Base of cooling fan, cooling fan and base forming process

Abstract

The invention relates to the technical field of cooling fans, in particular to a cooling fan base, a cooling fan and a base forming technology.The cooling fan base comprises the base, the base comprises a base body, a bearing sleeve and an annular magnetic sheet, a mounting hole is formed in the center of the base body, and the bearing sleeve is fixed in the mounting hole in the axial direction of the mounting hole; the bearing sleeve is made of a metal material; an annular groove is further formed in the base body and located in the periphery of the installation hole, and the annular magnetic sheet is fixedly installed in the annular groove and used for being magnetically attracted with a rotor of the cooling fan. The bearing sleeve on the base is changed into the metal bearing sleeve, so that the problem that the central position of the base is prone to plastic deformation and fracture can be solved; and the annular magnetic sheet on the base is used for being magnetically attracted with the rotor of the cooling fan, so that the rotor can be effectively prevented from loosening and falling off.

Description

Technical Field

[0001] This invention relates to the field of cooling fan technology, and in particular to a cooling fan base, a cooling fan, and a base molding process. Background Technology

[0002] Cooling fans, also known as miniature cooling fans, are mainly used in electronic products. Their core function is to dissipate heat from electronic devices by forcing airflow, preventing components from overheating and affecting their performance or lifespan. Due to the limited installation space of miniature cooling fans, their base structure has a thin wall and weak strength, making the center of the base prone to plastic deformation and breakage.

[0003] To this end, an existing patent (publication number: CN103016389A) discloses a bearing housing and a cooling fan using the bearing housing, which includes a bearing housing, a stator and a rotor disposed on the bearing housing. The bearing housing includes a base and a bearing sleeve disposed on the base. The stator is disposed on the outer peripheral surface of the bearing sleeve. A bearing is disposed inside the bearing sleeve. The rotor is rotatably supported on the bearing. The bearing sleeve includes an outer sleeve and an inner sleeve housed inside the outer sleeve. The outer sleeve is made of plastic material, and the inner sleeve is made of metal material. The stator is disposed on the outer peripheral surface of the outer sleeve, and the bearing is housed inside the inner sleeve.

[0004] In use, this cooling fan features a bearing sleeve composed of a plastic outer shell covering a metal inner shell. This design ensures high structural strength while saving costs compared to bearing sleeves made entirely of metal. However, because the rotor shaft and the bearing on the base are slip-fitted, there is a risk that the rotor may detach from the base when the fan's rotor speed exceeds a predetermined value, resulting in significant noise. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a base for a cooling fan, a cooling fan, and a base molding process, which not only effectively avoids the adverse phenomena such as plastic deformation and breakage in the center of the base, but also effectively prevents the rotor from loosening and falling off.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A base for a cooling fan includes a base body, a bearing sleeve, and an annular magnetic plate. The base body has a central mounting hole, and the bearing sleeve is axially mounted and fixed within the mounting hole. The bearing sleeve is made of metal. The base body also has an annular groove located around the mounting hole, and the annular magnetic plate is mounted and fixed within the annular groove. The annular magnetic plate is used to magnetically attract the rotor of the cooling fan.

[0007] Beneficial effects: The bearing sleeve at the center of the base of the cooling fan in this invention is replaced with a metal bearing sleeve, which can effectively solve the risk of plastic deformation and breakage at the center of the base; in addition, the magnetic attraction between the annular magnetic sheet on the base and the rotor of the cooling fan can effectively prevent the rotor from loosening and falling off.

[0008] Furthermore, a first annular boss is provided circumferentially on the inner wall of the mounting hole, and an annular groove is provided on the outer wall of the bearing sleeve corresponding to the position of the first annular boss, the annular groove being adapted to the first annular boss.

[0009] Beneficial effect: Makes the connection between the bearing sleeve and the mounting hole more secure and reliable.

[0010] Furthermore, an inner conical surface is provided on the inner wall of the mounting hole; along the axial direction of the mounting hole, the inner diameter of the inner conical surface gradually increases from bottom to top; the edge of the small diameter port of the inner conical surface is aligned with the upper edge of the inner ring of the first annular boss, and an outer conical surface adapted to the inner conical surface is provided on the outer wall of the bearing sleeve at the position corresponding to the inner conical surface.

[0011] Beneficial effect: It can create a labyrinthine seal between the bearing sleeve and the mounting hole, increasing the difficulty of lubricating oil leakage from the bearing. Furthermore, the base, bearing sleeve, and annular magnetic sheet are integrally formed.

[0012] Beneficial effects: It helps maintain the stability and uniformity of the magnetic field of the ring-shaped magnetic sheet.

[0013] Furthermore, a guide cone surface is provided on the upper end of the outer wall surface of the bearing sleeve, and the guide cone surface gradually increases in size from top to bottom along the axial direction of the bearing sleeve.

[0014] Beneficial effect: Used as a guide ring sleeve on the outer wall of the bearing sleeve.

[0015] Furthermore, a second annular boss is circumferentially provided on the inner wall of the bearing sleeve corresponding to the position of the annular groove.

[0016] Beneficial effect: Used to strengthen the area corresponding to the annular groove on the inner wall of the bearing sleeve.

[0017] A cooling fan includes a rotor and the aforementioned base. The rotor includes fan blades, a shaft, an annular magnet, and a connecting ring. One end of the connecting ring is integrally connected to the shaft, and the other end of the shaft is clearance-fitted with a bearing disposed in a bearing sleeve. The fan blades are fixedly connected to the connecting ring, and the annular magnet is disposed on the surface of the connecting ring facing the annular magnetic sheet.

[0018] Beneficial effect: It can effectively prevent the rotor from loosening and falling off.

[0019] Furthermore, the cooling fan also includes a wear-resistant plate, which is disposed inside the bearing sleeve and located inside the second annular boss. The wear-resistant plate is used to abut against the rotor shaft of the cooling fan, and the part of the shaft that contacts the wear-resistant plate is an arc-shaped surface.

[0020] Beneficial effects: Reduces damage to wear-resistant plates or shaft surfaces caused by stress concentration.

[0021] A molding process for the base of a cooling fan includes the following steps: S1. The bearing sleeves and steel sheets are fed to the corresponding positions on the special carrier by the feeding device. The feeding device includes a frame, vibratory plate A, vibratory plate B, and a three-axis robotic arm. Multiple bearing sleeves and multiple annular magnetic sheets are placed on vibratory plate A and vibratory plate B respectively. The multiple bearing sleeves are arranged in an orderly manner by the vibration of vibratory plate A, and the multiple annular magnetic sheets are arranged in an orderly manner by the vibration of vibratory plate B. The three-axis robotic arm is equipped with a vacuum adsorption gripping part and a vision recognition unit. When gripping the bearing sleeve on vibratory plate A, the vision recognition unit identifies the correct position on the bearing sleeve to be gripped. Then, the vacuum adsorption gripping part adsorbs and grips the bearing sleeve according to the position identified by the vision recognition unit. Finally, the vacuum adsorption gripping part places the gripped bearing sleeve in the corresponding position on the special carrier. When gripping the annular magnetic sheet on vibratory plate B, the vision recognition unit identifies the correct position on the annular magnetic sheet to be gripped. Then, the vacuum adsorption gripping part adsorbs and grips the annular magnetic sheet according to the position identified by the vision recognition unit. Finally, the vacuum adsorption gripping part places the gripped annular magnetic sheet in the corresponding position on the special carrier. S2. The bearing sleeve and steel sheet on the special carrier are picked up by the robotic arm on the injection molding machine and placed in the corresponding position on the injection mold of the injection molding machine. After the injection mold is closed, the plastic raw material is heated, plasticized, filled, pressure held and cooled in the injection mold to obtain the molded base.

[0022] Beneficial Effects: In the integrated base molding process of this invention, multiple bearing sleeves are vibrated and arranged in an orderly manner by a vibrating disc A of the feeding device, and multiple annular magnetic sheets are vibrated and arranged in an orderly manner by a vibrating disc B. A vision recognition unit on a three-axis robotic arm identifies the parts on the bearing sleeves and annular magnetic sheets that need to be gripped. Then, a vacuum adsorption gripping part on the three-axis robotic arm adsorbs and grips the bearing sleeves on vibrating disc A and the annular magnetic sheets on vibrating disc B. Finally, the annular magnetic sheets and bearing sleeves are moved and placed in their corresponding positions on a dedicated carrier, thus completing the loading action of the annular magnetic sheets and bearing sleeves on the dedicated carrier. This feeding process makes the feeding process more continuous and efficient. Furthermore, compared to traditional mechanical gripper gripping methods, the vacuum adsorption gripping method used in this invention allows for gentler contact with the bearing sleeves and annular magnetic sheets, reducing damage to them and avoiding impacts on the performance and appearance quality of the molded base due to improper gripping.

[0023] Furthermore, the vacuum adsorption gripping unit includes a negative pressure channel, a suction nozzle, a buffer spring, and a connecting seat. One end of the negative pressure channel is fixed to the execution end of the three-axis robotic arm, and the other end of the negative pressure channel is connected to the suction nozzle. The connecting seat is hollow inside and is sleeved and fixed on the outer wall of the negative pressure channel. The connecting seat has an air hole communicating with the negative pressure channel. The inner cavity of the connecting seat, the negative pressure channel, and the suction nozzle are connected. The buffer spring is disposed between the suction nozzle and the connecting seat, and the suction nozzle can compress the buffer spring.

[0024] Beneficial effects: It can effectively prevent damage to the bearing sleeve or the annular magnetic sheet.

[0025] In summary, the significant advantages of this invention are as follows: 1. The base of the cooling fan of the present invention can not only avoid plastic deformation and breakage in the center of the base, but also effectively prevent the rotor from loosening and falling off.

[0026] 2. The integrated molding process of the cooling fan base of this invention can effectively avoid affecting the performance and appearance quality of the base after molding due to improper gripping during the feeding of the bearing sleeve and the annular magnetic sheet. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the cooling fan structure of the present invention; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 for Figure 3 Enlarged structural diagram at point C; Figure 5 This is a schematic diagram of the base involved in this embodiment; Figure 6 for Figure 5 Top view; Figure 7 for Figure 6 Sectional view at point BB; Figure 8 This is a schematic diagram of the bearing sleeve involved in this embodiment; Figure 9 This is a top view of the vibratory feeder A, vibratory feeder B, and special carrier on the frame in this embodiment; Figure 10 This is a schematic diagram of the vacuum adsorption gripping part involved in this embodiment.

[0028] Icon labels: 1. Base; 10. Seat body; 101. Mounting hole; 102. First annular boss; 103. Inner conical surface; 11. Bearing sleeve; 110. Annular groove; 111. Outer conical surface; 112. Second annular boss; 113. Bearing; 12. Annular magnetic sheet; 2. Rotor; 20. Fan blade; 21. Rotating shaft; 22. Annular magnet; 23. Connecting ring; 3. Pressure ring; 4. Wear-resistant sheet; 5. Stator; 50. Magnetic ring; 6. Frame; 60. Vibratory plate A; 61. Vibratory plate B; 620. Vacuum adsorption gripping part; 6201. Negative pressure channel; 6202. Suction nozzle; 6203. Buffer spring; 6204. Connecting seat; 6205. Air hole; 63. Special carrier. Detailed Implementation

[0029] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0030] In the description of this invention, it should be understood that the terms "width," "upper," "lower," "front," "rear," "top," and "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0032] Please refer to Figures 1-8 This invention provides a base 1 for a cooling fan, including a base body 10, a bearing sleeve 11, and an annular magnetic plate 12. A mounting hole 101 is provided at the center of the base body 10. The bearing sleeve 11 is axially mounted and fixed within the mounting hole 101, and the bearing sleeve 11 is made of metal. An annular groove is also provided on the base body 10, located around the mounting hole 101. The annular magnetic plate 12 is mounted and fixed within the annular groove, and the annular magnetic plate 12 is used to magnetically attract the rotor 2 of the cooling fan. Therefore, by replacing the bearing sleeve 11 on the cooling fan base 1 with a metal bearing sleeve 11, the risk of plastic deformation and breakage at the center of the base 1 can be effectively solved. Furthermore, since the rotor shaft 21 of the fan and the bearing on the base 1 are slidingly fitted, the magnetic attraction between the annular magnetic plate 12 on the base body 10 and the rotor 2 of the cooling fan can effectively prevent the rotor 2 from loosening and falling off.

[0033] In this embodiment, the base 10, bearing sleeve 11 and annular magnetic sheet 12 are integrally formed, which increases the mechanical strength of the base 1 to a certain extent. In addition, the integral formation of the annular magnetic sheet 12 with the base 10 makes the connection between the annular magnetic sheet 12 and the base 10 more secure, reduces the displacement and deformation of the annular magnetic sheet 12 caused by vibration or external force during the operation of the fan, and helps to maintain the stability and uniformity of the magnetic field of the annular magnetic sheet 12.

[0034] In this embodiment, a first annular boss 102 is circumferentially provided on the inner wall of the mounting hole 101 of the base 1, and the first annular boss 102 is integrally connected to the base 1. Corresponding to the position of the first annular boss 102, an annular groove 110 is formed on the outer wall of the bearing sleeve 11, and the annular groove 110 is adapted to the first annular boss 102. The first annular boss 102 not only positions and installs the bearing sleeve 11, but also strengthens the mounting hole 101. Therefore, the interlocking fit between the annular groove 110 and the first annular boss 102 makes the connection between the bearing sleeve 11 and the mounting hole 101 more secure and reliable. Even when the bearing sleeve 11 is subjected to large vibration or impact loads, it can effectively prevent the bearing sleeve 11 from loosening or falling off.

[0035] In addition, an inner conical surface 103 is provided on the inner wall of the mounting hole 101; along the axial direction of the mounting hole 101, the inner diameter of the inner conical surface 103 gradually increases from bottom to top; the edge of the small-diameter port of the inner conical surface 103 is aligned with the upper edge of the inner ring of the first annular boss 102. Of course, an outer conical surface 111 adapted to the inner conical surface 103 is provided on the outer wall of the bearing sleeve 11 at the position corresponding to the inner conical surface 103. When the bearing sleeve 11 is subjected to axial force in the mounting hole 101, the fit between the bearing sleeve 11 and the mounting hole 101 will be tighter, effectively preventing the bearing sleeve 11 from loosening or falling off under the action of axial force.

[0036] It should be noted that, based on the cooperation between the first annular boss 102 and the annular groove 110, and the cooperation between the inner conical surface 103 and the outer conical surface 111, a labyrinthine sealing structure can be formed between the bearing sleeve 11 and the mounting hole 101. When the lubricating oil on the bearing 113 leaks from the gap between the bearing sleeve 11 and the mounting hole 101, it needs to pass through multiple tortuous channels, which increases the difficulty of lubricating oil leakage and effectively avoids the leakage of lubricating oil from contaminating the electronic components inside the electronic product.

[0037] In this embodiment, a guide cone surface is provided on the upper end of the outer wall surface of the bearing sleeve 11, and the guide cone surface gradually increases in size from top to bottom along the axial direction of the bearing sleeve 11. The guide cone surface here mainly serves a guiding function, guiding the pressure ring 3 of the cooling fan to be sleeved on the bearing sleeve 11.

[0038] In this embodiment, a second annular boss 112 is circumferentially provided on the inner wall of the bearing sleeve 11 corresponding to the position of the annular groove 110. The second annular boss 112 is mainly used for positioning and installing the bearing 113.

[0039] This invention also provides a cooling fan, including a rotor 2, a pressure ring 3, a wear-resistant plate 4, a stator 5, and the aforementioned base 1. The stator 5 is fixed to the base 1, and a magnetic ring 50 is fixed within the stator 5. The rotor 2 includes fan blades 20, a rotating shaft 21, an annular magnet 22, and a connecting ring 23. One end of the connecting ring 23 is integrally connected to the rotating shaft 21, and the other end of the rotating shaft 21 is clearance-fitted with a bearing disposed within a bearing sleeve 11. The fan blades 20 are connected and fixed to the connecting ring 23. The annular magnet 22 is disposed on the surface of the connecting ring 23 facing the annular magnetic plate 12. Naturally, the annular magnet 22 and the alternating magnetic field of the magnetic ring 50 on the stator 5 mutually induce each other. The magnetic ring 50 on the stator 5 (usually a permanent magnet or electromagnet) generates a fixed magnetic field, while the annular magnet 22 on the rotor 2 has its own magnetic field. When the cooling fan is powered on, a rotating magnetic field is generated on the stator 5, thereby driving the rotor 2 to rotate.

[0040] In this embodiment, the wear-resistant plate 4 is disposed within the bearing sleeve 11 and located within the second annular boss 112. The wear-resistant plate 4 is used to abut against the rotating shaft 21 of the rotor 2. The part of the rotating shaft 21 that contacts the wear-resistant plate 4 is an arc-shaped surface. During the operation of the fan, the axial force on the rotating shaft 21 of the rotor 2 can be more evenly distributed to the arc-shaped surface of the rotating shaft 21, thereby effectively avoiding excessive local stress and reducing damage to the wear-resistant plate 4 or the surface of the rotating shaft 21 caused by stress concentration. Reference Figures 9-10 The present invention also provides a molding process for the base of a cooling fan, comprising the following steps: S1. The bearing sleeves 11 and steel sheets are fed to the corresponding positions on the special carrier 63 by the feeding device. The feeding device includes a frame 6, a vibratory feeder A60, a vibratory feeder B61, and a three-axis robotic arm. Multiple bearing sleeves 11 and multiple annular magnetic sheets 12 are placed on vibratory feeder A60 and vibratory feeder B61 respectively. The multiple bearing sleeves 11 are arranged in an orderly manner by the vibration of vibratory feeder A60, and the multiple annular magnetic sheets 12 are arranged in an orderly manner by the vibration of vibratory feeder B61. The execution end of the three-axis robotic arm is equipped with a vacuum adsorption gripping part 620 and a vision recognition unit. When gripping the bearing sleeves 11 on vibratory feeder A60, the vision recognition unit identifies the bearing sleeves. The correct position to be grasped on bearing sleeve 11 is identified by the vacuum adsorption grasping unit 620 according to the position identified by the visual recognition unit. Finally, the vacuum adsorption grasping unit 620 places the bearing sleeve 11 it has grasped into the corresponding position on the special carrier 63. When grasping the annular magnetic sheet 12 on the vibratory plate B61, the correct position to be grasped on the annular magnetic sheet 12 is identified by the visual recognition unit. Then, the vacuum adsorption grasping unit 620 adsorbs and grasps the annular magnetic sheet 12 according to the position identified by the visual recognition unit. Finally, the vacuum adsorption grasping unit 620 places the annular magnetic sheet 12 it has grasped into the corresponding position on the special carrier 63. S2. The bearing sleeve 11 and steel sheet on the special carrier 63 are picked up by the robotic arm on the injection molding machine and placed in the corresponding position on the injection mold of the injection molding machine. After the injection mold is closed, the plastic raw material is heated, plasticized, filled, pressure held and cooled in the injection mold to obtain the molded base 1.

[0041] In the molding process of the base 1 of the cooling fan, refer to Figures 9-10When loading the bearing sleeve 11, multiple bearing sleeves 11 are placed on the vibratory feeder A60. The multiple bearing sleeves 11 on the vibratory feeder A60 are arranged in an orderly manner by the vibration of the vibratory feeder A60. At this time, the three-axis robotic arm moves above the vibratory feeder A60. The vision recognition unit on the three-axis robotic arm identifies the part of the bearing sleeve 11 that needs to be grasped. Then, the vacuum adsorption gripping part 620 on the three-axis robotic arm adsorbs and grasps the bearing sleeve 11 on the vibratory feeder A60. Next, the three-axis robotic arm moves above the special carrier 63. Finally, the vacuum adsorption gripping part 620 places the bearing sleeve 11 it has adsorbed and grasped into the corresponding position on the special carrier 63. Similarly, when feeding the annular magnetic sheet 12, multiple annular magnetic sheets 12 are placed on the vibratory feeder B61. The multiple annular magnetic sheets 12 on the vibratory feeder B61 are arranged in an orderly manner by the vibration of the vibratory feeder B61. At this time, the three-axis robotic arm moves above the vibratory feeder B61. The vision recognition unit on the three-axis robotic arm identifies the part of the annular magnetic sheet 12 that needs to be grasped. Then, the vacuum adsorption gripping part 620 on the three-axis robotic arm adsorbs and grasps the annular magnetic sheet 12 on the vibratory feeder B61. Next, the three-axis robotic arm moves above the special carrier 63. Finally, the vacuum adsorption gripping part 620 places the annular magnetic sheet 12 it has adsorbed and grasped into the corresponding position on the special carrier 63.

[0042] Of course, the vibratory feeder A60, vibratory feeder B61 and the three-axis robotic arm are all mounted on the frame 6. The three-axis robotic arm is located above the vibratory feeder A60 or vibratory feeder B61. The three-axis robotic arm, the vision recognition unit and the vacuum adsorption gripping part 620 are all controlled by the electronic control system of the feeding device. The vision recognition unit is a vision recognition camera. The vision recognition unit and the vacuum adsorption gripping part 620 can rise or fall with the three-axis robotic arm.

[0043] Therefore, it can be seen that the above-mentioned feeding process for the bearing sleeve 11 and the annular magnetic sheet 12 in this embodiment can make the feeding process more continuous and efficient. In addition, compared with the traditional mechanical gripper gripping method, the present invention adopts the vacuum adsorption gripping part 620 to adsorb and grip the bearing sleeve 11 and the annular magnetic sheet 12, which can make more gentle contact with the bearing sleeve 11 and the annular magnetic sheet 12, reduce damage to the bearing sleeve 11 and the annular magnetic sheet 12, and avoid affecting the performance and appearance quality of the molded base 1 due to improper gripping.

[0044] It should be noted that the method of achieving orderly arrangement of materials through vibration using a vibratory feeder is existing technology and will not be elaborated upon here. Furthermore, since the cooling fan is a miniature fan with a small size, its accessories, the bearing sleeve 11 and the annular magnetic plate 12, are also small in size. In this embodiment, the annular magnetic plate 12 has a thickness of 0.675mm and is lightweight. Therefore, the suction nozzle 6202 can easily adsorb and grasp the annular magnetic plate 12, which solves the problem that existing mechanical grippers cannot complete the grasping action of the annular magnetic plate 12 due to its small size.

[0045] In this embodiment, the vacuum adsorption gripping part 620 includes a negative pressure channel 6201, a suction nozzle 6202, a buffer spring 6203, and a connecting seat 6204. One end of the negative pressure channel 6201 is fixed to the execution end of the three-axis robotic arm, and the other end of the negative pressure channel 6201 is connected to the suction nozzle 6202. The connecting seat 6204 is hollow inside, and has an air hole 6205 communicating with the negative pressure channel 6201. The connecting seat 6204 is sleeved and fixed on the outer wall of the negative pressure channel 6201. Of course, the air hole 6205 on the connecting seat 6204 is connected to a vacuum pumping device (not shown). The inner cavity of the connecting seat 6204, the negative pressure channel 6201, and the suction nozzle 6202 are in communication.

[0046] Furthermore, the buffer spring 6203 is disposed between the suction nozzle 6202 and the connecting seat 6204, and the suction nozzle 6202 can compress the buffer spring 6203. That is, it can be understood that when the bearing sleeve 11 or the annular magnetic sheet 12 is attracted to and contacts the suction nozzle 6202, the suction nozzle 6202 compresses the buffer spring 6203, preventing a large impact force when the bearing sleeve 11 or the annular magnetic sheet 12 is attracted to the suction nozzle 6202, thereby playing a buffering role and preventing damage to the bearing sleeve 11 or the annular magnetic sheet 12.

[0047] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A base for a cooling fan, characterized in that, The device includes a base, a bearing sleeve, and an annular magnetic sheet. The base has a mounting hole at its center, and the bearing sleeve is installed and fixed in the mounting hole along the axial direction of the mounting hole. The bearing sleeve is made of metal. The base also has an annular groove located around the mounting hole, and the annular magnetic sheet is installed and fixed in the annular groove. The annular magnetic sheet is used to magnetically attract the rotor of the cooling fan.

2. The base of a cooling fan according to claim 1, characterized in that, A first annular boss is provided circumferentially on the inner wall of the mounting hole, and an annular groove is provided on the outer wall of the bearing sleeve corresponding to the position of the first annular boss. The annular groove is adapted to the first annular boss.

3. The base of a cooling fan according to claim 2, characterized in that, An inner conical surface is also provided on the inner wall of the mounting hole; along the axial direction of the mounting hole, the inner diameter of the inner conical surface gradually increases from bottom to top; the edge of the small diameter port of the inner conical surface is aligned with the upper edge of the inner ring of the first annular boss, and an outer conical surface that matches the inner conical surface is provided on the outer wall of the bearing sleeve at the position corresponding to the inner conical surface.

4. The base of a cooling fan according to claim 1, characterized in that, The base, bearing sleeve, and annular magnetic sheet are integrally formed.

5. The base of a cooling fan according to claim 1, characterized in that, The upper end of the outer wall surface of the bearing sleeve is provided with a guide cone surface, which gradually increases in size from top to bottom along the axial direction of the bearing sleeve.

6. The base of a cooling fan according to claim 2, characterized in that, A second annular boss is circumferentially provided on the inner wall of the bearing sleeve at the position corresponding to the annular groove.

7. A cooling fan, characterized in that, The device includes a rotor and a base as described in any one of claims 1-6. The rotor includes fan blades, a rotating shaft, an annular magnet, and a connecting ring. One end of the connecting ring is integrally connected to the rotating shaft, and the other end of the rotating shaft is in clearance fit with a bearing disposed in a bearing sleeve. The fan blades are connected and fixed to the connecting ring, and the annular magnet is disposed on the surface of the connecting ring facing the annular magnetic sheet.

8. A cooling fan according to claim 7, characterized in that, It also includes a wear-resistant plate, which is disposed inside the bearing sleeve. The wear-resistant plate is used to abut against the rotor shaft of the cooling fan, and the part of the shaft that contacts the wear-resistant plate is an arc-shaped surface.

9. A molding process for the base of a cooling fan as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. The bearing sleeves and steel sheets are fed to the corresponding positions on the special carrier by the feeding device. The feeding device includes a frame, vibratory plate A, vibratory plate B, and a three-axis robotic arm. Multiple bearing sleeves and multiple annular magnetic sheets are placed on vibratory plate A and vibratory plate B respectively. The multiple bearing sleeves are arranged in an orderly manner by the vibration of vibratory plate A, and the multiple annular magnetic sheets are arranged in an orderly manner by the vibration of vibratory plate B. The three-axis robotic arm is equipped with a vacuum adsorption gripping part and a vision recognition unit. When gripping the bearing sleeve on vibratory plate A, the vision recognition unit identifies the correct position on the bearing sleeve to be gripped. Then, the vacuum adsorption gripping part adsorbs and grips the bearing sleeve according to the position identified by the vision recognition unit. Finally, the vacuum adsorption gripping part places the gripped bearing sleeve in the corresponding position on the special carrier. When gripping the annular magnetic sheet on vibratory plate B, the vision recognition unit identifies the correct position on the annular magnetic sheet to be gripped. Then, the vacuum adsorption gripping part adsorbs and grips the annular magnetic sheet according to the position identified by the vision recognition unit. Finally, the vacuum adsorption gripping part places the gripped annular magnetic sheet in the corresponding position on the special carrier. S2. The bearing sleeve and steel sheet on the special carrier are picked up by the robotic arm on the injection molding machine and placed in the corresponding position on the injection mold of the injection molding machine. After the injection mold is closed, the plastic raw material is heated, plasticized, filled, pressure held and cooled in the injection mold to obtain the molded base.

10. The base forming process according to claim 9, characterized in that, The vacuum adsorption gripping unit includes a negative pressure channel, a suction nozzle, a buffer spring, and a connecting seat. One end of the negative pressure channel is fixed to the execution end of the three-axis robotic arm, and the other end of the negative pressure channel is connected to the suction nozzle. The connecting seat is hollow inside and is sleeved and fixed on the outer wall of the negative pressure channel. The connecting seat has an air hole communicating with the negative pressure channel. The inner cavity of the connecting seat, the negative pressure channel, and the suction nozzle are connected. The buffer spring is disposed between the suction nozzle and the connecting seat, and the suction nozzle can compress the buffer spring.

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