High-power non-contact induction-excited rim thruster for ships

Abstract

The present application provides a high-power, non-contact, induction-excited rim thruster for ships, characterized by comprising a conduit assembly for fixed connection to the hull, a rotor ring assembly disposed within the conduit assembly, and a hub assembly for supporting the rotor ring assembly. The hub assembly is connected to the conduit assembly via a support member. The conduit assembly includes a conduit, a metal plate assembly disposed within the conduit assembly for generating a periodic induced electric field, two sets of excitation windings with opposite windings symmetrically disposed on opposite sides of the metal plate assembly, and a rotor ring disposed between the two excitation windings and a rotor plate assembly disposed with the metal plate assembly. The motor stator excitation windings of the present invention are axially arranged, fully utilizing space, making the conduit thin and lightweight, and reducing resistance. Consequently, the motor has the advantages of small footprint, high propulsion efficiency, high thrust, long service life, and easy maintenance. The motor is particularly suitable for use on ships requiring high-power electric propulsion.

Description

Technical Field

[0001] The present invention belongs to the field of ship propulsion, and in particular relates to a high-power non-contact induction excitation rim propulsion for ships. Background Art

[0002] In recent years, with the needs of naval defense construction and the development of maritime trade, the performance requirements for ship propulsion systems have become increasingly stringent. The disadvantages of traditional shaft-driven propulsion systems have become increasingly apparent, and they are no longer able to meet these requirements. For example, traditional shaft-driven propulsion systems have many components, complex structures, large cabin space occupation, high energy loss, difficulty in vibration and noise control, and high construction and maintenance costs. These shortcomings have led to a gradual shift in attention to more advanced shaftless propulsion systems.

[0003] Currently, shaftless rim-driven propellers are driven by permanent magnet motors, using radially arranged excitation windings in a conduit to drive a rotor ring made of permanent magnets to rotate and generate thrust. The European patent "Shaftless Propeller" (EP1739007A1), the Chinese patent "Marine Permanent Magnet Motor Propeller Propeller" (CN104326073A), and the Chinese patent "Marine Permanent Magnet Motor Propeller" (CN104333172A) all refer to permanent magnet motor propellers. In this type of propulsion, the motor stator is placed in a cylindrical housing. The propeller blades are connected to the motor rotor and installed in the hollow part of the housing. When the motor is powered, the rotor drives the blades to rotate and generate thrust. This hubless structure helps reduce resistance and solve the problem of debris or cable entanglement, but the propeller power is limited by the size of the motor. Furthermore, the thrust generated by the blades is generally borne by water-lubricated hydrodynamic bearings at both ends of the rotor. The bearing load area is limited by the thickness of the housing, resulting in a low load capacity, which also restricts the development of high-power shaftless propellers. The Chinese patent application "Shaftless Driven Integrated Motor Propeller" (CN102632982A) describes a hub-type rim-driven propeller that retains a hub. The shaft mounted in the hub does not rotate, but rather serves to mount support bearings and transmit thrust. While this structure improves the bearing's load capacity, it still fails to address power limitations caused by undersized motors and insufficient magnetic field strength in the rotor's permanent magnets. In contrast, the present invention proposes a high-power, non-contact, induction-excited rim-driven propeller for ships. Summary of the Invention

[0004] The purpose of the present application is to provide a high-power non-contact induction-excited rim thruster for ships that can improve the efficiency and power of shaftless rim thrusters.

[0005] This application is implemented as follows:

[0006] A high-power non-contact induction-excited rim thruster for ships is characterized in that it includes a duct assembly for fixed connection to the hull, a rotor ring assembly arranged in the inner cavity of the duct assembly, and a hub assembly for supporting the rotor ring assembly. The hub assembly is connected to the duct assembly through a support member. The duct assembly includes a duct, a metal pole plate assembly for generating a periodic induced electric field is provided in the inner cavity of the duct, and two groups of excitation windings with opposite windings are symmetrically provided on both sides of the inner cavity of the metal pole plate assembly. The rotor ring includes a rotor ring arranged between the two excitation windings and a rotor pole plate assembly configured with the metal pole plate assembly.

[0007] In some optional embodiments, the metal plate assembly includes a metal sheet group arranged along the inner wall of the catheter and a catheter large plate arranged along the circumferential direction of the metal sheet group, and the catheter large plate is connected to an AC power source.

[0008] In some optional implementation schemes, the metal sheet group is arranged in a U shape, and the two excitation windings are respectively in contact with the two side walls of the U-shaped metal sheet group.

[0009] In some optional embodiments, the rotor pole plate assembly includes rotor outer pole plates and rotor inner pole plates respectively arranged along the outer circumference and inner circumference of the rotor ring.

[0010] In some optional embodiments, the hub assembly includes a hub and a support bearing and a thrust bearing arranged on the hub, the rotor ring is connected to the support bearing through an impeller, and the thrust bearing is arranged at both ends of the support bearing, including a thrust plate connected to the support bearing and a thrust pad configured with the hub.

[0011] In some optional embodiments, the support member is a guide vane symmetrically arranged at both ends of the hub, and the other end of the guide vane is connected to both ends of the conduit.

[0012] In some optional embodiments, the rotor ring, the conduit surface, the support bearing, and the thrust bearing surface are all provided with a protective layer.

[0013] In some optional embodiments, one end of the AC power source is grounded.

[0014] In some optional embodiments, a missing corner is provided on each side of the inner side of the rotor ring, and the corresponding missing corners are two protruding corners of the catheter, and a metal ring is connected to each of the two corners; one end of the AC power supply is connected to the large electrode plate of the catheter, and the other end is connected to the two metal rings respectively.

[0015] In some optional embodiments, a recess is provided on each side of the inner side of the rotor ring, and two protruding pole plates are provided at the corresponding recesses at both ends of the conduit; one end of the AC power supply is connected to the large pole plate of the conduit, and the other end is connected to the two protruding large pole plates.

[0016] In this application, the periodic electric and magnetic fields generated by the pole plates and excitation windings in the conduit drive the rotor ring wound with coils to drive the impeller to rotate, forming a new type of propeller with high power, high efficiency, good stability and high integration, namely a high-power non-contact induction excitation rim propeller for ships.

[0017] The beneficial effects of this application are:

[0018] 1. The existing permanent magnet motor propulsion system cannot be enlarged due to the radial arrangement of the motor stator due to the limitation of the duct size, which also increases the radial size of the duct and increases the resistance. The motor stator excitation winding of the present invention is arranged axially, which fully utilizes the space, makes the duct light and thin, and reduces the resistance. Therefore, it has the advantages of small space occupation, high propulsion efficiency, large thrust, long service life, and easy maintenance. It is particularly suitable for use on ships that require high-power electric propulsion.

[0019] 2. The magnetic field strength limit of the permanent magnet is not high, and the size of the motor is limited, so its power is limited and it cannot be made very large; the present invention uses an excitation winding to generate a magnetic field, and the upper limit of the magnetic field strength is higher. The electric field generates an induced current in the rotor ring, and the electric field strength can be very large. The power can be easily increased by increasing the size of the rotor ring and increasing the number of coils inside the rotor ring. The power upper limit is much higher than that of the original permanent magnet motor thruster.

[0020] 3. This invention is a contactless induction excitation motor. The rotor ring rotates under the action of electric and magnetic fields and does not require any contact with the conduit. The thrust is borne by the hub, thus reducing the number of components and wear. The stability and service life can be greatly improved, which has great advantages in seawater conditions.

[0021] 4. The present invention has only the central hub as a contacting component, and the contacting relative motion components are the most susceptible to failure in propellers. The hub has minimal impact on the overall design, and its modular installation makes repairs simple, thus providing the propeller with a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the local structure of the catheter assembly of the present invention.

[0025] Figure 3 It is a schematic diagram of the partial structure of the wheel hub assembly of the present invention.

[0026] Figure 4 This is a schematic diagram of the rotor ring in the axial direction of the present invention under the combined action of the magnetic field and the electric field.

[0027] Figure 5 This is a schematic diagram of the rotor ring in the axial direction of the present invention under the combined action of the magnetic field and electric field after the direction of the magnetic field and electric field are changed.

[0028] Figure 6 This is a three-dimensional diagram of the installation position of the excitation winding and the U-shaped metal sheet group of the present invention.

[0029] Figure 7 This is a schematic diagram of the overall structure of the Type II high-power non-contact induction-excited rim thruster for ships.

[0030] Figure 8 This is a schematic diagram of the partial structure of the duct assembly of the ship's high-power non-contact induction-excited rim thruster-Type II.

[0031] Figure 9 This is a schematic diagram of the overall structure of the Type III high-power non-contact induction-excited rim thruster for ships.

[0032] Figure 10 This is a schematic diagram of the partial structure of the duct assembly of the ship's high-power non-contact induction-excited rim thruster-Type III.

[0033] In the figure: 1. Conduit; 2. Excitation winding; 3. AC power supply; 4. Ground; 5. Conduit large pole plate; 6. Rotor ring outer pole plate; 7. Rotor ring inner pole plate; 8. U-shaped metal sheet group; 9. Rotor ring internal coil; 10. Guide vane; 11. Hub; 12. Impeller; 13. Thrust plate; 14. Thrust pad; 15. Support bearing; 16. Rotor ring; 17. Metal ring; 18. Protruding pole plate. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0039] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] The features and performance of the present application are further described in detail below with reference to the embodiments.

[0042] Example 1

[0043] like Figure 1 、 Figure 2 、 Figure 3 As shown, this embodiment provides a high-power non-contact induction-excited rim thruster for ships, which is characterized by comprising a duct assembly for fixedly connecting to the hull, a rotor ring assembly arranged in the inner cavity of the duct assembly, and a hub assembly for supporting the rotor ring assembly, wherein the hub assembly is connected to the duct assembly via a support.

[0044] Specifically, the catheter assembly includes a catheter 1, a metal plate assembly for generating a periodic induced electric field is provided in the inner cavity of the catheter 1, and two groups of excitation windings with opposite windings are symmetrically provided on both sides of the inner cavity of the metal plate assembly. The two excitation windings are arranged in the axial direction. In this embodiment, the metal plate assembly includes a U-shaped metal sheet group 8 arranged along the inner cavity wall of the catheter and a catheter large plate 5 arranged along the circumferential direction of the metal sheet group, and the catheter large plate 5 is connected to the AC power supply 3. Figure 6 As shown, the excitation windings 2 are arranged symmetrically, with each set of excitation windings 2 arranged in a circular array. The two excitation windings are respectively abutted against the side walls of the U-shaped metal sheet group. The U-shaped metal sheet group 8, which serves as a soft magnetic material, connects the two sets of excitation windings 2, effectively increasing the magnetic field strength and generating a high-intensity annular cylindrical magnetic field covering the rotor ring area. The metal sheet group can be made of any of silver, copper, gold, aluminum, nickel, and iron, as long as it has good conductivity, similar to the capacitor material. This embodiment uses an iron sheet group as an example.

[0045] The rotor ring includes a rotor ring 16 disposed between two excitation windings and a rotor pole plate assembly configured with the metal pole plate assembly. In this embodiment, the rotor pole plate assembly includes a rotor outer pole plate 6 and a rotor inner pole plate 7 disposed along the outer and inner circumferences of the rotor ring, respectively.

[0046] The large catheter electrode 5 is connected to an AC power supply 3, the other end of which is grounded 4. The large catheter electrode 5 is placed on the inner surface of the catheter facing the outer rotor ring electrode 6. The AC power supply 3 periodically charges and discharges the large catheter electrode 5 to generate a periodic induced electric field, so that the coil 9 inside the rotor ring periodically generates an induced current. The function of the outer rotor ring electrode 6 and the inner rotor ring electrode 7 is to store charge, ensure the continuous stability of the induced current, and improve the intensity of the induced current.

[0047] like Figure 4 As shown, in the axial direction, in a magnetic field perpendicular to the paper and pointing inward, the coil 9 inside the rotor ring generates a radially outward induced current due to the radially outward electric field. From the left-hand rule, it can be seen that the direction of the Ampere force is as shown in the figure, and the torque generated by the Ampere force will cause the rotor ring 16 to rotate counterclockwise.

[0048] like Figure 5 As shown, when the direction of the electric field changes, the direction of the magnetic field also changes. At this point, the electric field is directed radially inward. Due to this change in the electric field, the direction of the induced current in coil 9 inside the rotor ring also changes radially inward. Since the direction of the magnetic field also changes, becoming perpendicular to the paper and outward, the left-hand rule shows that the direction of the Ampere force remains unchanged as shown in the figure. The torque generated by this Ampere force also causes rotor ring 16 to rotate counterclockwise, thus ensuring stable rotation of the impeller driven by the rotor ring.

[0049] The hub assembly includes a hub 11 and a support bearing 15 and a thrust bearing disposed on the hub. The rotor ring 16 is connected to the support bearing 15 via the impeller 12. The thrust bearings are disposed at both ends of the support bearing 15 and include thrust discs 13 connected to the support bearing and thrust pads 14 disposed on the hub. Because the present invention has relatively high power and a magnetic field is generated at both ends of the rotor ring 16, placing thrust bearings at both ends of the rotor ring 16 is clearly inappropriate. Therefore, the present invention incorporates a hub 11 and guide vanes 10 in the middle. The hub assembly includes the hub 11 and a support bearing 15 and thrust bearing disposed on the hub. The rotor ring 16 is connected to the support bearing 15 via the impeller 12. The thrust bearings are disposed at both ends of the support bearing 15 and include thrust discs 13 connected to the support bearing and thrust pads 14 disposed on the hub. The shaft mounted in the hub 11 does not rotate but is used to mount the support bearing 15 and transmit thrust.

[0050] The high-power non-contact induction excitation rim thruster for ships provided by the present invention, when in operation, the energized excitation winding 2 generates a cylindrical magnetic field, the large duct plate 5 is charged to generate an electric field, the internal coil 9 of the rotor ring generates an induced current due to the electric field, and the energized conductor is in turn driven by the Ampere force of the magnetic field to rotate the rotor ring 16; when the large duct plate 5 carries another charge after discharge, the induced current generated by the electric field in the internal coil 9 of the rotor ring also changes direction, but the direction of the magnetic field also changes at this time, so the direction of the Ampere force generated by the magnetic field on the internal coil 9 of the rotor ring remains unchanged, and the rotor ring 16 rotates stably; the rotor ring 16 drives the impeller 12 to pry water and is subjected to the reaction thrust of the water, and the thrust is transmitted to the hub 11 through the thrust bearing in the hub 11, and the hub 11 transmits the thrust to the duct and the hull through the guide vanes 10.

[0051] In this embodiment, the intermediate hub 11 is a modular installation component that can be disassembled and replaced.

[0052] In this embodiment, the surfaces of the rotor ring 16, the conduit 1, the support bearing 15, the thrust bearing-thrust plate 13, and the thrust bearing-thrust pad 14 are all provided with protective layers, and seawater dissipates heat and lubricates through the gaps.

[0053] Example 2

[0054] This embodiment has a structure that is essentially the same as that of Embodiment 1, differing in that a notch is provided on each side of the inner side of the rotor ring 16. The notch corresponds to the two protruding corners of the conduit 1, each of which is connected to a metal ring 17. In this embodiment, one end of the AC power source 3 is connected to the conduit plate 5, while the other end is ungrounded and connected to the two metal rings 17. In this design, the electric field in the region of the rotor ring 16 is no longer generated solely by the conduit plate 5, but rather by both the plate 5 and the metal rings 17, which carry different charges. Consequently, the electric field intensity is greater, the induced current generated by the coil 9 inside the rotor ring is greater, the Ampere force exerted by the magnetic field is greater, and the thrust generated by rotation is greater, resulting in higher power. This design is designated as a high-power non-contact induction-excited rim thruster for ships, Type II.

[0055] Example 3:

[0056] This embodiment has a similar structure to that of Embodiment 1, differing in that a recess is provided on each side of the inner side of the rotor ring 16, and two protruding pole plates 18 are provided at each end of the conduit corresponding to the recess. In this embodiment, one end of the AC power supply is connected to the conduit's large pole plate 5, while the other end is not grounded but connected to the two protruding pole plates 18. In this design, the electric field in the region of the rotor ring 16 is no longer generated solely by the conduit's large pole plate 5, but rather by both the conduit's large pole plate 5 and the protruding pole plates 18, which carry different charges. Consequently, the electric field intensity is greater, the induced current generated by the coil 9 inside the rotor ring is greater, the Ampere force exerted by the magnetic field is greater, and the thrust generated by rotation is greater, resulting in the highest power. This design is designated as a high-power, non-contact, induction-excited rim thruster for ships, Type III.

[0057] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. High-power non-contact induction excitation rim thruster for ships, characterized by: It includes a duct assembly for fixed connection with the hull, a rotor ring assembly arranged in the inner cavity of the duct assembly, and a hub assembly for supporting the rotor ring assembly. The hub assembly is connected to the duct assembly through a support. The duct assembly includes a duct, and a metal pole plate assembly for generating a periodic induced electric field is provided in the inner cavity of the duct. Two groups of excitation windings with opposite windings are symmetrically provided on both sides of the inner cavity of the metal pole plate assembly. The rotor ring includes a rotor ring arranged between the two excitation windings and a rotor pole plate assembly configured with the metal pole plate assembly.

2. The high-power non-contact induction excitation rim thruster for ships according to claim 1, characterized in that: The metal plate assembly comprises a metal sheet group arranged along the inner wall of the catheter and a catheter large plate arranged along the circumferential direction of the metal sheet group. The catheter large plate is connected to an AC power supply.

3. The high-power non-contact induction-excited rim thruster for ships according to claim 2, characterized in that: The metal sheet group is arranged in a U shape, and the two excitation windings are respectively in contact with the two side walls of the U-shaped metal sheet group.

4. The high-power non-contact induction excitation rim thruster for ships according to claim 2 or 3, characterized in that: The rotor pole plate assembly comprises a rotor outer pole plate and a rotor inner pole plate respectively arranged along the outer circumference and inner circumference of the rotor ring.

5. The high-power non-contact induction-excited rim thruster for ships according to claim 1 or 2, characterized in that: The hub assembly includes a hub and a support bearing and a thrust bearing arranged on the hub. The rotor ring is connected to the support bearing through the impeller. The thrust bearing is arranged at both ends of the support bearing and includes a thrust plate connected to the support bearing and a thrust pad configured with the hub.

6. The high-power non-contact induction-excited rim thruster for ships according to claim 5, characterized in that: The support members are guide vanes symmetrically arranged at both ends of the hub, and the other ends of the guide vanes are connected to both ends of the duct.

7. The high-power non-contact induction-excited rim thruster for ships according to claim 5, characterized in that: The rotor ring, the surface of the conduit, the support bearing and the surface of the thrust bearing are all provided with protective layers.

8. The high-power non-contact induction-excited rim thruster for ships according to claim 2, characterized in that: One end of the AC power supply is grounded.

9. The high-power non-contact induction-excitation rim thruster for ships according to claim 2, characterized in that: There is a missing corner on each side of the inner side of the rotor ring, and the corresponding missing corners are the two protruding corners of the catheter, and a metal ring is connected to each of the two corners; one end of the AC power supply is connected to the large electrode plate of the catheter, and the other end is connected to the two metal rings respectively.

10. The high-power non-contact induction-excited rim thruster for ships according to claim 2, characterized in that: There is a depression on each side of the inner side of the rotor ring, and two protruding pole plates are respectively provided at the corresponding depressions at both ends of the conduit; one end of the AC power supply is connected to the conduit large pole plate, and the other end is connected to the two protruding large pole plates.

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