KR101302035B1 - A ship - Google Patents

Abstract

The vessel is started. Ship according to the invention, the propeller coupled to the hull to generate a propulsion force; And a hub vortex power generation unit coupled to the propeller and generating electrical energy based on rotational energy caused by a hub vortex generated when the propeller is rotated.

Description

Ship {A ship}

The present invention relates to a ship, and more particularly, to a ship capable of recovering energy of a hub vortex generated when the propeller rotates.

In general, the ship will operate using the propulsion force generated while the propeller rotates. When the propeller rotates, due to the difference in pressure before and after, it pushes the seawater around the propeller, thereby generating the thrust required for propulsion of the ship.

When the propeller rotates, the cross section of the propeller blade has an angle of attack. At this time, lift and drag are generated by the pressure difference generated before and after the blade.

Since the force of the lift and drag of the cross section of the propeller blade acts as the thrust and torque of the propeller, the shape of the cross section of the propeller blade and the hydrodynamic characteristics thereof act as a major factor related to the propulsion efficiency of the propeller blade. Therefore, various forms of research have been steadily made to improve propulsion efficiency of propellers.

In those studies, there are studies to improve propeller propulsion efficiency by minimizing the influence of the propeller wake. Briefly, the wakes generally induced by propellers can be divided into rotary flows induced by propeller blades and hub vortex induced by hubs of propellers. Vortex is known to be 2-3% of the energy supplied to the propeller. There are studies to improve propeller propulsion efficiency by reducing the influence of the hub vortex.

Examples include propeller boss cap with fins (PBCF) or rudder bulbs on rudders to reduce vortices at the tip of the propeller hub. This has been proposed.

Referring to FIG. 1, the propeller boss cap pins 30 (PBCF, Propeller Boss Cap with Fin) are attached to the boss of the ship propeller with the same number of small pins as the number of wings of the propeller 20, and integrally with the propeller 20. And rotate, but rectify the flow near the boss of the propeller 20 to dissipate the hub vortex.

In a typical propeller, the water near the boss of the propeller 20 (for example, 3 mm) moves in the same direction as the rotation in the rotation, whereas the water moves in the opposite direction at a slight distance (for example, 10 mm). The main reason for the hub vortex is the flow in which they collide with each other.

However, when the propeller boss cap pin (30, PBCF, Propeller Boss Cap with Fin) is mounted, as the propeller boss cap pin 30 rotates with the propeller 20, the water flows between the pins of the propeller boss cap pin 30 (30). Rectified to move, and near the center (for example, both 3 mm and 10 mm), all the water moves in the same direction, so that the turbulence accompanying the hub vortex disappears. The reduction in turbulence reduces the resistance of the propeller pins and increases the propulsion. In this way, the ship can sail at the same speed with less fuel.

On the other hand, energy consumption is emerging as the biggest issue due to the recent surge in oil prices, and the demand for fuel-saving vessels is rapidly increasing in the shipbuilding industry. Therefore, there is an urgent need for the development of a vessel equipped with a power generation apparatus using a natural force that can save energy and further reduce atmospheric and marine pollution.

However, in the case of the propeller boss cap with fin (PBCF) or the rudder bulb described above, the propulsion efficiency of the propeller can be improved by reducing the influence of the hub vortex. Energy is not being actively recovered, which requires more advanced technology.

Korean Patent Registration Publication No. 10-008744 (ship propulsion device) 1995.07.31

Therefore, the technical problem to be achieved by the present invention is to provide a vessel capable of actively recovering the hub vortex energy as well as improving the propulsion efficiency by reducing the influence of the hub vortex than conventional.

According to an aspect of the invention, the propeller coupled to the hull to generate a propulsion force; And a hub vortex power generation unit coupled to the propeller, the hub vortex generating unit generating electrical energy based on rotational energy caused by a hub vortex generated when the propeller is rotated.

The propeller may include a propeller blade; And a rotating shaft connected to a central area of the propeller blade to form a rotation axis of the propeller blade, wherein the hub vortex power generation unit may be coupled to a hub forming a rear end of the rotating shaft.

The hub vortex power generation unit may include: a generator blade coupled to a generator shaft disposed to be rotatable relative to the hub and disposed outside the hub to be rotated by a hub vortex generated when the rotation shaft is rotated; And a generator coupled to the generator shaft to be rotatable relative to the inside of the hub to rotate together with the hub to generate electrical energy based on rotational energy according to a difference in relative rotational speed between the hub and the generator blade. can do.

The generator may further include a speed increaser for increasing a rotation speed input to the generator.

The diameter of the generator blade may be equal to the diameter of the hub or smaller than the diameter of the hub.

It may further include a waterjet injection unit coupled to the propeller to spray water in the direction of propeller blade tip vortex to reduce the propeller blade tip vortex cavitation generated when the propeller blade rotates. .

The water jet injection unit, the water injection unit for spraying water provided on the propeller blades; A water supply unit which is operated by receiving electrical energy produced by the hub vortex power generation unit and supplies water toward the water spray unit; And a connection pipe connecting the water supply unit and the water injection unit.

The water spray unit may be a plurality of water spray holes formed in the end region of the wings forming the propeller blade.

The connection pipe, the main pipe is provided in the rotary shaft and connected to the water supply; And at least one branch pipe provided in the propeller blade and branched from the main pipe in the central region of the propeller blade to be connected to the water spray unit.

The water supply unit may include a pump for supplying water to the water injection unit by applying pressure to the water.

The water supply unit, the opening and closing hole in the hub outer surface; And a supply pipe connecting the hole and the water supply unit, and water may be supplied through the hole.

The water supply unit may include an injection tank for connecting the water tank and the water supply unit inside the hull, and may receive water from the water tank.

Embodiments of the present invention can reduce the impact caused by the hub vortex than conventional to improve propulsion efficiency as well as actively recover the hub vortex energy.

1 is a schematic perspective view of a propeller blade equipped with a propeller blade boss cap (PBCF) of a ship according to one embodiment of the prior art.
2 is a schematic side structure diagram of a ship according to a first embodiment of the present invention.
3 is a view schematically showing a state in which the propeller and the hub vortex power generation unit of the ship of FIG. 2 are coupled.
4 is a view schematically illustrating a state in which a propeller, a hub vortex power generation unit, and a waterjet injection unit of a ship according to a second embodiment of the present invention are combined.
5 is a view illustrating a water spray unit of the waterjet injection unit of FIG.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

Figure 2 is a schematic side structure diagram of a ship according to a first embodiment of the present invention, Figure 3 is a view schematically showing a state in which the propeller and hub vortex power generation unit of the ship of Figure 2 coupled. As shown in these drawings, the ship according to the first embodiment of the present invention, the hull 10, the propeller 100 coupled to the hull 10 to generate a propulsion force, and is coupled to the propeller 100 Hub vortex power generation unit 110 for generating electrical energy based on the rotational energy generated by the hub vortex (hub vortex) generated when the propeller 100 is rotated, and the propeller 100 is disposed around the direction of the ship A rudder 200 to adjust.

The ship according to the first embodiment of the present invention may be any of ships, warships, fishing vessels, carriers, drillships and special work vessels, and may include floating offshore structures.

Meanwhile, a thruster 12 may be provided at one side of the hull 10. Although not all types of ships are provided with thrusters 12, the provision of thrusters 12 enhances the coordination performance at the time of stopping or sailing the ship and facilitates the operation of the ship. As shown in FIG. 2, the thruster 12 provided on one side of the hull 10, in particular, the bow 13 is also referred to as a bow thruster.

On the other hand, the propeller 100 is attached to the end of the propulsion shaft system (not shown) connected in the main engine, when the propeller blade 101 of the propeller 100 rotates in the water to push the water and obtain a driving force by the reaction.

In this embodiment, the propeller 100 includes a propeller blade 101 and a rotating shaft 102 connected to the central region of the propeller blade 101 to form a center of rotation of the propeller blade 101.

The propeller blades 101 generate the thrust needed to propel the ship. That is, when the propeller blade 101 rotates, the thrust required to propel the vessel is generated by pushing the seawater around the propeller blade 101 due to the difference in pressure before and after the propeller blade 101.

The rotary shaft 102 is a rotating shaft of the propeller blade 101 connected to the engine (not shown) inside the hull 10 to transmit the rotational force to the propeller blade 101. In the rotary shaft 102 of FIG. 3, the region forming the rear end is referred to as a hub 103. In this case, the area where the propeller blade 101 is coupled and the hub 103 forming the rear end are exposed to the outside of the hull 10, but most of the hull (including the front end (not shown) of the rotating shaft 102) 10) Connected to the engine in a state located inside.

Meanwhile, the hub vortex power generation unit 110 is coupled to the hub 103 forming the rear end of the rotation shaft 102 in the present embodiment, and the hub vortex generated at the rear of the hub 103 when the hub 103 is rotated. The rotational energy of the vortex is recovered as electrical energy.

The hub vortex power generation unit 110 is coupled to the generator shaft 113 is disposed rotatably relative to the hub 103, but is disposed outside the hub 103 is generated when the rotation of the rotating shaft 102 The generator blade 111 rotated by the vortex and the generator shaft 113 are rotatably coupled to each other and provided inside the hub 103 to rotate together with the hub 103, and the hub 103 and the generator blade 111. It includes a generator 112 for generating electrical energy based on the rotational energy according to the difference in relative rotation between.

By such a configuration, the generator 112 is installed in the hub 103 and the rotational flow caused by the hub vortex is generated by the generator blade 111 in a state in which the generator blade 111 connected to the generator 112 is disposed outside the hub 103. Rotate to produce electricity. In addition, by rotating the generator blade 111 it is possible to reduce the turbulence accompanying the hub vortex (hub vortex) it is also possible to improve the propulsion efficiency of the propeller (100).

Looking at this in detail, the generator blade 111 is rotated under the rotational force of the hub vortex, which is a vortex generated when the hub 103 rotates. The generator blade 111 is installed on the generator shaft 113, and the generator shaft 113 is connected to the generator 112 so as to be relatively rotatable to the hub 103. In this configuration, the hub 103 is rotated at the same rotational speed as the propeller 100 and the generator blade 111 is rotated at the same rotational speed as the rotational speed of the generator shaft 113. Due to the relative rotational speed of the generator 112 will produce electricity.

Since the rotation radius of the hub vortex is generally equal to or smaller than the radius of the hub 103, the diameter of the generator blade 111 is provided to be equal to or smaller than the diameter of the hub 103. This is because when the diameter of the generator blade 111 is larger than the diameter of the hub 103, the rotational efficiency due to the hub vortex is reduced and the self-resistance of the generator blade 111 is increased, so that the propulsion efficiency of the vessel may be lowered. to be.

In addition, since the rotation radius and the rotation force decrease as the hub vortex moves away from the end of the hub 103, the generator blade 111 is installed so that the hub blade 111 does not fall too far from the end of the hub 103.

Next, the generator 112 is provided inside the hub 103. The generator 112 is rotated together with the hub 103, but the generator shaft 113 connected to the generator 112 is connected to the generator 112 so as to rotate relative to the generator 112 in accordance with the rotation of the generator shaft 113. Development is possible. Of course, the rotation of the generator shaft 113 is made according to the rotation of the generator blade 111 is connected to the generator shaft 113.

That is, since the generator 112 and the generator shaft 113 are rotatably connected, the generator 112 rotates at the rotational speed of the propeller blade 101 and rotates by the hub vortex as described above. 111 rotates at the generator shaft 113 revolutions. And due to the relative rotational speed of the difference between these two revolutions is the electricity is produced in the generator (112).

Meanwhile, in the present embodiment, the generator 112 may further include a speed increaser (not shown) for increasing the rotation speed in order to improve power generation efficiency. In general, the generator 112 has an optimum efficiency at a high rotational speed of 1000rpm or more, but the propeller of the ship is a low-speed rotation of less than 100rpm causes a difference in the two rotational speeds. Therefore, the speed increaser may be installed in the generator 112 to increase the rotation speed input to the generator 112.

In addition, the ship according to the present embodiment may further include a wire (112a) for using the electric power generated in the generator (112). That is, in the hub vortex power generation unit 110 by connecting the electric wire 112a connected to an electric device (not shown) installed in the hull, for example, with a generator 112 through the inside of the rotating shaft 102. The generated power can be supplied to an electric device installed in the hull, for example, a battery.

4 is a view schematically illustrating a state in which a propeller, a hub vortex power generation unit, and a water jet injection unit of a ship according to a second embodiment of the present invention are coupled, and FIG. 5 is a water spray unit of the water jet injection unit of FIG. 4. Figure is shown.

The present embodiment differs from the above-described first embodiment only in a part of the constitution, and the other constitution is the same as the constitution of the first embodiment. Therefore, only the constitution having a difference in this embodiment will be described below do.

As shown in these figures, the ship according to the second embodiment of the present invention is coupled to the propeller 100 to reduce the propeller blade tip vortex to spray water in the propeller blade tip vortex travel direction. It further comprises a water jet injection unit 120.

Tip vortex cavitation occurs near the tip 101a of the propeller blade. Tip vortex refers to a vortex flow that rotates from the pressure side to the suction side due to the pressure difference between the pressure side and the suction side of the propeller blade 101, and rotates around the tip of the propeller blade 101. When a vortex occurs, the pressure at the center of rotation of the tip vortex is low enough to offset the centrifugal force caused by the rotation of the tip vortex, which creates a cavity in the center of rotation of the tip vortex. It generates considerable noise and vibration and causes the ship's propulsion efficiency to deteriorate.

In this embodiment, the water jet injection unit 120 is provided to improve such a problem, and the electricity generated by the generator 112 of the hub vortex power generation unit 110 is used as an energy source of the water jet injection unit 120. It is utilized. Hereinafter, a part in which the generator 112 of the hub vortex power generation unit 110 of the present embodiment is used as an energy source of the waterjet injection unit 120 will be described in detail.

Water jet injection unit 120 according to the present embodiment is provided on the propeller blade 101 to operate the water injection unit 121 and the electric energy produced by the hub vortex power generation unit 110 to inject water and is operated by the water injection unit ( It includes a water supply unit 122 for supplying water toward the 121, and a connection pipe 123 for connecting the water supply unit 122 and the water injection unit 121.

In this configuration, the waterjet injection unit 120 may inject water having a greater density than air in the vicinity of the propeller blade tip 101a. Here, the propeller blade tip 101a refers to points located farthest from the center 101c of the propeller blade 101 among the propeller blade 101 end points.

When water is injected near the propeller blade tip 101a, the angular momentum of the tip vortex does not change according to the law of conservation of momentum, and dense water is added to the tip vortex to reduce the rotational speed of the tip vortex. As a result, the centrifugal force of the tip vortex and the pressure drop generated at the center of rotation of the tip vortex to offset the tip vortex are also reduced, so that the generation of a cavity due to the tip vortex can be suppressed. Accordingly, vibration and noise due to the vortex cavitation of the propeller blade tip 101a can be prevented as a result and the propulsion efficiency of the propeller blade 101 can be improved.

The water spray unit 121 is a portion for spraying water to the outside of the propeller blade 101. As shown in detail in FIG. 5, the water spray unit 121 may be a plurality of water spray holes 121a formed in the end region of the propeller blade 101. However, the scope of the present invention is not limited thereto. For example, the water spraying unit 121 may be a nozzle.

The water sprayed from the plurality of water injection holes 121a is added to the tip vortex generated by the pressure difference between the suction surface and the pressure surface of the propeller blade 101 to decrease the rotational speed of the tip vortex and as a result, as mentioned above. Reduce cavitation as

The water supply unit 122 supplies water to the water spray unit 121 at high pressure. In the present embodiment, the water supply 122 is provided in the hub 103 of the rotary shaft 102, as shown in FIG.

The water supply unit 122 further includes a separate opening (not shown) that can be opened and closed on the outer side of the hub 103 and a supply pipe 122a connecting the water supply unit 122 to receive water through the hole. Can be. However, the scope of the present invention is not limited thereto, although not shown, the water supply unit 122 includes an injection pipe (not shown) connected to a water tank (not shown) disposed inside the hull 10. By connecting the water tank (not shown) and the water supply unit 122 may be supplied with water from the water tank (not shown) inside the hull 10.

The connection pipe 123 is used as a moving passage of water connecting the water supply unit 122 and the water injection unit 121. 4 to 5, the connection pipe 123 is provided inside the rotating shaft 102 and connected to the water supply part 122, and is provided inside the propeller blade 101 and the propeller blade 101. At least one branch pipe 123b branched from the main pipe 123a in the center 101c of the 101 and connected to the water spraying unit 121.

The connection pipe 123 may be provided to be disposed inside the rotating shaft 102 and the propeller blade 101. In this case, the main pipe 123a may have a straight line shape parallel to the rotary shaft 102, and the branch pipe 123b may have a spiral shape corresponding to the curved shape of the propeller blade 101.

In this embodiment, the water supply unit 122 provided in the hub 103 may include a pump (not shown) for applying pressure to the water. The pump acts to supply water to the water spraying unit 121 by applying pressure to the water so that water is sprayed from the water spraying unit 121. In this case, the water supply unit 122 may further include a control valve (not shown) for supplying the compressed water to the water injection unit 121.

Meanwhile, in the present embodiment, the generator 112 of the hub vortex power generation unit 110 is connected to the pump of the water supply unit 122 and serves to supply electricity to the pump. That is, the generator 112 produces electricity by the rotation of the generator blade 111 by the hub vortex, and the produced electricity is provided to the pump.

When the pump is driven by receiving electricity from the generator 112 of the hub vortex power generation unit 110 as described above, the water passes through the main pipe 123a inside the hub 103 and the rotating shaft 102 and propeller blades 101. After branching in the central region of the at least one branch pipe 123b to move, it is sprayed to the outside of the propeller blade 101 through a plurality of water spray holes (121a).

In the above-described embodiments, the hub vortex power generation unit 110 has been described above with respect to the hub 103 of the rotating shaft 102. However, if the hub vortex energy is a suitable place for recovering the hub vortex energy, the appropriate rotating shaft 102 other than the hub 103 may be used. It may be installed in the area of.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

10: Hull
100: propeller 110: hub vortex power generation unit
120: water jet injection unit 101: propeller blade
102: rotating shaft 103: hub
111: blade 112: generator
121: water injection unit 122: water supply unit
123: connecting piping

Claims (12)

A propeller blade and a rotation shaft connected to a central region of the propeller blade to form a rotation axis of the propeller blade, the propeller being coupled to the hull to generate a propulsion force; And
It is coupled to the propeller, and includes a hub vortex power generation unit for generating electrical energy based on the rotational energy by the hub vortex (hub vortex) generated when the propeller,
The hub vortex power generation unit is coupled to a hub (hub) forming the rear end of the rotating shaft,
The hub vortex power generation unit,
A generator blade coupled to a generator shaft disposed rotatably with respect to the hub, the generator blade being disposed outside the hub and rotated by a hub vortex generated when the rotation shaft is rotated; And
The generator shaft is coupled to be rotatable relative to the inside of the hub is rotated with the hub, comprising a generator for generating electrical energy based on the rotational energy according to the relative rotational difference between the hub and the generator blade Ship. delete delete The method of claim 1,
The generator further includes a speed increaser for increasing a rotation speed input to the generator. The method of claim 1,
Wherein the diameter of the blade is equal to or smaller than the diameter of the hub. A propeller blade and a rotation shaft connected to a central region of the propeller blade to form a rotation axis of the propeller blade, the propeller being coupled to the hull to generate a propulsion force;
A hub vortex power generation unit coupled to the propeller and generating electrical energy based on rotational energy caused by a hub vortex generated when the propeller is rotated; And
It includes a waterjet injection unit coupled to the propeller to spray water in the direction of the propeller blade tip vortex to reduce the propeller blade tip vortex cavitation generated when the propeller blade is rotated,
The hub vortex power generation unit is coupled to the hub (hub) forming the rear end of the rotating shaft. The method according to claim 6,
The water jet injection unit,
A water spray unit provided on the propeller blades to spray water;
A water supply unit which is operated by receiving electrical energy produced by the hub vortex power generation unit and supplies water toward the water spray unit; And
Vessel comprising a connection pipe for connecting the water supply and the water spray. The method of claim 7, wherein
The water spraying unit, characterized in that the water injection hole formed in the end region of the wings forming the propeller blades. The method of claim 7, wherein
The connection piping includes:
A main pipe provided inside the rotating shaft and connected to the water supply unit; And
And at least one branch pipe provided in the propeller blade and branched from the main pipe in the central region of the propeller blade to be connected to the water spraying unit. The method of claim 7, wherein
The water supply unit, the vessel comprising a pump for supplying water to the water injection unit by applying pressure to the water. The method of claim 7, wherein
The water supply unit,
A hole openable to the hub outer surface; And
A supply pipe connecting the hole and the water supply unit,
Vessel receiving water through the hole. The method of claim 7, wherein
The water supply unit includes a water injection pipe connecting the water tank and the water supply inside the hull,
Vessel receiving water from the water tank.

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