Ship tail rectification pre-rotation energy-saving device

Abstract

The utility model relates to a ship tail rectifying and pre-rotating energy-saving device which comprises fins, a front guide wheel, guide vanes, reinforcing ribs, a ship body, a propeller, a rudder and the like. The fins are mounted at the upper end of the front guide wheel to optimize the water flow direction; the front guide wheel is located in front of the propeller, the water flow direction is adjusted through rotation, and energy loss is reduced. The guide vanes are arranged according to angles, water flow is guided to form pre-rotation, and the inflow state of the propeller is optimized. The reinforcing ribs and the guide wheels are welded and fixed on the ship body to enhance the structural stability. The device is integrally mounted at the tail part of a ship body, is suitable for different types of ships, improves the propelling efficiency, reduces wake flow loss, improves the controllability, and is particularly suitable for container ships, bulk cargo ships, fire-fighting ships and engineering ships of 1000 tons or above.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy -conserving device of ship propulsion field. BACKGROUND

[0002] The ship propulsion system is one of the important components of modern warships, which is usually composed of main engine, transmission device and propeller. Since the propeller directly acts on water, it has an important influence on the performance of the whole propulsion system. At present, in order to improve the thrust and speed of the propeller, many ships use high-speed large-diameter propellers. However, this design scheme will cause the propeller to produce larger resistance and noise, and also increase fuel consumption.

[0003] In view of the above problems, domestic and foreign scholars have carried out a lot of research work. Among them, some scholars put forward a new propulsion scheme - "pre-rotation", that is, a set of guide vanes or guide wheels and other devices are arranged in front of the propeller to turn the water flow to the optimal incident angle position of the propeller in advance. In this way, the load of the propeller can be effectively reduced, thereby improving the propulsion efficiency. In addition, the cavitation phenomenon generated by the propeller can be reduced, thereby improving the noise level. This method has been applied in many military and civilian ships. However, it is found in actual use that the traditional pre-rotation device has the following shortcomings:

[0004] (1) Complex structure and large volume;

[0005] (2) High manufacturing cost;

[0006] (3) Difficult to achieve precise control;

[0007] (4) Prone to failure;

[0008] (5) Cannot meet the needs of various working conditions.

[0009] Therefore, it is necessary to develop a new type of pre-rotation device to solve these problems. SUMMARY

[0010] Therefore, the utility model provides a kind of ship tail flow regulation pre-rotation energy-saving device, to solve the above problems in prior art.

[0011] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0012] A kind of ship tail flow regulation pre-rotation energy-saving device, comprising:

[0013] Fin, one on each side, is installed at the uppermost end of the front guide wheel, for optimizing the direction of water flow, improving the propulsion efficiency of the propeller;

[0014] Pre-swirl stator, installed in front of the propeller, adjusts the flow direction by rotation, reducing energy loss;

[0015] Guide vanes, arranged on the pre-swirl stator at a certain angle, guide the water flow to form pre-swirl, optimizing the inflow state of the propeller;

[0016] Stiffeners, used to connect the pre-swirl stator and the hull, are fixed by welding to enhance structural strength and stability;

[0017] Hull, as the basic structure supporting the flow regulation and pre-swirl energy-saving device;

[0018] Propeller, used for ship propulsion, cooperates with the energy-saving device to improve propulsion efficiency;

[0019] Rudder, located behind the propeller, cooperates with the energy-saving device to optimize maneuverability and reduce energy loss.

[0020] Further, the fin length is 0.8-2.5 m, the height is 0.3-1.2 m, the fin leading edge installation angle is 5°-15°, and the installation offset relative to the propeller axis is 0.2-0.8 m, to optimize the flow regulation effect.

[0021] Further, the stiffeners are made of high-strength materials and are fixed on the hull by welding to ensure long-term stability of the device.

[0022] Further, the pre-swirl stator has an outer diameter of 0.5-1.5 m, and 3-7 guide vanes are arranged thereon, with a guide vane spacing of 10-20 cm and a guide vane angle of 10°-25°, for guiding the water flow and optimizing the flow field in front of the propeller.

[0023] Further, the device is installed on the hull at the tail, with an installation height of 1.0-3.5 m above the waterline and a total length of 2.0-5.0 m, to adapt to different types of ship propulsion systems.

[0024] Further, for catamaran structures, the installation span between the left and right hulls is 2.0-6.0 m, ensuring balanced influence of the fin on the incoming flow and optimizing propulsion efficiency.

[0025] Further, the device is compatible with different specifications of propellers and can improve energy-saving effect and propulsion performance by optimizing the design of fins and guide vanes.

[0026] Further, the combination design of the fin, pre-swirl stator and guide vanes can improve the efficiency of the propeller and reduce energy loss behind the rudder.

[0027] Further, the rudder is designed to cooperate with the device to reduce rolling of the ship at high speed and improve maneuvering performance.

[0028] Further, the device can be applied to 1000-ton and above container ships, bulk carriers, fire fighting ships or engineering ships, significantly reducing propeller wake loss and improving fuel economy.

[0029] The ship stern flow regulation and pre-rotation energy-saving device has the following beneficial effects:

[0030] 1. The ship stern flow regulation and pre-rotation energy-saving device can effectively reduce energy loss and improve the propelling efficiency of the propeller.

[0031] 2. The device has a simple and compact structure, is easy to install and maintain, and reduces production costs.

[0032] 3. The device is suitable for the propulsion system of various types of ships and can be adjusted and optimized as needed.

[0033] 4. The device can significantly improve the maneuverability and comfort of the ship. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 is a front view of one of the embodiments of the stern energy-saving device provided by the utility model;

[0035] Fig. 2 is a fin profile provided by the utility model;

[0036] Fig. 3 is a left view of the flow regulation and pre-rotation energy-saving device provided by the utility model.

[0037] (Abbreviation: 01-fin, 02-lead guide wheel, 03-vane, 04-stiffener, 05-hull, 06-propeller, 07-rudder) DETAILED DESCRIPTION

[0038] Referring to Figs. 1-3As shown, the ship tail flow regulation pre-rotation energy-saving device mainly comprises fin 01, front guide wheel 02, guide vane 03, reinforcing rib 04, ship body 05, propeller 06 and rudder 07 and the like. The fin 01 is installed at the uppermost end of the front guide wheel 02, and is used for optimizing the water flow direction and improving the propelling efficiency of the propeller 06; the front guide wheel 02 is arranged in front of the propeller 06 at the tail of the ship, and the water flow direction is adjusted through rotation to reduce energy loss; the guide vane 03 is arranged on the front guide wheel 02 and is arranged at a certain angle to guide the water flow to form pre-rotation and optimize the inflow state of the propeller 06; the reinforcing rib 04 is used for connecting the front guide wheel 02 and the ship body 05 and is fixed by welding to enhance the structural strength and stability; the ship body 05 is used as a basic structure for supporting the flow regulation pre-rotation energy-saving device; the propeller 06 is used for ship propulsion and cooperates with the energy-saving device to improve the propelling efficiency; and the rudder 07 is located behind the propeller 06 and cooperates with the energy-saving device to optimize the maneuverability and reduce energy loss.

[0039] In the specific implementation process, the fin 01 is generally triangular, the length (L) is 0.8-2.5 m, the height (h) is 0.3-1.2 m, the fin leading edge installation angle (a) is 5°-15°, and the installation offset (a1) relative to the propeller axis is 0.2-0.8 m, so as to optimize the water flow regulation effect. The height of the fin 01 can be adjusted according to the ship width, and generally does not exceed half of the ship width.

[0040] The front guide wheel 02 adopts a cylindrical structure, and the outer diameter is 0.5-1.5 m. The front guide wheel 02 is provided with 3-7 guide vanes 03, the guide vane spacing is 10-20 cm, and the guide vane angle is 10°-25°, which is used for guiding the water flow and optimizing the flow field in front of the propeller. In order to ensure the structural strength and stability, the reinforcing rib 04 is made of high-strength material and is fixed on the ship body 05 by welding with the guide wheel.

[0041] The overall installation height of the device is 1.0-3.5 m from the waterline, and the overall length is 2.0-5.0 m, so as to adapt to the propulsion systems of different types of ships. For the catamaran structure, the installation span (B) between the left and right ship bodies 05 is 2.0-6.0 m, so as to ensure the balanced influence of the fin 01 on the incoming flow and optimize the propelling efficiency.

[0042] The device can be compatible with different specifications of propellers 06, and the energy-saving effect and propelling performance can be improved by optimizing the design of the fin 01 and the guide vane 03. In addition, the combination design of the fin 01, the front guide wheel 02 and the guide vane 03 can improve the efficiency of the propeller 06 and reduce the energy loss of the rear part of the rudder 07. The cooperation design of the rudder 07 and the device can reduce the rolling of the ship at high speed and improve the maneuvering performance.

[0043] The device can be applied to 1000-ton and above container ships, bulk carriers, fire fighting ships or engineering ships through experiment verification, and can significantly reduce the propeller wake loss and improve the fuel economy.

[0044] The above examples are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent change or modification according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A ship stern rectification and pre-swirl energy-saving device, characterized in that, include: Fins (01), one on each side, are installed at the top of the front guide wheel (02) to optimize the direction of water flow and improve the propulsion efficiency of the propeller (06); The front guide wheel (02) is located in front of the propeller (06) at the stern of the ship. It adjusts the direction of water flow by rotating to reduce energy loss. Guide vanes (03) are mounted on the front guide wheel (02) and arranged at a certain angle to guide the water flow to form a pre-swirl and optimize the inflow state of the propeller (06); The reinforcing rib (04) connects the front guide wheel (02) and the hull (05) and is fixed by welding to enhance the structural strength and stability; The hull (05) serves as the basic structure supporting the rectifier pre-swirl energy-saving device; Propeller (06), used for ship propulsion, in conjunction with this energy-saving device to improve propulsion efficiency; The rudder (07), located behind the propeller (06), works in conjunction with energy-saving devices to optimize maneuverability and reduce energy loss.

2. The stern-end rectification and pre-swirl energy-saving device according to claim 1, characterized in that: The fin (01) has a length (L) of 0.8–2.5 m, a height (h) of 0.3–1.2 m, a leading edge mounting angle (a) of 5°–15°, and an installation offset (a1) of 0.2–0.8 m relative to the propeller axis to optimize the water flow rectification effect.

3. The stern-end rectification and pre-swirl energy-saving device as described in claim 1, characterized in that, The reinforcing rib (04) is made of high-strength material and is fixed to the hull (05) by welding to ensure the long-term stability of the device.

4. The stern-end rectification and pre-swirl energy-saving device according to claim 1 or 2, characterized in that: The front guide wheel (02) has an outer diameter of 0.5–1.5 m and is equipped with 3–7 guide vanes (03) with a guide vane spacing of 10–20 cm and a guide vane angle of 10°–25°, which are used to guide the water flow and optimize the flow field in front of the propeller.

5. The stern-end rectification and pre-swirl energy-saving device according to claim 1, 2, 3 or 4, characterized in that: The device is installed as a whole at the stern of the hull (05), with an installation height of 1.0–3.5 m above the waterline and an overall length of 2.0–5.0 m, to accommodate the propulsion systems of different types of ships.

6. The stern-end rectification and pre-swirl energy-saving device according to claim 1, 2, 3 or 4, characterized in that: For catamaran structures, the installation span (B) between the left and right hulls (05) is 2.0–6.0 m to ensure the balanced influence of the fins (01) on the incoming flow and optimize propulsion efficiency.

7. The stern-end rectification and pre-swirl energy-saving device as described in claim 1, characterized in that, The device is compatible with propellers (06) of different specifications and can improve energy efficiency and propulsion performance by optimizing the design of fins (01) and guide vanes (03).

8. The stern-end rectification and pre-swirl energy-saving device as described in claim 1, characterized in that, The combined design of the fins (01), the front guide wheel (02) and the guide vanes (03) can improve the efficiency of the propeller (06) and reduce the energy loss at the rear of the rudder (07).

9. The stern-end rectification and pre-swirl energy-saving device as described in claim 1, characterized in that, The rudder (07) is designed in conjunction with this device to reduce rolling and improve maneuverability when the ship is sailing at high speed.

10. The stern-end rectification and pre-swirl energy-saving device for ships according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that: This device is applicable to container ships, bulk carriers, fireboats, or engineering vessels of 1,000 tons and above, significantly reducing propeller wake loss and improving fuel economy.

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