Encapsulated magnetic levitation shaftless propelling pump
By designing a potted magnetic levitation shaftless propulsion pump, the problems of bearing wear and seal aging in traditional underwater propulsion devices have been solved, achieving a compact drive structure with no mechanical contact and improving insulation and corrosion resistance.
Patent Information
- Application Number
- CN202611307406.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-27
- Publication Date
- 2026-11-06
AI Technical Summary
Traditional underwater propulsion devices and circulating pumps suffer from bearing wear, seal aging, leakage, and noise problems. Furthermore, the stator, rotor, and magnetic bearings of magnetic levitation shaftless pumps are distributed, resulting in a large assembly volume and difficulty in ensuring installation accuracy. It is also difficult to reliably encapsulate electrical connections under high-pressure environments.
The pump adopts a potted magnetic levitation shaftless propulsion pump. The magnetic levitation shaftless motor and magnetic levitation bearing assembly are arranged coaxially and nested. The impeller is driven to rotate by the magnetic levitation support force. A static seal structure is formed by sealing resin to avoid mechanical contact and direct contact between liquid and water.
It reduces friction and noise, improves the compactness and assembly precision of the drive structure, enhances insulation and corrosion resistance, and reduces direct contact between the windings, core, and magnets and the liquid.
Smart Images
Figure CN123044505A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of magnetic levitation motors, shaftless propulsion pumps and underwater fluid transport equipment, and particularly relates to a potted magnetic levitation shaftless propulsion pump. Background Technology
[0002] Traditional underwater propulsion systems, circulating pumps, or high-pressure pumps typically use a motor shaft to drive an impeller. This shaft is supported by rolling bearings, sliding bearings, or water-lubricated bearings, and a dynamic seal isolates the motor housing from the external liquid. Such structures are prone to problems such as bearing wear, seal aging, leakage, noise, and efficiency reduction during long-term operation or in high-pressure underwater environments. For applications such as deep-sea equipment, ultra-clean water circulation, liquid cooling, and high-pressure water jet pump heads, dynamic seals and mechanical contact components often become critical weak points limiting reliability and lifespan.
[0003] Magnetic levitation shaftless pumps use electromagnetic force to rotate the impeller in a non-contact state, which can reduce friction and wear and reduce the need for dynamic seals. However, existing solutions often have the problem of dispersed arrangement of stator, rotor, magnetic levitation support and sealing structure, resulting in large assembly volume, difficulty in ensuring the installation accuracy of magnetic bearings, difficulty in completely isolating the windings and magnetic components from the liquid, and difficulty in achieving reliable encapsulation of electrical connections under high pressure. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a potting-type magnetic levitation shaftless propulsion pump, which solves the aforementioned problems.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a potted magnetic levitation shaftless propulsion pump, comprising: a magnetic levitation rotating impeller, disposed within a rotor movable slot and capable of rotating relative to the housing of a magnetic levitation shaftless motor without mechanical contact, wherein the magnetic levitation rotating impeller integrates a permanent magnet of a magnetic levitation shaftless motor rotor and a magnetic levitation shaftless motor rotor core to form an outer rotor magnetic circuit; a magnetic levitation shaftless motor stator assembly for driving the magnetic levitation rotating impeller to rotate; a magnetic levitation bearing assembly for generating an adjustable magnetic levitation support force on the magnetic levitation rotating impeller; the magnetic levitation shaftless motor stator assembly, the magnetic levitation bearing assembly, and the magnetic levitation rotating impeller are arranged coaxially in a radially nested manner; and magnetic levitation shaftless motor stator sealing resin and magnetic levitation bearing sealing resin for forming a statically sealed structure that isolates the magnetic levitation shaftless motor stator assembly and the magnetic levitation bearing assembly from external fluids.
[0006] A further technical solution: The permanent magnets of the magnetic levitation shaftless motor rotor are arranged circumferentially on the magnetic levitation rotating impeller on the magnetic levitation shaftless motor rotor core, and the magnetic levitation shaftless motor rotor core is used to form a rotor-side magnetic guiding channel.
[0007] A further technical solution: The stator core of the magnetic levitation shaftless motor is fixed in the stator fixing slot, the stator winding of the magnetic levitation shaftless motor is wound on the stator core of the magnetic levitation shaftless motor, and the stator sealing resin of the magnetic levitation shaftless motor covers the stator winding and at least part of the stator core of the magnetic levitation shaftless motor.
[0008] A further technical solution: The magnetic bearing winding is wound or sleeved on the magnetic pole part of the magnetic bearing core, and the magnetic bearing permanent magnet is set on one side, both sides or adjacent magnetic circuit positions of the magnetic bearing core to form a basic bias magnetic field between the magnetic bearing core and the magnetic levitation rotating impeller.
[0009] A further technical solution: After a control current is applied to the magnetic bearing winding, the magnetic flux distribution in the magnetic bearing core is changed to generate an adjustable magnetic levitation support force in the radial, axial, or yaw direction on the magnetic levitation rotating impeller.
[0010] A further technical solution: The magnetic bearing sealing resin encapsulates the magnetic bearing permanent magnet, the magnetic bearing winding, and at least part of the magnetic bearing core to isolate the magnetic bearing assembly from external fluids.
[0011] Further technical solution: The magnetic levitation rotating impeller is an annular or cylindrical impeller structure, and its inner side or circumferential area is provided with blades or guide surfaces for propelling fluid.
[0012] A further technical solution: The magnetic levitation bearing assembly is also provided with a magnetic bearing fixing threaded hole, which cooperates with the magnetic bearing threaded hole on the housing of the magnetic levitation shaftless motor to detachably fix the magnetic levitation bearing assembly to the magnetic bearing fixing seat.
[0013] A further technical solution: An annular or U-shaped working gap is formed between the magnetic levitation rotating impeller and the housing of the magnetic levitation shaftless motor. This working gap also serves as a channel for fluid to pass through and for the rotor to make way.
[0014] Beneficial effects This invention provides a potting-type magnetic levitation shaftless propulsion pump, which has the following advantages compared with the prior art: 1. The magnetic levitation impeller does not rely on a mechanical main shaft and contact bearings, which can reduce friction, wear and noise. 2. The stator and rotor impeller are coaxially nested, resulting in a compact drive structure suitable for annular flow channels or limited installation space; 3. The magnetic bearing assembly can be modularly installed in the housing mounting base, which facilitates improving the position of the levitation force and the assembly accuracy; 4. The stator assembly and magnetic bearing assembly are respectively encapsulated with sealing resin, which reduces the direct contact between the windings, iron core and magnets and the liquid, and improves insulation, corrosion resistance and pressure resistance. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of a potting magnetic levitation shaftless propulsion pump provided in an embodiment of the present invention.
[0016] Figure 2 This is a schematic diagram of the stator and magnetic bearing housing 5 provided in an embodiment of the present invention.
[0017] Figure 3 A schematic diagram of a magnetic levitation bearing structure provided for an embodiment of the present invention.
[0018] Figure label annotations: 11 - Magnetic levitation rotating impeller; 12 - Permanent magnet of the rotor of the magnetic levitation shaftless motor; 13 - Iron core of the rotor of the magnetic levitation shaftless motor; 21 - Sealing resin of the magnetic bearing of the magnetic levitation motor; 22 - Permanent magnet of the magnetic bearing; 23 - Magnetic bearing winding; 24 - Iron core of the magnetic bearing; 31 - Stator winding of the magnetic levitation shaftless motor; 32 - Iron core of the stator of the magnetic levitation shaftless motor; 33 - Sealing resin of the stator of the magnetic levitation shaftless motor; 5 - Housing of the magnetic levitation shaftless motor; 6 - Miniature eight-core male and female cable connector; 51 - Threaded hole of the magnetic bearing; 52 - Magnetic bearing mounting seat; 53 - Magnetic bearing mounting slot; 54 - Rotor movable slot; 55 - Stator mounting slot; 56 - Stator cable hole of the housing; 57 - Cable hole of the magnetic bearing in the housing; 58 - Threaded hole of the waterproof socket in the housing cavity. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0020] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.
[0021] like Figure 1 As shown, the potting-type magnetic levitation shaftless propulsion pump of this embodiment includes a magnetic levitation shaftless motor housing 5, a magnetic levitation rotating impeller 11, a magnetic levitation shaftless motor stator assembly, a magnetic levitation bearing assembly, and a miniature eight-core male connector cable 6. The magnetic levitation rotating impeller 11 is disposed in the annular inner region of the housing 5 and maintains a preset working gap with the housing 5, so that the magnetic levitation rotating impeller 11 can rotate relative to the housing 5 without a mechanical main shaft and without contact bearings.
[0022] The magnetic levitation rotating impeller 11 is equipped with a magnetic levitation shaftless motor rotor permanent magnet 12 and a magnetic levitation shaftless motor rotor core 13. The rotor permanent magnet 12 is arranged circumferentially and together with the rotor core 13 forms an outer rotor magnetic circuit. The blades or guide parts of the magnetic levitation rotating impeller 11 are located in the fluid channel. When rotating, it converts electromagnetic torque into fluid propulsion force or pumping pressure.
[0023] The stator assembly of the magnetic levitation shaftless motor includes a stator winding 31, a stator core 32, and a stator sealing resin 33. The stator core 32 is fixed in the stator fixing slot 55 of the housing 5. The stator winding 31 is wound around the slots or corresponding winding portions of the stator core 32. After an alternating current is applied to the stator winding 31, a rotating magnetic field is formed in the air gap between the stator core 32 and the rotor permanent magnet 12, driving the magnetic levitation impeller 11 to rotate continuously. The stator sealing resin 33 fills the area around the stator assembly to fix the stator winding 31 and the stator core 32, and to achieve electrical insulation and liquid isolation.
[0024] The magnetic levitation bearing assembly includes a magnetic bearing sealing resin 21, a magnetic bearing permanent magnet 22, a magnetic bearing winding 23, and a magnetic bearing core 24. The magnetic bearing core 24 is fixed to the magnetic bearing mounting seat 52 of the housing 5 and placed in the magnetic bearing mounting groove 53. The magnetic bearing winding 23 is sleeved on the magnetic bearing core 24. The magnetic bearing permanent magnet 22 is disposed on both sides of the magnetic bearing core 24. The magnetic bearing permanent magnet 22 forms a basic bias magnetic field. After a control current is passed through the magnetic bearing winding 23, the local magnetic flux intensity is changed, so that an adjustable magnetic levitation force is generated between the magnetic bearing core 24 and the magnetic levitation rotating impeller 11, thereby constraining the radial position, eccentricity, or attitude changes of the magnetic levitation rotating impeller 11. The magnetic bearing sealing resin 21 is used to cover the magnetic bearing assembly and isolate the liquid.
[0025] like Figure 2 As shown, the housing 5 is provided with a magnetic bearing threaded hole 51, a magnetic bearing mounting seat 52, a magnetic bearing mounting groove 53, a rotor movable groove 54, a stator mounting groove 55, a housing stator cable hole 56, a housing magnetic bearing cable hole 57, and a housing cavity waterproof socket threaded hole 58. The magnetic bearing threaded hole 51 is used to install and fix the magnetic bearing assembly. The magnetic bearing mounting seat 52 and the magnetic bearing mounting groove 53 are used to position the magnetic bearing core 24, the magnetic bearing winding 23, and the magnetic bearing permanent magnet 22. The rotor movable groove 54 provides rotation clearance space for the magnetic levitation rotating impeller 11. The stator mounting groove 55 is used to install the stator assembly of the magnetic levitation shaftless motor. The housing stator cable hole 56 and the housing magnetic bearing cable hole 57 are used to connect the power lines of the stator and the magnetic bearing. The housing cavity waterproof socket threaded hole 58 is used to install the miniature eight-core male connector female cable 6.
[0026] like Figure 3 As shown, the magnetic levitation bearing assembly can be pre-assembled as an independent module. During assembly, the magnetic bearing winding 23 is installed at the corresponding magnetic pole position of the magnetic bearing core 24, the magnetic bearing permanent magnet 22 is arranged on both sides of the magnetic bearing core 24, and the magnetic bearing fixing threaded hole 25 is used to fix the magnetic bearing assembly on the magnetic bearing fixing seat 52 of the housing 5. This modular structure facilitates the completion of coil winding, magnet positioning and core inspection before assembly, and ensures the relative positional accuracy of the magnetic bearing working surface during the overall assembly.
[0027] During assembly, the stator core 32 and stator winding 31 of the magnetic levitation shaftless motor can be installed first in the stator fixing slot 55 of the housing 5. The stator power line is led out through the stator cable hole 56 of the housing and potted with magnetic levitation shaftless motor stator sealing resin 33. Then, the magnetic bearing core 24, magnetic bearing winding 23 and magnetic bearing permanent magnet 22 are installed into the magnetic bearing fixing slot 53. The magnetic bearing control line is led out through the magnetic bearing cable hole 57 of the housing and potted with magnetic levitation magnetic bearing sealing resin 21. Finally, the magnetic levitation rotating blade with rotor permanent magnet 12 and rotor core 13 is installed. The impeller 11 is inserted into the rotor movable slot 54 to maintain a predetermined working gap with the stator assembly and the magnetic bearing assembly. Finally, the miniature eight-core male connector female cable 6 is installed at the threaded hole 58 of the waterproof socket in the housing cavity and connected to the power line or control line of the stator winding 31 and the magnetic bearing winding 23. Since the magnetic levitation rotating impeller 11 is shaftless and the magnetic levitation bearing assembly and the magnetic levitation shaftless motor stator assembly are assembled independently, the assembly accuracy is effectively improved, and the overall thickness is reduced. At the same time, the independent sealing of the magnetic levitation bearing assembly and the magnetic levitation shaftless motor stator assembly effectively improves the sealing effect.
[0028] During operation, the external controller inputs drive current to the stator winding 31 via the miniature eight-core male connector cable 6. The stator winding 31 interacts with the rotor permanent magnet 12 to generate drive torque, causing the magnetic levitation impeller 11 to rotate and propel the fluid flow. At the same time, the external controller can input levitation control current to the magnetic bearing winding 23, so that the magnetic bearing assembly generates controllable magnetic force on the magnetic levitation impeller 11, thereby suppressing the mechanical contact between the magnetic levitation impeller 11 and the housing 5. Since both the stator assembly and the magnetic bearing assembly are covered with sealing resin, the windings, iron core and magnets are not easily in direct contact with the fluid when the whole machine is running in a liquid environment, thereby improving the pressure resistance, insulation and corrosion resistance.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0030] The term "fixed connection" as used in this application refers to a connection in which parts or components are fixed without any relative movement. This includes both detachable and non-detachable connections.
[0031] (1) Detachable connection: The parts are fixed together by screws, splines, wedges, etc. This type of connection can be disassembled during maintenance without damaging the parts, but the specifications of the connecting parts used must be correct (such as the length of bolts, keys, wedges) and properly tightened; (2) Non-removable connection: mainly refers to welding, riveting and tenon joints, etc. Since forging, sawing or oxygen cutting is required for disassembly during maintenance or replacement, the parts generally cannot be reused. At the same time, attention should be paid to process quality, technical inspection and remedial measures (such as correction, polishing, etc.) when connecting.
[0032] The sliding connection referred to in this application means that a component can slide along a linear trajectory; the hinge referred to in this application means that a component can rotate along an axially constrained path. In some cases, the sliding connection and hinge referred to in this application can also be damped, enabling the component to maintain a desired position.
[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A canned magnetic levitation shaftless propelling pump, characterized in that, include: The magnetic levitation rotating impeller (11) is set in the rotor movable slot (54) and can rotate relative to the magnetic levitation shaftless motor housing (5) without mechanical contact. The magnetic levitation rotating impeller (11) integrates the magnetic levitation shaftless motor rotor permanent magnet (12) and the magnetic levitation shaftless motor rotor core (13) to form the outer rotor magnetic circuit. The magnetic levitation shaftless motor stator assembly is used to drive the magnetic levitation rotating impeller (11) to rotate; the magnetic levitation bearing assembly is used to generate an adjustable magnetic levitation support force for the magnetic levitation rotating impeller (11); and the magnetic levitation shaftless motor stator assembly, the magnetic levitation bearing assembly and the magnetic levitation rotating impeller (11) are arranged coaxially in the radial direction. The stator assembly and the bearing assembly of the magnetic levitation shaftless motor are respectively covered with magnetic levitation shaftless motor stator sealing resin (33) and magnetic levitation bearing sealing resin (21) to form a static sealing structure that is independent of each other and isolated from external fluids. A gap is left between the two static sealing structures for placing the permanent magnet (12) of the magnetic levitation shaftless motor rotor and the iron core (13) of the magnetic levitation shaftless motor rotor.
2. The canned magnetic levitation shaftless propelling pump according to claim 1, characterized in that, The permanent magnet (12) of the magnetic levitation shaftless motor rotor is arranged circumferentially on the magnetic levitation rotating impeller (11) on the magnetic levitation shaftless motor rotor core (13), and the magnetic levitation shaftless motor rotor core (13) is used to form a rotor-side magnetic guiding channel.
3. The canned magnetic levitation shaftless propelling pump according to claim 1, characterized in that, The stator core (32) of the magnetic levitation shaftless motor is fixed in the stator fixing slot (55), the stator winding (31) of the magnetic levitation shaftless motor is wound on the stator core (32), and the stator sealing resin (33) of the magnetic levitation shaftless motor covers the stator winding (31) and at least part of the stator core (32).
4. The canned magnetic levitation shaftless propelling pump according to claim 1, characterized in that, The magnetic bearing winding (23) is wound or sleeved on the magnetic pole part of the magnetic bearing core (24), and the magnetic bearing permanent magnet (22) is set on one side, both sides or adjacent magnetic circuit position of the magnetic bearing core (24) to form a basic bias magnetic field between the magnetic bearing core (24) and the magnetic levitation rotating impeller (11).
5. The canned magnetic levitation shaftless propelling pump according to claim 4, characterized in that After the magnetic bearing winding (23) is supplied with a control current, the magnetic flux distribution in the magnetic bearing core (24) is changed, so as to generate an adjustable magnetic levitation support force in the radial, axial or yaw direction on the magnetic levitation rotating impeller (11).
6. The canned magnetic levitation shaftless propelling pump according to claim 4, characterized in that, The magnetic bearing sealing resin (21) covers the magnetic bearing permanent magnet (22), the magnetic bearing winding (23) and at least part of the magnetic bearing core (24).
7. The canned magnetic levitation shaftless propelling pump according to claim 1, characterized in that, The magnetic levitation rotating impeller (11) is an annular or cylindrical impeller structure, with blades or guide surfaces for propelling fluid on its inner side or circumferential region.
8. The canned magnetic levitation shaftless propelling pump according to claim 1, characterized in that, The magnetic levitation bearing assembly is also provided with a magnetic bearing fixing threaded hole (25), which cooperates with the magnetic bearing threaded hole (51) on the housing (5) of the magnetic levitation shaftless motor to detachably fix the magnetic levitation bearing assembly to the magnetic bearing fixing seat (52).
9. The potting-type magnetic levitation shaftless propulsion pump according to claim 1, characterized in that, An annular or U-shaped working gap is formed between the magnetic levitation rotating impeller (11) and the housing (5) of the magnetic levitation shaftless motor. This working gap also serves as a channel for fluid to pass through and for the rotor to make way.