Centrifugal cooling fan

Abstract

The utility model discloses a centrifugal type heat dissipation fan relates to fan technical field, and its pivot is based on oil bearing and anti -runout subassembly setting in the axle pipe, and rotor subassembly surrounds stator subassembly, and the upper portion of stator subassembly is formed with bearing pressure part, and bearing pressure part is butt joint in the upper end of oil bearing, anti -runout subassembly includes the metal cover of inlaying in the bottom of axle pipe, the anti -drop ring of being placed in the upper metal cover and the friction plate and magnet of being placed in the metal cover, one end of pivot is formed with the shaft head, and the local radial contraction of pivot body above the shaft head is formed with the journal, and the anti -drop ring is equipped with on the journal, and the lower end of oil bearing is butt joint in the anti -drop ring, and the shaft head is inserted into the metal cover, and the shaft head contacts the friction plate, and one side of magnet attracts the shaft head, and the other side is adsorbed on the metal cover, the utility model discloses through setting up bearing pressure part and setting up anti -runout subassembly and stabilizing pivot, can effectively reduce the improper noise of fan starting process or working process.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, specifically to a centrifugal cooling fan. Background Technology

[0002] Centrifugal fans are commonly used as cooling fans and are widely used in cooling household appliances, office equipment, and industrial machinery. A centrifugal fan typically includes a base, an impeller, a shaft tube formed on the base, a stator assembly fitted outside the shaft tube, a mounting cylinder formed in the impeller, a rotor assembly arranged along the inner circumference of the mounting cylinder, and a rotating shaft located in the center of the mounting cylinder. The rotating shaft is rotatably mounted in the shaft tube based on an oil-impregnated bearing, and the rotor assembly surrounds the stator assembly. Driven by the stator assembly, the rotor assembly drives the impeller to rotate relative to the base, causing the impeller to draw in air along the axial direction of the rotating shaft and then deflect the air 90° before expelling it. However, the oil-impregnated bearing in the shaft tube and the rotating shaft are prone to slippage, which can easily generate undue noise during the fan's start-up or operation. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art. This utility model provides a centrifugal cooling fan. By setting a bearing pressing part to press against the oil-impregnated bearing and setting an anti-slip component to stabilize the rotating shaft, it can effectively reduce the improper noise generated during the fan start-up or operation.

[0004] This utility model provides a centrifugal cooling fan, including a base, an impeller, a shaft tube formed on the base, a stator assembly sleeved outside the shaft tube, a mounting cylinder formed in the impeller, a rotor assembly arranged along the inner circumferential surface of the mounting cylinder, and a rotating shaft arranged in the center of the mounting cylinder. The rotating shaft is rotatably arranged in the shaft tube based on an oil-impregnated bearing and an anti-slip component. The rotor assembly surrounds the stator assembly. A bearing pressing part is formed on the upper part of the stator assembly, and the bearing pressing part abuts against the upper end of the oil-impregnated bearing.

[0005] The anti-slip assembly includes a metal sleeve embedded in the bottom of the shaft tube, an anti-detachment ring positioned above the metal sleeve, and a friction plate and a magnet positioned inside the metal sleeve, with the friction plate positioned above the magnet. The shaft has a shaft head formed at one end facing the base, and a journal is formed by a partial radial contraction of the shaft body above the shaft head. The anti-detachment ring is sleeved on the journal, with its inner diameter being smaller than the diameter of the shaft and larger than the diameter of the journal. The lower end of the oil-impregnated bearing abuts against the anti-detachment ring. The shaft head extends into the metal sleeve and contacts the friction plate. One side of the magnet attracts the shaft head, and the other side of the magnet adheres to the metal sleeve.

[0006] Specifically, the oil-impregnated bearing is provided with a through hole, and the rotating shaft is rotatably disposed in the through hole;

[0007] The upper end of the oil-impregnated bearing has an oil collection groove recessed around the through hole, and the lower end of the oil-impregnated bearing has an anti-cavity groove recessed around the through hole.

[0008] Specifically, the outer circumferential surface of the oil-impregnated bearing is formed with a plurality of vertical grooves, which are distributed at equal intervals.

[0009] Specifically, the lower outer periphery of the oil-impregnated bearing is radially contracted to form a guide portion.

[0010] Specifically, the stator assembly consists of an insulating support, silicon steel sheets wrapped in the insulating support, and a metal coil wound on the insulating support, with the insulating support sleeved on the shaft tube;

[0011] The upper end of the insulating bracket is formed with the bearing pressing part, and there is a first gap between the bearing pressing part and the upper end of the shaft tube;

[0012] The upper end of the insulating bracket is formed with a first annular wall around the bearing pressing part, and a fixed shaft seat is formed on the inner top of the mounting cylinder. One end of the rotating shaft is embedded in the fixed shaft seat, and the first annular wall surrounds the fixed shaft seat. The upper end of the insulating bracket is also formed with a plurality of first protrusions, which are distributed at equal intervals around the first annular wall. A first winding channel exists between any first protrusion and the first annular wall.

[0013] The lower end of the insulating support is formed with a second annular wall around the geometric center of the insulating support body, and the second annular wall corresponds to the first annular wall; the lower end of the insulating support is formed with a plurality of second protrusions, the plurality of second protrusions are distributed at equal intervals around the second annular wall, the plurality of second protrusions correspond one-to-one with the plurality of first protrusions, and there is a second winding channel between any second protrusion and the second annular wall.

[0014] The first and second winding channels, which are opposite each other, form a winding channel; the metal coil includes several coil windings, and each coil winding is wound in one of the winding channels.

[0015] Specifically, a circuit board is fixed to one end of the plurality of second protrusions away from the plurality of first protrusions by welding with pins. The upper surface of the circuit board is connected to the lower end of the second annular wall, and the circuit board surrounds the shaft tube.

[0016] Specifically, the outer circumferential surface of the shaft tube is formed with a plurality of vertical ribs, which are distributed at equal intervals around the geometric center of the shaft tube body, and the upper ends of the plurality of vertical ribs are located below half the height of the shaft tube body; the stator assembly is axially positioned and mounted on the shaft tube by being blocked by the upper ends of the plurality of vertical ribs.

[0017] The outer circumferential surface of the shaft tube is also formed with a limiting rib, which extends vertically from the top end of the shaft tube to the bottom end of the shaft tube, and the limiting rib is located between two adjacent vertical ribs; the stator assembly is circumferentially positioned and mounted on the shaft tube by the body of the limiting rib.

[0018] Specifically, the inner circumferential surface of the shaft tube is formed with a plurality of first axial grooves, the plurality of first axial grooves being equally spaced around the geometric center of the shaft tube body, the plurality of first axial grooves extending vertically from the top end of the shaft tube to the bottom end of the shaft tube; the plurality of first axial grooves are in contact with the outer circumferential surface of the oil-impregnated bearing.

[0019] The inner circumferential surface of the shaft tube is formed with a plurality of axial ribs, which are distributed at equal intervals around the geometric center of the shaft tube body. The upper ends of the plurality of axial ribs are located below one-quarter of the height of the shaft tube body. The plurality of axial ribs and the plurality of first axial grooves are staggered. A stress relief groove is formed in the center of the inner bottom of the shaft tube.

[0020] The main body of the metal sleeve is embedded in the center of the plurality of axial protruding ribs, and the bottom of the metal sleeve is connected to the stress relief groove; the upper end of the metal sleeve is bent radially to form an annular sleeve edge, the anti-detachment ring is placed on the annular sleeve edge, and there is a second gap between the annular sleeve edge and the upper end of the plurality of axial protruding ribs.

[0021] Specifically, the impeller includes a housing, an annular plate disposed on the edge of the housing, a plurality of first blades disposed on the annular plate, and a connecting ring connecting the plurality of first blades. The diameter of the connecting ring is larger than the diameter of the annular plate. The lower edge of one end of the plurality of first blades is connected to the annular plate, and the upper edge of the other end of the plurality of first blades is connected to the connecting ring. The plurality of first blades are arranged in a circumferential array around the geometric center of the housing, and the plurality of first blades extend inward from the connecting ring and bend along the rotation direction of the impeller.

[0022] Multiple second blades are connected to the connecting ring. The multiple second blades are arranged in a circular array around the geometric center of the impeller housing. The multiple second blades extend inward from the connecting ring and bend along the rotation direction of the impeller. The multiple second blades and the multiple first blades are staggered. The upper edge of the multiple second blades at the end away from the impeller housing is connected to the connecting ring. The end of the multiple second blades near the impeller housing is suspended. The lower edge of the multiple second blades gradually bends upward toward the impeller housing.

[0023] Specifically, the mounting cylinder is located on the side of the wheel housing facing the base, and the outer peripheral surface of the mounting cylinder is connected to the inner surface of the wheel housing based on a plurality of reinforcing ribs; the inner peripheral surface of the mounting cylinder is formed with a plurality of second axial grooves, and the plurality of second axial grooves are equally spaced around the geometric center of the mounting cylinder;

[0024] The rotor assembly includes an iron cylinder and a cylindrical magnet arranged coaxially. The iron cylinder is embedded in the mounting cylinder, and the outer circumferential surface of the iron cylinder is in contact with the plurality of second axial grooves. The cylindrical magnet is embedded in the iron cylinder and surrounds the stator assembly.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] In the centrifugal cooling fan of this invention, a bearing abutment is formed on the upper part of the stator assembly sleeved outside the shaft tube. This bearing abutment can abut against the oil-impregnated bearing inside the shaft tube, preventing the oil-impregnated bearing from moving around, thereby effectively reducing undue noise caused by the movement of the oil-impregnated bearing. Moreover, the oil-impregnated bearing abutted by the bearing abutment can also abut against the anti-disengagement ring of the anti-movement component. The anti-disengagement ring can lock the journal of the rotating shaft, thereby preventing the rotating shaft from moving around significantly. At the same time, the magnet adsorbed in the metal sleeve can attract the shaft head through the friction plate, making the shaft head stick tightly to the friction plate, which can effectively stabilize the rotating shaft and reduce the movement of the rotating shaft. Therefore, it can effectively reduce undue noise caused by the movement of the rotating shaft.

[0027] In summary, this utility model effectively reduces undue noise generated during fan startup or operation by setting a bearing pressing part to hold the oil-impregnated bearing and setting an anti-slip component to stabilize the rotating shaft. Attached Figure Description

[0028] 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 these drawings without creative effort.

[0029] Figure 1 This is a first exploded structural diagram of the centrifugal cooling fan in an embodiment of this utility model;

[0030] Figure 2 This is a second exploded structural diagram of the centrifugal cooling fan in an embodiment of this utility model;

[0031] Figure 3 This is a three-dimensional structural diagram of the centrifugal cooling fan in an embodiment of this utility model;

[0032] Figure 4 This is a partial cross-sectional structural diagram of the centrifugal cooling fan in an embodiment of this utility model;

[0033] Figure 5 yes Figure 4 Enlarged schematic diagram of the structure of region A in the middle;

[0034] Figure 6 This is a schematic diagram of the anti-detachment ring structure in an embodiment of this utility model;

[0035] Figure 7 This is a cross-sectional structural diagram of the oil-impregnated bearing in an embodiment of this utility model;

[0036] Figure 8 This is a three-dimensional structural schematic diagram of the oil-impregnated bearing in an embodiment of this utility model;

[0037] Figure 9 This is a three-dimensional structural diagram of the stator assembly in an embodiment of this utility model;

[0038] Figure 10 This is a three-dimensional structural diagram of the shaft tube in an embodiment of this utility model;

[0039] Figure 11 This is a cross-sectional structural diagram of the shaft tube in an embodiment of this utility model;

[0040] Figure 12 This is a top view of the impeller structure in an embodiment of this utility model;

[0041] Figure 13 This is a cross-sectional structural diagram of the impeller in an embodiment of this utility model;

[0042] Figure 14 This is a three-dimensional structural diagram of the base in an embodiment of this utility model.

[0043] In the attached diagram, 1. Base; 110. Shaft tube; 111. Vertical rib; 112. Limiting rib; 113. First axial groove; 114. Axial rib; 115. Stress relief groove; 120. Receiving groove; 130. Lead wire opening; 140. Mounting hole; 2. Impeller; 201. Reinforcing rib; 210. Mounting cylinder; 211. Shaft base; 212. Second axial groove; 220. Wheel housing; 230. Annular plate; 240. First blade; 250. Connecting ring; 260. Second blade; 3. Stator assembly; 310. Insulating bracket; 311. Bearing pressing part; 312. First annular wall; 313. First protrusion; 314. Second annular wall; 315. Second protrusion; 316. Pin; 317. Circuit board; 320. Silicon steel sheet stack; 330. Metal coil; 4. Rotor assembly; 410. Iron cylinder; 420. Cylindrical magnet; 5. Shaft; 510. Shaft head; 520. Shaft journal; 6. Oil-impregnated bearing; 610. Through-shaft hole; 620. Oil collection groove; 630. Clearance groove; 640. Vertical groove; 650. Guide part; 7. Anti-slip component; 710. Metal sleeve; 711. Annular sleeve edge; 720. Anti-detachment ring; 721. Notch; 730. Friction plate; 740. Magnet. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0045] Figure 1 This diagram shows a first exploded structural schematic of the centrifugal cooling fan in an embodiment of the present invention. Figure 2 This diagram shows a second exploded view of the centrifugal cooling fan in an embodiment of the present invention. Figure 3 This diagram shows a three-dimensional structural schematic of the centrifugal cooling fan in an embodiment of the present invention. Figure 4 This diagram shows a partial cross-sectional view of the centrifugal cooling fan in an embodiment of the present invention. Figure 5 It shows Figure 4 Enlarged schematic diagram of the structure of region A in the middle.

[0046] This utility model provides a centrifugal cooling fan, including a base 1, an impeller 2, a shaft tube 110 formed on the base 1, a stator assembly 3 sleeved on the shaft tube 110, a mounting cylinder 210 formed in the impeller 2, a rotor assembly 4 arranged along the inner circumferential surface of the mounting cylinder 210, and a rotating shaft 5 disposed at the center of the mounting cylinder 210. The rotating shaft 5 is rotatably disposed in the shaft tube 110 based on an oil-impregnated bearing 6 and an anti-slip component 7. The rotor assembly 4 surrounds the stator assembly 3. The upper part of the stator assembly 3 is formed with a bearing pressing part 311, which abuts against the upper end of the oil-impregnated bearing 6. The anti-slip component 7 includes a metal sleeve 710 embedded in the bottom of the shaft tube 110, an anti-detachment ring 720 placed above the metal sleeve 710, and... A friction plate 730 and a magnet 740 are placed inside the metal sleeve 710, with the friction plate 730 positioned above the magnet 740. A shaft head 510 is formed at one end of the shaft 5 facing the base 1, and a journal 520 is formed on the shaft body above the shaft head 510 with a partial radial contraction. An anti-detachment ring 720 is sleeved on the journal 520, with an inner diameter smaller than the diameter of the shaft 5 and larger than the diameter of the journal 520. The lower end of the oil-impregnated bearing 6 abuts against the anti-detachment ring 720. The shaft head 510 extends into the metal sleeve 710 and contacts the friction plate 730. One side of the magnet 740 attracts the shaft head 510, and the other side of the magnet 740 is adsorbed onto the metal sleeve 710.

[0047] In the centrifugal cooling fan of this invention, a bearing pressing part 311 is formed on the upper part of the stator assembly 3, which is sleeved outside the shaft tube 110. The bearing pressing part 311 can press against the oil-impregnated bearing 6 inside the shaft tube 110 to prevent the oil-impregnated bearing 6 from moving, thereby effectively reducing the improper noise caused by the movement of the oil-impregnated bearing 6. Moreover, the oil-impregnated bearing 6 pressed against by the bearing pressing part 311 will also press against the anti-disengagement ring 720 of the anti-movement component 7. The anti-disengagement ring 720 can lock the journal 520 of the rotating shaft 5, thereby preventing the rotating shaft 5 from moving significantly. At the same time, the magnet 740 adsorbed in the metal sleeve 710 can attract the shaft head 510 through the friction plate 730, so that the shaft head 510 is in close contact with the friction plate 730, which can effectively stabilize the rotating shaft 5 and reduce the movement of the rotating shaft 5. Therefore, it can effectively reduce the improper noise caused by the movement of the rotating shaft 5.

[0048] In summary, by setting the bearing pressing part 311 to press against the oil-impregnated bearing 6 and setting the anti-slip component 7 to stabilize the rotating shaft 5, this utility model can effectively reduce the improper noise generated during the fan start-up or operation process.

[0049] Specifically, the anti-detachment ring 720 is made of polyethylene terephthalate (PET), which has good creep resistance, fatigue resistance, friction resistance, and dimensional stability; the friction plate 730 is made of polyetheretherketone (PEEK), which has good mechanical strength and is wear-resistant and fatigue-resistant; the metal sleeve 710 is made of ferritic stainless steel or martensitic stainless steel, which has good ferromagnetism and is durable; the magnet 740 is made of AlNiCo permanent magnet alloy, IronChromiumCo permanent magnet alloy, or Neodymium Iron Boron permanent magnet material, which has good magnetic properties and can effectively attract the metal sleeve 710 and the shaft head 510.

[0050] Figure 6 A schematic diagram of the anti-detachment ring in an embodiment of this utility model is shown. The anti-detachment ring 720 has several notches 721 on its inner side. These notches 721 are evenly distributed around the geometric center of the anti-detachment ring 720, facilitating the smooth passage of the shaft head 510 through the anti-detachment ring 720 when assembling the rotating shaft 5. Furthermore, please refer to... Figure 5 The outer diameter of the anti-detachment ring 720 is equal to the inner diameter of the shaft tube 110. The inner side of the anti-detachment ring 720 will not contact the surface of the journal 520, thus avoiding friction with the rotating journal 520.

[0051] Figure 7 A cross-sectional structural diagram of the oil-impregnated bearing in an embodiment of the present invention is shown. The oil-impregnated bearing 6 is provided with a through-hole 610, and the rotating shaft 5 is rotatably disposed in the through-hole 610. An oil-collecting groove 620 is recessed around the through-hole 610 at the upper end of the oil-impregnated bearing 6, which allows lubricating oil to automatically flow back into the through-hole 610, thus maintaining the lubrication effect between the rotating shaft 5 and the oil-impregnated bearing 6. An anti-cavity groove 630 is recessed around the through-hole 610 at the lower end of the oil-impregnated bearing 6, which helps to reduce the contact friction between the lower end of the oil-impregnated bearing 6 and the rotating shaft 5. Moreover, the oil-collecting groove 620 and the anti-cavity groove 630 can also provide space for the thermal expansion of the oil-impregnated bearing 6, avoiding the rapid contraction of the through-hole 610 due to thermal expansion, which would affect the rotation of the rotating shaft 5, thus improving the reliability of the rotating shaft 5.

[0052] Figure 8 A three-dimensional structural schematic diagram of the oil-impregnated bearing in an embodiment of the present invention is shown. The outer peripheral surface of the oil-impregnated bearing 6 is formed with a plurality of vertical grooves 640. The plurality of vertical grooves 640 are evenly distributed. On the one hand, these vertical grooves 640 can provide space for material deformation and accommodation, which is beneficial to reducing the assembly stress during the assembly process of the oil-impregnated bearing 6. On the other hand, these vertical grooves 640 can serve as heat dissipation channels, which is beneficial to reducing the temperature rise of the oil-impregnated bearing 6 during operation, and at the same time can provide space for the thermal expansion of the oil-impregnated bearing 6.

[0053] Specifically, the vertical groove 640 is provided with 3 to 6 grooves; optionally, the vertical groove 640 can be provided with 3, 4, 5 or 6 grooves.

[0054] In some specific embodiments, please refer to Figure 8 The lower outer periphery of the oil-impregnated bearing 6 is radially tapered to form a guide portion 650, which facilitates the insertion of the oil-impregnated bearing 6 into the shaft tube 110.

[0055] Figure 9 A three-dimensional structural schematic diagram of the stator assembly in an embodiment of this utility model is shown (the metal coil is not shown in the figure). Please refer to the diagram for further details. Figure 4 The stator assembly 3 consists of an insulating support 310, silicon steel sheet laminations 320 wrapped in the insulating support 310, and a metal coil 330 wound on the insulating support 310. The insulating support 310 is sleeved on the shaft tube 110. The insulating support 310 is cast directly on the silicon steel sheet laminations 320, which helps to firmly bond and solidify the loose silicon steel sheet laminations 320 into a solid whole structure. This can greatly enhance the overall mechanical strength, rigidity, and impact and vibration resistance of the stator assembly 3, and can effectively suppress the small vibrations between the silicon steel sheet laminations 320, which helps to reduce the operating noise of the stator assembly 3.

[0056] For details, please refer to Figure 5 The upper end of the insulating bracket 310 is formed with the bearing pressing part 311. There is a first gap between the bearing pressing part 311 and the upper end of the shaft tube 110, which can prevent the upper end of the shaft tube 110 from pressing against the bearing pressing part 311, so that the bearing pressing part 311 can fully press against the upper end of the oil-impregnated bearing 6.

[0057] For further details, please refer to Figure 5 The upper end of the insulating bracket 310 is formed with a first annular wall 312 around the bearing pressing part 311, and the inner top of the mounting cylinder 210 is formed with a fixed shaft seat 211. One end of the rotating shaft 5 is embedded in the fixed shaft seat 211. The first annular wall 312 surrounds the fixed shaft seat 211, which can effectively block dust and other impurities from entering the shaft tube 110, and at the same time help prevent lubricating oil from running out of the shaft tube 110. Moreover, the surface between the first annular wall 312 and the fixed shaft seat 211 can be coated with an oil-blocking agent to form an oil-repellent film, which helps the lubricating oil to flow back into the shaft tube 110.

[0058] For further details, please refer to Figure 4 and Figure 9The upper end of the insulating support 310 is further formed with a plurality of first protrusions 313, which are evenly distributed around the first annular wall 312, and a first winding channel exists between any first protrusion 313 and the first annular wall 312; the lower end of the insulating support 310 is formed with a second annular wall 314 around the geometric center of the insulating support 310 body, and the second annular wall 314 corresponds to the first annular wall 312; the lower end of the insulating support 310 is formed with a plurality of second protrusions 315, which are evenly distributed around the second annular wall 314, and the plurality of second protrusions 315 correspond one-to-one with the plurality of first protrusions 313, and a second winding channel exists between any second protrusion 315 and the second annular wall 314; the upper and lower opposing first winding channels and second winding channels form a winding channel; the metal coil 330 includes a plurality of coil windings, and each coil winding is wound in one of the winding channels.

[0059] In some specific embodiments, please refer to Figure 4 The circuit board 317 is welded and fixed to one end of the plurality of second protrusions 315 away from the plurality of first protrusions 313 based on the pin 316. The upper surface of the circuit board 317 is connected to the lower end of the second annular wall 314. The circuit board 317 surrounds the shaft tube 110. The second annular wall 314, the second protrusions 315 and the pin 316 cooperate with each other to effectively and stably install the circuit board 317.

[0060] Furthermore, on the side of the circuit board 317 away from the first protrusion 313, there are electronic components such as photoelectric sensors, resistors, and capacitors, which are used to control the operation of the stator assembly 3, and then drive the rotor assembly 4 to drive the impeller 2 to rotate.

[0061] Figure 10 The diagram shows a three-dimensional structural schematic of the shaft tube 110 according to an embodiment of the present invention. The outer circumferential surface of the shaft tube 110 is formed with a plurality of vertical ribs 111. These vertical ribs 111 are evenly distributed around the geometric center of the shaft tube 110 body, and the upper ends of the vertical ribs 111 are located below half the height of the shaft tube 110 body. (See also...) Figure 5 and Figure 10 The stator assembly 3 is axially positioned and mounted on the shaft tube 110 by the upper ends of the plurality of vertical ribs 111. The upper ends of the vertical ribs 111 can abut against a certain part inside the stator assembly 3, such as the lower inner edge of the silicon steel sheet lamination 320 or the inner flange of the insulating bracket 310, thereby restricting the stator assembly 3 to be mounted at a specific height on the shaft tube 110. This ensures that the bearing pressing part 311 at the upper part of the stator assembly 3 can properly abut against the oil-impregnated bearing 6, preventing the oil-impregnated bearing 6 from moving.

[0062] For further details, please refer to Figure 10 The outer circumferential surface of the shaft tube 110 is also formed with a limiting rib 112. The limiting rib 112 extends vertically from the top end of the shaft tube 110 to the bottom end of the shaft tube 110. The limiting rib 112 is located between two adjacent vertical ribs 111. The stator assembly 3 is circumferentially positioned and installed on the shaft tube 110 by the body of the limiting rib 112. The limiting rib 112 can not only guide the stator assembly 3 to be sleeved on the shaft tube 110, but also prevent the stator assembly 3 sleeved on the shaft tube 110 from rotating, which is beneficial to improving the assembly stability of the stator assembly 3.

[0063] Figure 11 A cross-sectional view of the shaft tube 110 in an embodiment of the present invention is shown. The inner circumferential surface of the shaft tube 110 is formed with a plurality of first axial grooves 113. These first axial grooves 113 are evenly distributed around the geometric center of the shaft tube 110 body and extend vertically from the top end of the shaft tube 110 to the bottom end. Please refer to [link to previous document]. Figure 5 and Figure 11 The plurality of first axial grooves 113 are in contact with the outer peripheral surface of the oil-impregnated bearing 6. On the one hand, these first axial grooves 113 can also provide space for material deformation and accommodation, which helps to reduce the assembly stress during the assembly process of the oil-impregnated bearing 6. On the other hand, these first axial grooves 113 can also serve as heat dissipation channels, which helps to reduce the temperature rise of the oil-impregnated bearing 6 during operation, and at the same time can provide buffer space for the thermal expansion of the oil-impregnated bearing 6. Optionally, the number of first axial grooves 113 can be 3, 4, 5 or 6.

[0064] For details, please refer to Figure 5 and Figure 11 The inner circumferential surface of the shaft tube 110 is formed with a plurality of axial ribs 114, which are evenly distributed around the geometric center of the shaft tube 110 body. The upper ends of the plurality of axial ribs 114 are located below one-quarter of the height of the shaft tube 110 body. The plurality of axial ribs 114 and the plurality of first axial grooves 113 are staggered. A stress relief groove 115 is formed in the center of the inner bottom of the shaft tube 110. The main body of the metal sleeve 710 is embedded in the center of the plurality of axial ribs 114, and the bottom of the metal sleeve 710 is in contact with the stress relief groove 115. These axial ribs 114 can firmly hold the metal sleeve 710, so that the metal sleeve 710 is stably embedded in the inner bottom of the shaft tube 110. Moreover, the spacing between these axial ribs 114 and the presence of the stress relief groove 115 can provide space for material deformation and accommodation, which helps to reduce the assembly stress during the assembly process of the metal sleeve 710, and can provide a buffer space for thermal expansion of the metal sleeve 710 during operation.

[0065] For further details, please refer to Figure 5 The upper end of the metal sleeve 710 is bent radially to form an annular sleeve edge 711. The anti-detachment ring 720 is placed on the annular sleeve edge 711, and a second gap exists between the annular sleeve edge 711 and the upper ends of the plurality of axial protrusions 114. The annular sleeve edge 711 can provide effective support for the anti-detachment ring 720, thereby providing a foundation for the oil-impregnated bearing 6 to abut against the anti-detachment ring 720; the existence of the second gap is beneficial for heat dissipation of the metal sleeve 710.

[0066] Figure 12 This diagram shows a top view of the impeller in an embodiment of the present invention. Figure 13 A cross-sectional structural diagram of the impeller in an embodiment of this utility model is shown below. Please refer to the diagram for further details. Figure 3 The impeller 2 includes a housing 220, an annular plate 230 disposed on the edge of the housing 220, a plurality of first blades 240 disposed on the annular plate 230, and a connecting ring 250 connecting the plurality of first blades 240. The diameter of the connecting ring 250 is larger than the diameter of the annular plate 230. The lower edge of one end of the plurality of first blades 240 is connected to the annular plate 230, and the upper edge of the other end of the plurality of first blades 240 is connected to the connecting ring 250. The plurality of first blades 240 are arranged in a circumferential array around the geometric center of the housing 220. The plurality of first blades 240 extend inward from the connecting ring 250 and bend along the rotation direction of the impeller 2. The impeller 2 has a lightweight and stable structure and can effectively draw in air along the axial direction of the rotating shaft 5 and then deflect the air by 90° before discharging it.

[0067] For details, please refer to Figure 3 , Figure 12 and Figure 13 The connecting ring 250 is connected to a plurality of second blades 260, which are arranged in a circular array around the geometric center of the impeller housing 220. The second blades 260 extend inward from the connecting ring 250 and bend along the rotation direction of the impeller 2. The second blades 260 and the first blades 240 are staggered. The upper edge of the second blade 260 at the end furthest from the impeller housing 220 is connected to the connecting ring 250, while the end of the second blade 260 closest to the impeller housing 220 is suspended. The lower edge of the second blade 260 gradually bends upward toward the impeller housing 220. Each second blade 260 effectively divides the airflow vortex between two adjacent first blades 240, significantly reducing wind noise.

[0068] For further details, please refer to Figure 13The sidewall of the wheel housing 220 smoothly transitions to the annular plate 230, which helps to reduce wind noise when deflecting air.

[0069] In some specific embodiments, please refer to Figure 2 and Figure 13 The mounting cylinder 210 is located on the side of the wheel housing 220 facing the base 1. The outer peripheral surface of the mounting cylinder 210 is connected to the inner surface of the wheel housing 220 based on a plurality of reinforcing ribs 201. The inner peripheral surface of the mounting cylinder 210 is formed with a plurality of second axial grooves 212, which are evenly distributed around the geometric center of the mounting cylinder 210. Please refer to [link / reference]. Figure 4 The rotor assembly 4 includes a coaxially arranged iron cylinder 410 and a cylindrical magnet 420. The iron cylinder 410 is embedded in the mounting cylinder 210, and its outer circumferential surface is in contact with the plurality of second axial grooves 212. The cylindrical magnet 420 is embedded in the iron cylinder 410 and surrounds the stator assembly 3. These second axial grooves 212 provide space for material deformation and accommodation, which helps to reduce the assembly stress during the assembly process of the rotor assembly 4. In addition, if the iron cylinder 410 needs to be fixed in the mounting cylinder 210 with adhesive, these second axial grooves 212 can enhance the adhesion between the outer surface of the iron cylinder 410 and the inner surface of the mounting cylinder 210.

[0070] Figure 14 A three-dimensional structural diagram of the base in an embodiment of this utility model is shown. The base 1 is a plate-shaped structure. A receiving groove 120 is formed on the side of the plate-shaped structure facing the impeller 2. The shaft tube 110 is located at the center of the receiving groove 120, and the circuit board 317 is housed within the receiving groove 120. The receiving groove 120 serves to accommodate and protect the circuit board 317 and the electronic components on it. Specifically, the plate-shaped structure has a lead wire opening 130 to facilitate the threading of wires connecting the circuit board 317. Furthermore, at least three mounting holes 140 are distributed along the edge of the plate-shaped structure for fixing the fan to the corresponding device.

[0071] In the centrifugal cooling fan of this invention, a bearing pressing part 311 is formed on the upper part of the stator assembly 3, which is sleeved outside the shaft tube 110. The bearing pressing part 311 can press against the oil-impregnated bearing 6 inside the shaft tube 110 to prevent the oil-impregnated bearing 6 from moving, thereby effectively reducing the improper noise caused by the movement of the oil-impregnated bearing 6. Moreover, the oil-impregnated bearing 6 pressed against by the bearing pressing part 311 will also press against the anti-disengagement ring 720 of the anti-movement component 7. The anti-disengagement ring 720 can lock the journal 520 of the rotating shaft 5, thereby preventing the rotating shaft 5 from moving significantly. At the same time, the magnet 740 adsorbed in the metal sleeve 710 can attract the shaft head 510 through the friction plate 730, so that the shaft head 510 is in close contact with the friction plate 730, which can effectively stabilize the rotating shaft 5 and reduce the movement of the rotating shaft 5. Therefore, it can effectively reduce the improper noise caused by the movement of the rotating shaft 5.

[0072] In the oil-impregnated bearing 6, the oil-collecting groove 620 allows the lubricating oil to automatically flow back into the through-hole 610, which helps maintain the lubrication effect between the shaft 5 and the oil-impregnated bearing 6; the clearance groove 630 helps reduce the contact friction between the lower end of the oil-impregnated bearing 6 and the shaft 5; the vertical groove 640 provides space for material deformation and accommodation, which helps reduce the assembly stress during the assembly process of the oil-impregnated bearing 6, and can also serve as a heat dissipation channel, which helps reduce the temperature rise of the oil-impregnated bearing 6 during operation; in addition, the oil-collecting groove 620, the clearance groove 630 and the vertical groove 640 can also provide space for the thermal expansion of the oil-impregnated bearing 6, avoiding the rapid contraction of the through-hole 610 due to thermal expansion, which would affect the rotation of the shaft 5, and improving the reliability of the shaft 5 operation.

[0073] In the shaft tube 110, the vertical rib 111 can restrict the stator assembly 3 to be installed at a specific height in the shaft tube 110, thereby ensuring that the bearing pressing part 311 on the upper part of the stator assembly 3 can properly abut against the oil-impregnated bearing 6 and prevent the oil-impregnated bearing 6 from moving. The limiting rib 112 can not only guide the stator assembly 3 to be sleeved on the shaft tube 110, but also prevent the stator assembly 3 sleeved on the shaft tube 110 from rotating, which is beneficial to improving the assembly stability of the stator assembly 3. The first axial groove 113 can also provide space for material deformation and accommodation, which is beneficial to reducing the assembly process of the oil-impregnated bearing 6. The assembly stress can also serve as a heat dissipation channel, which helps reduce the temperature rise of the oil-impregnated bearing 6 during operation and provides a buffer space for the thermal expansion of the oil-impregnated bearing 6. The axial ribs 114 can firmly hold the metal sleeve 710, so that the metal sleeve 710 is stably embedded in the inner bottom of the shaft tube 110. Moreover, the spacing between these axial ribs 114 and the presence of the stress relief grooves 115 can provide space for material deformation and accommodation, which helps reduce the assembly stress of the metal sleeve 710 during assembly and can provide a buffer space for the thermal expansion of the metal sleeve 710 during operation.

[0074] In the stator assembly 3, the insulating support 310 is directly cast onto the silicon steel laminations 320, which facilitates the firm bonding and solidification of the loose silicon steel laminations 320 into a robust integral structure. This significantly enhances the overall mechanical strength, rigidity, and impact and vibration resistance of the stator assembly 3, and effectively suppresses minor vibrations between the silicon steel laminations 320, thus reducing the operating noise of the stator assembly 3. The first gap prevents the upper end of the shaft tube 110 from pressing against the bearing abutment part 311, allowing the bearing abutment part 311 to fully abut against the upper end of the oil-impregnated bearing 6. The first annular wall 31 2 can effectively block dust and other impurities from entering the shaft tube 110, and at the same time help prevent lubricating oil from running out of the shaft tube 110; the surface between the first annular wall 312 and the fixed shaft seat 211 can be coated with an oil-blocking agent to form an oil-repellent film, which helps lubricating oil to flow back into the shaft tube 110; a winding channel is formed between the first protrusion 313 and the first annular wall 312, and between the second protrusion 315 and the second annular wall 314, which facilitates the winding of the metal coil 330; the second annular wall 314, the second protrusion 315 and the pin 316 cooperate with each other to effectively and stably install the circuit board 317.

[0075] In the impeller 2, the second blade 260 can effectively divide the airflow vortex between two adjacent first blades 240, significantly reducing wind noise; the side wall of the wheel housing 220 smoothly transitions to the annular plate 230, which helps to reduce wind noise when deflecting air; the second axial groove 212 in the mounting cylinder 210 can provide space for material deformation and accommodation, which helps to reduce the assembly stress during the assembly process of the rotor assembly 4.

[0076] The centrifugal cooling fan provided by the embodiments of this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A centrifugal cooling fan, comprising a base, an impeller, a shaft tube formed on the base, a stator assembly sleeved outside the shaft tube, a mounting cylinder formed in the impeller, a rotor assembly disposed along the inner circumferential surface of the mounting cylinder, and a rotating shaft disposed at the center of the mounting cylinder, characterized in that, The rotating shaft is rotatably mounted in the shaft tube based on an oil-impregnated bearing and an anti-slip assembly. The rotor assembly surrounds the stator assembly. The upper part of the stator assembly is formed with a bearing pressing part, which abuts against the upper end of the oil-impregnated bearing. The anti-slip assembly includes a metal sleeve embedded in the bottom of the shaft tube, an anti-detachment ring positioned above the metal sleeve, and a friction plate and a magnet positioned inside the metal sleeve, with the friction plate positioned above the magnet. The shaft has a shaft head formed at one end facing the base, and a journal is formed by a partial radial contraction of the shaft body above the shaft head. The anti-detachment ring is sleeved on the journal, with its inner diameter being smaller than the diameter of the shaft and larger than the diameter of the journal. The lower end of the oil-impregnated bearing abuts against the anti-detachment ring. The shaft head extends into the metal sleeve and contacts the friction plate. One side of the magnet attracts the shaft head, and the other side of the magnet adheres to the metal sleeve.

2. The centrifugal cooling fan as described in claim 1, characterized in that, The oil-impregnated bearing is provided with a through hole, and the rotating shaft is rotatably disposed in the through hole. The upper end of the oil-impregnated bearing has an oil collection groove recessed around the through hole, and the lower end of the oil-impregnated bearing has an anti-cavity groove recessed around the through hole.

3. The centrifugal cooling fan as described in claim 1, characterized in that, The outer circumferential surface of the oil-impregnated bearing is formed with several vertical grooves, which are evenly distributed.

4. The centrifugal cooling fan as described in claim 1, characterized in that, The lower end of the oil-impregnated bearing has a guide portion formed by radial shrinkage on its outer periphery.

5. The centrifugal cooling fan as described in claim 1, characterized in that, The stator assembly consists of an insulating support, silicon steel sheets wrapped in the insulating support, and metal coils wound on the insulating support. The insulating support is sleeved on the shaft tube. The upper end of the insulating bracket is formed with the bearing pressing part, and there is a first gap between the bearing pressing part and the upper end of the shaft tube; The upper end of the insulating bracket is formed with a first annular wall around the bearing pressing part, and a fixed shaft seat is formed on the inner top of the mounting cylinder. One end of the rotating shaft is embedded in the fixed shaft seat, and the first annular wall surrounds the fixed shaft seat. The upper end of the insulating bracket is also formed with a plurality of first protrusions, which are distributed at equal intervals around the first annular wall. A first winding channel exists between any first protrusion and the first annular wall. The lower end of the insulating support is formed with a second annular wall around the geometric center of the insulating support body, and the second annular wall corresponds to the first annular wall; the lower end of the insulating support is formed with a plurality of second protrusions, the plurality of second protrusions are distributed at equal intervals around the second annular wall, the plurality of second protrusions correspond one-to-one with the plurality of first protrusions, and there is a second winding channel between any second protrusion and the second annular wall. The first and second winding channels, which are opposite each other, form a winding channel; the metal coil includes several coil windings, and each coil winding is wound in one of the winding channels.

6. The centrifugal cooling fan as described in claim 5, characterized in that, The ends of the plurality of second protrusions away from the plurality of first protrusions are fixed with a circuit board by welding pins. The upper surface of the circuit board is connected to the lower end of the second annular wall, and the circuit board surrounds the shaft tube.

7. The centrifugal cooling fan as described in claim 1, characterized in that, The outer circumferential surface of the shaft tube is formed with a plurality of vertical ribs, which are evenly distributed around the geometric center of the shaft tube body. The upper ends of the plurality of vertical ribs are located below half the height of the shaft tube body. The stator assembly is axially positioned and mounted on the shaft tube by being blocked by the upper ends of the plurality of vertical ribs. The outer circumferential surface of the shaft tube is also formed with a limiting rib, which extends vertically from the top end of the shaft tube to the bottom end of the shaft tube, and the limiting rib is located between two adjacent vertical ribs; the stator assembly is circumferentially positioned and mounted on the shaft tube by the body of the limiting rib.

8. The centrifugal cooling fan as described in claim 1, characterized in that, The inner circumferential surface of the shaft tube is formed with a plurality of first axial grooves, which are evenly distributed around the geometric center of the shaft tube body and extend vertically from the top end of the shaft tube to the bottom end of the shaft tube; the plurality of first axial grooves are in contact with the outer circumferential surface of the oil-impregnated bearing. The inner circumferential surface of the shaft tube is formed with a plurality of axial ribs, which are distributed at equal intervals around the geometric center of the shaft tube body. The upper ends of the plurality of axial ribs are located below one-quarter of the height of the shaft tube body. The plurality of axial ribs and the plurality of first axial grooves are staggered. A stress relief groove is formed in the center of the inner bottom of the shaft tube. The main body of the metal sleeve is embedded in the center of the plurality of axial protruding ribs, and the bottom of the metal sleeve is connected to the stress relief groove; the upper end of the metal sleeve is bent radially to form an annular sleeve edge, the anti-detachment ring is placed on the annular sleeve edge, and there is a second gap between the annular sleeve edge and the upper end of the plurality of axial protruding ribs.

9. The centrifugal cooling fan as described in claim 1, characterized in that, The impeller includes a housing, an annular plate disposed on the edge of the housing, a plurality of first blades disposed on the annular plate, and a connecting ring connecting the plurality of first blades. The diameter of the connecting ring is larger than the diameter of the annular plate. The lower edge of one end of the plurality of first blades is connected to the annular plate, and the upper edge of the other end of the plurality of first blades is connected to the connecting ring. The plurality of first blades are arranged in a circumferential array around the geometric center of the housing, and the plurality of first blades extend inward from the connecting ring and bend along the rotation direction of the impeller. The connecting ring is connected to a plurality of second blades, which are arranged in a circular array around the geometric center of the wheel housing. The plurality of second blades extend inward from the connecting ring and bend along the rotation direction of the impeller. The plurality of second blades and the plurality of first blades are arranged alternately. The upper edge of the plurality of second blades at the end away from the wheel housing is connected to the connecting ring, the end of the plurality of second blades near the wheel housing is suspended, and the lower edge of the plurality of second blades gradually bends upward toward the wheel housing.

10. The centrifugal cooling fan as described in claim 9, characterized in that, The mounting cylinder is located on the side of the wheel housing facing the base, and the outer peripheral surface of the mounting cylinder is connected to the inner surface of the wheel housing based on a plurality of reinforcing ribs; the inner peripheral surface of the mounting cylinder is formed with a plurality of second axial grooves, and the plurality of second axial grooves are equally spaced around the geometric center of the mounting cylinder; The rotor assembly includes an iron cylinder and a cylindrical magnet arranged coaxially. The iron cylinder is embedded in the mounting cylinder, and the outer circumferential surface of the iron cylinder is in contact with the plurality of second axial grooves. The cylindrical magnet is embedded in the iron cylinder and surrounds the stator assembly.

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