Radiating fan resistant to magnetic interference

Abstract

The utility model relates to the technical field of cooling fans, and discloses an anti-magnetic interference cooling fan, which comprises a fan main body, the fan main body comprises a housing and fan blades connected to the outer wall of the housing, a stator, a circuit board, a rotor inserted in the inner ring of the stator and a rotor magnetic strip sleeved on the outer ring of the stator are respectively arranged in the housing, and the fan blades are arranged on the outer wall of the housing. The rotor magnetic strip is a rubber magnetic strip; an annular mounting groove is formed in one end of the housing, an electromagnetic shielding ring is mounted in the mounting groove, and a sealing ring for fixing the electromagnetic shielding ring is mounted at one end of the housing in a threaded manner. According to the utility model, through the design of the rotor magnetic strip and the electromagnetic shielding ring arranged in the housing, the rotor magnetic strip is a rubber magnetic strip with weak magnetism, and the electromagnetic shielding ring is made of conductive rubber, so that the sealing effect and the electromagnetic shielding effect on the housing are realized, the influence on the performance of the fan due to the interference with strong magnetism is avoided, and the fan can normally work in a 7000-gauss magnetic field.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation fans, in particular to a heat dissipation fan capable of resisting magnetic interference. Background Art

[0002] The working principle of the cooling fan is based on energy conversion, namely: electrical energy → electromagnetic energy → mechanical energy → kinetic energy.

[0003] After searching, the patent with application number CN201120549025.9 discloses an anti-magnetic interference structure of the induction component of a thin heat dissipation fan, wherein the heat dissipation fan comprises a shell with two side plates arranged at intervals, a stator group and a rotor group built in the shell, wherein the stator group comprises a circuit board set to be located on the inner side of one of the side plates and a magnetic field induction component embedded in a groove provided at a place of the circuit board, and the magnetic field induction component and the circuit board are electrically connected through a spot welding part; the main features of the structure are: a hollow avoidance part is provided at the spot welding part between the side plate corresponding to the magnetic field induction component and the circuit board, so that the spot welding part can protrude and be placed in the hollow avoidance part and can be close to the distance between the circuit board and the side plate; and an anti-magnetic shielding member is further provided at a position on one side of the side plate corresponding to the magnetic field induction component to produce a shielding effect to prevent the induction magnetic field of the magnetic field induction component from being interfered by external factors; thereby, the heat dissipation fan can achieve the practical progress of taking into account the requirements of better thinness and effectively preventing the induction component from being magnetically interfered.

[0004] The existing cooling fan has poor electromagnetic shielding effect and is still subject to a large degree of electromagnetic interference. The cooling fan will cause Hall failure under a 500 Gauss magnetic field, and the fan cannot be used for phase switching, resulting in non-operation. Therefore, we need to propose a cooling fan that is resistant to magnetic interference. Utility Model Content

[0005] The utility model aims to provide a cooling fan that is resistant to magnetic interference. Through the design of rotor magnetic strips and an electromagnetic shielding ring arranged in a cover, the rotor magnetic strips use rubber magnetic strips with weaker magnetism, and the electromagnetic shielding ring uses conductive rubber, which play a sealing and electromagnetic shielding role on the cover, avoiding strong magnetic interference from affecting the fan performance, so that the fan can work normally under a 7000 gauss magnetic field, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solutions: a heat dissipation fan with anti-magnetic interference, comprising a fan body, the fan body comprising a housing, a fan blade connected to the outer wall of the housing, a stator, a circuit board, a rotor plugged into the inner ring of the stator, and a rotor magnetic strip sleeved on the outer ring of the stator are respectively installed inside the housing, and the rotor magnetic strip is set as a rubber magnetic strip;

[0007] One end of the housing is provided with an annular installation groove, an electromagnetic shielding ring is installed inside the installation groove, and a sealing ring for fixing the electromagnetic shielding ring is installed on one end of the housing in a threaded manner.

[0008] Preferably, a stepped groove is provided on the outer wall of one end of the housing, the inner wall of the sealing ring is threadedly connected to the stepped groove, an annular groove is provided on the sealing ring, and the end of the electromagnetic shielding ring abuts inside the groove.

[0009] Preferably, a first gland is installed on the top of the rotor, and a spring is arranged inside the first gland.

[0010] Preferably, a second gland is installed at the bottom of the rotor, and a gasket is installed inside the second gland.

[0011] Preferably, the stator includes a winding frame, an inner ring silicon steel sheet with a notch is installed inside the winding frame, a plurality of T-shaped winding columns are connected to the outer wall of the winding frame, and an outer ring silicon steel sheet is installed on the T-shaped winding columns.

[0012] Preferably, a plurality of connecting columns are further connected to the outer wall of the winding frame, the plurality of connecting columns and the plurality of T-shaped winding columns are arranged alternately, and pin columns are inserted into the connecting columns.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] Through the design of the rotor magnetic strip and the electromagnetic shielding ring arranged in the housing, the rotor magnetic strip uses a rubber magnetic strip with relatively weak magnetism, and the electromagnetic shielding ring adopts conductive rubber, which plays a role in sealing the housing and electromagnetic shielding, avoiding interference with strong magnetism and affecting the performance of the fan, so that the fan can work normally under a 7000 gauss magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an exploded view of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the housing of the present utility model;

[0017] Figure 3 is a schematic structural diagram of the sealing ring of the present utility model;

[0018] Figure 4 is a schematic structural diagram of the stator of the present utility model.

[0019] In the figure: 1. Fan main body; 101. Housing; 12. Installation groove; 13. Step groove; 14. Electromagnetic shielding ring; 15. Sealing ring; 16. Groove; 102. Fan blade; 2. Rotor magnet strip; 3. Spring; 4. Stator; 41. Winding frame; 42. Inner ring silicon steel sheet; 43. T-shaped winding post; 44. Outer ring silicon steel sheet; 45. Connecting post; 46. Pin post; 5. Circuit board; 6. First gland; 7. Rotor; 8. Second gland; 9. Gasket. Specific implementation manner

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] Please refer to Figures 1-4 , the present invention provides a technical solution: a heat dissipation fan with anti-magnetic interference, including a fan main body 1. The fan main body 1 includes a housing 101 and fan blades 102 connected to the outer wall of the housing 101. A plurality of fan blades 102 are arranged at equal intervals in a ring shape. Inside the housing 101 are respectively installed a stator 4, a circuit board 5, a rotor 7 inserted into the inner ring of the stator 4, and a rotor magnet strip 2 sleeved on the outer ring of the stator 4. The rotor magnet strip 2 is made of a rubber magnet strip; through the design of the stator 4 and the rotor 7, windings are wound on the rotor 7, and the current phase and the next commutation are calculated through the back electromotive force of the windings. The rotor magnet strip 2 uses a rubber magnet strip with weak magnetism to avoid interference with strong magnetism and affect performance. The circuit board 5 has no Hall switch, and the commutation is not affected by the magnetic field change.

[0022] The installation and connection methods of the stator 4, the rotor 7, and the circuit board 5 are common technical means in the prior art and are well-known common knowledge to those skilled in the relevant fields, so they will not be elaborated here.

[0023] An annular installation groove 12 is opened at one end of the housing 101. An electromagnetic shielding ring 14 is installed inside the installation groove 12. The electromagnetic shielding ring 14 of the present application is selected as a conductive rubber ring. A sealing ring 15 for fixing the electromagnetic shielding ring 14 is installed on one end of the housing 101 by threading. The sealing ring 15 is used to seal and fix the electromagnetic shielding ring 14 inside the installation groove 12, and the sealing ring 15 abuts against the end of the electromagnetic shielding ring 14 to cause it to deform.

[0024] One end of the outer wall of the housing 101 is provided with a stepped groove 13. The inner wall of the sealing ring 15 is threadedly connected to the stepped groove 13. An annular groove 16 is provided on the sealing ring 15. The end of the electromagnetic shielding ring 14 abuts against the inside of the groove 16. The outer wall of the stepped groove 13 is provided with an external thread, and the inner wall of the groove 16 is provided with an internal thread. Through the cooperation of the internal thread and the external thread, the connection between the sealing ring 15 and the housing 101 is realized.

[0025] A first gland 6 is installed on the top of the rotor 7, and a spring 3 is arranged inside the first gland 6.

[0026] A second gland 8 is installed at the bottom of the rotor 7, and a gasket 9 is installed inside the second gland 8.

[0027] The stator 4 includes a winding frame 41. An inner ring silicon steel sheet 42 with a notch is installed inside the winding frame 41. A plurality of T-shaped winding posts 43 are connected to the outer wall of the winding frame 41, and an outer ring silicon steel sheet 44 is installed on the T-shaped winding posts 43. The T-shaped winding posts 43 are used for winding coils.

[0028] A plurality of connecting posts 45 are further connected to the outer wall of the winding frame 41. The plurality of connecting posts 45 and the plurality of T-shaped winding posts 43 are arranged alternately, and pin posts 46 are inserted on the connecting posts 45.

[0029] During use, the power supply of the fan is connected and the switch is turned on. The coil on the stator 4 is energized to generate a magnetic field, which drives the rotor 7 to rotate under the action of the magnetic field. The rotor 7 drives the fan to rotate through a rotating shaft (not shown in the figure). When the fan is running, the current phase and the next commutation are calculated through the back electromotive force of the winding. The rotor magnetic strip uses a rubber magnetic strip with weak magnetism, and the electromagnetic shielding ring uses conductive rubber, which plays a role in sealing the housing and electromagnetic shielding, avoiding interference with strong magnetism and affecting the performance of the fan. Moreover, the circuit board 5 has no Hall switch, and the commutation is not affected by the magnetic field change.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat dissipation fan resistant to magnetic interference, comprising a fan body (1), characterized in that: The fan body (1) includes a housing (101) and fan blades (102) connected to the outer wall of the housing (101). Inside the housing (101), a stator (4), a circuit board (5), a rotor (7) inserted into the inner ring of the stator (4), and a rotor magnetic strip (2) sleeved on the outer ring of the stator (4) are respectively installed. The rotor magnetic strip (2) is made of rubber magnetic strip; An annular installation groove (12) is formed at one end of the housing (101), and an electromagnetic shielding ring (14) is installed inside the installation groove (12). A sealing ring (15) for fixing the electromagnetic shielding ring (14) is installed on one end of the housing (101) by threading.

2. The heat dissipation fan for anti-magnetic interference according to claim 1, wherein: A stepped groove (13) is formed on the outer wall of one end of the housing (101). The inner wall of the sealing ring (15) is threadedly connected to the stepped groove (13). An annular groove (16) is provided on the sealing ring (15), and the end of the electromagnetic shielding ring (14) abuts against the inside of the groove (16).

3. The heat dissipation fan for anti-magnetic interference according to claim 1, characterized in that: A first gland (6) is installed on the top of the rotor (7), and a spring (3) is arranged inside the first gland (6).

4. The heat dissipation fan for anti-magnetic interference according to claim 1, characterized in that: A second gland (8) is installed on the bottom of the rotor (7), and a gasket (9) is installed inside the second gland (8).

5. The heat dissipation fan for anti-magnetic interference according to claim 1, wherein: The stator (4) includes a winding frame (41). Inside the winding frame (41), an inner ring silicon steel sheet (42) with a notch is installed. A plurality of T-shaped winding posts (43) are connected to the outer wall of the winding frame (41), and an outer ring silicon steel sheet (44) is installed on the T-shaped winding posts (43).

6. The heat dissipation fan for anti-magnetic interference according to claim 5, wherein: A plurality of connecting posts (45) are further connected to the outer wall of the winding frame (41). The plurality of connecting posts (45) and the plurality of T-shaped winding posts (43) are arranged alternately, and pin posts (46) are inserted into the connecting posts (45).

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