Centrifugal fan and electronic device

Abstract

The embodiment of the application provides a centrifugal fan and electronic equipment, and relates to the technical field of centrifugal fans. The centrifugal fan comprises an upper cover plate and a lower cover plate. At least one of the upper cover plate and the lower cover plate comprises a composite board, and the composite board comprises at least three layers of fiber composite material layers arranged side by side along the thickness direction of the centrifugal fan. The material of the fiber composite material layer comprises a fiber material and a resin material. In this way, the upper cover plate and the lower cover plate are made of the fiber composite material, so that the thickness of the centrifugal fan can be reduced while the weight of the centrifugal fan is reduced, and the electronic equipment can be designed to be light and thin.

Description

Technical Field

[0001] This application relates to the field of centrifugal fan technology, and more particularly to a centrifugal fan and electronic device. Background Technology

[0002] Electronic devices such as laptops, tablets, and mobile phones incorporate heat transfer components and centrifugal fans. The heat transfer component can include a heat transfer section and fins. The fins are typically located at the outlet of the centrifugal fan. Heat generated by the heat-generating device is transferred to the fins through the heat transfer section, and then the airflow from the centrifugal fan's outlet blows across the fins for forced air cooling. However, existing centrifugal fans, while achieving lightweight design, are relatively thick, making it difficult to achieve thinner designs in electronic devices. Summary of the Invention

[0003] This application provides a centrifugal fan and an electronic device that can reduce the thickness and weight of the centrifugal fan, making it easier to design a thinner and lighter electronic device.

[0004] In a first aspect, embodiments of this application provide a centrifugal fan, which includes a volute. The volute includes an upper cover plate and a lower cover plate spaced apart along the thickness direction of the centrifugal fan. At least one of the upper and lower cover plates includes a composite material. The composite material includes at least three fiber composite material layers arranged side-by-side along the thickness direction of the centrifugal fan. The fiber composite material layers are made of fiber material and resin material. The fiber directions of adjacent fiber composite material layers are different, and at least three of the at least three fiber composite material layers are unidirectional fabrics. When the composite material has three unidirectional fabric layers, the total basis weight of the two furthest unidirectional fabric layers is 20% to 25% of the total basis weight of the at least three fiber composite material layers. When the composite material has at least four unidirectional fabric layers, the composite material includes a first unidirectional group and a second unidirectional group. Both the first and second unidirectional groups include multi-layer fiber composite material layers with the same fiber direction. The fiber composite material layers of the first and second unidirectional groups are unidirectional fabrics. The fiber direction of the first unidirectional group is different from that of the second unidirectional group. The basis weight of the first unidirectional group is 30% to 75% of the total basis weight of the at least three fiber composite material layers.

[0005] In this embodiment, while using fiber composite materials to make the upper and lower cover plates, by reasonably setting the total number of unidirectional fabric layers, the total basis weight of the two furthest unidirectional fabric layers or the proportion of the total basis weight of the first unidirectional group to the total basis weight of all fiber composite material layers in the entire composite board, and the fiber direction of each fiber composite material layer, the upper and lower cover plates can achieve lightweight while having a large flexural modulus. For example, the flexural modulus of both the upper and lower cover plates can be greater than or equal to 105 GPa. The upper and lower cover plates have good bending resistance when thinning, which helps the centrifugal fan to achieve weight reduction while thinning.

[0006] In one possible implementation, each layer of fiber composite material is a unidirectional fabric.

[0007] In this embodiment, when the fiber composite material layer is a unidirectional fabric, all fibers are oriented in one direction, which can make the strength and stiffness more fully utilized. The layup angle of each layer can be set as needed to achieve directional reinforcement, which can achieve higher strength and lighter weight.

[0008] In one possible implementation, the fiber orientations of adjacent fiber composite layers are perpendicular to each other.

[0009] In this embodiment, by making the angle between the fiber directions of adjacent fiber composite material layers a right angle, the composite board can obtain high strength and stiffness in both orthogonal directions. The layup design and manufacturing are simple, and the composite board can have high structural stability and crack resistance.

[0010] In one possible implementation, the fiber direction of the first unidirectional group is perpendicular to the fiber direction of the second unidirectional group.

[0011] In this embodiment, the composite board can obtain high strength and stiffness in both orthogonal directions, the ply design and manufacturing are simple, and the composite board can have high structural stability and crack resistance.

[0012] In one possible implementation, when the composite board has at least four unidirectional fabric layers, the two furthest fiber composite layers in the composite board are both unidirectional fabrics, one of the two furthest fiber composite layers has a layup angle of 90° and the other has a layup angle of 0°, and the layup angles of the remaining fiber composite layers include at least one of 0° and 90°.

[0013] In this embodiment, the layup angle of each fiber composite material layer is set to 0° or 90°, which allows the composite board to have greater stiffness and strength in both the 0° and 90° directions. The composite board can also have a greater flexural modulus in both the 0° and 90° directions, meeting the usage requirements of the upper and lower cover plates.

[0014] In one possible implementation, when the composite board has three unidirectional fabric layers, the two furthest fiber composite layers are both unidirectional fabrics, and the fiber directions of the two furthest fiber composite layers are perpendicular to each other.

[0015] In this embodiment, by arranging the two farthest fiber composite material layers in the composite board in mutually perpendicular directions, the composite board can obtain high strength and stiffness in both orthogonal directions. The layup design and manufacturing are simple, and the composite board can have high structural stability and crack resistance.

[0016] In one possible implementation, when the composite board has three unidirectional fabric layers, the two furthest fiber composite material layers in the composite board are both unidirectional fabrics, the layup angles of the two furthest fiber composite material layers are both first angles, and the layup angles of the remaining fiber composite material layers are all second angles. The first angle includes one of 0° and 90°, and the second angle includes the other of 0° and 90°.

[0017] In this embodiment, the layup angle of each fiber composite material layer is set to 0° or 90°, which allows the composite board to have greater stiffness and strength in both the 0° and 90° directions. The composite board can also have a greater flexural modulus in both the 0° and 90° directions, meeting the usage requirements of the upper and lower cover plates.

[0018] In one possible implementation, at least one of the at least three fiber composite material layers includes multiple fiber layers stacked along the thickness direction of the centrifugal fan. The fiber layers are made of resin material and fiber material. Adjacent fiber layers have the same fiber arrangement and the same fiber direction.

[0019] In this embodiment, at least one fiber composite material layer in the composite board is composed of multiple fiber layers, which helps the composite board to have a larger flexural modulus and can save production time and improve the production efficiency of the composite board.

[0020] In one possible implementation, the resin material content in the fiber composite layer is greater than or equal to 20 wt% and less than or equal to 40 wt%.

[0021] In this embodiment, by setting the resin content in the fiber composite material layer to 20wt%~40wt%, the resin can better encapsulate the fiber material and ensure a high fiber content, which can give the fiber composite material better strength, stiffness and comprehensive mechanical properties.

[0022] In one possible implementation, the fiber material content in the fiber composite layer is greater than or equal to 10 wt% and less than or equal to 80 wt%.

[0023] In this embodiment, the fiber content in the fiber composite layer is controlled between 10wt% and 80wt% to ensure that the fiber effectively reinforces the composite material, while also allowing the resin to fully impregnate the fiber, ensuring interfacial bonding and molding quality, thereby obtaining good comprehensive mechanical and process properties.

[0024] In one possible implementation, each fiber composite layer has one type of fiber material. Alternatively, each fiber composite layer has multiple different fiber materials. Or, at least a portion of the three fiber composite layers has one type of fiber material, while another portion has multiple different fiber materials.

[0025] In this embodiment, the fiber composite material layer is made of one or more different fiber materials, which can give the fiber composite material layer greater strength and stiffness, and ensure that the composite board has a large flexural modulus.

[0026] In one possible implementation, the composite plate includes at least four material layers stacked along the thickness direction of the centrifugal fan, at least three of the at least four material layers being fiber composite material layers, and at least one of the at least four material layers being a metal material layer.

[0027] In this embodiment, since metal materials have good strength and a certain deformation capacity, the composite plate is formed by metal materials and fiber composite materials. This can further improve the supporting performance of the composite plate while making it lightweight, so that the upper and lower cover plates can have good flexural modulus while achieving lightweight.

[0028] In one possible implementation, the lower cover plate has a composite material and a flexural modulus greater than or equal to 105 GPa, and / or the upper cover plate has a composite material and a flexural modulus greater than or equal to 105 GPa.

[0029] In this embodiment, the upper cover plate and the lower cover plate can have a large flexural modulus and good bending resistance.

[0030] In one possible implementation, the lower cover plate has a composite material. The centrifugal fan also includes a central tube located inside the volute, one end of which is embedded inside the lower cover plate, with the bottom surface of the central tube flush with the bottom surface of the lower cover plate.

[0031] In this embodiment, when the lower cover plate is formed from composite material, a multi-layer stacking method allows the lower cover plate to wrap around one end of the middle tube, ensuring that the bottom surface of the lower cover plate is flush with the bottom surface of the middle tube. The mating surface between the lower cover plate and the middle tube is a complete flat surface, preventing film marks caused by unevenness when the lower cover plate faces the display screen. Furthermore, compared to riveting the middle tube to the lower cover plate, wrapping the middle tube with the lower cover plate eliminates the need for additional injection molding to fill the gap between them, and the bonding force between the lower cover plate and the middle tube is greater than that of the riveting method. Additionally, the flatness of the joint between the lower cover plate and the middle tube when the lower cover plate wraps around the middle tube is superior to the flatness of the method that fills the gap between the middle tube and the lower cover plate through injection molding.

[0032] In one possible implementation, the central tube includes a first part, a second part, and a third part connected sequentially along the thickness direction of the centrifugal fan. The outer diameters of the first part and the third part are both smaller than the outer diameter of the second part, and the first part and the third part form a stepped structure with the second part. The lower cover plate has a mating through hole for inserting the central tube. The inner wall of the mating through hole has an annular groove surrounding the center line of the mating through hole, and the second part fills the interior of the annular groove.

[0033] In this embodiment, the lower cover plate can wrap around the middle tube, which can give the lower cover plate and the middle tube a greater bonding force.

[0034] In one possible implementation, the centrifugal fan further includes an impeller disposed inside the volute and rotatably connected to it. The volute also includes a sidewall disposed between a lower cover plate and an upper cover plate and fixedly connected to the upper and lower cover plates. The sidewall and the lower cover plate are integrally injection molded. The sidewall has a pressure relief hole with a first opening and a second opening spaced apart in the rotation direction of the impeller. The first opening communicates with the interior of the volute, and the second opening communicates with the exterior of the volute. Along the rotation direction of the impeller, the second opening is located behind the first opening.

[0035] In this embodiment, when the sidewall is connected to the lower cover plate by injection molding, stress concentration can be avoided by setting stress relief holes, thus achieving the purpose of stress release. In addition, by placing the second opening behind the first opening, aerodynamic performance loss can be reduced.

[0036] In one possible implementation, the resin material includes at least one of polyamide, polycarbonate, polyoxymethylene, polyphenylene sulfide, polyetheretherketone, polytetrafluoroethylene, polyethylene, polypropylene, polyvinyl chloride, polystyrene, epoxy resin, phenolic resin, urea-formaldehyde resin, unsaturated polyester resin, silicone resin, or polyimide resin.

[0037] In one possible implementation, the fiber material includes at least one of carbon fiber, glass fiber, ceramic fiber, basalt fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, or polyester fiber.

[0038] Secondly, embodiments of this application provide an electronic device including a centrifugal fan as described in the first aspect. Attached Figure Description

[0039] Figure 1 A cross-sectional schematic diagram of an electronic device provided in an embodiment of this application;

[0040] Figure 2 for Figure 1 The diagram shows a top view of the electronic device with its casing removed.

[0041] Figure 3 This is a schematic diagram of another centrifugal fan provided in an embodiment of this application;

[0042] Figure 4 for Figure 3 The diagram shows an explosion of a centrifugal fan.

[0043] Figure 5 A cross-sectional schematic diagram of a composite board provided in an embodiment of this application;

[0044] Figure 6 for Figure 5 An exploded view of the composite panel shown.

[0045] Figure 7 A cross-sectional schematic diagram of a composite board provided in an embodiment of this application;

[0046] Figure 8 for Figure 7 An exploded view of the composite panel shown.

[0047] Figure 9 A cross-sectional schematic diagram of another composite material provided in an embodiment of this application;

[0048] Figure 10 The embodiment of this application provides a method for the mating of a middle tube and a lower cover plate. Figure 4 A cross-sectional view along the MM direction;

[0049] Figure 11 for Figure 10 A cross-sectional view of the lower cover plate;

[0050] Figure 12 A schematic diagram of a reference stack provided for an embodiment of this application;

[0051] Figure 13A top view schematic diagram of the first stack of material and its connection with the central tube provided in an embodiment of this application;

[0052] Figure 14 for Figure 13 A cross-sectional view along the AA direction;

[0053] Figure 15 A top view schematic diagram of the lower cover plate and the middle tube provided in an embodiment of this application;

[0054] Figure 16 for Figure 15 Cross-sectional view along the BB direction;

[0055] Figure 17 This is a cross-sectional view of another lower cover plate before riveting to the middle tube, provided in an embodiment of this application.

[0056] Figure 18 This is a cross-sectional view of another lower cover plate riveted to the middle tube, provided in an embodiment of this application.

[0057] Figure 19 A top view schematic diagram of another reference stack provided for an embodiment of this application;

[0058] Figure 20 This is a schematic diagram of the structure of a lower cover plate provided in an embodiment of this application;

[0059] Figure 21 A top view schematic diagram of a centrifugal fan provided for an embodiment of this application;

[0060] Figure 22 This is an internal schematic diagram of another centrifugal fan provided in an embodiment of this application.

[0061] Explanation of reference numerals in the attached figures:

[0062] 10. Centrifugal fan; 11. Volute; 111. Top cover; 112. Bottom cover; 113. Side wall; 12. Impeller; 121. Fan blade; 122. Hub; 13. Drive motor; 131. Stator; 132. Rotor; 14. Rotating shaft; 15. Central tube; 151. First part; 152. Second part; 153. Third part; 16. Bearing; 17. Air outlet; 18. Air inlet; 19. Circuit board;

[0063] 20. Heating components;

[0064] 30. Heat transfer element; 31. Heat transfer body; 32. Fins;

[0065] 40. Outer casing; 41. Air outlet;

[0066] 50. Fiber composite layer; 51. First fiber composite layer; 52. Second fiber composite layer; 53. Third fiber composite layer; 54. Fourth fiber composite layer; 55. Fifth fiber composite layer; 56. Sixth fiber composite layer;

[0067] 60. Fiber layer; 61. Fiber bundle; 62. Resin body;

[0068] 70. Composite board; 71. First unidirectional group; 72. Second unidirectional group;

[0069] 80. Fitting through hole; 81. Annular groove;

[0070] 90. Pressure relief hole; 91. First opening; 92. Second opening;

[0071] 100. Screws;

[0072] 1. Base stack; 2. First stack; 3. Second stack. Detailed Implementation

[0073] The technical solutions of the embodiments of this application are described below with reference to the accompanying drawings. In the description of the embodiments of this application, the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one or more (including two). The terms “comprising,” “including,” “having,” and variations thereof mean “including but not limited to,” unless otherwise specifically emphasized. The term “connection” includes direct connections and indirect connections, unless otherwise stated. “First” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0074] References to "one embodiment" or "some embodiments" in the embodiments described in this application mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0075] In the embodiments of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0076] Furthermore, the limitations on relative positional relationships mentioned in the embodiments of this application, such as parallelism and perpendicularity, are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallelism or perpendicularity are acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0077] This application provides an electronic device, which may include, but is not limited to, mobile phones, portable Android devices (PADs), laptops, 2-in-1 tablets / computers, personal digital assistants (PDAs), servers, switches, computing devices, in-vehicle devices, wearable devices, smart locks, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. Wearable devices may include, but are not limited to, smartwatches.

[0078] Please see Figures 1 to 2 , Figure 1 This is a cross-sectional schematic diagram of an electronic device provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows a top view of the electronic device with its outer casing removed (40mm). In the diagram, the X direction represents the length of the electronic device, the Y direction represents its width, and the Z direction represents its thickness. It should be understood that... Figure 1The electronic device is shown only schematically, and the actual shape, size, location, and construction of these components are not subject to change. Figure 1 Due to limitations, electronic devices may also include, compared to Figure 1 More or fewer parts.

[0079] In some embodiments, the electronic device may include a housing 40, a heating element 20, a heat transfer element 30, and a centrifugal fan 10. The centrifugal fan 10, heat transfer element 30, and heating element 20 may all be disposed inside the housing 40. The housing 40 may have an air outlet 41 and an air inlet (not shown in the figure). The air inlet allows outside cold air to enter the housing 40, and the air outlet 41 vents hot air from inside the housing 40 to the outside. The heat transfer element 30 may include a heat transfer body 31 and multiple fins 32. The heat transfer body 31 transfers heat generated by the heating element 20 to the fins 32. The fins 32 may be located between the air outlet 17 of the centrifugal fan 10 and the air outlet 41 of the housing 40. The centrifugal fan 10 may have an air outlet 17 and an air inlet 18, both of which communicate with the internal space of the housing 40.

[0080] When the electronic device is working, the heat generated by the heating device 20 can be transferred to the fins 32 through the heat transfer body 31. The airflow blown out by the air outlet 17 of the centrifugal fan 10 flows to the fins 32. The air passing through the fins 32 exchanges heat with the fins 32 and finally flows out to the outside through the air outlet 41, carrying away the heat and ensuring that the temperature of the heating device 20 is within the corresponding range.

[0081] For example, the heat transfer element 30 may include, but is not limited to, a heat spreader, a heat pipe, a heat-conducting plate (e.g., a copper plate), etc.

[0082] For example, the heat-generating device 20 may include, but is not limited to, a central processing unit (CPU), a graphics processing unit (GPU), a SOC chip, a power management module, a high-speed transmission chip, etc.

[0083] For example, the thickness direction of the centrifugal fan 10 can be parallel to the thickness direction of the electronic device, the length direction of the centrifugal fan 10 can be parallel to the length direction of the electronic device, and the width direction of the centrifugal fan 10 can be parallel to the width direction of the electronic device.

[0084] Please see Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of another centrifugal fan 10 provided in an embodiment of this application. Figure 4 for Figure 3 The diagram shown is an exploded view of the centrifugal fan 10. It should be understood that... Figure 4 The centrifugal fan 10 is shown only schematically, and the actual shape, size, location, and construction of these components are not subject to change. Figure 4 Due to limitations, the centrifugal fan 10 can also include, compared to Figure 4 More or fewer parts.

[0085] In some embodiments, the centrifugal fan 10 may include a volute 11, an impeller 12, a drive motor 13, a rotating shaft 14, and a circuit board 19. The impeller 12, drive motor 13, rotating shaft 14, and circuit board 19 may all be located inside the volute 11. The volute 11 may be mounted on the housing 40. The volute 11 may be rotatably connected to the impeller 12 via the rotating shaft 14. The volute 11 may have an air inlet 18 and an air outlet 17. Both the air inlet 18 and the air outlet 17 are in communication with the internal space of the volute 11. The rotating impeller 12 may be used to drive the airflow inside the volute 11, so that the air inside the volute 11 is blown out from the air outlet 17, and the air outside the volute 11 flows into the volute 11 through the air inlet 18, thereby generating airflow.

[0086] For example, the impeller 12 may include a hub 122 and a plurality of fan blades 121 arranged circumferentially along the hub 122. The fan blades 121 are fixedly connected to the hub 122, and the hub 122 can be rotatably connected to the volute 11 via a rotating shaft 14.

[0087] For example, the fan blade 121 can be fixedly connected to the hub 122 by welding, snap-fitting, fastener connection, integral molding, or other methods.

[0088] For example, the drive motor 13 is used to drive the impeller 12 to rotate. The drive motor 13 may be, but is not limited to, an electric motor, a hydraulic motor, etc.

[0089] For example, the drive motor 13 may include a stator 131 and a rotor 132. The stator 131, rotor 132 and impeller 12 are coaxially arranged. The stator 131 may be fixedly connected to the volute 11, and the rotor 132 may be fixedly connected to the impeller 12. The stator 131 is used to drive the rotor 132 to rotate, so as to drive the impeller 12 to rotate relative to the volute 11.

[0090] For example, the stator 131 can drive the rotor 132 to rotate via electromagnetic induction.

[0091] For example, circuit board 19 can be fixedly mounted on volute 11, and drive motor 13 can be mounted on circuit board 19. Circuit board 19 can be electrically connected to drive motor 13 to supply power to drive motor 13. Circuit board 19 can adjust the speed of drive motor 13 by adjusting the voltage and current supplied to drive motor 13. For example, stator 131 of drive motor 13 can be fixedly mounted on circuit board 19 and electrically connected to circuit board 19.

[0092] For example, the volute 11 may include an upper cover plate 111, a side wall 113, and a lower cover plate 112. The upper cover plate 111 and the lower cover plate 112 may be spaced apart in the thickness direction of the centrifugal fan 10. The side wall 113 is located between the upper cover plate 111 and the lower cover plate 112, and both ends of the side wall 113 are fixedly connected to the upper cover plate 111 and the lower cover plate 112, respectively. The upper cover plate 111, the lower cover plate 112, and the side wall 113 form the internal space of the volute 11. The internal space of the volute 11 can serve as the internal flow channel of the centrifugal fan 10. An air inlet 18 is provided on the upper cover plate 111. The two ends of the air outlet 17 extend to the lower cover plate 112 and the upper cover plate 111, respectively. That is, the two ends of the air outlet 17 connected to the lower cover plate 112 and the upper cover plate 111 are both open structures.

[0093] For example, the lower cover plate 112 is rotatably connected to the hub 122 via a rotating shaft 14, thereby achieving a rotatable connection between the volute 11 and the impeller 12. The rotating shaft 14 and the lower cover plate 112 can be separate structures, or they can be an integral structure.

[0094] For example, the centrifugal fan 10 may further include a bearing 16 and a central tube 15, both of which are located inside the volute 11. The central tube 15, bearing 16, and rotating shaft 14 are all coaxially arranged. The central tube 15 can be riveted to the lower cover plate 112. The bearing 16 and rotating shaft 14 can both be located inside the central tube 15, with the bearing 16 located inside the central tube 15 and fitted onto the rotating shaft 14. By providing the central tube 15, the impact resistance of the centrifugal fan 10 can be improved, enhancing its drop protection performance. Furthermore, by placing the bearing 16 between the central tube 15 and the rotating shaft 14, friction between the rotating shaft 14 and the central tube 15 can be reduced, resulting in smoother rotation of the rotating shaft 14 and extending the service life of the equipment.

[0095] When the centrifugal fan 10 is used inside an electronic device, it is required to have good compressive strength, especially the upper cover 111 and the lower cover 112, which need to have good compressive strength to avoid excessive deformation of the upper cover 111 and the lower cover 112, which would cause the fan blades 121 to be pushed up and generate scraping noise, affecting the user experience. In one embodiment, the upper cover 111 and the lower cover 112 can both be made of metal materials, such as stainless steel or aluminum alloy. When stainless steel is used, the fan's compressive strength is good; however, stainless steel has a high density, resulting in a heavier fan and increasing the weight of the electronic device, which contradicts the goal of lightweight electronic devices. When aluminum alloy is used, for example, a material with a density of 2.7 g / mm³... 3 High-strength aluminum material can reduce the weight of the upper cover plate 111 and the lower cover plate 112. However, the extrusion characteristics of high-strength aluminum material are poor, and the thickness of the upper cover plate 111 and the lower cover plate 112 needs to be increased, which will result in a larger thickness of the centrifugal fan 10, thus limiting the thinning design of electronic devices.

[0096] In addition, when the centrifugal fan 10 is applied to an electronic device with a display screen, if the lower cover plate 112 is located between the upper cover plate 111 and the display screen of the electronic device, since the lower cover plate 112 is riveted to the middle tube 15, there is a pit at the joint between the middle tube 15 and the lower cover plate 112, which will cause the display screen to have a screen pressing film problem.

[0097] In view of this, please refer to Figure 5 and Figure 6 , Figure 5 This is a cross-sectional schematic diagram of a composite board 70 provided in an embodiment of this application. Figure 6 for Figure 5 An exploded view of the composite panel 70 shown.

[0098] In some embodiments, at least one of the upper cover plate 111 and the lower cover plate 112 includes a composite plate 70. The composite plate 70 may include at least three fiber composite material layers 50 arranged side by side along the thickness direction of the centrifugal fan 10. The fiber composite material layers 50 are made of fiber material and resin material. The fiber directions of adjacent fiber composite material layers 50 are different, and at least three of the at least three fiber composite material layers 50 are unidirectional fabrics. When the composite plate 70 has three unidirectional fabrics, the total basis weight of the two farthest unidirectional fabrics is 20% to 25% of the total basis weight of the at least three fiber composite material layers 50. Here, fiber direction can be understood as the length direction or axial direction of the fiber.

[0099] For example, both the upper cover plate 111 and the lower cover plate 112 have composite sheet material 70, that is, the material of both the upper cover plate 111 and the lower cover plate 112 can be fiber composite material. In some other embodiments, one of the upper cover plate 111 and the lower cover plate 112 can have composite sheet material 70, and the other can be a metal cover plate or a plastic cover plate. For example, the lower cover plate 112 can have composite sheet material 70, and the upper cover plate 111 can be a stainless steel cover plate.

[0100] For example, the resin material may include at least one of thermosetting resins and thermoplastic resins. Thermosetting resins may include at least one of epoxy resins, phenolic resins, urea-formaldehyde resins, unsaturated polyester resins, silicone resins, polyimide resins, etc. Thermoplastic resins may include at least one of polyamides, polycarbonate, polyoxymethylene, polyphenylene sulfide, polyetheretherketone, polytetrafluoroethylene, polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.

[0101] For example, the fiber material may include at least one of inorganic fibers and organic fibers. The inorganic fibers may include at least one of carbon fiber, glass fiber, ceramic fiber, and basalt fiber, while the organic fibers may include at least one of aramid fiber, ultra-high molecular weight polyethylene fiber, or polyester fiber.

[0102] In practical implementation, appropriate fiber materials can be selected according to specific needs, such as M40 carbon fiber. For example, M40 carbon fiber refers to a specific grade or type of carbon fiber. M40 carbon fiber generally comprises approximately 99.12% carbon and 0.074% nitrogen. The core-sheath structure of M40 carbon fiber is not obvious, resulting in improved structural uniformity and a higher degree of graphite crystal orientation. M40 carbon fiber exhibits reduced deformation under external forces and has a higher modulus, enabling the composite board 70 to possess a higher modulus. In one embodiment, the modulus of M40 carbon fiber is approximately 370 GPa. It is understood that M represents a carbon fiber product series designation. This meaning will not be repeated hereafter.

[0103] Understandably, a core-skin structure typically refers to a special fibrous structure where the fiber consists of an outer "skin" and an inner "core." Graphite crystallites are tiny crystalline structures formed by carbon atoms arranged in a hexagonal grid. The degree of orientation of graphite crystallites reflects the consistency of their orientation within the material. A higher degree of orientation means that these graphite crystallites are more neatly arranged in a specific direction.

[0104] For example, the fiber composite layer 50 can be formed by curing a fiber prepreg, that is, the fiber composite layer 50 can be understood as a structure obtained by hot pressing after fiber prepreg is formed. The fiber composite layer 50 may include a resin body 62 and multiple fiber bundles 61, the fiber bundles 61 may be embedded inside the resin body 62, or the resin body 62 may wrap the fiber bundles 61.

[0105] In some embodiments, the fiber content in the fiber composite layer 50 can be greater than or equal to 10 wt% and less than or equal to 80 wt%, that is, the fiber content in the fiber composite layer 50 can be in the range of 10 wt% to 80 wt% (including the endpoint values ​​of 10 wt% and 80 wt%).

[0106] For example, the fiber content in the fiber composite layer 50 can be 50wt%, 40wt%, 75wt%, 65wt%, etc.

[0107] In this embodiment, the fiber content in the fiber composite layer 50 is controlled between 10wt% and 80wt% to ensure that the fiber effectively reinforces the composite material and that the resin fully impregnates the fiber, thus ensuring interfacial bonding and molding quality, resulting in good comprehensive mechanical and processing properties.

[0108] In some embodiments, the resin material content in the fiber composite layer 50 is greater than or equal to 20 wt% and less than or equal to 40 wt%.

[0109] For example, the resin content in the fiber composite layer 50 can be 20wt%, 21wt%, 24wt%, 26.5wt%, 30wt%, 40wt%, etc.

[0110] In this embodiment of the application, by setting the content of resin material in the fiber composite layer 50 in the range of 20wt% to 40wt% (including the endpoint values ​​of 20wt% and 40wt%), the resin can better encapsulate the fiber material and ensure that the content of fiber material is high, so that the fiber composite material can have better strength, stiffness and comprehensive mechanical properties.

[0111] For example, the number of fiber composite material layers 50 can be three, which can be a first fiber composite material layer 51, a second fiber composite material layer 52, and a third fiber composite material layer 53 stacked along the thickness direction of the centrifugal fan 10. In other embodiments, the number of fiber composite material layers 50 can also be more than three.

[0112] For example, the fiber arrangement of the first fiber composite layer 51, the second fiber composite layer 52 and the third fiber composite layer 53 is unidirectional, that is, the first fiber composite layer 51, the second fiber composite layer 52 and the third fiber composite layer 53 can all be unidirectional.

[0113] For example, the first fiber composite layer 51 and the third fiber composite layer 53 can be the two unidirectional fabrics furthest apart in the composite board 70, and the fiber orientations of the first fiber composite layer 51 and the third fiber composite layer 53 (e.g., Figure 6 The fiber directions of the first fiber composite layer 51 and the third fiber composite layer 53 are the same (as shown in a2 direction), which can be understood as the fiber directions of the first fiber composite layer 51 and the third fiber composite layer 53 being parallel to each other, or in other words, the angle between the arrangement directions of the first fiber composite layer 51 and the third fiber composite layer 53 being 0°. The fiber directions of the first fiber composite layer 51 and the third fiber composite layer 53 are different from the fiber direction of the second fiber composite layer 52. The fiber arrangement directions of the first fiber composite layer 51 and the third fiber composite layer 53 (as shown in a2 direction) are the same. Figure 6 (a2 direction) and the fiber direction of the second fiber composite layer 52 (e.g., the direction of a2 ... Figure 6 The included angle between the directions (a1 and a1) can be either acute or right angle.

[0114] For example, "same direction" can be understood as two or more directions being parallel to each other, or the angle between two directions being 0°. "Two different directions" can be understood as two directions being set at an angle, with the angle between the two directions being greater than 0°, or the angle between the two directions being a right angle or an acute angle.

[0115] For example, the composite board 70 has three layers of unidirectional fabric. The first fiber composite layer 51 and the third fiber composite layer 53 are the two unidirectional fabric layers furthest apart in the composite board 70. The total basis weight of the first fiber composite layer 51 and the third fiber composite layer 53 can be 20% of the total basis weight of all fiber composite layers 50 in the composite board 70. For example, the total basis weight of the first fiber composite layer 51 and the third fiber composite layer 53 can be 100 g / m². 2 The total basis weight of the first fiber composite layer 51, the second fiber composite layer 52, and the third fiber composite layer 53 can be 500 g / m³. 2 The total weight of the first fiber composite layer 51 and the third fiber composite layer 53 can be 20% of the total weight of all fiber composite layers 50 of the composite board 70.

[0116] In other embodiments, the total weight of the first fiber composite layer 51 and the third fiber composite layer 53 may also account for other proportions of the total weight of all fiber composite layers 50 in the composite board 70, such as 21%, 22%, 24%, 25%, etc.

[0117] Because fiber composites have a smaller density range than conventional metal materials (such as aluminum alloys), they have a significant weight advantage over metal materials, making it easier to achieve lightweighting in applications using fiber composites. Furthermore, fiber composites have higher strength than conventional metal materials, thus enabling applications using fiber composites to achieve both lightweighting and high strength.

[0118] Furthermore, when the composite board 70 has three layers of unidirectional fabric, by reasonably setting the total number of fiber composite material layers 50, the proportion of the total weight of the two furthest unidirectional fabric layers to the total weight of all fiber composite material layers 50 in the entire composite board 70, and the fiber direction of each fiber composite material layer 50, the composite board 70 can have a larger flexural modulus. For example, the composite board 70 can have a large flexural modulus in both the fiber direction of the first fiber composite material layer 51 and the fiber direction perpendicular to the first fiber composite material layer 51, so that the composite board 70 has good bending resistance and good support performance.

[0119] For example, the flexural modulus of the composite board 70 in both the fiber direction and perpendicular to the fiber direction of the first fiber composite layer 51 can be greater than 105 GPa. For instance, the flexural modulus of the composite board 70 in both the fiber direction and perpendicular to the fiber direction of the first fiber composite layer 51 can be, but is not limited to, 105 GPa, 106 GPa, 108.5 GPa, etc. In other embodiments, the flexural modulus of the composite board 70 can also be less than 105 GPa, for example, 104 GPa.

[0120] In this embodiment, while using fiber composite materials to make the upper cover plate 111 and the lower cover plate 112, by reasonably setting the total number of unidirectional fiber composite material layers 50, the proportion of the total weight of the two farthest unidirectional fabric layers to the total weight of all fiber composite material layers 50 in the entire composite board 70, and the fiber direction of each fiber composite material layer 50, the upper cover plate 111 and the lower cover plate 112 can achieve lightweight while having a large flexural modulus. For example, the flexural modulus of the upper cover plate 111 and the lower cover plate 112 can both be greater than or equal to 105 GPa. The upper cover plate 111 and the lower cover plate 112 have good bending resistance when thinning design, which helps the centrifugal fan 10 to achieve weight reduction design while thinning.

[0121] Please continue reading. Figure 5 and Figure 6 In some embodiments, the fiber arrangement of each fiber composite layer 50 can be unidirectional, so that each fiber composite layer 50 is a unidirectional fabric. For example, the first fiber composite layer 51, the second fiber composite layer 52 and the third fiber composite layer 53 are all unidirectional fabrics.

[0122] In this embodiment, when the fiber composite layer 50 is a unidirectional fabric, all fibers are oriented in one direction, which can make the strength and stiffness more fully utilized. The layup angle of each layer can be set as needed to achieve directional reinforcement, which can achieve higher strength and lighter weight.

[0123] For example, the layup angle refers to the angle between the fiber direction of the fiber composite layer 50 and the reference direction, which may be the load direction or the principal direction.

[0124] The preceding text described that the fiber arrangement of each fiber composite layer 50 is unidirectional. In some embodiments, the fiber arrangement of a portion of the fiber composite layer 50 in the composite board 70 can be unidirectional, while the fiber arrangement of another portion of the fiber composite layer 50 can be woven. This allows a portion of the fiber composite layer 50 in the composite board 70 to be unidirectional fabric, while another portion can be woven fabric. Here, woven arrangement refers to a fiber arrangement in which the fibers are interwoven along two mutually perpendicular directions (warp and weft).

[0125] For example, the composite board 70 may include four fiber composite material layers 50, which may be a first fiber composite material layer 51, a second fiber composite material layer 52, a third fiber composite material layer 53, and a fourth fiber composite material layer 54. The fiber arrangement of the first fiber composite material layer 51, the second fiber composite material layer 52, and the fourth fiber composite material layer 54 may be unidirectional, and the fiber arrangement of the third fiber composite material layer 53 may be woven.

[0126] In some embodiments, the fiber orientations of adjacent fiber composite layers 50 may be perpendicular to each other.

[0127] For example, the fiber orientation of both the first fiber composite layer 51 and the third fiber composite layer 53 can be […]. Figure 6 In the a2 direction, the fiber direction of the second fiber composite layer 52 can be... Figure 6 In the direction a1, the fiber directions of the first fiber composite layer 51 and the third fiber composite layer 53 are perpendicular to the fiber arrangement direction of the second fiber composite layer 52, or in other words, the angle between the fiber directions of the first fiber composite layer 51 and the third fiber composite layer 53 and the fiber arrangement direction of the second fiber composite layer 52 is 90°.

[0128] In this embodiment of the application, by making the included angle between the fiber directions of adjacent fiber composite material layers 50 a right angle, the composite board 70 can obtain high strength and stiffness in both orthogonal directions. The layup design and manufacturing are simple, and the composite board 70 can have high structural stability and crack resistance.

[0129] For example, in actual implementation, considering process errors, the included angle between the fiber directions of adjacent fiber composite material layers 50 is greater than or equal to 88° and less than or equal to 92°, and can be considered as the fiber directions of adjacent fiber composite material layers 50 being perpendicular to each other.

[0130] The preceding text describes that the fiber directions of adjacent fiber composite layers 50 are perpendicular to each other. In other embodiments, the included angle between the fiber directions of adjacent fiber composite layers 50 may include angles other than 90°, such as 45°, 55°, 60°, etc.

[0131] For example, the composite board 70 may include four fiber composite material layers 50, which may be a first fiber composite material layer 51, a second fiber composite material layer 52, a third fiber composite material layer 53, and a fourth fiber composite material layer 54. The first fiber composite material layer 51, the second fiber composite material layer 52, the third fiber composite material layer 53, and the fourth fiber composite material layer 54 may all be unidirectional fabrics. The fiber directions of the first fiber composite material layer 51 and the second fiber composite material layer 52 are perpendicular to each other. The angle between the fiber directions of the second fiber composite material layer 52 and the third fiber composite material layer 53 may be 45°. The fiber directions of the third fiber composite material layer 53 and the fourth fiber composite material layer 54 are perpendicular to each other.

[0132] In some embodiments, when the composite board 70 has three unidirectional fabrics, the two furthest fiber composite material layers 50 in the composite board 70 are both unidirectional fabrics, the layup angle of the two furthest fiber composite material layers 50 is a first angle, and the layup angle of the remaining fiber composite material layers 50 is a second angle. The first angle includes one of 0° and 90°, and the second angle includes the other of 0° and 90°.

[0133] For example, the composite board 70 may include a first fiber composite material layer 51, a second fiber composite material layer 52, and a third fiber composite material layer 53 stacked together. The first fiber composite material layer 51 and the third fiber composite material layer 53 are the two fiber composite material layers 50 furthest apart in the composite board 70. Both the first fiber composite material layer 51 and the third fiber composite material layer 53 can be unidirectional fabrics. The layup angles of the first fiber composite material layer 51, the second fiber composite material layer 52, and the third fiber composite material layer 53 can be 0°, 90°, and 0°, respectively. In some other embodiments, the layup angles of the first fiber composite material layer 51, the second fiber composite material layer 52, and the third fiber composite material layer 53 can also be 90°, 0°, and 90°, respectively.

[0134] In this embodiment of the application, the layup angle of each fiber composite material layer 50 is set to 0° or 90°, which can make the composite plate 70 have greater stiffness and strength in both the 0° and 90° directions. The composite plate 70 can also have a greater flexural modulus in both the 0° and 90° directions, which can meet the usage requirements of the upper cover plate 111 and the lower cover plate 112.

[0135] In other embodiments, when the number of fiber composite material layers 50 is more than three, the second angle may include other angles besides 0° and 90°, such as 45°, 60°, etc. For example, when the composite board 70 includes five fiber composite material layers 50, the layup angles of the five fiber composite material layers 50 may be arranged in the order of 0°, 90°, 30°, 45°, and 0°.

[0136] Please continue reading Figure 5 and Figure 6 In some embodiments, at least one of the at least three fiber composite material layers 50 includes multiple fiber layers 60 stacked along the thickness direction of the centrifugal fan 10. The fiber layers 60 are made of resin material and fiber material, and adjacent fiber layers 60 have the same fiber arrangement and the same fiber direction. That is, at least one fiber composite material layer 50 in the composite board 70 includes multiple fiber layers 60 stacked along the thickness direction of the centrifugal fan 10.

[0137] For example, when the composite board 70 has three unidirectional fabric layers, the number of fiber composite material layers 50 can be three. Except for the two furthest fiber composite material layers 50, the remaining fiber composite material layers 50 in the composite board 70 have multiple fiber layers 60. For instance, the composite board 70 may include a first fiber composite material layer 51, a second fiber composite material layer 52, and a third fiber composite material layer 53 stacked together. The second fiber composite material layer 52 may include four stacked fiber layers 60, with each fiber layer 60 having a unidirectional fiber arrangement. The fiber directions of adjacent fiber layers 60 (e.g., ...) are also unidirectional. Figure 6 (in the same direction as a1).

[0138] In other embodiments, the fiber composite layer 50 may be composed of a number of fiber layers 60 in addition to four fiber layers 60, such as two, three or five fiber layers 60.

[0139] For example, in a fiber composite layer 50 having multiple fiber layers 60, adjacent fiber layers 60 have the same layup angle. For instance, the layup angle of any two fiber layers 60 in the second fiber composite layer 52 can be 0° or 90°.

[0140] For example, in a fiber composite layer 50 having multiple fiber layers 60, the basis weight of adjacent fiber layers 60 may be the same or different. For instance, in the second fiber composite layer 52, the basis weight of adjacent fiber layers 60 may all be 50 g / m³. 2 .

[0141] In some embodiments, the number of fiber composite material layers 50 formed by multiple fiber layers 60 in the composite board 70 may be at least two, except that there is only one layer. For example, the first fiber composite material layer 51 and the second fiber composite material layer 52 may both include multiple layers of fiber layers 60 stacked together.

[0142] In this embodiment, at least one fiber composite material layer 50 in the composite board 70 is composed of multiple fiber layers 60, which helps the composite board 70 to have a larger flexural modulus and can save production time and improve the production efficiency of the composite board 70.

[0143] For example, each fiber composite layer 50 has one fiber material, such as M40 carbon fiber. In other embodiments, each fiber composite layer 50 has multiple different fiber materials, or a portion of the at least three fiber composite layers 50 of the composite panel 70 has one fiber material and another portion has multiple different fiber materials.

[0144] In this embodiment, the fiber composite layer 50 is made of one or more different fiber materials, which can give the fiber composite layer 50 greater strength and stiffness, and ensure that the composite board 70 has a larger flexural modulus.

[0145] In some embodiments, the composite panel 70 can be made of fiber composite material, that is, the composite panel 70 does not contain metal material.

[0146] In some embodiments, the composite panel 70 can also be made of fiber composite materials and metal materials. By using different materials, the composition of the composite panel 70 can be more diversified and can be flexibly adjusted according to the application scenario.

[0147] In some embodiments, the composite plate 70 may include at least four material layers stacked along the thickness direction of the centrifugal fan 10, at least three of the at least four material layers being fiber composite material layers 50, and at least one of the at least four material layers being a metal material layer.

[0148] For example, the material of the metal layer can be, but is not limited to, titanium alloy, aluminum alloy, copper alloy, stainless steel, etc.

[0149] For example, the composite board 70 may include four material layers, of which three material layers may be fiber composite material layers 50 and the remaining material layer may be a metal material layer.

[0150] In some examples, one of the top and bottom layers of the composite panel 70 can be a fiber composite material layer 50, and the other can be a metal material layer. In other examples, both the top and bottom layers of the composite panel 70 can be fiber composite material layers 50, or both can be metal material layers.

[0151] In this embodiment, since metal materials have good strength and a certain deformation capacity, the composite plate 70 is formed by metal materials and fiber composite materials. This can further improve the supporting performance of the composite plate 70 while making it lighter, so that the upper cover plate 111 and the lower cover plate 112 can have good flexural modulus while achieving lightweighting.

[0152] As described above, the composite board 70 has three layers of unidirectional fabric. However, the number of unidirectional fabrics in the composite board 70 can also be more than three, which can also ensure that the composite board 70 has a large flexural modulus.

[0153] Please see Figure 7 and Figure 8 , Figure 7 This is a cross-sectional schematic diagram of a composite board 70 provided in an embodiment of this application. Figure 8 for Figure 7 An exploded view of the composite panel 70 shown.

[0154] In some embodiments, the composite board 70 may include at least four fiber composite material layers 50 arranged side by side along the thickness direction of the centrifugal fan 10. The fiber composite material layers 50 are made of fiber materials and resin materials. The fiber directions of adjacent fiber composite material layers 50 are different. All four fiber composite material layers 50 in the composite board 70 are unidirectional fabrics. When the composite board 70 has at least four unidirectional fabrics, the composite board 70 may include a first unidirectional group 71 and a second unidirectional group 72. Both the first unidirectional group 71 and the second unidirectional group 72 include multiple layers of fiber composite material layers 50 with the same fiber direction. The fiber composite material layers 50 of the first unidirectional group 71 and the second unidirectional group 72 are unidirectional fabrics. The fiber direction of the first unidirectional group 71 is different from that of the second unidirectional group 72. The basis weight of the first unidirectional group 71 is 30% to 75% of the total basis weight of the at least three fiber composite material layers 50. That is, the basis weight of the first unidirectional group 71 is 30% to 75% of the total basis weight of all fiber composite material layers 50 in the composite board 70.

[0155] The basis weight of the first unidirectional group 71 is the total basis weight of the multilayer fiber composite material layer 50 constituting the first unidirectional group 71. The fiber direction of the first unidirectional group 71 can be understood as the fiber direction of the fiber composite material layer 50 in the first unidirectional group 71. The fiber direction of the second unidirectional group 72 can be understood as the fiber direction of the fiber composite material layer 50 in the second unidirectional group 72.

[0156] For example, the composite panel 70 may include six fiber composite material layers 50. In other embodiments, the number of fiber composite material layers 50 may be more or less than six.

[0157] For example, the composite board 70 may include a first fiber composite material layer 51, a second fiber composite material layer 52, a third fiber composite material layer 53, a fourth fiber composite material layer 54, a fifth fiber composite material layer 55, and a sixth fiber composite material layer 56. All of these layers may be unidirectional fabrics. The first unidirectional assembly 71 may include the first fiber composite material layer 51, the third fiber composite material layer 53, and the fifth fiber composite material layer 55. The fiber orientation of the first fiber composite material layer 51, the third fiber composite material layer 53, and the fifth fiber composite material layer 55 may be [missing information - likely a specific orientation]. Figure 8 In the a1 direction, the second unidirectional group 72 may include a second fiber composite layer 52, a fourth fiber composite layer 54, and a sixth fiber composite layer 56, wherein the fiber directions of the second fiber composite layer 52, the fourth fiber composite layer 54, and the sixth fiber composite layer 56 can all be... Figure 8 In the a2 direction, the fiber direction of the first unidirectional group 71 (e.g.) Figure 8 The fiber direction of the middle a2 direction and the fiber direction of the second unidirectional group 72 (e.g., the direction of a2 direction) and the ... Figure 8 (The direction of a2 is different).

[0158] In some embodiments, the fiber direction of the first unidirectional group 71 and the fiber direction of the second unidirectional group 72 can be either a 0° direction or a 90° direction. For example, the fiber direction of the first unidirectional group 71 can be a 0° direction, and the fiber direction of the second unidirectional group 72 can be a 90° direction. Here, a 0° direction can be understood as the angle between the fiber direction and the reference direction being 0°, and a 90° direction can be understood as the angle between the fiber direction and the reference direction being 90°.

[0159] For example, the number of unidirectional fabric layers is six. In other embodiments, the number of unidirectional fabric layers may be more or less than six.

[0160] For example, the fiber arrangement of the first fiber composite layer 51, the second fiber composite layer 52, the third fiber composite layer 53, the fourth fiber composite layer 54, the fifth fiber composite layer 55 and the sixth fiber composite layer 56 can all be unidirectional.

[0161] In other embodiments, when the composite board 70 has at least four unidirectional fabrics, the fiber arrangement of a portion of the fiber composite material layer 50 in the composite board 70 can be unidirectional, and the fiber arrangement of another portion of the fiber composite material layer 50 can be woven. That is, a portion of the fiber composite material layer 50 in the composite board 70 can be unidirectional, and another portion of the fiber composite material layer 50 can be woven.

[0162] For example, the basis weight of the first unidirectional group 71 may be 35% of the total basis weight of all fiber composite material layers 50 in the composite panel 70. In other embodiments, the basis weight of the first unidirectional group 71 may also account for other proportions of the total basis weight of all fiber composite material layers 50 in the composite panel 70, such as 31%, 42%, 54%, 70%, etc.

[0163] In this embodiment of the application, when the composite board 70 has at least four layers of unidirectional fabric, by reasonably setting the total number of fiber composite material layers 50, the proportion of the basis weight of the first unidirectional group 71 to the total basis weight of all fiber composite material layers 50 in the entire composite board 70, and the fiber direction of each fiber composite material layer 50, the composite board 70 can have a large flexural modulus. For example, the flexural modulus of the two fiber composite material layers 50 that are furthest apart in the composite board 70 can be greater than or equal to 105 GPa at the same time, so that the composite board 70 has good bending resistance and good support performance.

[0164] Please continue reading Figure 7 and Figure 8 In some embodiments, the fiber direction of the first unidirectional group 71 is perpendicular to the fiber direction of the second unidirectional group 72, that is, the angle between the fiber direction of the first unidirectional group 71 and the fiber direction of the second unidirectional group 72 can be a right angle.

[0165] For example, the first unidirectional group 71 may include a first fiber composite material layer 51, a third fiber composite material layer 53, and a fifth fiber composite material layer 55, wherein the fiber orientations of the first fiber composite material layer 51, the third fiber composite material layer 53, and the fifth fiber composite material layer 55 can all be [missing information]. Figure 8 In the a1 direction, the second unidirectional group 72 may include a second fiber composite layer 52, a fourth fiber composite layer 54, and a sixth fiber composite layer 56, wherein the fiber directions of the second fiber composite layer 52, the fourth fiber composite layer 54, and the sixth fiber composite layer 56 can all be... Figure 8 In the a2 direction, the a1 direction is perpendicular to the a2 direction, and the angle between the a1 direction and the a2 direction can be a right angle.

[0166] In this embodiment of the application, by making the fiber direction of the first unidirectional group 71 perpendicular to the fiber direction of the second unidirectional group 72, the composite board 70 can obtain high strength and stiffness in both orthogonal directions. The layup design and manufacturing are simple, and the composite board 70 can have high structural stability and crack resistance.

[0167] For example, in actual implementation, considering process errors, the angle between the fiber direction of the first unidirectional group 71 and the fiber direction of the second unidirectional group 72 can be greater than or equal to 88° and less than or equal to 92°, and can be considered as the fiber direction of the first unidirectional group 71 and the fiber direction of the second unidirectional group 72 being perpendicular to each other.

[0168] In some embodiments, when the composite board 70 has at least four unidirectional fabrics, each fiber composite material layer 50 is a unidirectional fabric, the fiber directions of the two farthest fiber composite material layers 50 are different, and the fiber directions of adjacent fiber composite material layers 50 are perpendicular to each other.

[0169] For example, the angle between the fiber directions of the first fiber composite layer 51 and the second fiber composite layer 52 can be a right angle, the angle between the fiber directions of the second fiber composite layer 52 and the third fiber composite layer 53 can be a right angle, the angle between the fiber directions of the third fiber composite layer 53 and the fourth fiber composite layer 54 can be a right angle, the angle between the fiber directions of the fourth fiber composite layer 54 and the fifth fiber composite layer 55 can be a right angle, and the angle between the fiber directions of the fifth fiber composite layer 55 and the sixth fiber composite layer 56 can be a right angle.

[0170] In this embodiment of the application, by making the included angle between the fiber directions of adjacent fiber composite material layers 50 a right angle, the composite board 70 can obtain high strength and stiffness in both orthogonal directions. The layup design and manufacturing are simple, and the composite board 70 can have high structural stability and crack resistance.

[0171] In some embodiments, when each fiber composite layer 50 is a unidirectional fabric and the fiber directions of the two furthest fiber composite layers 50 are different, the included angle between the fiber directions of adjacent fiber composite layers 50 may include other angles besides 90°, such as 45°, 30°, etc.

[0172] When the composite board 70 has at least four unidirectional fabrics and the two furthest fiber composite material layers 50 are both unidirectional fabrics, in some embodiments the fiber directions of the two furthest fiber composite material layers 50 may be the same, except that they are different.

[0173] In some embodiments, when the composite board 70 has at least four unidirectional fabrics, the two furthest fiber composite material layers 50 in the composite board 70 are both unidirectional fabrics, one of the two furthest fiber composite material layers 50 has a layup angle of 90° and the other has a layup angle of 0°, and the layup angles of the remaining fiber composite material layers 50 include at least one of 0° and 90°.

[0174] For example, the layup angles of the first fiber composite layer 51, the second fiber composite layer 52, the third fiber composite layer 53, the fourth fiber composite layer 54, the fifth fiber composite layer 55, and the sixth fiber composite layer 56 can be in the order of 0°, 90°, 0°, 90°, 0°, 90°. In other embodiments, the layup angles of the first fiber composite layer 51, the second fiber composite layer 52, the third fiber composite layer 53, the fourth fiber composite layer 54, the fifth fiber composite layer 55, and the sixth fiber composite layer 56 can also be in the order of 90°, 0°, 90°, 0°, 90°, 0°.

[0175] In this embodiment of the application, the layup angle of each fiber composite material layer 50 is set to 0° or 90°, which can make the composite plate 70 have greater stiffness and strength in both the 0° and 90° directions. The composite plate 70 can also have a greater flexural modulus in both the 0° and 90° directions, which can meet the usage requirements of the upper cover plate 111 and the lower cover plate 112.

[0176] In other embodiments, when the composite board 70 has at least four unidirectional fabrics, the layup angles of the remaining fiber composite material layers 50 in the composite board 70, excluding the two furthest fiber composite material layers 50, may include other layup angles, such as 45°, in addition to 0° and 90°.

[0177] Please see Figure 9 , Figure 9 This is a cross-sectional schematic diagram of another composite board 70 provided in an embodiment of this application.

[0178] In some embodiments, when the composite board 70 has at least four layers of unidirectional fabric, at least one fiber composite material layer 50 in the composite board 70 may also have multiple layers of fiber layers 60 stacked together.

[0179] For example, at least one fiber composite material layer 50 in the composite panel 70, excluding the two furthest fiber composite material layers 50, has multiple fiber layers 60. For instance, the number of fiber composite material layers 50 is six, and the third fiber composite material layer 53, the fourth fiber composite material layer 54, and the fifth fiber composite material layer 55 each include two stacked fiber layers 60.

[0180] In other embodiments, the number of fiber composite material layers 50 having multiple fiber layers 60 in the composite board 70 may be more or less than four, in addition to being four layers.

[0181] For a description of the multilayer fiber layer 60 in the fiber composite layer 50, please refer to the relevant content in the previous description, so it will not be repeated here.

[0182] Please see Figure 10 and Figure 11 , Figure 10 The embodiment of this application provides a method for the middle tube 15 and the lower cover plate 112 to mate in the following way: Figure 4 A cross-sectional view along the MM direction. Figure 11 for Figure 10 A cross-sectional schematic diagram of the lower cover plate 112.

[0183] In some embodiments, the lower cover plate 112 has a composite material 70, one end of the middle tube 15 is embedded inside the lower cover plate 112, and the bottom surface of the middle tube 15 can be flush with the bottom surface of the lower cover plate 112.

[0184] For example, the middle tube 15 may include a first portion 151, a second portion 152, and a third portion 153 connected sequentially along the thickness direction of the centrifugal fan 10. The outer diameters of the first portion 151 and the third portion 153 are both smaller than the outer diameter of the second portion 152, and the first portion 151 and the third portion 153 form a stepped structure with the second portion 152. The lower cover plate 112 has a mating through hole 80 for inserting the middle tube 15. The inner wall of the mating through hole 80 has an annular groove 81 surrounding the center line of the mating through hole 80, and the second portion 152 fills the interior of the annular groove 81. In this way, the lower cover plate 112 can wrap around the middle tube 15, and a greater bonding force can be achieved between the lower cover plate 112 and the middle tube 15.

[0185] In this embodiment, when the lower cover plate 112 is formed from composite material 70, the lower cover plate 112 can wrap around one end of the middle tube 15 through multi-layer stacking, so that the bottom surface of the lower cover plate 112 can be flush with the bottom surface of the middle tube 15. The joint surface between the lower cover plate 112 and the middle tube 15 can be a complete plane. In scenarios where the lower cover plate 112 faces the display screen, film imprints caused by unevenness can be avoided. In addition, compared with the riveting scheme of the middle tube 15 and the lower cover plate 112, the lower cover plate 112 wrapping the middle tube 15 does not require an additional injection molding process to fill the gap between the middle tube 15 and the lower cover plate 112, and the bonding force between the lower cover plate 112 and the middle tube 15 is greater than the bonding force under the riveting scheme. Furthermore, the flatness of the joint between the lower cover plate 112 and the middle tube 15 when the lower cover plate 112 wraps the middle tube 15 is better than the flatness of the scheme of filling the gap between the middle tube 15 and the lower cover plate 112 by injection molding.

[0186] Please see Figures 12 to 15 , Figure 12 This is a schematic diagram of a reference stack 1 provided in an embodiment of this application. Figure 13 This is a top view schematic diagram of the first stack 2 and the middle tube 15 in accordance with an embodiment of this application. Figure 14 for Figure 13 A cross-sectional view along the AA direction. Figure 15 This is a top view schematic diagram showing the cooperation between the lower cover plate 112 and the middle tube 15 according to an embodiment of this application. Figure 16 for Figure 15 A cross-sectional view along the BB direction.

[0187] In this embodiment, no particular limitation is made regarding how the lower cover plate 112 encloses the middle tube 15. For example, the first reference stack 1 can be laser-engraved according to the dimensions of the middle tube 15 to form a through hole (e.g., ...) for the middle tube 15 to be inserted into. Figure 12 As shown), the reference stack 1 may include one or more layers of fiber prepreg, each layer of prepreg may include fiber material and resin material, or the reference stack 1 may include at least one layer of fiber composite material 50; then, for Figure 12 The outer ring of the reference stack 1 shown is further laser-engraved to obtain... Figure 13 The first stack 2 is fitted with the middle tube 15, and the first stack 2 can fit tightly with the stepped structure formed by the first part 151 and the second part 152 on the middle tube 15 (e.g. Figure 13 As shown in the diagram, the second reference stack 1 is laser-engraved or otherwise processed according to the dimensions of the central tube 15, so that the second stack 3 forms an opening for the central tube 15 to be inserted, and the shape of the second stack 3 is the same as that of the first stack 2. Next, the second stack 3 and the first stack 2 are stacked together, and the second stack 3 can fit tightly with the stepped structure formed by the second part 152 and the third part 153 on the central tube 15. The second stack 3 and the first stack 2 are stacked together and form a through-hole. The lower cover plate 112 can wrap around one end of the central tube 15, and the central tube 15 and the lower cover plate 112 are tightly connected in both the radial and axial directions of the central tube 15. Finally, by hot pressing, the air in the first stack 2 and the second stack 3 is expelled and the resin material is accelerated to cure, completing the forming of the lower cover plate 112.

[0188] Please see Figures 16 to 18 , Figure 16 This is a cross-sectional view of another lower cover plate 112 before riveting to the middle tube 15, provided in an embodiment of this application. Figure 18 This is a cross-sectional view of another lower cover plate 112 and middle tube 15 after riveting, provided in an embodiment of this application.

[0189] In some embodiments, when the lower cover plate 112 is made of composite sheet 70, the middle tube 15 can also be riveted to the lower cover plate 112.

[0190] For example, the lower cover plate 112 can be formed by hot pressing of stacked materials and then laser engraving to meet the shape requirements. Then, riveting through holes can be formed on the lower cover plate 112, and the central tube 15 can be inserted into the riveting through holes on the lower cover plate 112 (e.g., ...). Figure 16 As shown), the middle tube 15 and the lower cover plate 112 are riveted together using a riveting process, resulting in the following: Figure 18 The structure shown.

[0191] Please see Figures 19 to 21 , Figure 19 This is a top view schematic diagram of another reference stack 1 provided in an embodiment of this application. Figure 20 This is a schematic diagram of the structure of a lower cover plate 112 provided in an embodiment of this application. Figure 21 This is a top view of a centrifugal fan 10 provided in an embodiment of this application.

[0192] In some embodiments, the manufacturing process of the upper cover plate 111 may involve providing a reference stack 1, which may have multiple layers of fiber composite material 50; however, the reference stack 1 is machined according to the external dimensions of the upper cover plate 111, for example, the air inlet 18 is laser-engraved, and the shape of the reference stack 1 is made to be the same as that of the upper cover plate 111 by cutting, and then canning (heating and pressurizing, curing epoxy resin) is performed to shape it, and finally the upper cover plate 111 is fixed to the side wall 113 by screws 100 to realize the assembly of the upper cover plate 111.

[0193] In addition to being connected to the side wall 113 by screws 100, the top cover plate 111 can also be connected by other means, such as heat fusion connection.

[0194] In some embodiments, the sidewall 113 may be integrally injection molded with the lower cover plate 112.

[0195] In some other embodiments, the sidewall 113 may also be fixedly connected to the lower cover plate 112 by means of screws 100.

[0196] Please see Figure 22 , Figure 22 This is an internal schematic diagram of another centrifugal fan 10 provided in an embodiment of this application.

[0197] In some embodiments, when the sidewall 113 and the lower cover plate 112 are integrally injection molded, the sidewall 113 may have a pressure relief hole 90. The pressure relief hole 90 has a first opening 91 and a second opening 92 spaced apart in the rotation direction of the impeller 12. The first opening 91 communicates with the interior of the volute 11, and the second opening 92 communicates with the exterior of the volute 11. The pressure relief hole 90 is located along the rotation direction of the impeller 12 (e.g., ...). Figure 22(in the P direction), the second opening 92 is located behind the first opening 91.

[0198] In this embodiment, when the sidewall 113 is connected to the lower cover plate 112 by injection molding, stress concentration can be avoided and stress can be released by providing the stress relief hole 90. In addition, by placing the second opening 92 behind the first opening 91, aerodynamic performance loss can be reduced.

[0199] It should be noted that all the above figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between the components in the figures are not intended to limit the actual product of this application.

[0200] The above are merely some embodiments and implementation methods of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A centrifugal fan (10), characterized in that, include: The volute (11) includes an upper cover plate (111) and a lower cover plate (112) spaced apart along the thickness direction of the centrifugal fan (10). At least one of the upper cover plate (111) and the lower cover plate (112) includes a composite material plate (70). The composite material plate (70) includes at least three fiber composite material layers (50) arranged side by side along the thickness direction of the centrifugal fan (10). The fiber composite material layers (50) are made of fiber material and resin material. The fiber directions of adjacent fiber composite material layers (50) are different. At least three of the at least three fiber composite material layers (50) are unidirectional fabrics. When the composite board (70) has three layers of the unidirectional fabric, the total basis weight of the two unidirectional fabrics furthest apart is 20% to 25% of the total basis weight of the at least three fiber composite material layers (50); When the composite board (70) has at least four layers of the unidirectional fabric, the composite board (70) includes a first unidirectional group (71) and a second unidirectional group (72). Both the first unidirectional group (71) and the second unidirectional group (72) include multiple layers of the fiber composite material (50) with the same fiber direction. The fiber composite material (50) of the first unidirectional group (71) and the second unidirectional group (72) are both unidirectional fabrics. The fiber direction of the first unidirectional group (71) is different from that of the second unidirectional group (72). The basis weight of the first unidirectional group (71) is 30% to 75% of the total basis weight of the at least three layers of fiber composite material (50).

2. The centrifugal fan (10) according to claim 1, characterized in that, Each layer of the fiber composite material (50) is the unidirectional fabric.

3. The centrifugal fan (10) according to claim 2, characterized in that, The fiber directions of adjacent fiber composite layers (50) are perpendicular to each other.

4. The centrifugal fan (10) according to any one of claims 1-3, characterized in that, The fiber direction of the first unidirectional group (71) is perpendicular to the fiber direction of the second unidirectional group (72).

5. The centrifugal fan (10) according to any one of claims 1-4, characterized in that, When the composite board (70) has at least four layers of the unidirectional fabric, in the composite board (70), the two furthest fiber composite material layers (50) are both the unidirectional fabric, one of the two furthest fiber composite material layers (50) has a layup angle of 90° and the other has a layup angle of 0°, and the layup angle of the remaining fiber composite material layers (50) includes at least one of 0° and 90°.

6. The centrifugal fan (10) according to any one of claims 1-3, characterized in that, When the composite board (70) has three layers of the unidirectional fabric, in the composite board (70), the two furthest fiber composite material layers (50) are both the unidirectional fabric, the layup angle of the two furthest fiber composite material layers (50) is a first angle, and the layup angle of the remaining fiber composite material layers (50) is a second angle. The first angle includes one of 0° and 90°, and the second angle includes the other of 0° and 90°.

7. The centrifugal fan (10) according to any one of claims 1-6, characterized in that, At least one of the at least three fiber composite material layers (50) includes multiple fiber layers (60) stacked along the thickness direction of the centrifugal fan (10). The material of the fiber layer (60) includes the resin material and the fiber material. The fiber arrangement of adjacent fiber layers (60) is the same, and the fiber direction of adjacent fiber layers (60) is the same.

8. The centrifugal fan (10) according to any one of claims 1-7, characterized in that, The resin material content in the fiber composite layer (50) is greater than or equal to 20 wt% and less than or equal to 40 wt%.

9. The centrifugal fan (10) according to any one of claims 1-8, characterized in that, The fiber material content in the fiber composite layer (50) is greater than or equal to 10 wt% and less than or equal to 80 wt%.

10. The centrifugal fan (10) according to any one of claims 1-9, characterized in that, Each of the fiber composite material layers (50) has one of the fiber materials; or, Each of the fiber composite material layers (50) has a variety of different fiber materials; or, A portion of the at least three-layer fiber composite material layer (50) has one of the fiber materials, and another portion has multiple different fiber materials.

11. The centrifugal fan (10) according to any one of claims 1-10, characterized in that, The composite plate (70) includes at least four material layers stacked along the thickness direction of the centrifugal fan (10), at least three of the at least four material layers being the fiber composite material layer (50), and at least one of the at least four material layers being a metal material layer.

12. The centrifugal fan (10) according to any one of claims 1-11, characterized in that, The lower cover plate (112) has the composite material (70) and the flexural modulus of the lower cover plate (112) is greater than or equal to 105 GPa, and / or the upper cover plate (111) has the composite material (70) and the flexural modulus of the upper cover plate (111) is greater than or equal to 105 GPa.

13. The centrifugal fan (10) according to any one of claims 1-12, characterized in that, The lower cover plate (112) has the composite plate (70); The centrifugal fan (10) also includes a central tube (15), which is located inside the volute (11). One end of the central tube (15) is embedded inside the lower cover plate (112), and the bottom surface of the central tube (15) is flush with the bottom surface of the lower cover plate (112).

14. The centrifugal fan (10) according to claim 13, characterized in that, The central tube (15) includes a first part (151), a second part (152) and a third part (153) connected sequentially along the thickness direction of the centrifugal fan (10). The outer diameter of the first part (151) and the outer diameter of the third part (153) are both smaller than the outer diameter of the second part (152). The first part (151) and the third part (153) form a stepped structure with the second part (152). The lower cover plate (112) has a mating through hole (80) for insertion of the middle tube (15), the inner wall of the mating through hole (80) has an annular groove (81) surrounding the center line of the mating through hole (80), and the second part (152) fills the interior of the annular groove (81).

15. The centrifugal fan (10) according to any one of claims 1-14, characterized in that, The centrifugal fan (10) also includes an impeller (12), which is disposed inside the volute (11) and rotatably connected to the volute (11); The volute (11) also includes a sidewall (113), which is disposed between the lower cover plate (112) and the upper cover plate (111) and is fixedly connected to the upper cover plate (111) and the lower cover plate (112). The sidewall (113) and the lower cover plate (112) are integrally injection molded. The sidewall (113) has a pressure relief hole (90). The pressure relief hole (90) has a first opening (91) and a second opening (92) spaced apart in the rotation direction of the impeller (12). The first opening (91) communicates with the inside of the volute (11), and the second opening (92) communicates with the outside of the volute (11). Along the rotation direction of the impeller (12), the second opening (92) is located behind the first opening (91).

16. The centrifugal fan (10) according to any one of claims 1-15, characterized in that, The resin material includes at least one of polyamide, polycarbonate, polyoxymethylene, polyphenylene sulfide, polyetheretherketone, polytetrafluoroethylene, polyethylene, polypropylene, polyvinyl chloride, polystyrene, epoxy resin, phenolic resin, urea-formaldehyde resin, unsaturated polyester resin, silicone resin, or polyimide resin.

17. The centrifugal fan (10) according to any one of claims 1-16, characterized in that, The fiber material includes at least one of carbon fiber, glass fiber, ceramic fiber, basalt fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, or polyester fiber.

18. An electronic device, characterized in that, Includes the centrifugal fan (10) as described in any one of claims 1-17.

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