Marine propeller cap turbine with wedge-shaped fins

Abstract

The invention belongs to the field of ship manufacturing, and discloses a marine propeller cap turbine with wedge-shaped fins, which is mounted behind a propeller of a ship. The marine propeller cap turbine with the wedge-shaped fins comprises a turbine body and the wedge-shaped fins, the wedge-shaped fins are evenly distributed on the side face of the turbine body, the pitch angles of the wedge-shaped fins are the same, and the pitch angles of the wedge-shaped fins are the same as the average value of the pitch angles of a propeller in the range of 0.4 R-0. 9R. The wake flow rotation kinetic energy generated by the propeller in the interval of 0.4 R-0. 9R is high, the area contributes about large thrust, when the pitch angle of the wedge-shaped fin blades is consistent with the average pitch angle of the interval, the circumferential rotation component of the wake flow can be efficiently counteracted, the kinetic energy of the waste vortex flow is converted into the axial additional thrust, energy consumption is reduced, the operation efficiency of the propeller is improved, the design link is optimized, and the design cost is reduced. And the design efficiency is improved. Moreover, the circumferential installation angle does not need to be considered during installation, the installation difficulty is lowered, the risks of installation deviation and installation mistakes are avoided, and installation is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shipbuilding, in particular to a propeller cap turbine with wedge-shaped fin leaves for ships. BACKGROUND

[0002] When the ship is sailing, the propeller rotates at high speed behind the ship and pushes the ship forward, and a large amount of vortex is generated at the propeller hub position, which extends along the propeller hub, the cap to the propeller. According to the conservation of energy, the movement of water in the vortex consumes energy, which reduces the propeller propulsion efficiency. In order to reduce energy consumption, energy-saving technology has emerged. This technology has been widely studied at home and abroad, and has made practical progress. Among many propeller energy-saving technologies, the propeller cap turbine not only has considerable energy-saving effect, but also has the advantages of simple structure, high reliability and low cost. Especially on ships with large hub vortex and large propeller pitch, it can achieve certain effect, so it is one of the most widely used hydrodynamic energy-saving products in the current ship market.

[0003] There are many ways to eliminate the propeller hub vortex, and the propeller cap turbine is one of the more effective ones. The propeller cap turbine can weaken or eliminate the hub vortex by arranging fin leaves on the cap to disperse the vortex generated by the rotation of the propeller root, thereby saving the power of the main engine. The propeller cap turbine can also absorb the energy of the propeller wake to generate a certain thrust on the fin leaves, thereby improving the overall thrust of the propeller and achieving the purpose of increasing efficiency. Through the above two mechanisms, the propeller cap turbine can reduce the energy consumption of the ship and improve the operating efficiency of the propeller.

[0004] In the prior art, when designing the propeller cap turbine, the number of fin leaves of the propeller cap turbine is generally the same as the number of propeller blades. During installation, special attention should be paid to the circumferential relative position of the fin leaves and the propeller blades, and a large amount of design verification is often required to achieve the optimal effect. There is a risk of misalignment and misinstallation during installation, which affects the energy-saving effect and makes the installation more troublesome.

[0005] Therefore, there is an urgent need for a propeller cap turbine with wedge-shaped fin leaves for ships to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a propeller cap turbine with wedge-shaped fin leaves for ships to solve the problem of low design efficiency, troublesome installation and the risk of misalignment and misinstallation of the propeller cap turbine in the prior art.

[0007] As conceived above, the technical solution adopted by the present application is:

[0008] The application discloses a propeller cap turbine with wedge-shaped fin blades for ships, which is installed behind a propeller of a ship and comprises a turbine body and a plurality of wedge-shaped fin blades which are uniformly distributed on the outer side of the turbine body and have the same pitch angle, and the pitch angle of the wedge-shaped fin blades is the same as the average value of the pitch angle of the propeller at the interval of 0.4R-0.9R.

[0009] Further, the turbine body is in a cylindrical shape, one end of the turbine body is an open end in the axial direction, and the open end is connected to the small end of the propeller hub.

[0010] Further, the propeller cap turbine with wedge-shaped fin blades for ships further comprises a plurality of fixing members, a plurality of fixing holes are arranged on the outer side of the turbine body close to the open end, the plurality of fixing members and the fixing holes are arranged one by one, and the plurality of fixing holes are arranged one by one with the plurality of bolt holes of the small end of the propeller hub, and the fixing members can be located in the corresponding fixing holes and bolt holes.

[0011] Further, the turbine body is further provided with a plurality of fixing grooves, and the plurality of fixing grooves correspond to the plurality of fixing holes one by one, and the fixing holes are arranged in the corresponding fixing grooves.

[0012] Further, the diameter of the turbine body is 0.1-0.2 times the diameter of the propeller.

[0013] Further, in the radial direction of the turbine body, the length of the wedge-shaped fin blades is 0.2-0.4 times the diameter of the turbine body.

[0014] Further, in the radial direction of the turbine body, the thickness of the wedge-shaped fin blades gradually decreases.

[0015] Further, in the axial direction of the turbine body, the length of the wedge-shaped fin blades is smaller than the length of the turbine body.

[0016] Further, the number of the wedge-shaped fin blades is 5-10.

[0017] Further, the end of the wedge-shaped fin blades away from the turbine body is rounded.

[0018] The application has the following beneficial effects:

[0019] The application provides a propeller cap turbine with wedge-shaped fin blades for ships, which is installed behind a propeller of a ship. The propeller cap turbine with wedge-shaped fin blades for ships comprises a turbine body and a plurality of wedge-shaped fin blades, the plurality of wedge-shaped fin blades are uniformly distributed on the side of the turbine body, the pitch angles of the plurality of wedge-shaped fin blades are the same, and the pitch angle of the wedge-shaped fin blades is the same as the average value of the pitch angle of the propeller in the 0.4R-0.9R interval. The wake rotation kinetic energy generated by the propeller in the 0.4R-0.9R interval is relatively strong, this area contributes to a relatively large thrust, when the pitch angle of the wedge-shaped fin blades is consistent with the average pitch angle in the interval, the circumferential rotation component of the wake can be efficiently offset, the waste vortex kinetic energy can be converted into axial additional thrust, the energy consumption can be reduced, and the operation efficiency of the propeller can be improved. That is, when the propeller cap turbine is designed, only the average value of the pitch angle of the wedge-shaped fin blades and the pitch angle in the interval needs to be ensured, the energy consumption can be reduced, the operation efficiency of the propeller can be improved, the circumferential relative position, the trim, the skew and other geometric parameters of the wedge-shaped fin blades and the propeller blades do not need to be considered, the design link is optimized, and the design efficiency is improved. Moreover, the circumferential installation angle does not need to be considered when the propeller cap turbine is installed, the installation difficulty is reduced, the risk of misalignment and misinstallation is avoided, and the installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the contents of the embodiments of the present application and the drawings without any creative effort.

[0021] Figure 1 is a structural schematic diagram of the propeller cap turbine with wedge-shaped fin blades for ships provided by the embodiments of the present application;

[0022] Figure 2 is a structural schematic diagram of the propeller cap turbine with wedge-shaped fin blades for ships from another perspective provided by the embodiments of the present application;

[0023] Figure 3 is a structural schematic diagram of the propeller cap turbine with wedge-shaped fin blades for ships from still another perspective provided by the embodiments of the present application;

[0024] Figure 4 is a structural schematic diagram of the propeller cap turbine with wedge-shaped fin blades for ships from still another perspective provided by the embodiments of the present application;

[0025] Figure 5 is a structural schematic diagram of the propeller cap turbine with wedge-shaped fin blades for ships when installed on the propeller provided by the embodiments of the present application.

[0026] In the drawings:

[0027] 1. Turbine body; 11. Mounting hole; 12. Mounting groove; 2. Wedge-shaped fin; 3. Fixing component; 100. Propeller. Detailed Implementation

[0028] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element.

[0034] The technical solutions of the present application will be further illustrated below in conjunction with the accompanying drawings and specific embodiments.

[0035] The embodiment provides a propeller cap turbine with wedge-shaped fin leaves for a ship, which is installed at the rear of a propeller of a ship, optimizes a design link, improves design efficiency, and reduces installation difficulty, avoids the risk of misalignment and misinstallation, and is convenient to install.

[0036] Exemplarily, as shown in Figures 1-5 The propeller cap turbine with wedge-shaped fin leaves for a ship includes a turbine body 1 and a plurality of wedge-shaped fin leaves 2, the plurality of wedge-shaped fin leaves 2 are uniformly distributed on the outer side of the turbine body 1, the pitch angles of the plurality of wedge-shaped fin leaves 2 are the same, and the pitch angle of the wedge-shaped fin leaves 2 is the same as the average value of the pitch angles of the propeller 100 in the 0.4R-0.9R interval. The wake rotational kinetic energy generated by the propeller 100 in the 0.4R-0.9R interval is relatively strong, and this area contributes a relatively large thrust. When the pitch angle of the wedge-shaped fin leaves 2 is consistent with the average pitch angle in this interval, the circumferential rotation component of the wake can be efficiently offset, the waste vortex kinetic energy can be converted into axial additional thrust, the energy consumption can be reduced, and the operation efficiency of the propeller 100 can be improved. It can be understood that when designing the propeller cap turbine, only the pitch angle of the wedge-shaped fin leaves 2 needs to be the same as the average value of the pitch angles in this interval, that is, the energy consumption can be reduced, the operation efficiency of the propeller 100 can be improved, and the circumferential relative position, trim, skew and other geometric parameters of the wedge-shaped fin leaves 2 and the propeller 100 do not need to be considered, the design link is optimized, and the design efficiency is improved. Moreover, when installing, the circumferential installation angle does not need to be considered, the installation difficulty is reduced, the risk of misalignment and misinstallation is avoided, and the installation is convenient.

[0037] It should be noted that the pitch angle is a key angular parameter describing the local geometric inclination of the blade in the design of the propeller 100 (or similar rotating blades, such as a fan, a rudder blade, and a wedge-shaped fin leaf 2). Specifically, the pitch angle is the angle between the chord of the blade section at that radius and the rotation plane. The 0.4R-0.9R interval of the propeller 100 represents the 0.4R-0.9R radial position range from the rotation center of the propeller 100 to the blade tip, and R is the radius of the propeller 100. Both of them are prior art, and will not be described here.

[0038] Further, as shown in Figure 2 and Figure 5As shown, the turbine body 1 is cylindrical, and one end of the turbine body 1 is an open end in the axial direction of the turbine body 1, and the open end is connected to the hub small end (not shown in the figure) of the propeller 100. It can be understood that by providing the open end on the turbine body 1, the open end is connected to the hub small end of the propeller 100, which facilitates the installation of the turbine body 1. Specifically, the diameter of the turbine body 1 is consistent with the diameter of the hub small end.

[0039] As shown in the example, Figure 1 and Figure 5 The propeller cap turbine with wedge-shaped fin blades for ships also includes a plurality of fixing members 3. The turbine body 1 is provided with a plurality of fixing holes 11 on the outer side near the open end, and the plurality of fixing members 3 and the fixing holes 11 are arranged one-to-one, and the plurality of fixing holes 11 are arranged one-to-one with the plurality of bolt holes of the hub small end, and the fixing member 3 can be located in the corresponding fixing hole 11 and bolt hole. It can be understood that by providing a plurality of fixing members 3 and a plurality of fixing holes 11 corresponding to the plurality of bolt holes, when the propeller cap turbine with wedge-shaped fin blades for ships needs to be installed, the connection between the propeller cap turbine with wedge-shaped fin blades for ships and the propeller 100 can be achieved through the fixing member 3. In this embodiment, the fixing member 3 can be a bolt and a nut, and the fixing hole 11 can be a through hole or other types of holes, and the bolt is arranged in the fixing hole 11 and the bolt hole, and cooperates with the nut to fix the propeller cap turbine with wedge-shaped fin blades for ships and the propeller 100.

[0040] Further, it is further conceivable that the plurality of bolt holes at the hub small end are generally uniformly distributed in the circumferential direction, and by providing a plurality of fixing holes 11, it is convenient to adjust the turbine body 1 in the circumferential position, and facilitate the connection between the turbine body 1 and the hub small end. After the open end is connected to the hub small end during installation, rotating the turbine body 1 can achieve the alignment of the fixing hole 11 and the bolt hole, which facilitates installation.

[0041] Of course, in other embodiments, as shown in the example, Figures 3-4 In the circumferential direction of the turbine body 1, a plurality of fixing holes 11 can be uniformly and spacedly arranged on the turbine body 1, the number of fixing holes 11 is greater than the number of bolt holes of the hub small end, and any fixing member 3 can be selectively located in one of the fixing holes 11 and one of the bolt holes, to achieve the fixation of the propeller cap turbine with wedge-shaped fin blades for ships and the propeller 100. The specific types and quantities of fixing members 3 and fixing holes 11 can be determined according to actual use requirements, and this embodiment will not be described again.

[0042] Further, as shown in the example, Figure 1As shown, the turbine body 1 is further provided with a plurality of fixing grooves 12, which correspond to the plurality of fixing holes 11 one by one, and the fixing hole 11 is arranged in the corresponding fixing groove 12. It can be understood that by arranging the plurality of fixing grooves 12, the fixing hole 11 is arranged in the corresponding fixing groove 12, and when installing, the part of the fixing member 3 protruding from the fixing hole 11 can be accommodated in the fixing groove 12.

[0043] Specifically, the plurality of fixing grooves 12 are distributed along the outer side of the turbine body 1.

[0044] In this embodiment, the diameter of the turbine body 1 is 0.1-0.2 times the diameter of the propeller 100. For example, the diameter of the turbine body 1 is 0.1, 0.15, 0.2 times, etc. of the diameter of the propeller 100.

[0045] In the radial direction of the turbine body 1, the length of the wedge-shaped fin 2 is 0.2-0.4 times the diameter of the turbine body 1. For example, the length of the wedge-shaped fin 2 is 0.2, 0.25, 0.3, 0.35 times, etc. of the diameter of the turbine body 1. In this embodiment, specifically, the length of the wedge-shaped fin 2 is 0.35 times the diameter of the turbine body 1.

[0046] In this embodiment, the wedge-shaped fin 2 is an asymmetric wedge-shaped blade. The length of the turbine body 1 can be determined according to actual use requirements, as long as the wedge-shaped fin 2 can be arranged.

[0047] Further, in the radial direction of the turbine body 1, the thickness of the wedge-shaped fin 2 gradually decreases. It can be understood that this arrangement makes the thickness of the root of the wedge-shaped fin 2, i.e. the position where the wedge-shaped fin 2 contacts the outer side of the turbine body 1, larger, so that the strength of this position is larger, to ensure the connection strength of the wedge-shaped fin 2 and the turbine body 1.

[0048] Further, as shown, Figure 2 In this embodiment, the end of the wedge-shaped fin 2 away from the turbine body 1 is rounded. It can be understood that by rounding the end of the wedge-shaped fin 2 away from the turbine body 1, i.e. the leading edge of the wedge-shaped fin 2, the stress distribution is homogenized, prolonging the service life.

[0049] Further, in the axial direction of the turbine body 1, the length of the wedge-shaped fin 2 is smaller than the length of the turbine body 1, so that the size of the wedge-shaped fin 2 is smaller than that of the traditional fin, and in addition to ensuring the normal elimination of hub vortex capability, to a certain extent, the stability and safety of the wedge-shaped fin 2 moving with the propeller 100 under complex working conditions are ensured, and the risk of fracture and damage is reduced.

[0050] Further, the number of the wedge-shaped fin leaves 2 is 5-10. For example, the number of the wedge-shaped fin leaves 2 can be 5, 6, 7, 8, 9, 10, etc. In the present embodiment, seven wedge-shaped fin leaves 2 are provided on the turbine body 1.

[0051] It should be noted that the above only describes the preferred embodiments of the present application and the principles of the applied technology. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A marine propeller cap turbine with wedge-shaped fins, installed aft of a ship's propeller (100), characterized in that, The marine propeller cap turbine with wedge-shaped fins includes a turbine body (1) and multiple wedge-shaped fins (2). The multiple wedge-shaped fins (2) are evenly distributed on the outer side of the turbine body (1). The multiple wedge-shaped fins (2) have the same pitch angle, and the pitch angle of the wedge-shaped fins (2) is the same as the average pitch angle of the propeller (100) in the range of 0.4R to 0.9R.

2. The marine propeller turbine with wedge-shaped fins according to claim 1, characterized in that, The turbine body (1) is cylindrical, and one end of the turbine body (1) is an open end along the axial direction, and the open end is connected to the small end of the hub of the propeller (100).

3. The marine propeller turbine with wedge-shaped fins according to claim 2, characterized in that, The marine propeller turbine with wedge-shaped fins also includes multiple fasteners (3). Multiple fixing holes (11) are provided at intervals on the outer side of the turbine body (1) near the opening end. The multiple fasteners (3) and the fixing holes (11) are provided one-to-one, and the multiple fixing holes (11) are provided one-to-one with the multiple bolt holes at the small end of the propeller hub. The fasteners (3) can be located in the corresponding fixing holes (11) and bolt holes.

4. The marine propeller turbine with wedge-shaped fins according to claim 3, characterized in that, The turbine body (1) is also provided with a plurality of fixing slots (12), and the plurality of fixing slots (12) correspond one-to-one with the plurality of fixing holes (11), and the fixing holes (11) are provided in the corresponding fixing slots (12).

5. The marine propeller turbine with wedge-shaped fins according to claim 1, characterized in that, The diameter of the turbine body (1) is 0.1 to 0.2 times the diameter of the propeller (100).

6. The marine propeller turbine with wedge-shaped fins according to claim 1, characterized in that, In the radial direction of the turbine body (1), the length of the wedge-shaped fin (2) is 0.2 to 0.4 times the diameter of the turbine body (1).

7. The marine propeller turbine with wedge-shaped fins according to claim 1, characterized in that, The thickness of the wedge-shaped fin (2) gradually decreases in the radial direction of the turbine body (1).

8. The marine propeller turbine with wedge-shaped fins according to claim 1, characterized in that, In the axial direction of the turbine body (1), the length of the wedge-shaped fin (2) is less than the length of the turbine body (1).

9. The marine propeller turbine with wedge-shaped fins according to claim 1, characterized in that, The number of wedge-shaped fins (2) is 5-10.

10. The marine propeller turbine with wedge-shaped fins according to claim 1, characterized in that, The end of the wedge-shaped fin (2) away from the turbine body (1) is rounded.

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