Magnetic levitation fan
By installing a protective support structure inside the magnetic levitation fan, the problem of rotor falling and colliding is solved, achieving collision-free protection and energy-saving effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 广西华磊新材料有限公司
- Filing Date
- 2025-09-17
- Publication Date
- 2026-07-14
AI Technical Summary
In the event of a power outage, the rotor of a magnetic levitation fan is prone to falling and colliding with the stator. Existing electrical buffering methods are highly dependent on this and lack physical and mechanical protection, resulting in high standby power consumption.
A protective support structure, including radial support units and ball bearings, is installed inside the wind turbine body. It only contacts the rotor when it exceeds a predetermined displacement to provide limit protection and avoid mechanical collision.
It achieves rotor collision-free protection in the event of power failure, reduces standby power consumption, and improves the safety and reliability of the equipment.
Smart Images
Figure CN224496838U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of fan technology, and specifically relates to a magnetic levitation fan. Background Technology
[0002] A magnetic levitation fan is a highly efficient fluid machine that uses an active magnetic bearing system to achieve contactless levitation and drive of the rotor. The rotor's levitation relies entirely on the electromagnetic force generated by continuous energization. Therefore, in the event of a sudden power outage, the rapid disappearance of the electromagnetic field will cause the rotor to become unstable and fall under gravity, colliding mechanically with the stator and damaging its core components.
[0003] To address the risk of a rotor falling due to a power outage, existing technologies employ backup capacitors (or supercapacitors). These release electrical energy the instant the power is cut off, attempting to provide a brief levitation force to the rotor and delay its fall. However, this type of capacitor buffering method still relies on the reliability of the electrical system, and its protection window is limited. Once the power is depleted or the electrical circuit fails, the rotor will still inevitably collide. More importantly, this method lacks a final, purely physical and mechanical protection mechanism, and cannot fundamentally prevent the rigid impact problem caused by a power outage or complete failure of the control system.
[0004] Therefore, to avoid the aforementioned risks, traditional magnetic levitation fans must be designed to be constantly powered, resulting in significant standby power consumption during standby or light-load conditions, leading to relatively high overall energy consumption. Meanwhile, constructing a reliable final physical defense system independent of the electrical system is a key issue that needs to be addressed to improve the safety and reliability of magnetic levitation fans. Utility Model Content
[0005] The main purpose of this invention is to provide a magnetic levitation fan that solves the problem in related technologies that the fan needs to be kept energized for a long time to avoid mechanical collision between the rotor and the stator.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows:
[0007] A magnetic levitation fan includes a fan body and a protective support disposed within the fan body. The protective support is arranged at intervals along the circumferential direction of the rotor within the fan body, forming a radial gap relative to the rotor.
[0008] The protective support includes several radial support units, each radial support unit including a support column and ball bearings disposed at the end of the support column facing the rotor.
[0009] The support column includes a pad and a column body. The pad is detachably installed at the end of the column body facing the rotor. The column body is connected to the inner side of the fan body. The ball bearings are embedded in the pad and can roll relative to the pad.
[0010] During normal operation, the ball maintains a predetermined radial clearance with the outer circumferential surface of the rotor, and only contacts the rotor and rolls against it when the rotor experiences a displacement exceeding a predetermined threshold to achieve limit protection.
[0011] Preferably, the pad and the column are radially slidably connected by a guide structure, and a spring is provided between the pad and the column to provide elastic support force for the pad toward the rotor.
[0012] Preferably, the guide structure includes a limiting rod, a connecting plate disposed on the pad, and a mating plate disposed on the column; the connecting plate and the mating plate are respectively provided with through holes for the limiting rod to pass through; the limiting rod passes through the through holes, and the end of the limiting rod is provided with an anti-detachment structure to prevent it from axially dislodging.
[0013] Preferably, the limiting rod includes a sliding rod and a fastener, and the fastener is connected to the sliding rod by a threaded structure provided at both ends of the sliding rod.
[0014] Preferably, the guide structure includes a guide rail disposed on the guide rail column, and the pad is slidably disposed on the guide rail.
[0015] Preferably, a guide limiting mechanism is provided between the pad and the column. The guide limiting mechanism includes a limiting hole and a limiting post. The limiting hole is located at one end of the pad corresponding to the column, and the limiting post is located on the column and forms a limiting fit with the limiting hole.
[0016] Preferably, the spring is sleeved on the corresponding limiting post.
[0017] Preferably, the support column is disposed in the gap between adjacent electromagnetic coils on the outer circumference side of the stator.
[0018] Preferably, multiple balls are provided on the same support column, and the top of the ball's crown forms an approximately arc-shaped support surface to fit the outer circular surface of the rotor.
[0019] Preferably, the end face of the pad corresponding to the rotor has an arc surface structure.
[0020] The working principle and beneficial effects of this utility model are as follows:
[0021] This invention provides an independent mechanical support point for the rotor by setting a dedicated protective support inside the housing that cooperates with the stator and rotor. In the event of a sudden power outage or failure of magnetic levitation, the protective support can reliably support the falling rotor, effectively preventing the rotor from colliding with the stator due to gravity, thereby protecting the core components from damage. Based on this mechanical anti-collision mechanism, this invention does not need to be kept powered on for a long time to avoid the risk of falling, significantly reducing the standby energy consumption of the fan and achieving the purpose of energy saving. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the structure when the volute is used in this embodiment;
[0024] Figure 2 for Figure 1 A sectional view;
[0025] Figure 3 This is a schematic diagram of the structure of the housing and stator in this embodiment;
[0026] Figure 4 This is a schematic diagram of the structure when the stator and rotor are engaged in this embodiment;
[0027] Figure 5 This is a schematic diagram of the limiting post in this embodiment.
[0028] Explanation of icon numbers:
[0029] 1. Stator; 11. Electromagnetic winding; 2. Rotor; 3. Housing; 4. Protective support; 41. Support column; 411. Pad; 412. Column; 4111. Connecting plate; 4121. Mating plate; 42. Ball bearing; 5. Spring; 6. Limiting rod; 61. Slide rod; 62. Threaded structure; 7. Fastener; 8. Guide limiting mechanism; 81. Limiting hole; 82. Limiting post.
[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0031] The embodiments of the utility model are further described in detail below with reference to the accompanying drawings, so that the purpose, technical solution and technical effect of the utility model can be more clearly presented.
[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] like Figure 1 As shown in Figure 4, this embodiment proposes a magnetic levitation fan, including a fan body comprising a stator 1, a rotor 2, a housing 3, and an impeller. The stator 1 is located within the housing 3, while the rotor 2 penetrates the housing 3. A magnetic levitation assembly is provided on the stator 1 to apply axial and / or radial magnetic forces to the rotor 2, causing the rotor 2 to levitate within the working gap. Specifically, the magnetic levitation assembly includes an electromagnetic winding 11 mounted on the stator 1. When energized, the electromagnetic winding 11 generates axial and / or radial magnetic forces to apply to the rotor 2, thereby causing the rotor 2 to levitate within the working gap. An impeller should be provided on the end face of the rotor 2, directly driving gas flow by rotating the impeller. The specific type of impeller should be determined according to the actual application environment of this embodiment, and will not be elaborated further in this embodiment.
[0034] The housing 3 is provided with a protective support 4 for supporting and protecting the rotor 2. The protective support 4 includes a plurality of radial support units arranged at intervals along the circumference of the rotor 2 and fixed to the housing 3. Each radial support unit includes a support column 41 and a ball bearing 42 disposed at the end of the support column 41 facing the rotor 2. One end of the ball bearing 42 is embedded in the end of the support column 41 and can roll relative to the support column 41. The ball bearing 42 is set slightly higher than the stator 1 to ensure the magnetic levitation clearance of the rotor 2 and to ensure protection of the stator 1. In specific operation, the distance between the ball bearing 42 and the rotor 2 is sufficient to meet the levitation requirements of the rotor 2, which will be further explained here. During normal operation, a predetermined radial clearance is maintained between the ball bearing 42 and the outer circumferential surface of the rotor 2. The ball bearing 42 only contacts the rotor 2 and rolls to achieve limit protection when the rotor 2 experiences a displacement exceeding a predetermined threshold. To further improve the fit, multiple ball bearings 42 can be installed on the same support column 41. The tops of the spherical caps of the ball bearings 42 together form an approximately arc-shaped support surface to fit the outer circular surface of the rotor 2. The pad 411 has an arc-shaped end face corresponding to the rotor 2. Thus, even in the event of a power outage, the rotor 2 will not mechanically collide with the stator 1 or the housing 3, thereby eliminating the need for energization when not in operation and achieving energy savings.
[0035] When contact limit occurs, each support column 41 contacts the rotor 2 through the ball bearings 42. The rolling motion of each ball bearing 42 can effectively reduce the friction between the rotor 2 and the protective support 4, thereby reducing the operating loss of this solution and effectively improving the service life of this solution.
[0036] Here, the stator 1 includes a plurality of electromagnetic windings 11, and each support post 41 is located at the gap between adjacent electromagnetic coils on the outer circumference side of the stator 1, that is, each support post 41 is spaced apart from each electromagnetic winding 11, thereby avoiding interference from each support post 41 to the winding operation of the electromagnetic coils in the electromagnetic windings 11 during the assembly process of this embodiment.
[0037] Meanwhile, each support column 41 includes a pad 411 and a column 412. The pad 411 is detachably installed on the end of the column 412 facing the rotor 2. Each ball 42 is set on and embedded in the pad 411. In this way, when each ball 42 is worn or damaged, the operation of this embodiment can be improved by replacing the pad 411, effectively reducing the operation and maintenance cost of this embodiment.
[0038] Specifically, the pad 411 and the column 412 are radially slidably connected by a guide structure, and a spring 5 is provided between the pad 411 and the column 412 to provide elastic support force for the pad 411 toward the rotor 2.
[0039] In one embodiment, the guide structure includes a limiting rod 6, a connecting plate 4111 disposed on the pad 411, and a mating plate 4121 disposed on the column 412; the connecting plate 4111 and the mating plate 4121 are respectively provided with through holes for the limiting rod 6 to pass through; the limiting rod 6 passes through the through holes, and the end of the limiting rod 6 is provided with an anti-detachment structure to prevent it from axially dislodging. The limiting rod 6 includes a sliding rod 61 and a fastener 7, the fastener 7 being connected to the sliding rod 61 by threaded structures 62 disposed at both ends of the sliding rod 61.
[0040] Each pad 411 and each column 412 is provided with a connecting plate 4111 and a mating plate 4121. Each connecting plate 4111 and mating plate 4121 has a through hole, and each through hole is coaxially arranged with a limiting rod 6. The limiting rod 6 passes through the through hole, and its end has an anti-detachment structure to prevent axial disengagement. Through the interaction of the limiting rod 6 with the through holes on the connecting plate 4111 and mating plate 4121, a radial sliding connection and a detachable fixed connection are achieved between the pad 411 and the column 412.
[0041] Furthermore, based on the above scheme, a spring 5 can also be provided between the pad 411 and the column 412. With the presence of each spring 5, when each pad 411 is subjected to force from the rotor 2, it absorbs part of the impact force generated by the rotational motion of the rotor 2 by transmitting the force to the spring 5 and causing it to deform, and provides elastic support force for the pad 411 towards the rotor 2; at the same time, it allows the pad 411 to move radially with the rotor 2 during collision, so that each support column 41 can better buffer the impact force from the rotor 2.
[0042] Furthermore, each support column 41 is evenly distributed around the rotor 2 in a circular pattern, thereby ensuring that no matter at what angle the rotor 2 experiences a failure collision or a large displacement, there is a support column 41 to provide buffer protection and support. The number of each support column 41 in a row should be greater than or equal to four, so that the support columns 41 located on the left and right sides of the rotor 2 can form a symmetrical protection effect on the rotor 2, further improving the reliability of the protective support 4 in supporting the rotor 2 after power failure in this embodiment.
[0043] like Figure 2 , Figure 5 As shown, each limiting rod 6 used to connect the pad 411 and the column 412 includes a sliding rod 61. Both ends of the sliding rod 61 are provided with threaded structures 62. The fastener 7 is connected to the sliding rod 61 through the threaded structures 62 at both ends of the sliding rod 61. The fastener 7 and the limiting rod 6 cooperate to form a horizontal "H"-shaped structure, which restricts the movement direction of each pad 411 to achieve a fixing effect, and allows the pad 411 to slide along the sliding rod 61 to avoid interference between the spring 5, the limiting rod 6, and the fastener 7.
[0044] In the above embodiments, the fastener 7 is preferably a common threaded fastener such as a nut, so that a replacement can be quickly found if the fastener 7 in this embodiment is accidentally lost.
[0045] Preferably, the limiting rod 6 can be threadedly connected to the mating plate 4121 through a threaded structure 62 close to one end of the mating plate 4121. That is, the limiting rod 6 simultaneously engages with the through hole and the fastener 7, so that the limiting rod 6 can be fixed between the pad 411 and the column 412, so as to avoid the limiting rod 6 from axial displacement during the operation of this embodiment, thereby mistakenly causing the pad 411 to move undesirably, effectively improving the operational stability of this embodiment.
[0046] Meanwhile, to ensure that the spring 5 can deform stably in the expected direction, a guide limiting mechanism 8 is provided between the pad 411 and the column 412. Specifically, the guide limiting mechanism 8 includes a limiting hole 81 and a limiting post 82. The limiting hole 81 is located at one end of the pad 411 corresponding to the column 412, and the limiting post 81 is located on the column 412 and forms a limiting fit with the limiting hole 82. The limiting post 82 is slidably connected to the limiting hole 81 one by one, and the spring 5 is sleeved on each limiting post 82 one by one. Due to the physical blocking effect of the limiting post 82 on the spring 5, the lateral bending or tilting of the spring 5 during the deformation process is effectively prevented, thus avoiding the tilting of the pad 411.
[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the patent application of the present utility model. All equivalent changes, equivalent substitutions or modifications made within the technical spirit and principles indicated by the present utility model should be included within the scope of patent protection covered by the present utility model.
Claims
1. A magnetic levitation fan, comprising a fan body and a protective support (4) disposed within the fan body, wherein the protective support (4) is arranged at intervals along the circumferential direction of the rotor (2) within the fan body and forms a radial gap relative to the rotor (2); Its features are: The protective support (4) includes several radial support units, each radial support unit including a support column (41) and ball bearings (42) disposed at one end of the support column (41) facing the rotor (2); The support column (41) includes a pad (411) and a column (412). The pad (411) is detachably installed at the end of the column (412) facing the rotor (2). The column (412) is connected to the inner side of the fan body. The ball (42) is embedded in the pad (411) and can roll relative to the pad (411). During normal operation, the ball (42) maintains a predetermined radial clearance with the outer circumferential surface of the rotor (2), and only contacts the rotor (2) and rolls to achieve limit protection when the rotor (2) experiences a displacement exceeding a predetermined threshold.
2. A magnetic levitation fan according to claim 1, characterized in that: The pad (411) and the column (412) are radially slidably connected by a guide structure, and a spring (5) is provided between the pad (411) and the column (412) to provide elastic support force for the pad (411) toward the rotor (2).
3. A magnetic levitation fan according to claim 2, characterized in that: The guide structure includes a limiting rod (6), a connecting plate (4111) disposed on the pad (411), and a mating plate (4121) disposed on the column (412); the connecting plate (4111) and the mating plate (4121) are respectively provided with through holes for the limiting rod (6) to pass through; the limiting rod (6) passes through the through holes, and the end of the limiting rod (6) is provided with an anti-detachment structure to prevent it from axially detaching.
4. A magnetic levitation fan according to claim 3, characterized in that: The limiting rod (6) includes a slide rod (61) and a fastener (7). The fastener (7) is connected to the slide rod (61) by a threaded structure (62) provided at both ends of the slide rod (61).
5. A magnetic levitation fan according to claim 2, characterized in that: The guide structure includes a guide rail disposed on a guide rail column (412), and the pad (411) is slidably disposed on the guide rail.
6. A magnetic levitation fan according to claim 2, characterized in that: A guide limiting mechanism (8) is provided between the pad (411) and the column (412). The guide limiting mechanism (8) includes a limiting hole (81) and a limiting post (82). The limiting hole (81) is provided at one end of the pad (411) corresponding to the column (412). The limiting post (82) is provided on the column (412) and forms a limiting fit with the limiting hole (81).
7. A magnetic levitation fan according to claim 6, characterized in that: The spring (5) is sleeved on the corresponding limiting post (82).
8. A magnetic levitation fan according to claim 1, characterized in that: The support column (41) is located in the gap between adjacent electromagnetic coils (11) on the outer circumference side of the stator (1).
9. A magnetic levitation fan according to claim 1, characterized in that: Multiple balls (42) are provided on the same pad (411). The top of the ball (42) together form an approximately arc-shaped support surface, which is used to fit the outer circular surface of the rotor (2).
10. A magnetic levitation fan according to claim 1, characterized in that: The pad (411) has an arc-shaped end face corresponding to the rotor (2).