Hull direct-connection type propelling device of contra-rotating propeller and manufacturing method of hull direct-connection type propelling device

Abstract

The purpose of the present invention is to provide a hull-direct-connection-type propulsion device of a contra-rotating propeller and a method for manufacturing the same, the propulsion efficiency of an electrically propelled ship being greatly improved by disposing the contra-rotating propeller attached to the electrically propelled ship so as to be directly connected to the hull. In order to achieve the purpose, the hull-direct-connection-type propulsion device of the contra-rotating thruster according to the present invention comprises: a contra-rotating thruster comprising a front propeller and a rear propeller; a dual-rotor motor for generating respective rotation directions of the front propeller and the rear propeller; and the double shafts are used for connecting the contra-rotating thruster and the double-rotor motor.

Description

Technical Field

[0001] This invention relates to a hull-directly connected propulsion device with a counter-rotating thruster and its manufacturing method. More specifically, it relates to a hull-directly connected propulsion device with a counter-rotating thruster and its manufacturing method, wherein the counter-rotating thruster installed on an electric propulsion vessel is configured to be directly connected to the hull, thereby significantly improving the propulsion efficiency of the vessel. This can be achieved by removing the gearbox used to realize the counter-rotation of the counter-rotating thruster, allowing the internal space of the vessel to be used for other purposes, and reducing energy loss. Background Technology

[0002] A contra-rotating propeller is a propeller in which two propellers, mounted on the same axis, rotate in opposite directions to generate thrust. It is mainly used for propulsion in ships or aircraft.

[0003] In this type of counter-rotating propeller, the two propellers rotate in different directions, and the rotational turbulence generated by each propeller naturally cancels out and is reduced through their interaction.

[0004] Therefore, compared with a single propeller that uses one propeller to generate thrust, a counter-rotating propeller has the advantages of generating high thrust and excellent straight-line performance, thus greatly improving propulsion efficiency and significantly reducing vibration caused by rotating turbulence.

[0005] Typically, a marine propulsion system using a twin-reverse propeller includes: an inner shaft connected to a power source inside the hull; a rear propeller attached to the rear end of the inner shaft; a hollow outer shaft rotatably mounted on the outer surface of the inner shaft; and a front propeller attached to the rear end of the outer shaft.

[0006] In this case, a contra-rotating gearbox is used as a means to make the front propeller rotate in the opposite direction to the rotation of the rear propeller.

[0007] In traditional engine-driven ships, due to the limitation of the engine's rotation direction, a gearbox is required to achieve the counter-rotation of the counter-rotating propeller.

[0008] However, the gearbox contributes to energy loss because it causes the two propellers to rotate in opposite directions. As a result, the propulsion efficiency of counter-rotating propellers decreases as energy loss intensifies.

[0009] To address this issue, a prior art technique for a counter-rotating propeller-type thruster driven by a superconducting electric motor without a gearbox is disclosed. This thruster is driven by one or more electric motors without a gearbox, thus achieving a structure with relatively improved propulsion efficiency and reduced energy loss compared to conventional structures driven by ordinary conductive electric motors and gearboxes.

[0010] However, the aforementioned prior art is a counter-rotating propulsion system that utilizes a superconducting electric motor. In order for the superconducting electric motor to operate, a cooling device must be included to provide cryogenic refrigerant for cooling the superconducting coils, which leads to increased energy loss and complicated maintenance of electric propulsion ships.

[0011] Therefore, there is an urgent need to develop an electric propulsion ship that can drive the counter-rotating propellers through a dual-shaft configuration. The dual-shaft configuration is as follows: the ship's propulsion efficiency is improved by configuring the counter-rotating propellers as a type directly connected to the hull, and the dual rotors are realized in the electric motor by eliminating the gearbox and the lubrication system attached to the gearbox, thereby eliminating the gearbox.

[0012] Existing technical documents

[0013] Patent documents

[0014] Patent Document 0001: Korean Patent Publication No. 10-1380650

[0015] Patent Document 0002: Korean Patent Publication No. 10-1606242

[0016] Patent document 0003: Korean Patent Publication No. 10-2014-0025004

[0017] Patent document 0004: Japanese Patent Publication No. 2022-000359 Summary of the Invention

[0018] Technical issues

[0019] The purpose of this invention to solve the above problems is to provide a hull-directly connected propulsion device for counter-rotating thrusters and its manufacturing method, which significantly improves the propulsion efficiency of electric propulsion ships by configuring the counter-rotating thrusters installed on electric propulsion ships to be directly connected to the hull.

[0020] Furthermore, the purpose of this invention is to provide a hull-direct propulsion device with a counter-rotating propulsion system and its manufacturing method, which realizes dual rotors in the electric motor, thereby allowing the internal space of the ship to be used for other purposes by eliminating the dual-shaft structure in the form of a gearbox, reducing energy loss, and facilitating maintenance.

[0021] Technical solution

[0022] To achieve the aforementioned objective, the hull-direct propulsion device of the present invention with a counter-rotating propulsion system is characterized by comprising: a counter-rotating propulsion system consisting of a front propeller and a rear propeller; a dual-rotor motor for generating the respective rotational directions of the front propeller and the rear propeller; and a dual shaft for connecting the counter-rotating propulsion system and the dual-rotor motor.

[0023] Furthermore, the hull-direct propulsion device of the present invention is characterized in that the counter-rotating propulsion unit is connected to the dual shafts located at the stern end of the hull and is disposed outside the stern.

[0024] Furthermore, the hull-direct propulsion device of the counter-rotating propulsion of the present invention is characterized in that, in the counter-rotating propulsion, the front propeller and the rear propeller are disposed on the dual shafts and rotate in different directions respectively.

[0025] Furthermore, the hull-direct-drive propulsion device of the counter-rotating propulsion system of the present invention is characterized in that, in the dual-rotor motor, rotors and stators that operate by induction power are arranged in pairs in sequence, so that the counter-rotating propulsion system rotates.

[0026] Furthermore, the hull-direct propulsion device of the counter-rotating propulsion system of the present invention is characterized in that the rotor includes an outer rotor and an inner rotor, the outer rotor is disposed outside the dual rotor motor and rotates in one direction, and the inner rotor rotates in the opposite direction to the rotation direction of the outer rotor.

[0027] Furthermore, the hull-direct propulsion device of the counter-rotating propulsion system of the present invention is characterized in that, in the rotor, the outer rotor and the inner rotor include permanent magnets or rotor cores.

[0028] Furthermore, the hull-direct-drive propulsion device of the present invention for a counter-rotating propulsion system is characterized in that, when the external coil and the internal coil are used simultaneously, the stator is composed of a single stator, and when the external coil and the internal coil are used alone, the stator is composed of multiple stators.

[0029] Furthermore, the hull-direct propulsion device of the present invention with a counter-rotating propulsion system is characterized in that the dual shafts are connected to the end of the dual rotor motor, one side rotates in one direction, and the other side rotates in the opposite direction to the first side.

[0030] Furthermore, the hull-direct propulsion device of the present invention with a counter-rotating propulsion system is characterized in that the dual shafts are connected to the ends of the dual rotor motors and include an outer shaft and an inner shaft that rotate in opposite directions.

[0031] Furthermore, the hull-direct propulsion device of the present invention with a counter-rotating propulsion system is characterized in that, in the dual shafts, a bearing for supporting the outer shaft and the inner shaft is provided on the side where the outer shaft intersects with the hull.

[0032] On the other hand, in order to achieve the aforementioned objective, the method for manufacturing a hull-direct-connected propulsion device for a counter-rotating propeller of the present invention is characterized by comprising: step a, providing a dual-rotor motor inside the hull for generating the respective rotational directions of the front propeller and the rear propeller of the counter-rotating propeller; step b, providing a dual shaft inside the hull connected to the ends of the dual-rotor motor; and step c, connecting the counter-rotating propeller to the ends of the dual shaft and providing it outside the stern of the hull.

[0033] Furthermore, the manufacturing method of the hull-direct-drive propulsion device of the present invention is characterized in that, in step a, the rotor and stator, which operate by induction power, are sequentially arranged in pairs on the dual-rotor motor.

[0034] Specific details of other embodiments are included in the "Detailed Description" and the "Drawings".

[0035] The advantages and / or features of the present invention, as well as the methods of implementing them, will become clear by referring to the accompanying drawings and various embodiments described in detail below.

[0036] However, the present invention is not limited to the structures of the embodiments disclosed below, and can be implemented in various different forms. It should be understood that the embodiments disclosed in this specification are provided to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the present invention. The present invention is defined only by the scope of the claims.

[0037] The effects of the invention

[0038] According to the present invention, by configuring the counter-rotating propulsion unit as a hull-direct type, the propulsion efficiency of the ship is increased. By realizing a dual-shaft configuration that eliminates the gearbox, the internal space of the ship can be used for other purposes, energy loss is reduced, and maintenance is easier. Attached Figure Description

[0039] Figure 1 A cross-sectional view illustrating the application of the propulsion device of an embodiment of the present invention to a ship.

[0040] Figure 2 A conceptual diagram illustrating the concept of a propulsion device according to an embodiment of the present invention.

[0041] Figure 3 This is a structural diagram illustrating the structure of a dual-rotor motor according to an embodiment of the present invention.

[0042] Figure 4 A conceptual diagram illustrating the dual-axis concept of an embodiment of the present invention.

[0043] Figure 5 A flowchart illustrating a method for manufacturing a propulsion device according to an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures

[0045] 10:Hull

[0046] 100: Counter-rotating thruster

[0047] 110: Front propeller

[0048] 120: Rear propeller

[0049] 200: Dual-rotor motor

[0050] 210: Rotor

[0051] 212: External rotor

[0052] 214: Internal rotor

[0053] 220: Stator

[0054] 222: External coil

[0055] 224: Internal coil

[0056] 300: Dual-axis

[0057] 310: Outer shaft

[0058] 320: Inner shaft

[0059] 1000: Direct-drive propulsion system for ships with counter-rotating thrusters Detailed Implementation

[0060] Before describing the present invention, it should be understood that the terms or words used in this specification should not be interpreted in a conventional or dictionary sense, but rather should be used in a way that allows the inventor to define the concepts of the terms appropriately in order to best explain their invention. Furthermore, these terms or words should be interpreted in a sense that is consistent with the technical idea of ​​the present invention.

[0061] That is, it should be understood that the terminology used in this specification is only for describing preferred embodiments of the invention and is not intended to specifically limit the scope of the invention. These terms are defined in view of the various possibilities of the invention.

[0062] Furthermore, it should be understood in this specification that, unless the context clearly indicates a different meaning, a singular expression may include a plural expression. Similarly, even when expressed in a plural form, it may include a singular meaning.

[0063] Throughout this specification, when a structural element is described as "comprising" another structural element, it may mean, rather than excluding, that any other structural element may also be included, unless the description has a particularly contrary meaning.

[0064] Furthermore, it should be understood that when a structural element is described as "existing or connected within other structural elements", the structural element may be directly connected to or in contact with other structural elements, or it may be separated from other structural elements by a specified distance. In the case of being separated from other structural elements by a specified distance, there may be a third structural element or means for fixing or connecting the structural element to other structural elements, and the description of the third structural element or means may be omitted.

[0065] Conversely, when a structural element is described as being "directly connected" or "directly linked" to other structural elements, it should be understood that there is no third structural element or means.

[0066] Similarly, other expressions describing the relationships between structural elements, such as “between” and “directly between”, or “adjacent to” and “directly adjacent to”, should also be interpreted as having the same meaning.

[0067] Furthermore, it should be understood in this specification that the use of terms such as "one side," "the other side," "one side," "the other side," "first," and "second" is to clearly distinguish a structural element from other structural elements, and the meaning of the corresponding structural element is not limited by these terms.

[0068] Furthermore, in this specification, if terms related to position such as "upper," "lower," "left," and "right" are used, they should be understood as indicating the relative position of the corresponding structural element in the corresponding drawing. Unless their absolute positions are specifically specified, these positional terms should not be understood as referring to absolute positions.

[0069] Furthermore, in this specification, when structural elements in the drawings are labeled, even if the same structural element is shown in different drawings, the same reference numerals indicate the same structural element; that is, the same reference numerals indicate the same structural element throughout the specification.

[0070] In the accompanying drawings of this specification, in order to fully and clearly convey the ideas of the present invention or for ease of explanation, the size, position, connection relationship, etc. of the various structural elements of the present invention may be exaggerated, reduced or omitted, and therefore their proportions or dimensions may not be strict.

[0071] Furthermore, in the following description of the invention, details of elements that may be deemed unnecessarily obscuring the spirit of the invention, such as well-known techniques including prior art, may be omitted.

[0072] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0073] Figure 1 A cross-sectional view illustrating the application of the propulsion device of this embodiment of the invention to a ship. Figure 2 A conceptual diagram illustrating the concept of a propulsion device according to an embodiment of the present invention.

[0074] Reference Figure 1 and Figure 2 According to one embodiment of the present invention, the hull-direct propulsion device of the counter-rotating thruster can be configured to include a counter-rotating thruster 100, a dual-rotor motor 200 and a dual-shaft 300.

[0075] As described above, the hull-direct propulsion device of the present invention, which is a counter-rotating propulsion device, provides a device that can increase the propulsion efficiency of the hull 10 by placing the counter-rotating propulsion device 100 at the outer end of the stern of the hull 10.

[0076] Specifically, such as Figure 1 and Figure 2 As shown, the counter-rotating propeller 100 of one embodiment of the present invention can be the following device: including a front propeller 110 and a rear propeller 120, the front propeller 110 and the rear propeller 120 are arranged side by side on a dual shaft 300 located at the outer end of the stern of the hull 10, and rotate in different directions (e.g., clockwise and counterclockwise).

[0077] In one embodiment of the present invention, the counter-rotating thruster 100 is connected to the other side of the dual shaft 300, the direction of which is opposite to the direction of one side of the dual shaft 300 connected to the dual rotor motor 200. Since the action of the dual rotor motor 200 is transmitted to the counter-rotating thruster 100 through the dual shaft 300, the front propeller 110 and the rear propeller 120 included in the counter-rotating thruster 100 can rotate in different directions respectively.

[0078] Specifically, the front propeller 110 of the counter-rotating thruster 100 can be connected to the outer shaft 310 of the twin shaft 300, which is connected to a dual-rotor motor 200 located inside the hull. The rear propeller 120 of the counter-rotating thruster 100 can be connected to the inner shaft 320 of the twin shaft 300, which is connected to the dual-rotor motor 200.

[0079] The rotational motion generated by the dual-rotor motor 200 is transmitted to the counter-rotating thruster 100, so that the front propeller 110 and the rear propeller 120 can rotate in different directions respectively.

[0080] However, it is not limited to this. The counter-rotating propeller 100 can refer to the device in which the front propeller 110 and the rear propeller 120 are respectively connected to the outer shaft 310 and the inner shaft 320 of the twin shafts 300.

[0081] On the other hand, due to the movement of the multiple propellers of the counter-rotating thruster 100 rotating in opposite directions, the wake flow discharged by the front propeller 110 increases the angle of attack of the cross section of the rear propeller 120 and reduces the velocity component in the rotation direction, thereby improving the lift-to-dragratio ratio of the rear propeller 120 cross section.

[0082] Conversely, the counter-rotating thruster 100 of one embodiment of the present invention can rectify the disturbance of the wake generated by the rear blades of the front propeller 110 by drawing the rear propeller 120 into the wake, and improve the lift-to-drag ratio of the front propeller 110 cross section.

[0083] The lift-to-drag ratio can be defined as the ratio of the air or water resistance that occurs when a moving body moves forward to the air or water resistance that occurs when it moves in the opposite direction.

[0084] In one embodiment of the present invention, the counter-rotating propulsion unit 100 is directly connected to the stern shaft hub of the ship, and with the improvement of the lift-to-drag ratio, it has the effect of increasing the propulsion efficiency of the ship.

[0085] And, as Figure 1 and Figure 2 As shown, the counter-rotating propulsion unit 100 of this embodiment can be connected to the end of the dual shaft 300 located at the stern end of the hull 10 and disposed outside the stern of the hull 10.

[0086] Specifically, in one embodiment of the present invention, the counter-rotating propeller 100 can be directly connected to a streamlined portion (e.g., the stern boss) protruding rearward from the hull 10 to support the dual shafts 300.

[0087] In one embodiment of the present invention, the counter-rotating thruster 100 is connected to the end of the dual shaft 300 located at the stern hub of the hull 10 and is directly connected to the stern hub, thereby having the following effects: reducing the inflow disturbance caused by other structures of the hull (e.g., hull and struts) and allowing the flow through the hull to flow directly into the counter-rotating thruster 100.

[0088] Therefore, in the hull-direct-connected propulsion device 1000 of the counter-rotating propulsion device according to an embodiment of the present invention, by reducing the influence caused by other structures of the hull (e.g., disturbance of the inflow), the propulsion efficiency of the counter-rotating propulsion device 100 can be increased by designing the front propeller 110 and the rear propeller 120 according to the direction of the inflow.

[0089] Figure 3 This is a structural diagram illustrating the structure of a dual-rotor motor according to an embodiment of the present invention.

[0090] Reference Figure 3 The hull-direct propulsion device of the counter-rotating propulsion system in this embodiment of the invention can be configured such that the dual rotor motor 200 includes a rotor 210 and a stator 220.

[0091] The rotor 210 rotates with the current through the magnetic field generated in the stator 220 and generates mechanical rotational power. The stator 220 can refer to the device that generates a magnetic field when the current flows through the coil.

[0092] On the other hand, in a dual-rotor motor 200 of an embodiment of the present invention, rotors 210 and stators 220 are arranged in pairs in sequence, thereby enabling the counter-rotating thruster 100 to rotate.

[0093] Specifically, the dual-rotor motor 200 is connected to one side of the dual shaft 300, generates power through the movement of the rotor 210 and stator 220, and transmits the generated rotational power to the counter-rotating thruster 100 through the dual shaft 300, so that the dual-rotor motor 200 can make the front propeller 110 and the rear propeller 120 of the counter-rotating thruster 100, which is connected to the other side of the dual shaft 300, rotate respectively.

[0094] Furthermore, the dual rotor motor 200 can use an induction motor or a permanent magnet that utilizes induced power.

[0095] Preferably, the dual-rotor motor 200 of an embodiment of the present invention can be a device that utilizes an induction motor, wherein the induction motor uses induced electricity to operate the rotor 210 and stator 220 arranged in pairs sequentially.

[0096] The rotor 210 of one embodiment of the present invention can be configured to include an outer rotor 212 and an inner rotor 214.

[0097] Specifically, the external rotor 212 is located outside the dual rotor motor 200 and can rotate in one direction via the stator 220, which is paired with the external rotor 212.

[0098] Similarly, the inner rotor 214 is located inside the dual rotor motor 200 and can rotate in the opposite direction to the rotation direction of the outer rotor 212 via the stator 220 that is paired with the inner rotor 214.

[0099] The rotation direction of the outer rotor 212 and the inner rotor 214 can be the same as the rotation direction of the front propeller 110 and the rear propeller 120 of the counter-rotating thruster 100.

[0100] Furthermore, in one embodiment of the present invention, the outer rotor 212 and the inner rotor 214 can be configured to include a permanent magnet or a rotor core (armature core), respectively.

[0101] On the other hand, the stator 220 of one embodiment of the present invention can be configured to include an outer coil 222 and an inner coil 224.

[0102] The external coil 222 can control the rotation of the external rotor 212, and the internal coil 224 can control the rotation of the internal rotor 214.

[0103] Specifically, the rotation of the external rotor 212 can be controlled by the external coils 222 of the stator 220, which are paired with the external rotor 212.

[0104] Similarly, the internal rotor 214 can be controlled to rotate by the internal coils 224 of the stator 220 that are paired with the internal rotor 214.

[0105] Furthermore, when both the external coil 222 and the internal coil 224 are used simultaneously, the stator 220 of one embodiment of the present invention can be composed of a single stator 220. When the external coil 222 and the internal coil 224 are used separately, the stator 220 of one embodiment of the present invention can be composed of multiple stators.

[0106] For example, when both the external coil 222 and the internal coil 224 are used, the rotation of the external rotor 212 and the internal rotor 214 can be controlled by simply controlling the direction of the current flowing through the external coil 222 and the internal coil 224, so it can be constructed from a single stator 220.

[0107] Conversely, when using the outer coil 222 and the inner coil 224 respectively, the stator 220 must not only consider the direction of the current flowing through the outer coil 222 and the inner coil 224, but also the insulation between the outer coil 222 and the inner coil 224 and the tightness of the bearings. Therefore, it can be composed of multiple stators 220.

[0108] Furthermore, in the dual-rotor motor 200 of the present invention, a rotor 210 and a stator 220 that operate using induced electricity are arranged in pairs in sequence, and the distance between the rotor 210 and the stator 220, the number of magnets included in the dual-rotor motor 200, and the number of coils can be changed.

[0109] That is, the dual rotor motor 200 is configured to have coils arranged sequentially, which has the effect of continuously controlling the outer shaft 310 and inner shaft 320 of the dual shaft 300 connected to the dual rotor motor 200 by controlling the current and voltage.

[0110] This configuration of the dual rotor motor 200 increases the control freedom of the propulsion device 1000, making it easier to maintain, and reduces energy loss as propulsion efficiency increases, even when the electric propulsion vessel is affected by complex marine environments.

[0111] Figure 4 A conceptual diagram illustrating the dual-axis concept of an embodiment of the present invention.

[0112] Reference Figure 4 In this embodiment of the invention, the dual-shaft 300 of the hull-direct-drive propulsion device of the counter-rotating propulsion system can be configured to include an outer shaft 310 and an inner shaft 320.

[0113] In a dual-shaft 300 according to an embodiment of the present invention, the outer shaft 310 and the inner shaft 320 are respectively connected to the outer rotor 212 and the inner rotor 214 of the dual-rotor motor 200, so that they can rotate in opposite directions by the rotational power generated by the dual-rotor motor 200.

[0114] Furthermore, in one embodiment of the present invention, a bearing for supporting the outer shaft 310 and the inner shaft 320 may be provided on the side where the outer shaft 310 intersects with the hull 10 in the dual shaft 300.

[0115] Specifically, in one embodiment of the present invention, the outer shaft 310 and the inner shaft 320 are configured to be connected to bearings connected to the dual rotor motor 200, so that the rotational power generated by the operation of the dual rotor motor 200 can be transmitted to the counter-rotating thruster 100.

[0116] In embodiments of the present invention, for ease of explanation, the device or component connecting the outer shaft 310 and the inner shaft 320 is described as a bearing, but is not limited thereto; any device or component made of metal for connecting or separating the outer shaft 310 and the inner shaft 320 may be used.

[0117] When bearings for connecting or supporting the outer shaft 310 and the inner shaft 320 are not provided in the dual shaft 300, the N pole and S pole are continuously changed by the rotating dual rotor motor 200. Therefore, due to the noise generated by the dual rotor motor 200 (e.g., magnetic field interference), the inner rotor 214 that causes the inner shaft 320 to rotate may idle.

[0118] However, the hull-direct propulsion device 1000 of the counter-rotating propulsion system of one embodiment of the present invention includes bearings for connecting or supporting the outer shaft 310 and the inner shaft 320, thus having the effect of reducing noise between the dual rotor motor 200 and the dual shafts 300.

[0119] In other words, the dual shaft 300 in this embodiment of the invention can be a device that extends from the dual rotor motor 200 located inside the hull 10 to the stern shaft hub of the hull 10 and connects the dual rotor motor 200 and the counter-rotating propeller 100.

[0120] Furthermore, in one embodiment of the present invention, the dual-shaft 300 realizes dual rotors in the dual-rotor motor 200, thereby replacing the gearbox provided for achieving counter-rotation. The dual-shaft 300 can be configured to enable the multiple propellers of the counter-rotating thruster 100 to perform counter-rotation.

[0121] Therefore, in the hull-direct propulsion device 1000 of the counter-rotating propulsion unit according to an embodiment of the present invention, the dual shafts 300 replace the function of the gearbox, thereby eliminating the gearbox and the lubrication system attached to the gearbox, and can achieve a shaft with a simpler shape than ships equipped with gearboxes.

[0122] Therefore, the hull-direct-connected propulsion device 1000 of the counter-rotating propulsion device according to an embodiment of the present invention has the effect of increasing the control freedom of the hull propulsion device and being easy to maintain even when the electric propulsion ship is affected by the complex marine environment.

[0123] Figure 5 A flowchart illustrating a method for manufacturing a propulsion device according to an embodiment of the present invention.

[0124] Reference Figure 5 The manufacturing method of the propulsion device according to the present invention may include: step S100, providing a dual rotor motor 200 inside the hull 10 for generating the respective rotation directions of the front propeller 110 and the rear propeller 120 of the counter-rotating propeller 100; step S200, providing a dual shaft 300 inside the hull 10 connected to the end of the dual rotor motor 200; and step S300, connecting the counter-rotating propeller 100 to the end of the dual shaft 300 and providing it outside the stern of the hull 10.

[0125] In step S100, a dual-rotor motor 200 for supplying rotational power to the counter-rotating thruster 100 may be installed inside the hull 10.

[0126] Specifically, in step S100, the rotor 210 and stator 220, which operate by induction, can be sequentially paired and installed in a dual-rotor motor 200 installed inside the hull 10.

[0127] In step S100 of the manufacturing method of the propulsion device according to an embodiment of the present invention, in order to generate rotational power in the same direction as the rotation of the plurality of propellers of the counter-rotating thruster 100, the rotor 210 and the stator 220 can be configured as two layers in the dual rotor motor 200.

[0128] In step S100, by setting the rotor 210 and stator 220 as two layers in the dual rotor motor 200, the rotation directions of the front propeller 110 and the rear propeller 120 of the counter-rotating thruster 100 can be controlled differently.

[0129] For example, since the rotor 210 and stator 220 are set as two layers in the dual rotor motor 200 in step S100, when the current propeller 110 rotates to one side, the rear propeller 120 can rotate in the opposite direction to the rotation direction of the front propeller 110.

[0130] In step S200, the dual shaft 300 can be positioned at the end of the dual rotor motor 200 that is positioned inside the hull 10 in step S100.

[0131] Specifically, in step S200, the dual shaft 300 can be configured to connect to the end of the dual rotor motor 200 disposed inside the hull 10 and extend from the dual rotor motor 200 to the stern shaft hub of the hull 10.

[0132] In step S200, the dual shaft 300 can be configured to be connected to the end of a dual-rotor motor and includes an outer shaft 310 and an inner shaft 320 that rotate in opposite directions.

[0133] Furthermore, in step S200, a bearing for supporting the outer shaft 310 and the inner shaft 320 may be provided on the side of the dual shaft 300 where the outer shaft 310 intersects with the hull 10.

[0134] In step S300, a counter-rotating thruster 100 may be provided on the other side of the dual shaft 300 located at the stern hub of the hull 10, wherein the direction of the other side of the dual shaft 300 is opposite to the direction of one side of the dual shaft 300 connected to the end of the dual rotor motor 200.

[0135] Specifically, in step S300, the counter-rotating thruster 100 can be directly connected to the hull 10 via a dual shaft 300 located at the stern hub of the hull 10.

[0136] In other words, in the manufacturing method of the hull-direct-connected propulsion device 1000 of the counter-rotating propulsion device of the present invention, the dual rotor motor 200 and dual shaft 300 of the present invention are provided inside the hull 10, thereby facilitating ship maintenance by removing the gearbox of the propulsion device for propelling the ship from the rotating drive shaft.

[0137] Furthermore, in this embodiment of the invention, the counter-rotating thruster 100 is disposed at the end of the dual shafts 300 located at the stern hub of the hull 10, thereby reducing the disturbance of the inflow into the counter-rotating thruster 100 caused by other structures of the hull (e.g., hull or struts), thus increasing the propulsion efficiency of the counter-rotating thruster 100.

[0138] The above examples illustrate various preferred embodiments of the present invention. However, the descriptions of the various embodiments described in the "Detailed Description" section are merely exemplary. Those skilled in the art to which this invention pertains can clearly understand from the above description that the present invention can be implemented by various modifications or by implementations equivalent to the present invention.

[0139] Furthermore, since the present invention can be implemented in various other forms, the present invention is not limited to the above description. It should be understood that the above description is only to make the disclosure of the present invention more complete and to fully inform those skilled in the art of the present invention of the scope of the present invention. The present invention is defined only by the claims in the claims.

Claims

1. A hull-direct propulsion device for a counter-rotating propulsion system, characterized in that, include: The counter-rotating propulsion system consists of a front propeller and a rear propeller. A dual-rotor motor is used to generate the respective rotational directions of the front propeller and the rear propeller; as well as A dual shaft is used to connect the counter-rotating thruster and the dual-rotor motor.

2. The hull-direct propulsion device with a counter-rotating thruster according to claim 1, characterized in that, The counter-rotating propulsion unit is connected to the dual shafts located at the stern end of the hull and is disposed outside the stern.

3. The hull-direct propulsion device with a counter-rotating thruster according to claim 2, characterized in that, In the counter-rotating propeller, the front propeller and the rear propeller are mounted on the dual shafts and rotate in different directions.

4. The hull-direct propulsion device with a counter-rotating thruster according to claim 1, characterized in that, In the dual-rotor motor, rotors and stators that operate by induction are arranged in pairs, causing the opposing thrusters to rotate.

5. The hull-direct propulsion device with a counter-rotating thruster according to claim 4, characterized in that, The rotor includes an outer rotor and an inner rotor. The outer rotor is disposed outside the dual-rotor motor and rotates in one direction, while the inner rotor rotates in the opposite direction to the rotation of the outer rotor.

6. The hull-direct propulsion device with a counter-rotating thruster according to claim 5, characterized in that, In the rotor, the outer rotor and the inner rotor include permanent magnets or rotor cores.

7. The hull-direct propulsion device with a counter-rotating thruster according to claim 5, characterized in that, The stator includes an external coil for controlling the outer rotor and an internal coil for controlling the inner rotor.

8. The hull-direct propulsion device with a counter-rotating thruster according to claim 7, characterized in that, When the external coil and the internal coil are used simultaneously, the stator consists of a single stator; when the external coil and the internal coil are used alone, the stator consists of multiple stators.

9. The hull-direct propulsion device with a counter-rotating thruster according to claim 1, characterized in that, The dual shafts are connected to the end of the dual-rotor motor, with one side rotating in one direction and the other side rotating in the opposite direction.

10. The hull-direct propulsion device with a counter-rotating thruster according to claim 1, characterized in that, The dual shafts are connected to the end of the dual-rotor motor and include an outer shaft and an inner shaft that rotate in opposite directions.

11. The hull-direct propulsion device with a counter-rotating thruster according to claim 10, characterized in that, In the dual shafts, a bearing for supporting the outer shaft and the inner shaft is provided on the side where the outer shaft intersects with the hull.

12. A method for manufacturing a hull-direct propulsion device with a counter-rotating thruster, characterized in that, include: Step (a) involves installing a dual-rotor motor inside the hull to generate the respective rotational directions of the front and rear propellers of the counter-rotating propeller; Step (b) involves installing a dual shaft inside the hull that is connected to the end of the dual-rotor motor; as well as Step (c) involves connecting the counter-rotating thruster to the end of the dual shafts and placing it outside the stern of the hull.

13. The method for manufacturing a hull-direct-drive propulsion device with a counter-rotating thruster according to claim 12, characterized in that, In step (a), the rotor and stator of the dual-rotor motor are arranged in pairs to operate by induction.

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