrusion 161.

[0092] Optionally, both the second protrusion 161 and the second groove 151 are semi-cylindrical. The semi-cylindrical shape facilitates the easier insertion of the wedge block 15 between the edge blade 11, the middle blade 12, and the root blade 13. It also helps to prevent the connection between the wedge block 15 and the edge blade 11, the middle blade 12, and the root blade 13 from becoming loose.

[0093] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A propeller, characterized in that The propeller comprises a plurality of blade assemblies (1) and a rotating shaft (2); Each of the blade assemblies (1) is arranged along the circumference of the rotating shaft (2), and each of the blade assemblies (1) comprises an edge blade (11), a middle blade (12) and a root blade (13), the edge blade (11) and the root blade (13) are respectively located on opposite sides of the middle blade (12), and the edge blade (11) and the root blade (13) are respectively detachably connected with the middle blade (12), and the root blade (13) is connected with the rotating shaft (2); The edge blade (11) has a first notch (111), the root blade (13) has a second notch (131), and the middle blade (12) is respectively inserted into the first notch (111) and the second notch (131), the first notch (111) is located on the trailing side of the edge blade (11), and the second notch (131) is located on the leading side of the root blade (13); The middle blade (12) comprises a first insertion strip (121), a connecting strip (122) and a second insertion strip (123), the first insertion strip (121) and the second insertion strip (123) are respectively located on opposite sides of the connecting strip (122), a first end of the first insertion strip (121) is close to a first end of the connecting strip (122), a second end of the first insertion strip (121) is connected with a second end of the connecting strip (122), a first end of the second insertion strip (123) is connected with the first end of the connecting strip (122), and a second end of the second insertion strip (123) is close to the second end of the connecting strip (122), the first end of the first insertion strip (121) is inserted into the first notch (111), and the second end of the second insertion strip (123) is inserted into the second notch (131).

2. The propeller of claim 1, wherein The connection between the edge blade (11) and the middle blade (12) and the connection between the root blade (13) and the middle blade (12) both have a locking structure (14).

3. The propeller of claim 2, wherein, The locking structure (14) comprises a plurality of first protrusions (141) and first recesses (142); The length direction of the first protrusions (141) and the length direction of the first recesses (142) are both perpendicular to the axis of the propeller, and the first protrusions (141) are inserted into the first recesses (142).

4. The propeller of claim 1, wherein, The blade assembly (1) further comprises a wedge-shaped block (15) and a receiving groove (16); The receiving groove (16) is located at least one of the connection between the edge blade (11) and the middle blade (12) and the connection between the root blade (13) and the middle blade (12); The wedge-shaped block (15) is inserted into the receiving groove (16).

5. The propeller of claim 4, wherein, The cross section of the wedge-shaped block (15) is an isosceles triangle, the apex angle of the isosceles triangle is close to the leading edge of the propeller, the base angle of the isosceles triangle is close to the trailing edge of the propeller, and the base angle (α) of the isosceles triangle is 75°-80°.

6. The propeller of claim 4, wherein, The size (L1) of the wedge-shaped block (15) along the length direction of the first gap (111) is greater than the size (L2) of the accommodating groove (16) along the length direction of the first gap (111).

7. The propeller of claim 4, wherein, The outer wall of the wedge-shaped block (15) has a plurality of second grooves (151), and the inner wall of the accommodating groove (16) has a plurality of second protrusions (161). The length direction of the second protrusion (161) and the length direction of the second groove (151) are perpendicular to the axis of the propeller respectively, and the second protrusion (161) is inserted into the second groove (151).

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