Straight wing propeller

Abstract

The utility model discloses a straight wing propeller, which comprises a turntable, blades and a blade driving mechanism, the blade driving mechanism is arranged in the turntable, a plurality of blade assembling shaft holes are distributed on the bottom surface of the turntable along the surface of the turntable, a blade assembling shaft is correspondingly arranged in each blade assembling shaft hole, the blade root parts of the blades are fixedly connected with the blade assembling shafts, and the blade root parts of the blades are fixedly connected with the blade assembling shafts. The paddle driving device is movably connected with the paddle assembling shafts respectively, the paddle driving device drives the paddle assembling shafts to rotate so as to drive the paddle to rotate, and the front edge of the paddle is provided with a concave-convex surface imitating a seathead whale fin limb node. According to the straight wing propeller disclosed by the utility model, the concave-convex surface imitating the seathead whale fin limb node is arranged at the front edge of the propeller blade, and hydrodynamic analysis shows that when the straight wing propeller works, the propeller blade can decompose a vortex and accelerate diffusion of the vortex, so that the cavitation performance of the propeller blade can be effectively improved, and the service life of the propeller blade is prolonged. Noise of the straight-wing propeller is reduced, and comfort and concealment of the ship are improved.

Description

Technical Field

[0001] The utility model relates to the field of ship propellers, in particular to a straight-wing propeller. Background Art

[0002] With the development and progress of science and technology, propeller design pays more and more attention to the cavitation performance and noise performance of the blades, that is, to reduce cavitation and noise as much as possible while meeting the efficiency requirements, effectively improving the life of the ship and the comfort of the people on board, which is especially important for passenger ships.

[0003] Straight wing propellers are also called cycloidal propellers. They are made by installing several straight wing blades on a special flat disc. These blades can not only rotate with the disc, but also rotate themselves through the control mechanism. The blades act like wings. Water flows over the surface, generating hydrodynamic force, which is then converted into ship power. The speed and sailing direction of the ship can be freely controlled by controlling the control mechanism.

[0004] At present, the cavitation performance of the blades of existing straight-wing propellers is poor and the noise is relatively loud during operation, so they need to be improved. Summary of the invention

[0005] The utility model aims to provide a straight-wing propeller in view of the problems that the blades of the existing straight-wing propellers described in the background technology have poor cavitation performance and produce high noise during operation.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions: a straight-wing propeller, including a turntable, a blade and a blade driving mechanism, the blade driving mechanism is arranged in the turntable, and a plurality of blade assembly shaft holes are distributed on the bottom surface of the turntable along the turntable surface, each blade assembly shaft hole is correspondingly provided with a blade assembly shaft, the root of the blade is fixedly connected to the blade assembly shaft, the blade driving device is movably connected to each blade assembly shaft, and the rotation of each blade assembly shaft is driven by the blade driving device, thereby driving the blade to rotate, and the leading edge of the blade is provided with a concave and convex surface imitating the fin tubercle of a humpback whale.

[0007] In the above scheme, on the blade, the chord length and thickness of the blade gradually decrease from the blade root to the blade tip.

[0008] In the above scheme, the function expression of the projection curve of the concave-convex surface of the humpback whale flipper tubercle is:

[0009]

[0010] Where: Y is the height of the protrusion at any point on the projection curve, in mm;

[0011] X is the distance from any point on the projection curve to the blade root, in mm;

[0012] L is the blade length, unit: mm.

[0013] In the above scheme, a driving disk is further provided on a side surface of the turntable away from the blades. The driving disk is arranged in the middle of the turntable and is used to connect to the turntable rotation drive device.

[0014] In the above scheme, the blade driving device includes a motor and a crank-connecting rod mechanism, the output shaft of the motor is connected to one end of the crank-connecting rod mechanism, and the other end of the crank-connecting rod mechanism is movably connected to the blade assembly shaft.

[0015] The utility model has positive effects: the straight-wing propeller of the utility model has a concave-convex surface imitating the tubercles of the flipper of a humpback whale on the leading edge of the blade. Through hydrodynamic analysis, it is found that by setting the concave-convex surface imitating the tubercles of the flipper of a humpback whale on the blade, the blade can decompose the vortex and accelerate the diffusion of the vortex when the straight-wing propeller is working, thereby effectively improving the cavitation performance of the blade, reducing the noise of the straight-wing propeller, and improving the comfort and concealment of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the straight-wing propeller of the utility model.

[0017] Figure 2 It is a schematic diagram of the structure of the blade of the utility model.

[0018] Figure 3 It is a schematic diagram of the structure of the blade drive mechanism in the turntable.

[0019] The reference numerals in the figure are: rotating disk 1, blade 2, blade root 21, blade tip 22, leading edge 23, trailing edge 24, concave and convex surface 25, blade driving mechanism 3, driving disk 4, blade assembly shaft 5. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is described clearly and completely below through embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1 and Figure 2 A straight-wing propeller shown includes a turntable 1, blades 2 and a blade driving mechanism 3.

[0022] The turntable 1 is a hollow disc-shaped structure. A plurality of blade assembly shaft holes are distributed along the bottom surface of the turntable 1 . A blade assembly shaft 5 is correspondingly provided in each blade assembly shaft hole. The blade root 21 of the blade 2 is fixedly connected to the blade assembly shaft 5 .

[0023] A driving disk 4 is provided on the top surface of the turntable 1. The driving disk 4 is arranged in the middle of the turntable 1. The driving disk 4 is used to connect to the turntable rotation driving device. The turntable rotation driving device can drive the turntable 1 to rotate, and then drive the blades 2 on the bottom surface of the turntable to rotate accordingly.

[0024] like Figure 3 As shown, the blade driving mechanism 3 is arranged in the turntable 1, and the blade driving device 3 includes a motor and a crank-connecting rod mechanism. The output shaft of the motor is connected to one end of the crank-connecting rod mechanism, and the other end of the crank-connecting rod mechanism is movably connected to the blade assembly shaft. Figure 3 The structure of a blade drive mechanism is shown in the figure. The blade drive mechanism includes a star-shaped drive member arranged in the middle of the turntable. A connecting arm connected to each crank connecting rod is arranged on the star-shaped drive member. The output shaft of the motor can drive one end of the connecting rod of each crank connecting rod mechanism to move through the star-shaped drive member. The other end of the connecting rod can drive the blade assembly axis to swing within a certain angle range through the crankshaft, thereby driving the blade to swing. The number of connecting rods in the crank connecting rod mechanism is consistent with the number of blades, and each blade is driven by a corresponding crankshaft connecting rod. Through this arrangement, the blades can swing around their respective blade assembly axes while rotating with the turntable, ensuring that the blades and the water flow form a certain angle of attack to generate thrust.

[0025] The blade 2 is an elongated blade, and a blade root 21 of the blade 2 is fixedly connected to the blade assembly shaft 5. The end of the blade 2 away from the blade root 21 is a blade tip 22. From the blade root 21 to the blade tip 22, the thickness of the blade 2 gradually decreases. The two sides of the blade 2 are a leading edge 23 and a trailing edge 24, respectively. The distance between the leading edge 23 and the trailing edge 24 is the chord length. From the blade root 21 to the blade tip 22, the chord length of the blade 2 gradually decreases. A concave-convex surface 25 imitating the tubercle of the flipper of a humpback whale is provided on the leading edge 23 of the blade 2. Moreover, from the blade root 21 to the blade tip 22, the peak value of the concave-convex surface 25 gradually decreases, that is, the degree of concave-convexity gradually decreases, forming a smooth transition.

[0026] The function expression of the projection curve of the concave and convex surface of the humpback whale flipper tubercle is:

[0027]

[0028] Where: Y is the height of the protrusion at any point on the projection curve, in mm;

[0029] X is the distance from any point on the projection curve to the blade root, in mm;

[0030] L is the blade length, unit: mm.

[0031] The straight-wing propeller of the utility model is provided with a concave-convex surface imitating the tubercles of the flipper of a humpback whale on the leading edge of the blade. Through hydrodynamic analysis, it is found that by providing the concave-convex surface imitating the tubercles of the flipper of a humpback whale on the blade, the blade can decompose the vortex and accelerate the diffusion of the vortex when the straight-wing propeller is working, thereby effectively improving the cavitation performance of the blade and reducing the noise of the straight-wing propeller.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A straight wing propeller, characterized in that: The invention comprises a turntable, a paddle and a paddle driving mechanism, wherein the paddle driving mechanism is arranged in the turntable, and a plurality of paddle assembly shaft holes are distributed on the bottom surface of the turntable along the turntable surface, and a paddle assembly shaft is correspondingly arranged in each paddle assembly shaft hole, and the root of the paddle is fixedly connected to the paddle assembly shaft, and the paddle driving device is movably connected to each paddle assembly shaft, and the rotation of each paddle assembly shaft is driven by the paddle driving device, thereby driving the rotation of the paddle, and the leading edge of the paddle is provided with a concave-convex surface imitating the tubercle of the flipper of a humpback whale.

2. The straight wing propeller according to claim 1, characterized in that: On the blade, the chord length and thickness of the blade gradually decrease from the blade root to the blade tip.

3. The straight wing propeller according to claim 1, characterized in that: The function expression of the projection curve of the concave-convex surface of the humpback whale flipper tubercle is: Where: Y is the height of the protrusion at any point on the projection curve, in mm; X is the distance from any point on the projection curve to the blade root, in mm; L is the blade length, unit: mm.

4. The straight wing propeller according to claim 1, characterized in that: A driving disc is also provided on a side surface of the turntable away from the blades. The driving disc is arranged in the middle of the turntable and is used to connect to the turntable rotation driving device.

5. The straight wing propeller according to claim 1, characterized in that: The blade driving device comprises a motor and a crank-connecting rod mechanism, wherein the output shaft of the motor is connected to one end of the crank-connecting rod mechanism, and the other end of the crank-connecting rod mechanism is movably connected to the blade assembly shaft.

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