Downward-convex shuttle-shaped double-tail-fin ship-shaped line structure

Abstract

A lower convex shuttle-shaped double-tail-fin ship-shaped line structure comprises a ship body, shuttle-shaped double tail fins are arranged at the bottom of the ship body, the shuttle-shaped double tail fins protrude downwards to form the lower convex shuttle-shaped double tail fins, and contour lines of the lower convex shuttle-shaped double tail fins comprise a double-tail-fin-shaped line bottom line, inner and outer bevel lines and a tail end round line. The double-tail-fin molded line bottom line and the inner and outer bevel line are arc-shaped smooth curves, the tail end round line is a straight line section, and the inner and outer bevel line is a line for connecting the lower convex shuttle-shaped double tail fins and the main hull; the upward view contour line of the lower convex shuttle-shaped double-tail fin is in a shuttle shape with two sharp and long ends; the maximum width A of the lower convex shuttle-shaped double tail fins is 1.2-1.5 times of the width of the gearbox, and the maximum height B of the lower convex shuttle-shaped double tail fins is 1.2-1.5 times of the height of the outer contour below the center line of the output shaft of the gearbox. The utility model is suitable for ships with smaller ship draft depth and larger main engine power and ship types provided with large-diameter propellers, the installation position of the main engine is lowered, so that the main engine operates stably, and a larger space can be vacated in an engine room.

Description

Technical Field

[0001] The utility model relates to the technical field of ships, in particular to a downwardly convex spindle-shaped double-fin ship hull line structure. Background Art

[0002] In recent years, especially at the present stage, the development of domestic inland river ship hulls has been very rapid and diverse. The stern hull lines include double tails, double bulbous tails, double skew tails, vortex tails, spindle-shaped double fins, asymmetric bulbous tails, double fins, etc.; the bow hull lines include pointed bows, bulbous bows, vertical bows, U-shaped bows, V-shaped bows, flat bows, fat bows with large block coefficients, etc. These ship hull lines have their own advantages and disadvantages. Double-hull ships are widely used in ships with relatively small deadweights such as passenger ships and official ships. However, due to the special structure of the double-hull ship formed by the combination of two hulls, the two hulls are separated, and the engine room gearbox, main engine, and supporting machinery and electrical equipment are distributed in their respective two hulls, which are far apart from each other. The cabin layout is difficult, management and operation are inconvenient, the engine room space is limited, and the construction cost is high.

[0003] Existing ships, especially small official ships, generally have a relatively small molded depth, but require a relatively high speed, a relatively large main engine power matching, a relatively large optimal diameter of the propeller. In conventional designs, the propeller shafting is inclined and the main engine is also installed at an inclination angle to meet the requirement of installing a relatively large propeller, which is not conducive to the running stability of the main engine, increases vibration and noise, and is a pain point that is difficult to solve for this type of small ship with a relatively small molded depth. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a downwardly convex spindle-shaped double-fin ship hull line structure, which is applicable to ships with a relatively small draft and a relatively large main engine power and has a hull type for installing a large-diameter propeller, reduces the installation position of the main engine to make it run smoothly, and can also create a relatively large space in the engine room.

[0005] To achieve the above purpose, the utility model provides a downwardly convex spindle-shaped double-fin ship hull line structure, including a hull. A spindle-shaped double fin is provided at the bottom of the hull. The spindle-shaped double fin bulges downward to form a downwardly convex spindle-shaped double fin. The downwardly convex spindle-shaped double fin includes a tail section, a middle section, and a front section that are smoothly connected. The contour line of the downwardly convex spindle-shaped double fin includes a bottom line of the double-fin hull line, an inner and outer fold line, and a tail end-round line. Both the bottom line of the double-fin hull line and the inner and outer fold line are arc-shaped smooth curves. The tail end-round line is a straight line segment. The inner and outer fold line is the line connecting the downwardly convex spindle-shaped double fin and the main hull; the tail end-round line is located at the tail of the downwardly convex spindle-shaped double fin. The upward view contour line of the downwardly convex spindle-shaped double fin is a spindle shape with pointed ends at both ends; the maximum width A of the downwardly convex spindle-shaped double fin is equal to 1.2 - 1.5 times the width of the gearbox, and the maximum height B of the downwardly convex spindle-shaped double fin is equal to 1.2 - 1.5 times the height of the outer contour below the center line of the output shaft of the gearbox.

[0006] The lower convex fusiform double tail fins include a tail section, a middle section, and a front section that are smoothly and transitionally connected. The length D of the middle section of the lower convex fusiform double tail fins is 1.2 to 1.5 times the sum of the length of the gearbox and the length of the main engine.

[0007] The horizontal line tangent to the lowest end of the bottom line of the double tail fin profile is the bottom baseline of the lower convex fusiform double tail fin profile. The space between the bottom baseline of the lower convex fusiform double tail fin profile and the main hull baseline is the lower convex fusiform double tail fins. The shaft center line of the propeller is not higher than the main hull baseline.

[0008] The end face of the tail end of the lower convex fusiform double tail fins is circular, and the diameter of the end face at the tail end is equal to the diameter of the tail pipe of the output shaft of the gearbox.

[0009] The distance C between the main hull baseline and the bottom of the hull at the tail of the ship is equal to half of the diameter of the propeller plus the clearance between the propeller and the ship bottom plate.

[0010] The gearbox and the main engine connected to the gearbox are installed by sinking into the abdominal cavity of the lower convex fusiform double tail fins.

[0011] Compared with the prior art, the present utility model has the following technical effects:

[0012] The present lower convex fusiform double tail fins protrude below the main hull, forming a semi-body abdominal cavity that can accommodate the gearbox and the main engine below the shaft center line. And it has the following advantages: First, a large-diameter propeller can be used, and the large-diameter propeller can improve the propulsion efficiency; Second, it reduces the center of gravity of the ship and improves the stability margin. Third, due to the lowering of the shaft center line, a small part of the gearbox and the main engine is located below the main hull, increasing the upper space of the gearbox and the main engine, which is beneficial to the layout of the engine room equipment. Fourth, it has a good hull line shape, has good rapidity, and has a remarkable energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0014] Figure 1 It is a longitudinal sectional view of the ship type with the lower convex double tail fin profile of the present utility model.

[0015] Figure 2 It is a waterplane view of the ship type with the lower convex double tail fin profile of the present utility model.

[0016] Figure 3 It is a transverse sectional view of the ship type with the lower convex double tail fin profile of the present utility model.

[0017] Figure 4 It is a longitudinal sectional contour view of the lower convex double tail fins of the present utility model.

[0018] Figure 5This is the contour line diagram of the shafting center line of the main hull with a downwardly convex double tail fin of the present utility model.

[0019] Figure 6 This is the cross-sectional contour line diagram of the downwardly convex double tail fin of the present utility model.

[0020] Figure 7 This is the longitudinal installation schematic diagram of the propeller, gearbox, and main engine of the present utility model.

[0021] Figure 8 This is the in-plane layout schematic diagram of the gearbox and main engine compartment of the present utility model.

[0022] Figure 9 This is the connection structure schematic diagram of the full solid floor in the abdominal cavity of the downwardly convex double tail fin and the marine tail shaft and tail pipe device of the present utility model.

[0023] Figure 10 This is the structure schematic diagram of installing a rudder blade on the hull form of the downwardly convex double tail fin of the present utility model.

[0024] In the figure: WL represents the water line, CL represents the water line, and the number after CL represents the distance from the center line.

[0025] Hull 100, main engine 101, gearbox 102, propeller 103, rudder blade 104, bottom of the hull tail 105, shafting center line 106, marine tail shaft and tail pipe device 107;

[0026] Downwardly convex fusiform double tail fin 110, bottom line of the double tail fin form 111, inner and outer fold lines 112, end round line at the tail 113. Detailed implementation manners

[0027] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.

[0028] Please refer to Figure 1-8, A downwardly convex spindle-shaped double-tail fin hull line structure, including a hull 100, with a spindle-shaped double-tail fin provided at the bottom of the hull 100. The spindle-shaped double-tail fin bulges downward to form a downwardly convex spindle-shaped double-tail fin 110. The downwardly convex spindle-shaped double-tail fin 110 includes a tail section, a middle section, and a front section that are smoothly transitionally connected. The contour line of the downwardly convex spindle-shaped double-tail fin 110 includes a double-tail fin line bottom line 111, an inner and outer fold line 112, and a tail end round line 113. Both the double-tail fin line bottom line 111 and the inner and outer fold line 112 are arc-shaped fair curves, and the tail end round line 113 is a straight line segment. The inner and outer fold line 112 is the line connecting the downwardly convex spindle-shaped double-tail fin 110 to the main hull. The tail end round line 113 is located at the tail of the downwardly convex spindle-shaped double-tail fin 110. The upward view contour line of the downwardly convex spindle-shaped double-tail fin 110 is a spindle shape with pointed ends. The maximum width A of the downwardly convex spindle-shaped double-tail fin 110 is equal to 1.2 to 1.5 times the width of the gearbox 102, and the maximum height B of the downwardly convex spindle-shaped double-tail fin 110 is equal to 1.2 to 1.5 times the height of the outer contour below the center line of the output shaft of the gearbox 102. By providing the downwardly convex spindle-shaped double-tail fin 110 at the bottom of the hull 100, the engine room has a larger space. A larger power main engine can be installed inside the downwardly convex spindle-shaped double-tail fin 110, and a larger diameter propeller can also be installed. At the same time, the installation position of the main engine can be lowered, enabling the main engine to be stably installed and improving the stability of the main engine operation.

[0029] Specifically, the downwardly convex spindle-shaped double-tail fin 110 protrudes below the main hull. The cross-sectional area of the downwardly convex spindle-shaped double-tail fin gradually decreases from the middle to both ends. The front length of the downwardly convex spindle-shaped double-tail fin forms a fair streamline shape according to the middle section width, the tail pipe outlet diameter, and the front inlet flow section.

[0030] See Figure 7 , The downwardly convex spindle-shaped double-tail fin 110 includes a tail section, a middle section, and a front section that are smoothly transitionally connected. The middle section length D of the downwardly convex spindle-shaped double-tail fin 110 is 1.2 to 1.5 times the sum of the length of the gearbox 102 and the length of the main engine 101.

[0031] See Figure 7 , The horizontal line tangent to the lowest end of the double-tail fin line bottom line 111 is the bottom baseline of the downwardly convex spindle-shaped double-tail fin line. The height between the bottom baseline of the downwardly convex spindle-shaped double-tail fin line and the main hull baseline is the downwardly convex spindle-shaped double-tail fin 110. The shaft center line 106 of the propeller 103 is not higher than the main hull baseline, reducing the ship's center of gravity and increasing the stability margin.

[0032] Specifically, the end face of the tail of the downwardly convex spindle-shaped double-tail fin 110 is circular, and the diameter of the end face is equal to the diameter of the tail pipe of the output shaft of the gearbox 102. The end face of the tail of the downwardly convex spindle-shaped double-tail fin 110 is the plane where the tail end round line 113 is located.

[0033] The distance from the end face of the lower convex spindle-shaped double tail fin 110 to the stern of the ship = the leading edge of the rudder blade 104 + the gap between the propeller and the leading edge of the rudder blade 104 + the length of the propeller + the length of the sealing device + the length of the tail pipe extension + the length determined by a suitable gap. The end face diagram of the lower convex spindle-shaped double tail fin forms an inclined and slender cylindrical shape forward and upward. The cross-sectional line type of the overall lower convex spindle-shaped double tail fin forms a water droplet shape. The waterline surface is spindle-shaped and streamlined, and the longitudinal section line is a slender and drooping arc-shaped streamline. The head section is a slender spindle-shaped streamline, and the end of the tail section inclines upward, so that the tail section and the end face are circularly transitioned into a smooth water droplet shape. In this way, the width of the overall lower convex spindle-shaped double tail fin is only 1.2 to 1.5 times the width of the gearbox, and a lower convex single-body line type can be formed that allows the oncoming flow of the propeller to be smooth and has very little viscous pressure resistance. The connection with the main hull is smoothly connected by left and right fold lines.

[0034] See Figure 7 , the distance C between the baseline of the main hull and the bottom 105 of the hull tail is equal to 1 / 2 of the diameter of the propeller 103 plus the gap between the propeller 103 and the bottom plate of the ship. The lower convex spindle-shaped double tail fin 110 reduces the height of the shafting center line 106, and the bottom of the hull tail only rises slightly. With the shafting center line 106 as the center, a propeller 103 with a larger diameter can be used.

[0035] Specifically, the gearbox 102 and the main engine 101 connected to the gearbox 102 are installed and sunk into the abdominal cavity of the lower convex spindle-shaped double tail fin 110 to reduce the center of gravity of the ship and facilitate increasing the stability margin of the ship.

[0036] For the existing spindle-shaped double tail fin ship type, the gearbox and the main engine are all located above the bottom baseline of the lower convex spindle-shaped double tail fin line type. The lower convex of the lower convex spindle-shaped double tail fin of this ship type makes the lower half of the gearbox and the main engine located in the abdominal cavity of the lower convex spindle-shaped double tail fin.

[0037] The lower convex spindle-shaped abdominal cavity realizes the horizontal arrangement of the shafting center line and provides sufficient height space. The horizontally arranged shafting center line of the ship makes the operation of the gearbox and the main engine stable, reduces vibration and noise, and improves the comfort of the ship.

[0038] The head end of the lower convex spindle-shaped double tail fin is a sharp and smooth spindle shape. When the ship moves forward, the water flow passes through the smooth spindle-shaped streamline hull, increasing the flow velocity and reducing the resistance, so as to achieve sufficient water supply for the propeller and improve the propulsion efficiency of the propeller.

[0039] See Figure 9, the abdominal cavity of the downwardly convex spindle-shaped double tail fin protrudes below the main hull, which is conducive to arranging solid floors at each frame space during the hull design. Further, the fully arranged solid floors provide installation conditions for installing the marine stern shaft and stern tube device 107 disclosed in CN106741799B of the company. The structure of firmly welding the floors in the abdominal cavity of the downwardly convex spindle-shaped double tail fin around the outer stern tube of the marine stern shaft and stern tube device 107 enables the application of the marine stern shaft and stern tube device 107 on small boats. Currently, this installation method has been tested on actual ships in small batches, achieving the effects of higher alignment accuracy of the shafting and smoother operation of the shafting compared with the conventional stern shaft and stern tube installation method.

[0040] See Figure 10 , the downwardly convex structural shape of the downwardly convex spindle-shaped double tail fin. The downwardly convex shape structure is placed in front of the rudder, providing an outer shape protection structure for designing a rudder blade 104 with a large aspect ratio. That is, the lowest end of the rudder blade 104 is located slightly above and behind the downwardly convex double tail fin, and the rudder blade will not be damaged when the ship encounters contact and grounding, which can play a safety protection role for the rudder blade.

[0041] The application of the downwardly convex spindle-shaped double tail fin enables the application of a rudder blade with a large aspect ratio on small boats. The steering efficiency of this rudder is increased by 3% at small rudder angles and 6% at large rudder angles. When the rudder angle is large, the resistance of the rudder can be reduced by 20%, realizing the application of another energy-saving technology on small ships. The rudder blade 104 adopts a high-performance combined rudder structure disclosed in CN114802676B.

[0042] The hull line structure of the downwardly convex spindle-shaped double tail fin is also applicable to various large ships under the water depth conditions allowing draft.

[0043] The hull line structure of the downwardly convex spindle-shaped double tail fin is also applicable to ships propelled by electric or other clean energy power systems.

[0044] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations to the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A downward convex fusiform double tail fin ship line structure, comprising a hull (100), wherein the bottom of the hull (100) is provided with a fusiform double tail fin, characterized in that: The fusiform double tail fins bulge downward to form downward convex fusiform double tail fins (110). The contour lines of the downward convex fusiform double tail fins (110) include the bottom line of the double tail fin type line (111), inner and outer corner lines (112) and the tail end round line (113). The bottom line of the double tail fin type line (111) and the inner and outer corner lines (112) are both arc-shaped smooth curves. The tail end round line (113) is a straight line segment. The inner and outer corner lines (112) are the connection between the downward convex fusiform double tail fins (110) and the main The hull is connected by a tail end circle line (113) located at the tail of the downward convex fusiform double tail fin (110), and the downward convex fusiform double tail fin (110) has a tail shape with two pointed ends when viewed from above; the maximum width A of the downward convex fusiform double tail fin (110) is equal to 1.2 to 1.5 times the width of the gear box (102), and the maximum height B of the downward convex fusiform double tail fin (110) is equal to 1.2 to 1.5 times the height of the outer contour below the center line of the output shaft of the gear box (102).

2. The downward convex fusiform double tail fin ship line structure according to claim 1, wherein the downward convex fusiform double tail fin (110) comprises a tail section, a middle section and a front section which are smoothly transitionally connected, and a length D of the middle section of the downward convex fusiform double tail fin (110) is 1.2 to 1.5 times the sum of a length of the gearbox (102) and a length of the main engine (101).

3. According to the downward convex fusiform double tail fin ship line structure of claim 1, the horizontal line tangent to the lowest end of the double tail fin line bottom line (111) is the downward convex fusiform double tail fin line bottom baseline, the downward convex fusiform double tail fin (110) is between the downward convex fusiform double tail fin line bottom baseline and the main hull baseline, and the shaft centerline (106) of the propeller (103) is not higher than the main hull baseline.

4. The downward convex fusiform double tail fin ship line structure according to claim 1, wherein the tail end surface of the downward convex fusiform double tail fin (110) is circular, and the diameter of the tail end surface is equal to the diameter of the tail tube of the output shaft of the gear box (102).

5. According to the downward convex fusiform double-tail fin ship line structure of claim 1, the spacing C between the main hull baseline and the stern bottom (105) of the hull is equal to 1 / 2 of the diameter of the propeller (103) plus the gap between the propeller (103) and the bottom plate.

6. The downward convex fusiform double tail fin ship line structure according to claim 1, wherein the gear box (102) and the main engine (101) connected to the gear box (102) are sunk and installed in the belly cavity of the downward convex fusiform double tail fin (110).

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