Bearing-free cooling fan
By adopting a bearingless design in the cooling fan, the magnetic interaction between the suction plate and the shaft core is used to solve the problem of easy bearing damage and improve the service life and stability of the fan.
Patent Information
- Application Number
- CN202421597830.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-07-08
AI Technical Summary
The bearings in existing cooling fans are prone to damage, resulting in shortening the fan service life and prone to vibration and noise problems.
The bearing-free design is adopted, and the suspension and rotation of the shaft core is achieved through the magnetic interaction between the suction plate and the shaft core, avoiding the use of the bearing.
It improves the service life of the fan, reduces the failure rate and noise, and the separation design between the fan blade and the shaft core is easy to disassemble and replace.
Smart Images
Figure CN222436638U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of heat dissipation fans, and in particular relates to a bearingless heat dissipation fan. Background Art
[0002] Axial flow fans, centrifugal fans and mixed flow fans are all heat dissipation fans, and mechanical bearings are provided in their structures. Specifically, the structure of each heat dissipation fan includes a stator winding, a magnetic ring, a copper sleeve, a fan shaft, a bearing and a fan blade, wherein a copper sleeve is provided on the inner periphery of the stator winding, the fan shaft is inserted into the copper sleeve and connected to the copper sleeve by a bearing, and a magnetic ring and a fan blade are provided on the outer periphery of the stator winding in sequence, and the magnetic ring and the fan shaft are fixed on the fan blade, and the fan shaft is driven to rotate by the magnetic field between the stator winding and the magnetic ring.
[0003] As the rotating body supporting the fan shaft, the bearing is easily damaged due to fatigue wear, external impact, foreign matter intrusion, high temperature, rust and poor lubrication, so the service life of the bearing is much lower than the life of other parts of the fan. When other parts of the fan function well and the bearing is damaged, the fan will fail, the vibration amplitude will increase, and the noise will increase, resulting in the service life of the fan being reduced by the service life of the bearing. Utility Model Content
[0004] The utility model provides a bearingless heat dissipation fan, which is used to solve the problem that the bearing is easily damaged and limits the service life of the fan.
[0005] In order to solve the above technical problems, the technical solution of the utility model is: a bearingless heat dissipation fan, comprising a fan frame, a shaft core, a suction sheet, a fan blade, and a motor, wherein the suction sheet comprises a first suction sheet fixed to the top of the fan frame, and a second suction sheet fixed to the bottom of the fan frame, the shaft core is located between the first suction sheet and the second suction sheet, and the shaft core and the suction sheet interact with each other to generate magnetic force;
[0006] The motor comprises a stator winding fixedly connected to a fan frame, and a magnetic ring built into the stator winding;
[0007] The fan blade comprises a hub, and the hub cover is arranged on the outer periphery of the stator winding;
[0008] The shaft core passes through the wheel hub and the magnetic ring in sequence and is fixedly connected to both of them.
[0009] Specifically, the suction sheet is a magnet.
[0010] Specifically, the shaft core and the first suction sheet attract each other, and the shaft core and the second suction sheet repel each other.
[0011] Specifically, the shaft core is suspended between the two suction sheets by magnetic force.
[0012] Specifically, the surface of the shaft core facing the suction sheet is a spherical surface, the surface of the suction sheet facing the shaft core is a plane, and the shaft core and the suction sheet are in point contact.
[0013] Specifically, the fan frame includes a front frame and a rear frame, the front frame is provided with a first limiting groove with a notch facing the shaft core, the rear frame is provided with a second limiting groove with a notch facing the shaft core, one end of the shaft core is inserted into the first limiting groove, and the other end is inserted into the second limiting groove.
[0014] Specifically, the first suction sheet is embedded in the bottom of the first limiting groove, and the second suction sheet is embedded in the bottom of the second limiting groove.
[0015] Specifically, the length of the shaft core is greater than the distance between the first limiting groove and the second limiting groove.
[0016] Specifically, the stator winding includes a coil and an iron core, the iron core has a ring body and a T-shaped body protruding from the inner wall of the ring body toward the center of the ring body, and the coil is wound on the T-shaped body.
[0017] Compared with the prior art, the technical solution provided by the utility model has the following advantages:
[0018] 1. The suction sheet and the shaft core are relatively fixed by magnetic attraction, which can maintain the rotation stability of the fan blades without the use of bearings, reduce the failure rate and increase the service life. At the same time, the fan blades and the shaft core are relatively separated, which is convenient for disassembly and replacement;
[0019] 2. The magnetic field between the stator winding and the magnetic ring is set outside the shaft core and inside the wheel hub to ensure the stability of the magnetic field and the stability of the power source of the cooling fan's rotation power;
[0020] 4. Set the magnetic ring between the shaft core and the stator winding to improve the stability of the shaft core rotating around the center line of the cooling fan and reduce polarization. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a structural diagram of a bearingless cooling fan in the utility model;
[0022] Figure 2 It is an exploded view of the bearingless cooling fan in the utility model;
[0023] Figure 3 This is a rear frame structure diagram of the bearingless cooling fan in the utility model;
[0024] Figure 4 It is an axial cross-sectional view of the bearingless cooling fan in the utility model.
[0025] As shown in the figure: 10, fan frame; 11, front frame; 111, front side frame; 112, front bottom frame; 113, front rib; 114, boss; 115, first limiting groove; 12, rear frame; 121, rear side frame; 122, rear bottom frame; 123, column; 124, rear rib; 125, empty groove; 126, wire groove; 127, second limiting groove; 128, flange; 20, shaft core; 21, ring groove; 30, suction plate; 31, first suction plate; 32, second suction plate; 40, fan blade; 41, hub; 42, blade; 50, motor; 51, stator winding; 52, magnetic ring. DETAILED DESCRIPTION
[0026] For ease of understanding, the bearingless heat dissipation fan is described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.
[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0029] like Figure 1 to Figure 2 As shown, a bearingless heat dissipation fan includes a fan frame 10 , a shaft core 20 , a suction sheet 30 , a fan blade 40 , and a motor 50 , wherein the fan blade 40 is located inside the fan frame 10 .
[0030] like Figure 2 and Figure 3As shown, the fan frame 10 includes a front frame 11 and a rear frame 12, the rear frame 12 includes a cylindrical rear frame 121, the rear frame 121 has two ports arranged opposite to each other, a rear bottom frame 122 is arranged at the center of one of the ports, the center of the rear bottom frame 122 protrudes downward to form a column 123, the lower bottom surface of the column 123 is flush with the lower bottom surface of the rear bottom frame 122, four rear ribs 124 are arranged between the rear bottom frame 122 and the rear frame 121, one end of the rear rib 124 is fixedly connected to the rear bottom frame 122, and the other end is fixedly connected to the rear frame 121, the rear bottom frame 122 is provided with an empty slot 125 for placing a PCB board, one of the rear ribs 124 is provided with a wire slot 126 communicated with the empty slot 125, and the other port is covered with the front frame 11.
[0031] like Figure 2 As shown, the front frame 11 includes a front frame 111, a front bottom frame 112 is arranged at the center of the front frame 111, 11 front ribs 113 are arranged between the front bottom frame 112 and the front frame 111, one end of the front rib 113 is fixedly connected to the front frame 111, and the other end is fixedly connected to the front bottom frame 112; the center of the front bottom frame 112 protrudes downward to form a boss 114, and the boss 114 is provided with a first limiting groove 115 with a notch facing the shaft core 20, that is, the notch of the first limiting groove 115 is downward;
[0032] like Figure 2 and Figure 3 As shown, the column 123 is provided with a second limiting groove 127 with a notch facing the shaft core 20, that is, the notch of the second limiting groove 127 is upward, and the notch edge of the second limiting groove 127 protrudes upward to form a flange 128, and the groove depth of the second limiting groove 127 is increased; the setting of the column 123 can increase the groove depth of the second limiting groove 127 to prevent the shaft core 20 from escaping from the second limiting groove 127.
[0033] like Figure 2 and Figure 4 As shown, the suction sheet 30 includes a first suction sheet 31 and a second suction sheet 32, the bottom of the first limiting groove 115 is embedded with the first suction sheet 31 fixed relative to the fan frame 10, and the bottom of the second limiting groove 127 is embedded with the second suction sheet 32 fixed relative to the fan frame 10, one end of the shaft core 20 is inserted into the first limiting groove 115, and is attracted to the suction sheet 30 in the first limiting groove 115, and the other end is inserted into the second limiting groove 127, and is repelled from the suction sheet 30 in the second limiting groove 127, that is, the shaft core 20 is located between the first suction sheet 31 and the second suction sheet 32, and the distance from the notch of the first limiting groove 115 to the notch of the second limiting groove 127 is less than the length of the shaft core 20; wherein the suction sheet 30 is a magnet, and the shaft core 20 is all or partly iron. Preferably, the suction sheet 30 and the shaft core 20 in this embodiment are both magnets, and an annular groove 21 is provided on the shaft core 20.
[0034] like Figure 4 As shown, the motor 50 includes a stator winding 51 fixedly connected to the fan frame 10, and a magnetic ring 52 built into the stator winding 51. Specifically, the stator winding 51 is fixed on the rear bottom frame 122, and the magnetic ring 52 is inserted in the central area of the stator winding 51. There is a gap between the magnetic ring 52 and the stator winding 51 to prevent the relative rotation between the two from generating friction.
[0035] like Figure 2 and Figure 4 As shown, the fan blade 40 includes a hub 41 and blades 42, and a plurality of blades 42 are arranged around the outer periphery of the hub 41. The hub 41 is covered on the outer periphery of the stator winding 51 from top to bottom. The top center of the hub 41 protrudes downward, and a through hole is opened in the top center of the hub 41. The shaft core 20 passes through the through hole of the hub 41 and the hole in the center of the magnetic ring 52 from top to bottom in sequence. The shaft core 20 is fixedly connected to the hub 41, and an annular groove 21 is opened at the connection between the shaft core 20 and the hub 41. The shaft core 20 is also fixedly connected to the magnetic ring 52. When the magnetic ring 52 rotates under the action of the magnetic field, the shaft core 20 and the hub 41 rotate accordingly. When the shaft core 20 rotates, the polarization is reduced.
[0036] The thickness of the second suction sheet 32 is greater than that of the first suction sheet 31. Assuming that the repulsive force between the second suction sheet 32 and the shaft core 20 is F1, the gravity of the shaft core 20 is G, and the attractive force between the first suction sheet 31 and the shaft core 20 is F2, when F1+F2=G, the shaft core 20 is suspended between the two suction sheets 30 by magnetic force; when F1+F2≠G, the shaft core 20 is in contact with the suction sheet 30.
[0037] In some embodiments, Figure 2 and Figure 4 As shown, the surface of the shaft core 20 facing the suction sheet 30 is a spherical surface, and the surface of the suction sheet 30 facing the shaft core 20 is a plane. The shaft core 20 and the suction sheet 30 are in point contact, which reduces the contact area and friction, and the shaft core 20 rotates smoothly.
[0038] In some embodiments, the stator winding 51 includes a coil and an iron core, the iron core has a ring body, and a T-shaped body protruding from the inner wall of the ring body to the center of the ring body. The coil is wound on the T-shaped body, and the T-shaped body used to wind the coil is set on the inner side of the ring body to control the magnetic field range. The magnetic field is located on the inner side of the hub 41 and the outer side of the shaft core 20, thereby improving the stability of the magnetic field.
[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A bearingless cooling fan, characterized in that: The fan comprises a fan frame, an axis core, a suction sheet, a fan blade, and a motor, wherein the suction sheet comprises a first suction sheet fixed to the top of the fan frame, and a second suction sheet fixed to the bottom of the fan frame, the axis core is located between the first suction sheet and the second suction sheet, and the axis core and the suction sheet interact with each other to generate magnetic force; The motor comprises a stator winding fixedly connected to a fan frame, and a magnetic ring built into the stator winding; The fan blade comprises a hub, and the hub cover is arranged on the outer periphery of the stator winding; The shaft core passes through the wheel hub and the magnetic ring in sequence and is fixedly connected to both of them.
2. The bearingless cooling fan according to claim 1, characterized in that: The suction sheet is a magnet.
3. The bearingless cooling fan according to claim 1, characterized in that: The shaft core and the first suction sheet attract each other, and the shaft core and the second suction sheet repel each other.
4. The bearingless cooling fan according to claim 3, characterized in that: The shaft core is suspended between the two suction sheets by magnetic force.
5. The bearingless cooling fan according to claim 3, characterized in that: The surface of the shaft core facing the suction sheet is a spherical surface, the surface of the suction sheet facing the shaft core is a plane, and the shaft core is in point contact with the suction sheet.
6. The bearingless cooling fan according to claim 1, characterized in that: The fan frame includes a front frame and a rear frame, the front frame is provided with a first limiting groove with a notch facing the shaft core, the rear frame is provided with a second limiting groove with a notch facing the shaft core, one end of the shaft core is inserted into the first limiting groove, and the other end is inserted into the second limiting groove.
7. The bearingless cooling fan according to claim 6, characterized in that: The first suction sheet is embedded in the bottom of the first limiting groove, and the second suction sheet is embedded in the bottom of the second limiting groove.
8. The bearingless cooling fan according to claim 6, characterized in that: The length of the shaft core is greater than the distance between the first limiting groove and the second limiting groove.
9. The bearingless cooling fan according to claim 1, characterized in that: The stator winding includes a coil and an iron core. The iron core has a ring body and a T-shaped body protruding from the inner wall of the ring body toward the center of the ring body. The coil is wound on the T-shaped body.