FAN BLADE, FAN MOTOR, INFORMATION PROCESSING APPARATUS AND PROJECTOR

Abstract

To provide a fan blade capable of ensuring a sufficient amount of airflow and cooling effect even when the fan blade is made thin, a fan motor incorporating the fan blade, an information processing device equipped with the fan motor, and a projector equipped with the fan motor. [Solution] The fan blade 4 of the present invention is a fan blade 4 of a centrifugal fan, and comprises a plurality of upper blade portions 29 and a plurality of lower blade portions 44. The upper part of the upper blade portion 29 has an upper regulating plate portion 34 extending in the rotation direction F of the fan blade 4, and the lower part of the lower blade portion 44 has a lower regulating plate portion 51 extending in the rotation direction F of the fan blade 4. As the lower end portion 40 of the upper blade portion 29 and the upper end portion 57 of the lower blade portion 44 abut against each other, the upper blade portion 29, the upper regulating plate portion 34, the lower blade portion 44 and the lower regulating plate portion 51 form an approximately C-shape.

Description

[Technical field]

[0001] The present invention relates to a fan blade for a centrifugal fan, a fan motor incorporating the fan blade, an information processing device incorporating the fan motor, and a projector incorporating the fan motor. [Background technology]

[0002] 2. Description of the Related Art Centrifugal fans that are mounted in various electronic devices and blow air onto heat-generating bodies to cool them have been proposed (see, for example, Patent Document 1).

[0003] The centrifugal fans (38, 39) described in Patent Document 1 are mounted in electronic devices (10) such as notebook PCs, desktop PCs, tablet PCs, smartphones, game consoles, etc., but in recent years, there has been a demand for such electronic devices to be made thinner. In order to make electronic devices thinner, there is also a demand for the centrifugal fans mounted in the electronic devices to be made thinner. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2024-055133 Summary of the Invention [Problem to be solved by the invention]

[0005] However, simply making the centrifugal fan thinner reduces the amount of air blown per unit time, resulting in a problem that a sufficient cooling effect cannot be obtained.

[0006] Therefore, the present invention aims to solve the above problems and provide a fan blade that can ensure sufficient air flow and cooling effect even when made thin, a fan motor incorporating such a fan blade, an information processing device equipped with such a fan motor, and a projector equipped with such a fan motor. [Means for solving the problem]

[0007] The fan blade of the present invention is a fan blade for a centrifugal fan comprising a plurality of first blade portions and a plurality of second blade portions, wherein an upper portion of the first blade portion has a first regulating plate portion extending in the rotational direction of the fan blade, and a lower portion of the second blade portion has a second regulating plate portion extending in the rotational direction of the fan blade, and wherein the lower portion of the first blade portion abuts against the upper portion of the second blade portion, so that the first blade portion, the first regulating plate portion, the second blade portion and the second regulating plate portion form an approximately C-shape.

[0008] A fan motor according to the present invention comprises the above-mentioned fan blade, a casing that houses the fan blade, and a motor unit.

[0009] The information processing device of the present invention is characterized in that it comprises the above-mentioned fan motor as a cooling means.

[0010] A projector according to the present invention is characterized in that it includes the above-mentioned fan motor as a cooling means. Effect of the Invention

[0011] According to the present invention, a sufficient amount of air blowing and a sufficient cooling effect can be ensured. [Brief description of the drawings]

[0012] [Figure 1] 1 is a perspective view of a fan motor according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an exploded perspective view of an upper case of the fan motor according to the embodiment. [Diagram 3] FIG. 2 is an exploded perspective view of the fan motor according to the embodiment, showing an upper case and fan blades disassembled therefrom. [Figure 4] FIG. 2 is an upper perspective view of the fan blade of the embodiment. [Diagram 5] FIG. 2 is a perspective view of an upper blade body according to the embodiment. [Figure 6]FIG. 2 is a perspective view of a lower blade body and a yoke according to the embodiment. [Figure 7] FIG. 2 is a bottom perspective view of the fan blade of the embodiment. [Figure 8] FIG. 2 is a plan view of the fan blade of the embodiment. [Figure 9] 9 is a cross-sectional view taken along line AA in FIG. 8. [Figure 10] 9 is a cross-sectional view of FIG. 8 taken along line B-B. [Figure 11] 9 is a cross-sectional view taken along CC in FIG. 8 . [Figure 12] FIG. 2 is a front view of the fan blade of the embodiment. [Figure 13] 13 is a modified example of the upper blade portion and the lower blade portion of the same embodiment. [Figure 14] 13 shows another modified example of the upper blade portion and the lower blade portion of the same embodiment. [Figure 15] FIG. 13 is an explanatory diagram illustrating the position of a reinforcing plate portion of a conventional fan blade. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Not all of the configurations of the embodiments described below are essential requirements for the present invention.

[0014] Figure 1 shows the appearance of a fan motor 1, which is a centrifugal fan in one embodiment of the present invention. As shown in Figures 2 and 3, the fan motor 1 is configured to have an upper case 2, a lower case 3, and fan blades 4. The upper case 2 and the lower case 3 form a casing 5, which houses the fan blades 4.

[0015] The upper case 2, which is formed in a thin plate shape, is formed with a circular first air intake 6 that takes in air to the fan motor 1. In this embodiment, the first air intake 6 has a diameter D1 of 44 mm, but the diameter D1 can be changed depending on the device in which the fan motor 1 is mounted, the desired cooling performance, etc.

[0016] As shown in Figure 3, the lower case 3 is composed of a thin bottom plate portion 7, a wall portion 8 erected on the outer periphery of the bottom plate portion 7, a motor unit 9 fixed to the bottom plate portion 7, and wiring 10 for supplying power to the motor unit 9.

[0017] A motor unit 9 is disposed approximately in the center of the bottom plate 7. The motor unit 9 has a laminated core 11, a bearing portion 12 provided in the center of the laminated core 11, and a winding (not shown) wound around a plurality of (six in this embodiment) arm portions 13 of the laminated core 11. The bearing portion 12 is formed with an insertion hole 14 through which a shaft portion 24 (see FIG. 7) fixed to the fan blade 4 by laser welding is inserted. A mounting plate 15 is fixed to the bottom plate 7, and the motor unit 9 is attached to this mounting plate 15. A permanent magnet 26, which will be described later, also constitutes the motor unit 9.

[0018] The wall 8 is not formed around the entire outer periphery of the bottom plate 1, and there are some parts where the wall 8 is not formed, and these parts where the wall 8 is not formed serve as exhaust ports 16 (see FIG. 1) through which air is exhausted from the fan motor 1. In addition, the bottom plate 7 is formed with a second intake port 17, a third intake port 18, and a fourth intake port 19, which are through holes that take in air into the fan motor 1.

[0019] 4 to 8, the fan blade 4 has a yoke 21, an upper blade body 22, a lower blade body 23, a shaft portion 24 provided in the center of the yoke 21 and extending downward, and a plurality of permanent magnets 26 (six in this embodiment) bonded to the inner surface of a side wall portion 25 of the yoke 21. In this embodiment, the outer diameter D2 of the fan blade 4 is 54 mm, but the outer diameter D2 can be changed depending on the device in which the fan motor 1 is mounted, the desired cooling performance, etc.

[0020] The yoke 21 is made of metal and has a cylindrical shape that is closed at the top and open at the bottom, with a shaft portion 24 extending downward at the center. A plurality of locking grooves 27 (six in this embodiment) extending in the up-down direction (vertical direction) are formed in a side wall portion 25 of the yoke 21. Each locking groove portion 27 is formed in a concave shape and is disposed at equal intervals.

[0021] As shown in Figure 5, the upper blade body 22 is formed from synthetic resin and has a cylindrical upper base 28 located in the center, and multiple (113 in this embodiment) thin-plate-shaped upper blade portions 29 extending approximately radially from the upper base 28.

[0022] A plurality of (eight in this embodiment) concave locking portions 31 extending in the up-down direction (vertical direction) are formed on the inner surface portion 30 of the upper substrate 28. The eight concave locking portions 31 are disposed at equal intervals.

[0023] Upper blade portion 29 is curved in a substantially S-shape in plan view, and has an outer portion 33 provided with upper reinforcing plate portion 32, an intermediate portion 35 provided with upper restricting plate portion 34, and an inner portion 36 provided between upper base portion 28 and intermediate portion 33. Upper blade portion 29 has a diameter D3 inside intermediate portion 35 of approximately 44 mm, but diameter D3 can be changed depending on the device in which fan motor 1 is mounted, the desired cooling performance, and the like.

[0024] As shown in Figures 9 to 11, the upper blade portion 29 has an upper thickness T1 of 0.2 mm and a lower thickness T2 of 0.15 mm, tapering from the top to the bottom. This is just one example, and if the size of the fan motor 1 is changed, the thicknesses T1 and T2 of the upper blade portion 29 will change accordingly. The thicknesses T1 and T2 are common to the outer portion 33, the middle portion 35, and the inner portion 36. As shown in Figure 8, the interval S1 between adjacent upper blade portions 29 is narrower on the upper base portion 28 side and wider on the outer portion 33 side, but the upper blade portions 29 are arranged in parallel at equal intervals.

[0025] An upper reinforcing plate 32 in the form of a circular ring is provided on the upper portion of the outer portion 33. An outer peripheral surface 37 of the upper reinforcing plate 32 is flush with an outer end surface 38 of the upper blade portion 29. FIG. 15 shows a conventional fan blade 4A, but an outer peripheral surface 37A of the reinforcing plate 32A is not flush with an outer end surface 38A of the blade portion 29A, and the reinforcing plate 32A is provided inside (toward the base portion 28A) the outer end surface 38A. This causes a problem that a part of the air flows upward and diffuses outside the reinforcing plate 32A, resulting in poor air blowing efficiency. In this embodiment, the upper reinforcing plate 32 is disposed on the outermost side of the upper blade portion 29, preventing the air from moving upward, and improving the air blowing efficiency compared to the conventional fan blade 4A. In this embodiment, the plate thickness T3 (see Figure 9) of the upper reinforcing plate portion 32 is 0.5 mm, and the width M1 (see Figure 8) in the short side direction of the upper reinforcing plate portion 32 is 5 mm, but this is just one example, and if the size of the fan motor 1 changes, the values ​​of the plate thickness T3 and width M1 will also change accordingly.

[0026] Above the intermediate portion 35, the upper regulating plate portion 34 formed in a thin plate shape is horizontally extended in the rotation direction F (see FIG. 4) of the fan blade 4. In this embodiment, the upper regulating plate portion 34 has a plate thickness T4 (see FIG. 10) of 0.5 mm, a longitudinal length L1 (see FIG. 8) of the upper regulating plate portion 34 of 7 mm, and a lateral length L2 (see FIG. 10) of the upper regulating plate portion 34 of 0.5 mm, but this is only an example, and if the size of the fan motor 1 is changed, the values ​​of the plate thickness T3, length L1, and length L2 will change accordingly. The upper regulating plate portion 34 is formed to a length that does not contact the adjacent upper blade portion 29.

[0027] The upper surfaces of the upper base portion 28, the upper reinforcing plate portion 32, the upper restricting plate portion 34 and the inner portion 36 are flush with each other.

[0028] 5, the upper blade body 22 is connected to two adjacent upper blade portions 29 and an upper reinforcing plate portion 32, and has a plurality of (five in this embodiment) upper connecting portions 39 with a convex lower side. The upper connecting portions 39 are disposed at equal intervals.

[0029] In this embodiment, the upper base 28, the upper blade portion 29, the upper reinforcing plate portion 32, the upper regulating plate portion 34, and the upper connecting portion 39 are formed integrally, but some or all of them may be made as separate members and joined together to form the upper blade body 22.

[0030] As shown in Figure 6, the lower blade body 23 is formed from synthetic resin and has a cylindrical lower base 41 located in the center, a contact plate portion 43 extending horizontally outward from a lower portion 42 of the lower base 41, and multiple (113 in this embodiment) thin plate-shaped lower blade portions 44 extending approximately radially from the abutment plate portion 43.

[0031] A plurality (five in this embodiment) of inner convex locking portions 46 extending in the up-down direction (vertical direction) are formed on the inner surface portion 45 of the lower base portion 41. The five inner convex locking portions 46 are arranged at equal intervals. A plurality (eight in this embodiment) of outer convex locking portions 48 extending in the up-down direction (vertical direction) are formed on the outer surface portion 47 of the lower base portion 41. The eight outer convex locking portions 48 are arranged at equal intervals.

[0032] The lower blade portion 44 is curved in a substantially S-shape in plan view, and has an outer portion 50 provided with a lower reinforcing plate portion 49, an intermediate portion 52 provided with a lower restricting plate portion 51, and an inner portion 53 provided between the lower base portion 41 and the intermediate portion 52. The lower blade portion 44 has a diameter D4 inside the intermediate portion 52 of about 44 mm, but the diameter D4 can be changed depending on the device in which the fan motor 1 is mounted, the desired cooling performance, and the like.

[0033] As shown in Figures 9 to 11, the lower blade portion 44 has an upper thickness T5 of 0.15 mm and a lower thickness T6 of 0.2 mm, tapering from the bottom to the top. This is just one example, and if the size of the fan motor 1 is changed, the thicknesses T5 and T6 of the lower blade portion 44 will change accordingly. The thicknesses T5 and T6 are common to the outer portion 50, the middle portion 52, and the inner portion 53. As shown in Figure 7, the interval S2 between adjacent lower blade portions 44 is narrower on the lower base portion 41 side and wider on the outer portion 50 side, but the lower blade portions 44 are arranged in parallel at equal intervals.

[0034] A lower reinforcing plate 49 in the form of an annular plate is provided at the lower part of the outer portion 50. An outer peripheral surface 54 of the lower reinforcing plate 49 is flush with an outer end surface 55 of the lower blade portion 44. In this embodiment, the plate thickness T7 (see FIG. 9) of the lower reinforcing plate 49 is 0.5 mm, and the width M2 (see FIG. 7) in the short side direction of the lower reinforcing plate 49 is 5 mm, but this is just an example, and if the size of the fan motor 1 is changed, the values ​​of the plate thickness T7 and the width M2 will change accordingly.

[0035] Below the intermediate portion 35, the lower restricting plate portion 51 formed in a thin plate shape is provided to extend horizontally in the rotation direction F of the fan blade 4. In this embodiment, the lower restricting plate portion 51 has a plate thickness T8 (see FIG. 10) of 0.5 mm, a longitudinal length L3 (see FIG. 7) of the lower restricting plate portion 51 of 7 mm, and a lateral length L4 (see FIG. 10) of the lower restricting plate portion 51 of 0.5 mm, but this is only an example, and if the size of the fan motor 1 is changed, the values ​​of the plate thickness T8, length L3, and length L4 will change accordingly. The lower restricting plate portion 51 is formed to a length that does not contact the adjacent lower blade portion 44.

[0036] The upper surfaces of the lower base portion 41, the lower reinforcing plate portion 49, the lower restricting plate portion 51, and the inner portion 53 are flush with each other.

[0037] In this embodiment, the number of the upper blade portion 29 and the lower blade portion 44 is 113, but the number of the upper blade portion 29 and the lower blade portion 44 can be appropriately determined in consideration of the size of the fan blade 4, the required airflow (cooling efficiency), and the like. Therefore, for example, the number of the upper blade portion 29 and the lower blade portion 44 can be 30 or more, or 100 or more. In the present invention, the upper blade portion 29 and the lower blade portion 44 are abutted against each other to form one blade portion, so that the length of the upper blade portion 29 and the lower blade portion 44 is halved, and the plate thickness for ensuring the necessary strength can be thinned. Therefore, while the number of blade portions is 97 in the conventional fan blade 4A shown in FIG. 15, the number of blade portions in the fan blade 4 of this embodiment can be 113, which is 100 or more.

[0038] 6, the lower blade body 23 is connected to two adjacent lower blade portions 44 and the lower reinforcing plate portion 49, and has a plurality of (five in this embodiment) lower connecting portions 56 with concave upper sides. The lower connecting portions 56 are disposed at equal intervals.

[0039] In this embodiment, the lower base 41, the lower blade portion 44, the lower reinforcing plate portion 49, the lower restricting plate portion 51, and the lower connecting portion 56 are formed integrally, but some or all of them may be made as separate members and joined together to form the lower blade body 23.

[0040] The yoke 21 and the lower blade body 23 are formed by insert molding (integral molding), and the locking groove portion 27 of the yoke 21 is locked with the inner convex locking portion 46 of the lower blade body 23. The upper plate body 22 is positioned on the lower blade body 23 by the locking recessed locking portion 31 of the upper plate body 22 and the outer convex locking portion 48 of the lower blade body 23. The upper plate body 22 and the lower blade body 23 are joined by fitting, bonding or welding the upper base portion 28 and the lower base portion 41 together. At this time, the bottom of the upper base portion 28 abuts against the abutment plate portion 43, the lower end portion 40 of the upper blade portion 29 abuts against the upper end portion 57 of the lower blade portion 44 (see Figures 9 to 12), and the upper connecting portion 39 and the lower connecting portion 56 are fitted together. 10, the upper blade 29, the upper regulating plate 34, the lower blade 44, and the lower regulating plate 51 form a substantially U-shape in vertical cross section. The substantially U-shape may include those in which the corners of the upper blade 29, the upper regulating plate 34, the lower blade 44, and the lower regulating plate 51 are chamfered, those in which the corners are formed into an arc shape, and those in which the upper blade 29, the upper regulating plate 34, the lower blade 44, and the lower regulating plate 51 themselves are curved to form a substantially inverted C-shape. The yoke 21 and the lower blade body 23 may be formed separately and joined by adhesion or welding.

[0041] The same number of upper connectors 39 and lower connectors 56 are provided, and five of each are provided in this embodiment, but as long as the upper blade body 22 and the lower blade body 23 can be reliably fixed, the numbers of upper connectors 39 and lower connectors 56 can be appropriately determined taking into consideration the size of the fan blades 4, etc. Since the fan blades 4 are circular, it is preferable to have three or more connectors in order to stably fix them. Furthermore, by making the numbers of upper connectors 39 and lower connectors 56 each a prime number of three or more, it is possible to suppress resonance during rotation of the fan blades 4 and achieve noise reduction.

[0042] The fan blade 4 of this embodiment is composed of two parts, the upper plate body 22 and the lower blade body 23, and the upper blade portion 29 and the lower blade portion 44 are abutted against each other to form a single blade portion. As shown in FIG. 15, in the case of the blade portion 29A composed of one part, the blade portion 29A has a long vertical length, so that the blade portion 29A needs to have a certain thickness to prevent the blade portion 29A from bending. On the other hand, in the fan blade 4 of this embodiment, the blade portion is divided into the upper blade portion 29 and the lower blade portion 44, so that the vertical length of the upper blade portion 29 and the lower blade portion 44 is half that of the blade portion 29A, and the amount of bending is also smaller than that of the blade portion 29A, so the plate thickness can be made thinner. Therefore, the number of blade portions can be increased compared to the fan blade 4A. As a result, when fan blade 4 and fan blade 4A are rotated at the same speed, fan blade 4, which has a greater number of blades, can emit more air. Also, even if it rotates at a slower rotation speed than fan blade 4A, it can emit the same amount of air as fan blade 4A. By slowing down the rotation speed, noise can be reduced.

[0043] As shown in Figures 9 to 11, in this embodiment, the upper blade portion 29 and the lower blade portion 44 have one side 59, 60 on the side of the rotation direction F of the fan blade 4 and the other side 61, 62 on the opposite side to the rotation direction F of the fan blade 4 that are inclined and thin, but as shown in Figure 13, the upper blade portion 29 and the lower blade portion 44 may have one side 59, 60 inclined and the other side 61, 62 not inclined and thin. Also, as shown in Figure 14, the upper blade portion 29 and the lower blade portion 44 may have one side 59, 60 not inclined and the other side 61, 62 inclined and thin.

[0044] In the fan motor 1, when electricity is applied to the windings through the wiring 10, the fan blades 4, to which a yoke 21 having a permanent magnet 26 is attached, receive a magnetic force from the windings and rotate about the shaft 24. As the fan blades 4 rotate, air is taken into the fan blades 4 and the casing 5 from the first air intake 6, the second air intake 17, the third air intake 18, and the fourth air intake 19, and the air is discharged from the fan blades 4 in the outward direction between the adjacent upper blade portions 29 and lower blade portions 44. The air discharged from the fan blades 4 is discharged to the outside of the casing 5 from the exhaust port 16.

[0045] The fan motor 1 is mounted on a relatively small information processing device (not shown) such as a smartphone, tablet, notebook computer, etc. A heat source (object to be cooled) (not shown) such as a CPU (Central Processing Unit) provided in the information processing device, heat dissipation fins (not shown) in thermal contact with the heat source (object to be cooled), etc. are arranged outside the exhaust port 16, and the heat source (object to be cooled) is air-cooled by the air discharged from the exhaust port 16.

[0046] The fan motor 1 can also be mounted on a projector (not shown), which is an optical projection device that projects and displays an enlarged image on a screen or the like. Air can be blown from the exhaust port 16 to a heat source (object to be cooled) such as a light source provided in the projector, thereby air-cooling the heat source (object to be cooled).

[0047] In addition, in the fan blade 4 of this embodiment, the multiple upper blade portions 29 are arranged in a ring shape, the multiple lower blade portions 44 are arranged in a ring shape, and the multiple upper blade portions 29 are provided with annular plate-shaped upper reinforcing plate portions 32 on the outer periphery of the upper part of the multiple upper blade portions 29. under An annular lower reinforcing plate 49 is provided on the outer periphery of the upper blade 29. Therefore, the upper reinforcing plate 32 holds the upper blades 29, and the lower blades 44 hold the lower reinforcing plate 49. This makes it possible to suppress deformation and vibration of the upper blades 29 and the lower blades 44, and to suppress diffusion of air and vibration noise.

[0048] In addition, in the fan blade 4 of this embodiment, the multiple upper blade portions 29 are arranged in a ring shape, the multiple lower blade portions 44 are arranged in a ring shape, an annular upper reinforcing plate portion 32 is provided on the outer periphery of the upper part of the multiple upper blade portions 29, and an annular lower reinforcing plate portion 49 is provided on the outer periphery of the upper part of the multiple lower blade portions 44. Therefore, the multiple upper blade portions 29 can be held by the upper reinforcing plate portion 32, and the multiple lower blade portions 44 can be held by the lower reinforcing plate portion 49. This makes it possible to suppress deformation and vibration of the upper blade portions 29 and the lower blade portions 44, and to suppress diffusion of air and vibration noise.

[0049] In addition, in the fan blade 4 of this embodiment, the upper reinforcing plate 32 is provided on the outermost periphery of the upper blade body 22 having multiple upper blade portions 29, and the lower reinforcing plate 49 is provided on the outermost periphery of the lower blade body 23 having multiple lower blade portions 44. Therefore, near the air outlet of the fan blade 4, the upper reinforcing plate 32 and the lower reinforcing plate 49 make it difficult for air to flow in the vertical direction, thereby suppressing diffusion of the air. As a result, air can be released linearly from the fan blade 4.

[0050] In addition, in the fan blade 4 of this embodiment, the multiple upper blade portions 29 extend substantially radially from the upper base portion 28, and the multiple lower blade portions 44 extend substantially radially from the lower base portion 41, with the upper blade portions 29 having a portion on the upper base portion 28 side that does not have the upper limiting plate portion 34, and the lower blade portions 44 having a portion on the lower base portion 41 side that does not have the lower limiting plate portion 51. Therefore, air can be sufficiently taken into the fan blade 4 from the portion of the upper blade portion 29 that does not have the upper limiting plate portion 34 and the portion of the lower blade portion 44 that does not have the lower limiting plate portion 51.

[0051] In addition, in the fan blade 4 of this embodiment, the upper blade portion 29 has, from the upper base portion 28 side toward the outermost periphery, a portion without the upper restricting plate portion 34, a portion with the upper restricting plate portion 34, and a portion with the upper reinforcing plate portion 32, while the lower blade portion 44 has, from the lower base portion 41 side toward the outermost periphery, a portion without the lower restricting plate portion 51, a portion with the lower restricting plate portion 51, and a portion with the lower reinforcing plate portion 49. Therefore, by taking in air from the portion without the upper restricting plate portion 34 and the lower restricting plate portion 51 close to the upper base portion 28 and the base portion 41 side and making it difficult for the air to flow vertically toward the outermost periphery, the air can be released linearly from the outlet of the fan blade 4.

[0052] In addition, in the fan blade 4 of this embodiment, the thickness T1 of the upper side of the upper blade portion 29 is formed to be thicker than the thickness T2 of the lower side, and the thickness T6 of the lower side of the lower blade portion 44 is formed to be thicker than the thickness T5 of the upper side. Therefore, the air flowing along the upper blade portion 29 tends to flow downward, and the air flowing along the lower blade portion 44 tends to flow upward. As a result, the air is concentrated at the contact portion between the upper blade portion 29 and the lower blade portion 44, the air flow speed in that portion is increased, and the air with a high flow speed can be discharged from the outlet of the fan blade 4.

[0053] In addition, in the fan blade 4 of this embodiment, the multiple upper blade sections 29 extend substantially radially from the upper base 28, and the multiple lower blade sections 44 extend substantially radially from the lower base 41, and the upper base 28 and the lower base 41 are joined together. This allows the central sides of the upper stage blade body 22 and the lower stage blade body 23 to be firmly connected.

[0054] Moreover, the fan blade 4 of this embodiment includes an upper stage blade body 22 having a plurality of upper blade portions 29 and an upper base portion 28, a lower stage blade body 23 having a plurality of lower blade portions 44 and a lower base portion 41, and has upper connecting portions 39 and lower connecting portions 56 that fasten the upper stage blade body 22 and the lower stage blade body 23 together, with the upper connecting portions 39 and lower connecting portions 56 being provided at three or more prime number locations. This makes it possible to suppress resonance during rotation of the fan blade 4 and achieve noise reduction.

[0055] Furthermore, the fan blades 4 of this embodiment have the same number of upper blade portions 29 and lower blade portions 44, totaling more than 100. With a large number of upper blade portions 29 and lower blade portions 44, totaling more than 100, a large amount of air can be discharged.

[0056] Furthermore, in the fan blades 4 of this embodiment, the diameter D3 on the inside of the portion having the upper restricting plate portion 34 is approximately the same as the diameter D1 of the first air intake port 6 formed in the casing 5 that houses the fan blades 4. Therefore, the flow of air taken into the casing 5 from the first air intake port 6 is less likely to be restricted by the upper restricting plate portion 34, and air can be efficiently taken into the fan blades 4.

[0057] The fan motor 1 of this embodiment includes fan blades 4, a casing 5 that houses the fan blades 4, and a motor unit 9. Therefore, the fan motor 1 can be incorporated as a unit into various information processing devices that include a heat source (an object to be cooled).

[0058] The information processing device of this embodiment includes a fan motor 1 as a cooling means. Therefore, the air discharged from the fan motor 1 can cool a heat source (a cooling target) included in the information processing device.

[0059] The projector of this embodiment includes a fan motor 1 as a cooling means. Therefore, the air discharged from the fan motor 1 can air-cool a heat source (a cooling target) included in the projector.

[0060] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the yoke may be formed by insert molding (integral molding) with the upper plate body, rather than the lower plate body. [Explanation of symbols]

[0061] 1 Fan motor 4 Fan Blades 5 Casing 6 First air intake (air intake) 9 Motor unit 22 Upper blade body (first blade body) 23 Lower blade body (second blade body) 28 Upper base (1st base) 29 Upper wing part (first wing part) 32 Upper reinforcing plate portion (first reinforcing plate portion) 33 outer portion (portion having first reinforcing plate portion) 34 Upper regulating plate portion (first regulating plate portion) 35 Middle portion (portion having first regulating plate portion) 36 Inner portion (portion not having the first restricting plate portion) 39 Upper connection part (connection part) 40 Lower end 41 Lower base (second base) 44 Lower wing part (second wing part) 49 Lower reinforcing plate part (second reinforcing plate part) 50 outer portion (portion having second reinforcing plate portion) 51 Lower regulating plate portion (second regulating plate portion) 52 Middle portion (portion having second regulating plate portion) 53 Inner portion (portion not having the first restricting plate portion) 56 Lower connection part (connection part) 57 Upper end D1 Diameter of the first intake port 6 (diameter of the intake port) D4: Diameter inside the middle portion 35 (diameter inside the portion having the first restricting plate portion) F Rotation direction T1: Upper plate thickness of the upper wing portion 29 (upper plate thickness of the first wing portion) T2: Lower plate thickness of upper wing portion 29 (lower plate thickness of first wing portion) T5: Upper plate thickness of the lower wing portion 44 (upper plate thickness of the second wing portion) T6: Thickness of the lower side of the lower wing portion 44 (thickness of the lower side of the second wing portion)

Claims

1. A fan blade of a centrifugal fan, A plurality of first blade portions; A plurality of second blade portions, A first restricting plate portion is provided on an upper portion of the first blade portion and extends in a rotation direction of the fan blade, A second regulating plate portion is provided at a lower portion of the second blade portion and extends in a rotation direction of the fan blade, A fan blade characterized in that the lower end of the first blade portion and the upper end of the second blade portion abut each other, so that the first blade portion, the first regulating plate portion, the second blade portion, and the second regulating plate portion form an approximately C-shape.

2. The first blade portions are arranged in a circular manner, The second blade portions are arranged in a circular pattern, A first reinforcing plate portion having an annular plate shape is provided on an outer periphery of an upper portion of the plurality of first blade portions, The fan blade according to claim 1 , wherein a second reinforcing plate having an annular plate shape is provided on an outer periphery of a lower portion of each of the second blade portions.

3. the first reinforcing plate portion is provided on an outermost peripheral portion of a first blade body having the plurality of first vane portions; 3. The fan blade according to claim 2, wherein the second reinforcing plate portion is provided at an outermost periphery of a second blade body having the plurality of second vane portions.

4. The first blade portions extend substantially radially from a first base portion, The second blade portions extend substantially radially from the second base portion, The first blade portion has a portion on the first base portion side that does not have the first restricting plate portion, The fan blade according to claim 3 , wherein the second blade portion has a portion on the second base side that does not have the second restricting plate portion.

5. the first blade portion includes, from the first base portion side toward the outermost peripheral portion side, a portion not including a first restricting plate portion, a portion including a first restricting plate portion, and a portion including the first reinforcing plate portion, The fan blade according to claim 4, characterized in that the second blade portion, from the second base side toward the outermost peripheral portion, has a portion that does not have a second regulating plate portion, a portion that has a second regulating plate portion, and a portion that has the second reinforcing plate portion.

6. The plate thickness of the upper side of the first blade portion is formed to be thicker than the plate thickness of the lower side, 2. The fan blade according to claim 1, wherein a thickness of a lower side of the second blade portion is greater than a thickness of an upper side of the second blade portion.

7. The first blade portions extend substantially radially from a first base portion, The second blade portions extend substantially radially from the second base portion, The fan blade according to claim 1 , wherein the first base portion and the second base portion are joined together.

8. a first blade body including the plurality of first blade portions and the first base portion; a second blade body including the plurality of second blade portions and the second base portion; a connecting portion for fastening the first blade body and the second blade body, The fan blade according to claim 7, wherein the connecting portions are provided at three or more prime number of points.

9. The fan blade according to claim 1 , wherein the number of the first blade portions and the number of the second blade portions are equal to each other, and the total number of the first blade portions is 100 or more.

10. 6. The fan blade according to claim 5, wherein a diameter inside the portion having the first restricting plate portion is substantially the same as a diameter of an intake port formed in a casing that houses the fan blade.

11. A fan motor comprising: a fan blade according to any one of claims 1 to 10; a casing that houses the fan blade; and a motor unit.

12. An information processing apparatus comprising the fan motor according to claim 11 as a cooling means.

13. A projector comprising the fan motor according to claim 11 as a cooling means.

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