Cooling fan with bearing extrusion prevention design

Abstract

The cooling fan comprises a stator and a rotor, the stator is provided with a middle pipe, the rotor comprises fan blades and a shaft core arranged on the inner sides of the fan blades, the shaft core is inserted into a bearing in the middle pipe, the rotor is made to be connected to the stator in a rotating mode, and the outer wall face of the upper end of the middle pipe is provided with a clearance position in the circumferential direction. A certain distance is formed between the lower end part of the middle pipe and the stator. According to the cooling fan with the bearing extrusion prevention design, the clearance position is formed in the upper end portion of the middle pipe, and the clearance position is formed in the distance between the lower end portion of the middle pipe and the stator, so that the fan cannot generate radial inward extrusion force on the bearing in the operation process, the fan can operate normally, and the service life of the bearing is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fan technical field especially is related to a heat dissipation fan of bearing extrusion prevention design. BACKGROUND

[0002] The interference amount of the bearing and the middle pipe of the heat dissipation fan on the market is mainly absorbed by the middle pipe, and after the stator, the radial outward deformation of the middle pipe is limited by the stator. In operation, the shaft core rotates in the bearing, driving the fan blade to rotate. Due to the close contact between the middle pipe and the stator of the existing structure, the end of the bearing will be extruded by the middle pipe, affecting the service life of the bearing and the normal operation of the fan. SUMMARY

[0003] The utility model discloses a heat dissipation fan of bearing extrusion prevention design, sets up the clearance on the upper end of the middle pipe, forms the clearance between the lower end of the middle pipe and the stator, so that the fan will not produce the radial inward extrusion force to the bearing in operation, makes the fan normal operation and prolongs the service life of the bearing.

[0004] In order to achieve the above object, the utility model provides a technical scheme that a heat dissipation fan of bearing extrusion prevention design, including stator and rotor, the stator is equipped with the middle pipe, and the rotor includes the fan blade and the shaft core arranged on the inner side of the fan blade, the shaft core is inserted in the bearing in the middle pipe, and the rotor is rotatably connected to the stator, the outer wall surface of the upper end of the middle pipe is provided with the clearance along the circumference, and the lower end of the middle pipe has a certain distance from the stator.

[0005] The utility model adopts the above technical scheme, sets up the clearance on the upper end of the middle pipe, and the lower end of the middle pipe is not in close contact with the stator, and the distance forms the clearance, so that the middle pipe will not extrude the bearing when the fan is running, the bearing will not extrude the contact surface of the bearing and the shaft core to produce the core phenomenon, the upper end and the lower end of the middle pipe have the clearance simultaneously, so that the stress between the upper end and the lower end of the bearing and the contact surface of the shaft core is uniform, and the core phenomenon will not be produced, which helps to improve the running performance and service life of the fan.

[0006] The heat dissipation fan of bearing extrusion prevention design, the middle part peripheral wall of the middle pipe is inlaid with the rib in the interval, the rib is projected to the outer wall of the middle pipe outside, and the inner wall of the middle pipe is projected inside. The inner wall of the stator is contacted with the outside of the rib, and the inside is contacted with the shaft core, which plays a supporting role in the rotation of the shaft core, and can reduce the extrusion of the stator inner wall to the middle pipe to make the middle pipe deformed.

[0007] The heat dissipation fan with bearing extrusion prevention design has a stator including an outer frame, a wire holder and a coil, a middle tube is integrally formed in the outer frame, the wire holder is sleeved on the outer periphery of the middle tube, the coil is arranged on the wire holder, a magnetic strip is arranged on the fan blade, the fan blade is assembled into the middle tube through a shaft core, and the magnetic strip is sleeved on the outer periphery of the coil.

[0008] The heat dissipation fan with bearing extrusion prevention design has a stator including an outer frame, a wire holder and a coil, a middle tube is integrally formed in the outer frame, the wire holder is sleeved on the outer periphery of the middle tube, the coil is arranged on the wire holder, a magnetic strip is arranged on the fan blade, the fan blade is assembled into the middle tube through a shaft core, and the magnetic strip is sleeved on the outer periphery of the coil.

[0009] The heat dissipation fan with bearing extrusion prevention design has a stator including an outer frame, a wire holder and a coil, a middle tube is integrally formed in the outer frame, the wire holder is sleeved on the outer periphery of the middle tube, the coil is arranged on the wire holder, a magnetic strip is arranged on the fan blade, the fan blade is assembled into the middle tube through a shaft core, and the magnetic strip is sleeved on the outer periphery of the coil.

[0010] The heat dissipation fan with bearing extrusion prevention design has a stator including an outer frame, a wire holder and a coil, a middle tube is integrally formed in the outer frame, the wire holder is sleeved on the outer periphery of the middle tube, the coil is arranged on the wire holder, a magnetic strip is arranged on the fan blade, the fan blade is assembled into the middle tube through a shaft core, and the magnetic strip is sleeved on the outer periphery of the coil.

[0011] The heat dissipation fan with bearing extrusion prevention design has a stator including an outer frame, a wire holder and a coil, a middle tube is integrally formed in the outer frame, the wire holder is sleeved on the outer periphery of the middle tube, the coil is arranged on the wire holder, a magnetic strip is arranged on the fan blade, the fan blade is assembled into the middle tube through a shaft core, and the magnetic strip is sleeved on the outer periphery of the coil.

[0012] The heat dissipation fan with bearing extrusion prevention design has a stator including an outer frame, a wire holder and a coil, a middle tube is integrally formed in the outer frame, the wire holder is sleeved on the outer periphery of the middle tube, the coil is arranged on the wire holder, a magnetic strip is arranged on the fan blade, the fan blade is assembled into the middle tube through a shaft core, and the magnetic strip is sleeved on the outer periphery of the coil. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a perspective structural schematic view of the heat dissipation fan with bearing extrusion prevention design according to an embodiment of the present application;

[0014] Figure 2 is a sectional structural schematic view of the heat dissipation fan with bearing extrusion prevention design according to an embodiment of the present application;

[0015] Figure 3 is an exploded structural schematic view of the heat dissipation fan with bearing extrusion prevention design according to an embodiment of the present application;

[0016] Figure 4 is a structural schematic view of the outer frame of the heat dissipation fan with bearing extrusion prevention design according to an embodiment of the present application;

[0017] Figure 5 is a structure diagram of a bearing extrusion prevention designed cooling fan shaft core of an embodiment of the utility model;

[0018] Figure 6 is Figure 2 is a structure enlarged view of the A position in the middle;

[0019] Figure 7 is Figure 2 is a structure enlarged view of the B position in the middle.

[0020] Explanation of reference numerals: stator 1, middle tube 11, bearing 12, empty position 13, rib 14, outer frame 15, wire holder 16, coil 17, PCBA 18, washer 111, buckle ring 112, iron shell 113, wear-resistant sheet 114, strong magnet 115, rotor 2, fan blade 21, shaft core 22, magnetic strip 23, convex column 221, limit block 222. DETAILED DESCRIPTION

[0021] The utility model will be further explained in connection with the drawings and specific embodiments.

[0022] Referring to Figures 1 to 7 , a bearing extrusion prevention designed cooling fan, comprising a stator 1 and a rotor 2, the stator 1 is equipped with a middle tube 11, the rotor 2 includes a fan blade 21 and a shaft core 22 arranged on the inner side of the fan blade 21, the shaft core 22 is inserted in the bearing 12 in the middle tube 11, and the rotor 2 is rotatably connected to the stator 1, the outer wall surface of the upper end portion of the middle tube 11 is provided with an empty position 13 along the circumference, and there is a certain distance between the lower end portion of the middle tube 11 and the stator 1. When the fan is running, the stator 1 generates a rotating magnetic field after being electrified, drives the rotor 2 to rotate, and the fan blade 21 of the rotor 2 can rotate in the middle tube 11 through the shaft core 22, and the bearing 12 is sleeved on the shaft core 22 to support the rotation of the shaft core 22. The bearing 12 is arranged between the outer wall of the shaft core 22 and the inner wall of the middle tube 11, and since the empty position 13 is arranged along the circumference at the upper end portion of the middle tube 11, there is a certain gap between the upper end portion of the middle tube 11 and the stator 1, so that the stator 1 cannot extrude the upper part of the middle tube 11, so that the middle tube 11 cannot extrude the bearing 12, but the contact surface between the bearing 12 and the shaft core 22 is extruded to generate the phenomenon of retraction. The distance between the lower end portion of the middle tube 11 and the stator 1 also makes the stator 1 not extrude the lower part of the middle tube 11, so that the lower part of the middle tube 11 cannot extrude the bearing 12, and the contact surface between the lower part of the bearing 12 and the shaft core 22 also cannot generate additional extrusion to generate the phenomenon of retraction. The empty position 13 is a circumferential groove opened in the outer wall of the upper end portion of the middle tube 11.

[0023] The middle tube 11 is provided with a plurality of ribs 14 embedded on the middle part of the peripheral wall of the middle tube 11, the ribs 14 protrude outwardly from the outer wall of the middle tube 11 and protrude inwardly from the inner wall of the middle tube 11. The ribs 14 support the bearing 12, and the outer protrusion of the ribs 14 from the outer wall of the middle tube 11 prevents the middle tube 11 from being squeezed and deformed by the stator 1.

[0024] The stator 1 comprises an outer frame 15, a bobbin 16 and a coil 17, the middle tube 11 is integrally formed in the outer frame 15, the bobbin 16 is sleeved on the outer periphery of the middle tube 11, and the coil 17 is arranged on the bobbin 16. The fan blade 21 is provided with a magnetic strip 23, and the fan blade 21 is assembled into the middle tube 11 through the shaft core 22, so that the magnetic strip 23 is sleeved on the outer periphery of the coil 17. The bobbin 16 is provided with a PCBA 18, and the coil 17 is connected with the PCBA 18. The PCBA is a printed circuit board, which is used to connect external power supply and control signal, so that the coil 17 is electrified. After the coil 17 is electrified, a rotating magnetic field is generated, the magnetic strip 23 rotates in the rotating magnetic field, thereby driving the fan blade 21 to rotate, and the shaft core 22 rotates in the middle tube 11.

[0025] Combining Figure 3 As shown in the figure, the shaft core 22 extends a convex column 221 at the bottom end, the bottom end of the convex column 221 is provided with a limiting block 222, the middle tube 11 is provided with a gasket 111 and a clasp 112, the convex column 221 passes through the clasp 112, the outer diameter of the limiting block 222 is greater than the inner diameter of the clasp 112, and the gasket 111 is arranged between the bottom end surface of the shaft core 22 and the clasp 112. The middle tube 11 is provided with an iron shell 113, and the iron shell 113 is provided with a wear-resistant sheet 114 arranged on the bottom of the shaft core 22. The iron shell 113 is provided with a strong magnet 115, and the strong magnet 115 is arranged on the bottom side of the wear-resistant sheet 114.

[0026] The clasp 112 is sleeved on the outside of the convex column 221, the gasket 111 is arranged between the clasp 112 and the shaft core 22 to tightly press the clasp 112, and the clasp 112 can be fixed in position after being arranged in the middle tube 11, thereby limiting the shaft core 22 from axial displacement during rotation. The wear-resistant sheet 114 directly contacts the bottom end of the shaft core 22, and supports and bears the rotation and friction of the end part of the shaft core 22.

[0027] The utility model discloses in the specific implementation, because setting empty space 13 in the upper end part of middle tube 11, the lower end part is not closely attached with stator 1, and in the middle part of middle tube 11 through the support effect of rib 14, make middle tube 11 will not produce serious deformation and extrude the bearing 12 in it. Coil 17 is connected with PCBA 18 line, after switching on the power, produce rotating magnetic field, drive the fan blade 21 that is equipped with magnetic stripe 23 internally rotates, to realize the cooling function of blowing. Fan in operation, bearing 12 is located in middle tube 11, shaft core 22 rotates positioning in middle tube 11 through bearing 12, because the structural design of the middle tube 11 setting empty space 13 of this embodiment, middle tube 11 will not produce additional excessive extrusion to bearing 12, bearing 12 and shaft core 22 contact surface will not be subjected to too much extrusion, to not produce the phenomenon of collection.

[0028] In summary, the utility model has as the content of the specification and the drawing, make actual sample and test after using many times, from the effect of using test, can prove that the utility model can reach its expected purpose, and the practical value is not in doubt. The above-mentioned embodiment is only used to facilitate the illustration of the utility model, and does not limit the utility model in any form, and anyone with ordinary knowledge in the art can make equivalent embodiments by making partial changes or modifications within the scope of the technical features disclosed by the utility model, without departing from the technical features of the utility model, and still belongs to the scope of the technical features of the utility model.

Claims

1. A cooling fan with anti-bearing compression design, comprising a stator (1) and a rotor (2), wherein the stator (1) is provided with a central tube (11), and the rotor (2) includes fan blades (21) and a shaft core (22) disposed inside the fan blades (21), wherein the shaft core (22) is inserted into a bearing (12) inside the central tube (11) and the rotor (2) is rotatably connected to the stator (1), characterized in that: The upper end of the middle tube (11) has a clearance space (13) along the circumferential direction on the outer wall surface, and the lower end of the middle tube (11) has a certain distance from the stator (1).

2. The cooling fan with anti-bearing compression design according to claim 1, characterized in that: Ribs (14) are intermittently embedded on the peripheral wall of the middle tube (11). The ribs (14) protrude from the outer wall of the middle tube (11) on the outside and from the inner wall of the middle tube (11) on the inside.

3. The cooling fan with anti-bearing compression design according to claim 1, characterized in that: The stator (1) includes an outer frame (15), a wire frame (16) and a coil (17). The middle tube (11) is integrally formed in the outer frame (15). The wire frame (16) is fitted around the outer periphery of the middle tube (11). The coil (17) is mounted on the wire frame (16). The fan blade (21) is provided with a magnetic strip (23). The fan blade (21) is assembled into the middle tube (11) through the shaft core (22) so that the magnetic strip (23) is fitted around the outer periphery of the coil (17).

4. The cooling fan with anti-bearing compression design according to claim 3, characterized in that; The bottom end of the shaft core (22) extends with a protrusion (221), and the bottom end of the protrusion (221) is provided with a limiting block (222). The middle tube (11) is provided with a washer (111) and a retaining ring (112). The protrusion (221) passes through the retaining ring (112). The outer diameter of the limiting block (222) is larger than the inner diameter of the retaining ring (112). The washer (111) is located between the bottom end face of the shaft core (22) and the retaining ring (112).

5. The cooling fan with anti-bearing compression design according to claim 3, characterized in that: The bottom of the central tube (11) is provided with an iron shell (113), and the iron shell (113) is provided with a wear-resistant plate (114) placed at the bottom of the shaft core (22).

6. The cooling fan with anti-bearing compression design according to claim 5, characterized in that: A strong magnet (115) is provided in the iron shell (113), and the strong magnet (115) is located on the bottom side of the wear-resistant sheet (114).

7. The cooling fan with anti-bearing compression design according to claim 3, characterized in that: The line frame (16) is provided with a PCBA (18), and the coil (17) is connected to the PCBA (18) by wire.

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