TW202007867A - Fan blade structure and centrifugal fan - Google Patents

Abstract

The present invention relates to a fan blade structure and a centrifugal fan. The centrifugal fan comprises a fan case having a first inlet and an outlet and a fan blade structure received in the fan case. The fan blade structure comprises a hub and a plurality of blades disposed at the outer edge of the hub. Each of the blades has a first portion and a second portion. A virtual line extends vertically between the first portion and the second portion. The surface area of the first portion is larger than or smaller than that of the second portion. An outside space which is not vertical to a first inlet plane around the first inlet is formed between one side of the second portion of each of the blades and the inner side of the side wall of the fan case.

Description

Fan blade structure and centrifugal fan

The invention relates to a fan blade structure and a centrifugal fan, in particular to a fan blade structure and a centrifugal fan that can improve the smoothness of the flow field and enhance the overall efficiency of the centrifugal fan.

The current electronic industry is developing rapidly, and the performance of electronic components is constantly improving. As the operation speed is faster, the heat generated by it will generate relatively large amount of heat. If the heat cannot be exhausted and deheated immediately, the computing performance of the electronic component will be If it is lowered, it will cause burnout in severe cases, so it is used as a heat dissipation through a centrifugal fan in a limited system space. Please refer to the drawings 1, 2A and 2B. The conventional centrifugal fan 1 mainly includes a frame 11 and a blade 12. The frame 11 has an air inlet 13 at its upper 111 and lower 112 respectively, which are connected The side edges 113 of the upper 111 and the lower 112 have an air outlet 14, and the air inlet surface 13 a where the air inlet 13 of the upper 111 and the lower 112 is located is the same size, and the side 113 is respectively opposite to the upper 111 and the lower 112 It is vertical, and an accommodating space 114 is provided in the frame 11 for accommodating the fan blade 12, a flow path 15 is formed between the fan blade 12 and the side 113, the flow path 15 and the air inlet 13 of the upper 111 ( Or the upper air inlet surface 13a (or the lower air inlet surface 13a) where the air inlet 13) of the lower 112 is located is perpendicular. The fan blade 12 includes a hub 121 and a plurality of blades 122 disposed on the outer side of the hub 121. The blades 122 move away from the side 1211 of the hub 121 and above the upper 111 (or lower 112) corresponding to the frame 11. The wind surface 13a (or the lower air inlet surface 13a) is perpendicular. Therefore, during operation, the surrounding blades 122 passing through the blade 12 rotate to drive the surrounding air flow, and the axial airflow entering from the air inlet 13 is diverted to the radial airflow along the hub, and then discharged from the air outlet 14. The size of the centrifugal fan 1 in general systems (such as notebook computers, smart mobile phones, in-vehicle systems, All-in-One (AIO), mini system (mini system) or IPAD) is mainly selected based on the system It is difficult to select the centrifugal fan 1 size for the shortest height of the shortest side, but for irregular systems, it is very difficult to choose the centrifugal fan 1, two cases often occur: the first case is that the fan size will interfere with the internal system. Electronic components or other devices, such as irregular systems, the shortest side height can be suitable for use as a 3-inch centrifugal fan, but it interferes with the internal electronic components or other devices (such as heat dissipation devices or hard disk devices) or the shape of the system , Making it impossible to use a centrifugal fan of a more suitable size; the second case is that the size of the fan is small, which will result in insufficient performance (such as insufficient air volume to meet the heat dissipation requirements), making the fan the same as the above, which is equivalent to wasting the previous capacity. The system space of the fan, for example, the irregular system is affected by the interference of internal electronic components or other devices, so that only a smaller 1 inch centrifugal fan can be used, but the air volume blown by the 1 inch centrifugal fan is not enough to fast the entire system. Heat dissipation to cause poor overall system heat dissipation performance.

An object of the present invention is to provide a fan blade structure and a centrifugal fan that can improve fan efficiency. Another object of the present invention is to provide a fan blade structure and a centrifugal fan that can increase the area of a plurality of blades to effectively increase the air volume. Another object of the present invention is to provide a structural design with different sizes by changing the shape of a casing and the first and second air inlets thereon to improve the flow field conditions (such as the smoothness of the flow field), and then to Centrifugal fan to effectively improve heat dissipation efficiency. Another object of the present invention is to provide a fan that can design the shape of the centrifugal fan and the shape of a blade flow path between the plurality of blades in the system according to the needs of the system, so as to effectively make full use of the space in the system and improve the heat dissipation efficiency of the fan Leaf structure and centrifugal fan. In order to achieve the above object, the present invention is to provide a fan blade structure which is applied to a centrifugal fan. The fan blade structure includes a hub and a plurality of blades, the blades are provided on the outer peripheral side of the hub, the Each blade has a first part and a second part, there is a vertically extending virtual straight line between the first part and the second part, the second part extends outward from one end of the first part adjacent to the virtual straight line, And the surface area of the first part is larger or smaller than the surface area of the second part; through the design of the fan blade structure of the present invention, the heat dissipation effect is effectively achieved. The invention also provides a centrifugal fan, which includes a casing and a fan blade structure, the casing is provided with an upper cover, a base and a shaft seat, the upper cover is provided on the base, and the upper cover and the base jointly define a volume The accommodating space of the shaft seat is provided. A first air inlet is opened on the upper cover or the base and communicates with the accommodating space. The base is provided with a bottom plate and a side wall extending from the bottom plate. The side wall is provided with at least An air outlet, the at least one air outlet communicates with the accommodating space, the fan blade structure is pivotally provided with the shaft seat in the accommodating space, the fan blade structure includes a hub and a plurality of blades, the blades are provided in On the outer peripheral side of the hub, each blade has a first part and a second part, a virtual straight line extending vertically between the first part and the second part, the second part from the second One end of one part extends outward, and the surface area of the first part is larger or smaller than the surface area of the second part, and between the side of the second part of the blades and the inside of the side wall facing the shell An outside space where the first air inlet surface is not perpendicular to the air inlet; by the design of the centrifugal fan of the present invention, the effect of air volume can be effectively improved, and the flow field condition can also be effectively improved, thereby effectively improving fan efficiency and promotion Cooling efficiency.

The above objects, structural and functional characteristics of the present invention will be described based on the preferred embodiments of the accompanying drawings. The present invention is a fan blade structure and a centrifugal fan. Please refer to FIG. 3A for a schematic perspective view of the fan blade structure of the first embodiment of the present invention; FIG. 3B is a schematic cross-sectional view taken along line AA in FIG. 3A; FIG. 4B is a schematic diagram of another embodiment of the fan blade structure of the first embodiment of the present invention. The fan blade structure 2 is applied to a centrifugal fan 3 (as shown in FIG. 5). The fan blade structure 2 includes a hub 20 and a plurality of blades 21. The blades 21 are looped on the outer peripheral side of the hub 20. Each blade 21 has a first portion 211 and a second portion 212. A virtual straight line L extending vertically is provided between the first portion 211 and the second portion 212. One end of one part 211 extends outwards. In this embodiment, the surface area of the first part 211 is greater than the surface area of the second part 212, but it is not limited to this. In specific implementation, the surface area of the first part 211 can also be designed Less than the surface area of the second portion 212. The first part 211 has a top edge 2111 and a bottom edge 2113. In this embodiment, the top edge 2111 and the bottom edge 2113 are parallel, and one end of the top edge 2111 and the bottom edge 2113 is connected to the outer periphery of the hub On the side, the other ends of the top edge 2111 and the bottom edge 2113 are away from the outer peripheral side of the hub, the second portion 212 has a first edge 2121 and a second edge 2122, and the first edge 2121 extends from the top edge 2111 The other end of the second side is inclined outward (such as downward and outward) to connect one end of the second side 2122, the other end of the second side 2122 is connected to the other end of the horizontally adjacent bottom side 2113, and the virtual straight line L From the junction of the first side 2121 and the other end of the top side 2111, it extends vertically down to the corresponding bottom side 2113, so that the first and second sides 2121, 2122 of the second part 212 correspond to the virtual straight line L Consists of a triangular shape. It can be seen from FIG. 3A that the surface area (or surface area) of the first part is the area of all the surfaces of the first part 211 (including the top side 2111 surface, the bottom side 2113 surface, and the two side surfaces of the first part 211) And, the surface area (or surface area) of the second part 212 is the sum of the areas of all the surfaces of the second part 212 (including the first and second sides 2121, 2122 and the two side surfaces of the second part 212) . In one embodiment, referring to FIG. 4A, the first side 2121 may also be designed to extend outwardly from the other end of the top side 2111 (eg, downward and outward) to connect one end of the second side 2122, the The other end of the second side 2122 obliquely connects the other end of the adjacent bottom side 2113, and the first and second sides 2121, 2122 of the second part 212 and the corresponding virtual straight line L are formed in a triangular shape. In another embodiment, referring to FIG. 4B, the first and second sides 2121 and 2122 of the second part 212 are designed to be irregularly wavy. Moreover, each blade 21 is provided with a windward surface 214 and a pair of leeward surfaces 215 corresponding to the windward surface 214. The windward surfaces 214 and the leeward surfaces 215 are respectively disposed on both sides of the blade 21, during the operation of the blade structure 2 (For example, if it rotates counterclockwise), one side of the blade structure 2 facing the direction of rotation is the windward surface 214, and the other side is the leeward surface 215, and the windward surface 214 is located in front of the leeward surface 215. In addition, the windward surface 214 defines a first windward surface area 2141 and a second windward surface area 2142 that tapers outward from the first windward surface area 2141. The first and second windward surface areas 2141, 2142 are located at the One side surface of the first and second parts 211, 212, that is, the first windward surface area 2141 is located between the virtual straight line L and the outer peripheral side of the hub 20, and the second windward surface The area 2142 is located on a side face of the second portion 212 between the virtual straight line L and the first and second sides 2121, 2122, and the shape of the first windward area 2141 of the first portion 211 and the second portion 212 The shape of the second windward surface area 2142 is different. For example, the shape of the first windward surface area 2141 of the first portion 211 is rectangular, and the shape of the second windward surface area 2142 of the second portion 212 is triangular The shape of the blade 21 is a trapezoidal shape, but the shape of the blade 21 is not limited thereto. The leeward surface 215 defines a first leeward surface area 2151 and a second leeward surface area 2152 tapering outward from the first leeward surface area 2151. The first and second windward surface areas 2141, 2142 correspond to the first 2nd leeward surface area 2151, 2152, the first and second leeward surface areas 2151, 2152 are located on the other side of the first and second portions 211, 212, respectively, the first leeward surface area 2151 is located on the virtual straight line L and With respect to the other side of the first portion 211 between the outer peripheral sides of the hub 20, the second leeward surface area 2152 is located between the virtual straight line L and the second portion 212 between the first and second sides 2121, 2122 A side surface, and the shape of the first leeward surface area 2151 of the first portion 211 is different from the shape of the second leeward surface area 2152 of the second portion 212, for example, the shape of the first leeward surface area 2151 of the first portion 211 is If it is rectangular, the shape of the second lee surface area 2152 of the second portion 212 is, for example, triangular. With continued reference to FIGS. 3A and 3B, the hub 20 is provided with a connecting portion 201 that is provided on the bottom side 213 of the blades 21, and the connecting portion 201 connects the peripheral portions of the hub 20 along the outer peripheral side The bottom side 213 of the blade 21 forms a ring body, and a blade flow channel 216 is formed between the blades 21. The blade flow channel 216 is used to flow the air flow (ie, air fluid) toward the radial direction of the hub 20. The shape of the blade flow path 216 between the two blades 21 is the same as the shape of any facing blade 21, if the shape of each blade 21 is a trapezoid, the blade flow between the two blades 21 at this time The shape of the channel 216 will be the same as a trapezoid shape. In one embodiment, the shape of the blade 21 may be an irregular shape. In this case, the shape of the blade flow path 216 between the two blades 21 may also be an irregular shape. In another embodiment, the hub 20 can also omit the connecting portion 201. Therefore, through the structural design in which the shape of the blade flow channel 216 changes as the shape of the blade 21 changes, the blade flow channels 216 can change the outflow air flow field, so that the air flow in the blade flow channels 216 is more Smooth outflow, which effectively improves the effect of wind pressure. In addition, the second windward surface area 2142 and the second leeward surface area 2152 of these blades 21 effectively increase the overall surface area of the blade 21 and enlarge the area of the blade flow channel 216, so that the effect of increasing the air volume is effectively achieved. Therefore, with the design of the fan blade structure 2 of the present invention, the effect of increasing the air volume and pressure is effectively achieved, and the effect of improving heat dissipation is also effectively achieved. Please refer to FIG. 5 which is a perspective schematic view of a fan blade structure according to a second embodiment of the invention; FIG. 5A is a schematic cross-sectional view along BB of FIG. 5; FIG. 5B is an implementation of a fan blade structure according to a second embodiment of the invention Schematic diagram of the aspect; FIG. 5C is a schematic diagram of another embodiment of the fan blade structure according to the second embodiment of the present invention. The structure and connection relationship of the fan blade structure of the present example are the same as the structure and connection relationship of the fan blade of the foregoing first embodiment, so they will not be repeated here. In this embodiment, the first part 211 of the foregoing first embodiment further includes a side 2112, and the second part 212 further includes a third side 2123 connected to the first and second sides 2121, 2122. The first part 211 has the top side 2111, the bottom side 2113, and a side 2112. One end of the side 2112 is connected to the other end of the top side 2111. The second part 212 has the first side 2121 and the second side 2122. A third side 2123 connected to one end of the first and second sides 2121, 2122, and the other end of the first and second sides 2121, 2122 respectively connects the other end of the side 2112 and the other end of the bottom side 2113. It can be seen from FIG. 5 that the surface area of the first portion 211 is the area of all surfaces of the first portion 211 (including the top edge 2111 surface, the bottom edge 2113 surface, the side edge 2112 surface, and the two side surfaces of the first portion 211) And, the surface area of the second part 212 is the sum of the surfaces of all the surfaces of the second part 212 (including the first, second, and three sides 2121, 2122, and 2123 surfaces and the two side surfaces of the second part 212). The first windward surface area 2141 and the first leeward surface area 2151 of the windward surface 214 of each blade 21 are respectively located on one side and the other side of the first portion 211 between the virtual straight line L and the outer peripheral side of the hub 20 , The second windward surface area 2142 and the second leeward surface area 2152 are respectively located on one side and the other side of the second portion 212 between the virtual straight line L and the first, second, and third sides 2121, 2122, 2123 , And the shape of the first windward surface area 2141 (or the first leeward surface area 2151) of the first portion 211 is different from the shape of the second windward surface area 2142 (or the second leeward surface area 2152) of the second portion 212 For example, the shape of the first windward surface area 2141 (or the first leeward surface area 2151) of the first portion 211 is rectangular, and the second windward surface area 2142 (or the second leeward surface area 2152) of the second portion 212 ) Has a rectangular shape. The shape of the blade flow path 216 between the two pairs of blades 21 is the same as the shape of any facing blade 21. In one embodiment, referring to FIG. 5B, one end of the side 2112 of the first portion 211 is connected to the other end of the top edge 2111 to one end of the side 2112 of the first portion 211 is connected to the other end of the bottom edge 2111 , And the other ends of the first and second sides 2121, 2122 are respectively connected to the other end of the top side 2111 and the other end of the side 2112. In another embodiment, referring to FIG. 5C, one side 2112 of the first part 211 is redesigned to include two sides 2112. One end of the two sides 2112 is connected to the other ends of the top side 2111 and the bottom side 2113, respectively. The other ends of the first and second sides 2121 and 2122 are respectively connected to the other ends of the two side sides 2112. Therefore, in the above embodiments, through the structural design in which the shape of the blade flow channel 216 changes as the shape of the blade 21 changes, the blade flow channels 216 can change the outflow flow field of the air flow and let the air flow in the blade flow channels When it flows out of 216, it flows out more smoothly, thereby effectively improving the effect of wind pressure. In addition, the second windward surface area 2142 and the second leeward surface area 2152 of these blades 21 effectively increase the overall surface area of the blade 21 and enlarge the area of the blade flow channel 216, so that the effect of increasing the air volume and wind pressure is effectively achieved, and Also effectively improve the cooling effect. Please refer to FIG. 6 for a perspective exploded view of a centrifugal fan according to a third embodiment of the present invention; FIG. 7A for a perspective combined view of a centrifugal fan according to a third embodiment of the present invention; FIG. 7B for a cross-sectional schematic view of CC in FIG. 7A , And supplemented by drawing 3A. The centrifugal fan 3 includes a casing 31 and a blade structure 2, wherein the structure and connection relationship and efficacy of the blade structure 2 are the same as those of the blade structure 2 of the first embodiment described above, so I will not repeat them here. In addition, in this embodiment, the casing 31 is generally described as a ladder shape, but it is not limited to this. The casing 31 is provided with an upper cover 311, a base 312, a first air inlet 315, and a location where the first air inlet 315 is located. A first air inlet surface 315a, at least one air outlet 317 and a shaft seat 313, the upper cover 311 is set on the base 312, and the upper cover 311 and the base 312 jointly define an accommodating space 314, the accommodating space 314 is used for accommodating the shaft seat 313 and the fan blade structure 2, the first air inlet 315 is opened on the upper cover 311 or the base 312 of the casing 31, and the first air inlet 315 of this embodiment is opened through the The upper cover 311 communicates with the accommodating space 314, the first air inlet surface 315a and the outer side of the upper cover 311 are on the same horizontal plane, the first air inlet surface 315a and the second portion 212 corresponding to the second portion of the blade 21 One side 2121 is not perpendicular. The base 312 has a bottom plate 3121 and a side wall 3122 extending from the bottom plate 3121. The shaft seat 313 is located at the center of the bottom plate 3121 in the accommodating space 314 and corresponds to an axis corresponding to the fan blade structure 2 The core 23 is pivotally arranged, and the hub 20 of the fan blade structure 2 has a magnetic member 203 inductively excited with the stator 33 correspondingly sleeved on the shaft seat 313. In this embodiment, the side wall 3122 indicates that the upper edge of the side wall 3122 is connected to the side corresponding to the upper cover 311, and the upper end of the side wall 3122 is connected to the side corresponding to the upper cover 311. The upper cover 311 and the bottom plate 3121 of the body 31 are not perpendicular to the side wall 3122, respectively. The cross-sectional shape of the side wall 3122 of the casing 31 in this embodiment is the same as the cross-sectional shape of the first side 2121 corresponding to the second portion 212 of the blades 21, such as the cross-sectional shape of the side wall 3122 of the casing 31 The cross-sectional shape of the first side 2121 of the blade 21 is inclined in the same direction (or stepped or other shapes), so that the overall shape of the shell 31 is irregular. The surface area of the upper cover 311 (that is, the total area of all surfaces of the upper cover 311) is smaller than the surface area of the bottom plate 3121 (that is, the total area of all surfaces of the bottom plate 3121). In an alternative embodiment, the cross-sectional shape of the side wall 3122 of the casing 31 may be redesigned to be the same as the cross-sectional shape of the first and second sides 2121 and 2122 of the second portion 212 of the blades 21. In addition, the side wall 3122 is provided with the aforementioned air outlet 317 which communicates with the accommodating space 314 and is used to exhaust the air flow in the housing 31, and the inside of the side wall 3122 of the housing 31 faces the An outer space 318 is formed between one side (such as the first side 2121) of the second portion 212 of the blades 21 of the fan structure 2, the outer space 318 and the first air inlet surface 315 a where the first air inlet 315 is located Not perpendicular, and the cross-sectional shape of the outer space 318 in this embodiment is inclined (as shown in FIG. 7B), but it is not limited to this. In specific implementation, the outer space 318 may follow the shell of the centrifugal fan 3 The outer shape of the body 31 changes to change the shape. Therefore, the centrifugal fan 3 of the present invention is applied to systems (such as notebook computers, smart mobile phones, in-vehicle systems, all-in-one (AIO), mini systems), smart wearable devices or IPAD; (Not shown in the figure), the casing 31 of the centrifugal fan 3 can be changed with the system to change the outer shape of the casing 31 (such as a trapezoidal shape), and then the shape of the blade 21 of the blade structure 2 (such as a trapezoidal shape) and The shape of the outer space 318 (that is, the cross-sectional shape of the outer space 318) will also change as the outer shape of the housing 31 changes, so that the structure of the centrifugal fan 3 can be effectively used and can be applied to various systems to make full use of Space within the system. For example, the space for placing the centrifugal fan 3 in a system is preferably a centrifugal fan 3 with a size as large as 4 inches, but because a part of the centrifugal fan 3 (such as the upper right half of the centrifugal fan 3) is affected by the electronic components or Interference of other devices (such as radiators or hard disks) or the appearance of the system, at this time, the shape of the casing 31 of the centrifugal fan 3 of the present invention changes. For example, the side wall 3122 of the casing 31 slopes upward and inward toward the upper cover 311 and The surface area of the upper cover 311 and the bottom plate 3121 are different, so as to effectively avoid the interfered parts, so that the system can still use a 4-inch centrifugal fan 3 for better heat dissipation, so it can effectively improve the performance of the system. The casing 31 is provided with a pair of second air inlets 316 corresponding to the first air inlet 315 and a second air inlet surface 316a where the second air inlet 316 is located, and the second air inlet 316 penetrates the bottom plate 3121 And communicate with the accommodating space 314, and the second air inlet surface 316a and the outer side of the bottom plate 3121 are on the same horizontal plane, and the second air inlet surface 316a is not perpendicular to the first side of the second portion 212 of the blades 21 2121 and the outer space 318, and in this embodiment, the first air inlet surface 315a is smaller than the second air inlet surface 316a and the first air inlet 315 is smaller than the second air inlet 316, but it is not limited thereto. Therefore, the design with different sizes of the first air inlet surface 315a of the upper cover 311 and the second air inlet surface 316a corresponding to the bottom plate 3121 can improve the smoothness of the flow field and effectively increase the air volume. In an alternative embodiment, the surface area of the upper cover 311 may be modified to be larger than the surface area of the bottom plate 3121, and the first air inlet surface 315a may be larger than the second air inlet surface 316, and the first air inlet 315 may be larger or smaller than the second air inlet. 316. In another alternative embodiment, referring to FIGS. 5A, 5B, and 7B, the cross-sectional shape of the side wall 3122 of the housing 31 of FIG. 7B is redesigned to be substantially stepped, so that the overall shape of the housing 31 is irregular, and the fan blade The structure 2 is redesigned as the fan blade structure 2 of the second embodiment described above, so that the outer space 318 is redesigned to be formed inside the side wall 3122 of the casing 31 and the third side facing the second portion 212 of the blades 21 Between 2123 and the side 2112 of the first part 211, or referring to FIGS. 5C and 7B, the cross-sectional shape of the side wall 3122 of the housing 31 of FIG. 7B is redesigned to be substantially convex, so that the overall shape of the housing 31 is irregular , And the outer space 318 is redesigned and formed between the inner side of the side wall 3122 of the casing 31 and the third side 2123 facing the second portion 212 of the blades 21 and the second side 2112 of the first portion 211, and the The outer space 318 is not perpendicular to the first and second air inlet surfaces 315a and 316a. Therefore, the structural design of the centrifugal fan 3 of the present invention effectively improves the efficiency of the centrifugal fan 3 and the heat dissipation effect, and also effectively solves the problem that a centrifugal fan of a suitable size cannot be selected in the conventional system.

2‧‧‧Fan blade structure 20‧‧‧Wheel 201‧‧‧ Connection 203‧‧‧Magnetic parts 21‧‧‧blade 211‧‧‧Part One 2111‧‧‧Top side 2112‧‧‧Side 2113‧‧‧Bottom 212‧‧‧Part Two 2121, 2122, 2123‧‧‧First, second, and third sides 214‧‧‧windward side 2141, 2142‧‧‧The first and second windward areas 215‧‧‧ Leeward 2151, 2152‧‧‧ First and second leeward areas 216‧‧‧blade flow channel 23‧‧‧Axis L‧‧‧Virtual straight line 3‧‧‧Centrifugal fan 31‧‧‧Housing 311‧‧‧Cover 312‧‧‧Base 3121‧‧‧Bottom plate 3122‧‧‧Sidewall 313‧‧‧Shaft seat 314‧‧‧accommodation space 315, 316‧‧‧ First and second air inlets 315a, 316a‧‧‧First and second wind inlet 317‧‧‧Outlet 318‧‧‧Outside space 33‧‧‧ Stator

Figure 1 is a schematic exploded view of the conventional art. Figure 2A is a schematic diagram of a conventional three-dimensional combination. Figure 2B is a schematic diagram of a conventional combined cross-section. FIG. 3A is a perspective schematic view of the fan blade structure according to the first embodiment of the invention. FIG. 3B is a schematic cross-sectional view taken along line A-A of FIG. 3A. FIG. 4A is a schematic diagram of an embodiment of the fan blade structure according to the first embodiment of the present invention. FIG. 4B is a schematic diagram of another embodiment of the fan blade structure according to the first embodiment of the present invention. Fig. 5 is a perspective schematic view of a fan blade structure according to a second embodiment of the invention. FIG. 5A is a schematic cross-sectional view taken along line B-B of FIG. 5 of the present invention. FIG. 5B is a schematic diagram of an embodiment of the fan blade structure according to the second embodiment of the present invention. FIG. 5C is a schematic diagram of another embodiment of the fan blade structure according to the second embodiment of the present invention. FIG. 6 is a schematic exploded perspective view of a centrifugal fan according to a third embodiment of the invention. FIG. 7A is a three-dimensional schematic diagram of a centrifugal fan according to a third embodiment of the invention. FIG. 7B is a schematic cross-sectional view taken along line C-C of FIG. 7A of the present invention.

2‧‧‧Fan blade structure

20‧‧‧Wheel

203‧‧‧Magnetic parts

21‧‧‧blade

211‧‧‧Part One

212‧‧‧Part Two

23‧‧‧Axis

L‧‧‧Virtual straight line

3‧‧‧Centrifugal fan

31‧‧‧Housing

311‧‧‧Cover

312‧‧‧Base

3121‧‧‧Bottom plate

3122‧‧‧Sidewall

313‧‧‧Shaft seat

315, 316‧‧‧ First and second air inlets

315a, 316a‧‧‧First and second wind inlet

318‧‧‧Outside space

33‧‧‧ Stator

Claims (19)

A fan blade structure is applied to a centrifugal fan. The fan blade structure includes: a hub and a plurality of blades, the blades are arranged on the outer peripheral side of the hub, each blade has a first part and a second part, There is a vertically extending virtual straight line between the first part and the second part, the second part extends outward from one end of the first part adjacent to the virtual straight line, and the surface area of the first part is larger or smaller than the second part Surface area. The blade structure as described in item 1 of the patent application scope, wherein the first part has a top edge and a bottom edge, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the top edge and the The other end of the bottom edge is away from the outer peripheral side of the hub, the second portion has a first edge and a second edge, the first edge extends outwardly from the other end of the top edge and connects to the end of the second edge, The other end of the second side is connected to the other end of the horizontally adjacent bottom side, and the virtual straight line extends vertically downward from the junction of the first side and the other end of the top side to the corresponding bottom side. The blade structure as described in item 1 of the patent application scope, wherein the first part has a top edge, a bottom edge and a side edge, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the The other ends of the top edge and the bottom edge are far from the outer peripheral side of the hub, one end of the side edge is connected to the other end of the top edge, the second portion has a first edge and a second edge, and a The third side is connected to one end of the two sides, and the other ends of the first and second sides are respectively connected to the other end of the side and the other end of the bottom side. The blade structure as described in item 1 of the patent application scope, wherein the first part has a top edge, a bottom edge and a side edge, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the The other ends of the top edge and the bottom edge are away from the outer peripheral side of the hub, one end of the side edge is connected to the other end of the bottom edge, the second portion has a first edge and a second edge, and a The third side is connected to one end of the two sides, and the other ends of the first and second sides are respectively connected to the other end of the top side and the other end of the side side. The blade structure as described in item 1 of the patent application scope, wherein the first part has a top edge, a bottom edge and two side edges, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the The other ends of the top edge and the bottom edge are away from the outer peripheral side of the hub. One end of the two side edges connects the other ends of the top edge and the bottom edge, respectively. The second portion has a first side and a second side and a The third side connected to one end of the first and second sides, and the other ends of the first and second sides are respectively connected to the other ends of the two side sides. The fan blade structure as described in item 1 of the patent application scope, wherein each blade is provided with a windward surface and a pair of leeward surfaces corresponding to the windward surface, the windward surface defines a first windward surface area and a windward surface from the first windward surface A second windward surface area that tapers outwards, the first and second windward surface areas are respectively located on one side of the first and second parts, the leeward surface defines a first leeward surface area and a The leeward surface area is a second leeward surface area that tapers outward. The first and second leeward surface areas are respectively located on the other sides of the first and second parts, and correspond to the first and second windward surface areas. The fan blade structure as described in item 1 of the patent application scope, wherein the blades form a blade flow channel between each other, the shape of the blade flow channel is the same as the shape of the corresponding blades, and the shape of the blade flow channel is one Trapezoidal or irregular shape. The fan blade structure as described in item 1 of the patent application scope, wherein the hub is provided with a connecting portion, the connecting portion is provided on the bottom side of the blades, and the connecting portion is connected to the outer peripheral side of the hub The bottom side of the blade forms an annulus. A centrifugal fan includes: a casing provided with an upper cover, a base and a shaft seat, the upper cover is provided on the base, and the upper cover and the base jointly define an accommodating space for accommodating the shaft seat, a first The air inlet is opened on the upper cover or the base and communicates with the accommodating space, the base is provided with a bottom plate and a side wall extending from the bottom plate, the side wall is provided with at least one air outlet, and the at least one air outlet communicates with the container Space; and a fan structure, which is pivotally provided with the shaft seat in the accommodating space, the fan structure includes a hub and a plurality of blades, the blade rings are provided on the outer peripheral side of the hub, each A blade has a first part and a second part, and there is a vertically extending virtual straight line between the first part and the second part, the second part extends outward from one end of the first part adjacent to the virtual straight line, and The surface area of the first portion is larger or smaller than the surface area of the second portion, and a first portion where the first air inlet is located is formed between one side of the second portion of the blades and the inner side of the side wall facing the shell Outside space where the wind inlet is not perpendicular. The centrifugal fan as described in item 9 of the patent application scope, wherein the first air inlet is opened through the upper cover, the first air inlet surface is not perpendicular to the side of the second part corresponding to the blades, the The side wall extends obliquely upward from the peripheral edge of the adjacent bottom plate toward the accommodating space and connects to correspond to the upper cover, and the shaft seat is disposed at the center of the bottom plate in the accommodating space. The centrifugal fan as described in item 10 of the patent application scope, wherein the casing is provided with a pair of second air inlets corresponding to the first air inlet and a second air inlet surface where the second air inlet is located, the second air inlet It penetrates through the bottom plate and communicates with the accommodating space. The second air inlet surface is not perpendicular to one side of the second part of the blades and the outer space. The centrifugal fan according to item 11 of the patent application scope, wherein the surface area of the upper cover is smaller than the surface area of the bottom plate, and the first air inlet surface is smaller than the second air inlet surface. The centrifugal fan as described in item 9 of the patent application scope, wherein the first part has a top edge and a bottom edge, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the top edge and the bottom edge The other end of the side is away from the outer peripheral side of the hub, the second part has a first side and a second side, the first side extends obliquely outward from the other end of the top side to connect one end of the second side, and The first side faces the inner side of the side wall of the housing, the other end of the second side connects to the other end of the horizontally adjacent bottom side, and the virtual straight line is connected to the other end of the top side from the first side The place extends vertically downwards to the corresponding bottom edge. The centrifugal fan according to item 9 of the patent application scope, wherein the first part has a top edge, a bottom edge and a side edge, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the top The other end of the edge and the bottom edge is away from the outer peripheral side of the hub, one end of the side edge is connected to the other end of the top edge, the second portion has a first edge and a second edge and a A third side connected to one end of the side, the other ends of the first and second sides respectively connect the other end of the side and the other end of the bottom side, and the inside of the side wall of the shell and the second side facing the blades The aforementioned outside space is formed between the third side of the part and the side of the first part. The centrifugal fan according to item 9 of the patent application scope, wherein the first part has a top edge, a bottom edge and a side edge, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the top The other end of the edge and the bottom edge is far from the outer peripheral side of the hub, one end of the side edge is connected to the other end of the bottom edge, the second part has a first edge and a second edge, and a first edge and a second edge A third side connected to one end of the side, the other ends of the first and second sides respectively connect the other end of the top side and the other end of the side, and the inside of the side wall of the shell and the second side facing the blades The aforementioned outside space is formed between the third side of the part and the side of the first part. The centrifugal fan as described in item 9 of the patent application scope, wherein the first part has a top edge, a bottom edge and two side edges, one end of the top edge and the bottom edge is connected to the outer peripheral side of the hub, the top The other ends of the edge and the bottom edge are far away from the outer peripheral side of the hub, one end of the two side edges are respectively connected to the other ends of the top edge and the bottom edge, the second part has a first edge and a second edge and a A third side connected to one end of the first and second sides, the other ends of the first and second sides are respectively connected to the other ends of the two side sides, and the inner side wall of the shell and the second part facing the blades The aforementioned outer space is formed between the third side of and the two sides of the first part. The centrifugal fan as described in item 9 of the patent application scope, wherein each blade is provided with a windward surface and a pair of leeward surfaces that should face the windward surface, the windward surface defines a first windward surface area and a first windward surface from the first windward surface A second windward surface area tapering outwards, the first and second windward surface areas are located on one side of the first and second parts respectively, the leeward surface defines a first leeward surface area and a leeward surface from the first leeward surface A second leeward surface area which is tapered outwards. The first and second leeward surface areas are respectively located on the other sides of the first and second parts, and correspond to the first and second windward surface areas. The centrifugal fan as described in item 9 of the patent application scope, wherein the blades form a blade flow path between each other, the shape of the blade flow path is the same as the shape of the corresponding blades, and the shape of the blade flow path is a trapezoid Or irregular shapes. The centrifugal fan according to item 9 of the patent application scope, wherein the hub is provided with a connecting portion provided on the bottom side of the blades, and the connecting portion connects the blades along the outer peripheral side with respect to the hub Forming a ring on the bottom side.

Images