Fan blade, fan motor, information processing device and projector

Abstract

To provide a fan blade that can ensure a sufficient amount of airflow and cooling effect even when the fan blade is thinned, 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 for a centrifugal fan, and comprises a plurality of upper blade portions 29 and a plurality of lower blade portions 44. The upper portion 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 portion of the lower blade portion 44 has a lower regulating plate portion 51 extending in the rotation direction F of the fan blade 4. When 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, upper regulating plate portion 34, lower blade portion 44, and lower regulating plate portion 51 form an approximately U-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] BACKGROUND ART Centrifugal fans have been proposed that are mounted in various electronic devices and that blow air onto heat-generating bodies to cool them (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, and game consoles, but in recent years, there has been a demand for thinner electronic devices. To make electronic devices thinner, there is also a demand for thinner centrifugal fans mounted in the electronic devices. [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 in 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 airflow 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 the upper part of the first blade portion has a first regulating plate portion extending in the rotation direction of the fan blade, and the lower part of the second blade portion has a second regulating plate portion extending in the rotation direction of the fan blade, and the lower part of the first blade portion abuts against the upper part 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 U-shape.

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

[0009] The information processing device of the present invention is characterized by including the above-described fan motor as a cooling means.

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

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

[0012] [Figure 1] 1 is a perspective view of a fan motor according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the upper case of the fan motor according to the embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the fan motor according to the embodiment, showing an upper case and fan blades disassembled therein. [Figure 4] FIG. 2 is an upper perspective view of the fan blade of the embodiment. [Figure 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 perspective view of the underside 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 the 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] 10 is a modified example of the upper blade portion and the lower blade portion of the same embodiment. [Figure 14] 10 shows another modified example of the upper blade portion and the lower blade portion of the same embodiment. [Figure 15] FIG. 10 is an explanatory diagram illustrating the position of a reinforcing plate portion of a conventional fan blade. DETAILED DESCRIPTION OF THE INVENTION

[0013] Preferred embodiments of the present invention will be described below 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 according to 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 draws air into 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 equipment in which the fan motor 1 is installed, 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 that supplies power to the motor unit 9.

[0017] A motor unit 9 is disposed in the approximate center of the bottom plate 7. The motor unit 9 has a laminated core 11, a bearing 12 provided in the center of the laminated core 11, and windings (not shown) wound around multiple (six in this embodiment) arm portions 13 of the laminated core 11. The bearing 12 has an insertion hole 14 through which a shaft 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 discharged from the fan motor 1. In addition, the bottom plate 7 is formed with a second air intake port 17, a third air intake port 18, and a fourth air intake port 19, which are through holes that take in air into the fan motor 1.

[0019] 4 to 8, fan blade 4 has yoke 21, upper blade body 22, lower blade body 23, shaft 24 provided in the center of yoke 21 and extending downward, and multiple (six in this embodiment) permanent magnets 26 bonded to the inner surface of side wall 25 of yoke 21. In this embodiment, fan blade 4 has an outer diameter D2 of 54 mm, but outer diameter D2 can be changed depending on the equipment in which fan motor 1 is installed, 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 24 extending downward in the center. A plurality of (six in this embodiment) locking grooves 27 extending in the up-down direction (longitudinal direction) are formed in a side wall 25 of the yoke 21. The locking grooves 27 are formed in a concave shape and are arranged 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) recessed locking portions 31 extending in the up-down direction (longitudinal direction) are formed on the inner surface portion 30 of the upper base portion 28. The eight recessed locking portions 31 are arranged at equal intervals.

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

[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 downward. This is just one example, and if the size of the fan motor 1 changes, the thicknesses T1 and T2 of the upper blade portion 29 will also change accordingly. The thicknesses T1 and T2 are common to the outer portion 33, middle portion 35, and inner portion 36. As shown in Figure 8, the spacing 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 side by side at equal intervals.

[0025] An upper reinforcing plate 32 having a circular ring shape 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. However, the outer peripheral surface 37A of the reinforcing plate 32A is not flush with an outer end surface 38A of the blade portion 29A. The reinforcing plate 32A is located inside the outer end surface 38A (toward the base portion 28A). This causes some air to flow upward and diffuse outside the reinforcing plate 32A, resulting in poor airflow efficiency. In this embodiment, the upper reinforcing plate 32 is located at the outermost part of the upper blade portion 29, preventing air from moving upward and improving airflow efficiency compared to the conventional fan blade 4A. In this embodiment, the 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 direction of the upper reinforcing plate portion 32 is 5 mm, but this is just an example, and if the size of the fan motor 1 changes, the values ​​of the 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 provided extending horizontally in the rotation direction F (see FIG. 4) of the fan blade 4. In this embodiment, the thickness T4 (see FIG. 10) of the upper regulating plate portion 34 is 0.5 mm, the length L1 (see FIG. 8) of the upper regulating plate portion 34 in the longitudinal direction is 7 mm, and the length L2 (see FIG. 10) of the upper regulating plate portion 34 in the lateral direction is 0.5 mm. However, this is just an example, and if the size of the fan motor 1 is changed, the values ​​of the thickness T3, length L1, and length L2 will also 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 has a plurality of (five in this embodiment) upper connecting portions 39 each having a convex lower side, which are connected to two adjacent upper blade portions 29 and an upper reinforcing plate portion 32. The upper connecting portions 39 are arranged at equal intervals.

[0029] In this embodiment, the upper base 28, the upper blade 29, the upper reinforcing plate 32, the upper regulating plate 34, and the upper connecting portion 39 are formed integrally, but some or all of them may be 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 contact plate portion 43.

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

[0032] Lower blade portion 44 is curved in a generally S-shape in plan view, and has outer portion 50 provided with lower reinforcing plate portion 49, middle portion 52 provided with lower restricting plate portion 51, and inner portion 53 provided between lower base portion 41 and middle portion 52. Diameter D4 of lower blade portion 44 inside middle portion 52 is approximately 44 mm, but diameter D4 can be changed depending on the equipment in which fan motor 1 is installed, the desired cooling performance, etc.

[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 bottom to top. This is just one example, and if the size of the fan motor 1 changes, the thicknesses T5 and T6 of the lower blade portion 44 will also change accordingly. The thicknesses T5 and T6 are common to the outer portion 50, middle portion 52, and inner portion 53. As shown in Figure 7, the spacing 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 side by side at equal intervals.

[0034] A lower reinforcing plate 49 in the shape of an annular plate is provided at the bottom 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 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 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 thickness T7 and the width M2 will also change accordingly.

[0035] A thin lower restricting plate 51 extends horizontally in the rotation direction F of the fan blade 4 below the intermediate portion 35. In this embodiment, the lower restricting plate 51 has a thickness T8 (see FIG. 10) of 0.5 mm, a longitudinal length L3 (see FIG. 7) of 7 mm, and a lateral length L4 (see FIG. 10) of 0.5 mm. However, this is just an example, and if the size of the fan motor 1 is changed, the thickness T8, length L3, and length L4 will also change accordingly. The lower restricting plate 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 upper blades 29 and the lower blades 44 each have 113 blades. However, the number of blades can be determined appropriately based on the size of the fan blade 4, the desired airflow (cooling efficiency), and other factors. Therefore, for example, the number of blades can be set to 30 or more, or 100 or more. In the present invention, the upper blades 29 and the lower blades 44 are configured to abut against each other to form a single blade. This reduces the length of the upper blades 29 and the lower blades 44 by half, thereby reducing the plate thickness required to ensure the required strength. Therefore, while the conventional fan blade 4A shown in FIG. 15 has 97 blades, the fan blade 4 of this embodiment can have 113 blades, which is 100 or more.

[0038] 6, the lower blade body 23 is connected to two adjacent lower blade portions 44 and a 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 arranged at equal intervals.

[0039] In this embodiment, the lower base 41, the lower blade 44, the lower reinforcing plate 49, the lower regulating plate 51, and the lower connecting portion 56 are formed integrally, but some or all of them may be separate components 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. Furthermore, the recessed locking portion 31 of the upper plate body 22 is locked with the outer convex locking portion 48 of the lower blade body 23, thereby positioning the upper plate body 22 on 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 restricting plate 34, the lower blade 44, and the lower restricting plate 51 form a generally U-shape in vertical cross section. The generally U-shape may include those in which the corners of the upper blade 29, the upper restricting plate 34, the lower blade 44, and the lower restricting plate 51 are chamfered, those in which the corners are formed into an arc, and those in which the upper blade 29, the upper restricting plate 34, the lower blade 44, and the lower restricting plate 51 themselves are curved to form a generally inverted C-shape. Note that the yoke 21 and the lower blade body 23 may be formed separately and joined by adhesive or welding.

[0041] The same number of upper connectors 39 and lower connectors 56 are provided, and in this embodiment, five of each are provided, 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 determined appropriately taking into account factors such as the size of the fan blades 4. Because the fan blades 4 are circular, it is preferable to have three or more connectors to ensure stable fixation. Furthermore, by setting the numbers of upper connectors 39 and lower connectors 56 to prime numbers greater than or equal to three, resonance during rotation of the fan blades 4 can be suppressed, resulting in quieter operation.

[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 to form a single blade. As shown in FIG. 15 , in the case of a blade portion 29A composed of a single part, the blade portion 29A has a long vertical length. Therefore, to prevent the blade portion 29A from bending, the blade portion 29A needs to have a certain thickness. 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. Therefore, the vertical length of the upper blade portion 29 and the lower blade portion 44 is half that of the blade portion 29A. This reduces the amount of bending compared to the blade portion 29A, and therefore the plate thickness can be made thinner. This allows for a larger number of blades than 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 more blades, can emit more air. Also, even if it rotates at a slower speed than fan blade 4A, it can emit the same amount of air as fan blade 4A. By slowing down the rotation speed, quieter operation can be achieved.

[0043] 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 facing the rotation direction F of the fan blade 4 and the other side 61, 62 on the side opposite the rotation direction F of the fan blade 4 that are tapered and thin, but as shown in Fig. 13, the upper blade portion 29 and the lower blade portion 44 may have one side 59, 60 tapered and the other side 61, 62 not tapered and thin, as shown in Fig. 14. Alternatively, the upper blade portion 29 and the lower blade portion 44 may have one side 59, 60 not tapered and the other side 61, 62 tapered and thin, as shown in Fig. 15.

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

[0045] The fan motor 1 is mounted on a relatively small information processing device (not shown) such as a smartphone, tablet, laptop, etc. A heat source (object to be cooled) (not shown) such as a CPU (central processing unit) provided in the information processing device, and heat dissipation fins (not shown) in thermal contact with the heat source (object to be cooled) 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] As described above, the fan blade 4 of this embodiment is a centrifugal fan blade 4 comprising a plurality of upper blade portions 29 and a plurality of lower blade portions 44. The upper blade portions 29 have upper stop plates 34 extending in the rotation direction F of the fan blade 4 at their upper portions, and the lower blade portions 44 have lower stop plates 51 extending in the rotation direction F of the fan blade 4 at their lower portions. The lower ends 40 of the upper blade portions 29 and the upper ends 57 of the lower blade portions 44 abut against each other, forming a generally U-shape among the upper blade portions 29, upper stop plates 34, lower blade portions 44, and lower stop plates 51. Therefore, the upper stop plates 34 and lower stop plates 51 make it difficult for air released from the fan blades 4 to flow vertically, preventing the air from diffusing. As a result, air can be released linearly from the fan blades 4.

[0048] Furthermore, in the fan blade 4 of this embodiment, the multiple upper blade portions 29 are arranged side by side in an annular shape, the multiple lower blade portions 44 are arranged side by side in an annular shape, an annular upper reinforcing plate 32 is provided on the outer periphery of the upper parts of the multiple upper blade portions 29, and an annular lower reinforcing plate 49 is provided on the outer periphery of the upper parts of the multiple lower blade portions 44. Therefore, the multiple upper blade portions 29 can be held by the upper reinforcing plate 32, and the multiple lower blade portions 44 can be held by the lower reinforcing plate 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 air diffusion and vibration noise.

[0049] Furthermore, 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, which includes multiple upper blade portions 29, and the lower reinforcing plate 49 is provided on the outermost periphery of the lower blade body 23, which includes multiple lower blade portions 44. Therefore, the upper reinforcing plate 32 and the lower reinforcing plate 49 make it difficult for air to flow vertically near the air outlet of the fan blade 4, thereby suppressing air diffusion. As a result, air can be released linearly from the fan blade 4.

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

[0051] Furthermore, in fan blade 4 of this embodiment, upper blade section 29 has, from upper base section 28 toward the outermost periphery, a section that does not have upper stop plate 34, a section that has upper stop plate 34, and a section that has upper reinforcing plate 32, while lower blade section 44 has, from lower base section 41 toward the outermost periphery, a section that does not have lower stop plate 51, a section that has lower stop plate 51, and a section that has lower reinforcing plate 49. Therefore, air is taken in from the sections that do not have upper stop plate 34 and lower stop plate 51 near upper base section 28 and base 41, and by making it difficult for air to flow vertically toward the outermost periphery, air can be released linearly from the outlet of fan blade 4.

[0052] Furthermore, in the fan blade 4 of this embodiment, the thickness T1 of the upper side of the upper blade portion 29 is thicker than the thickness T2 of the lower side, and the thickness T6 of the lower side of the lower blade portion 44 is thicker than the thickness T5 of the upper side. Therefore, air flowing along the upper blade portion 29 tends to flow downward, and air flowing along the lower blade portion 44 tends to flow upward. As a result, air concentrates at the contact portion between the upper blade portion 29 and the lower blade portion 44, increasing the air flow velocity in that portion, and allowing fast-flowing air to be released 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 generally radially from the upper base section 28, and the multiple lower blade sections 44 extend generally radially from the lower base section 41, and the upper base section 28 and the lower base section 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] Furthermore, fan blade 4 of this embodiment includes upper stage blade body 22 having a plurality of upper blade portions 29 and upper base portion 28, and lower stage blade body 23 having a plurality of lower blade portions 44 and lower base portion 41, and has upper connecting portions 39 and lower connecting portions 56 that fasten upper stage blade body 22 and lower stage blade body 23 together, with upper connecting portions 39 and lower connecting portions 56 provided at three or more prime number locations. This suppresses resonance during rotation of fan blade 4, thereby achieving quieter operation.

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

[0056] Furthermore, in the fan blades 4 of this embodiment, the diameter D3 inside the portion having the upper restricting plate 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 34, and air can be taken into the fan blades 4 efficiently.

[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 (a target to be cooled).

[0058] The information processing apparatus 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 information processing apparatus.

[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 intake port (intake port) 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 restricting plate portion) 36 Inner portion (portion not having 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 intermediate portion (portion having second restricting plate portion) 53 Inner portion (portion not having 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 intermediate 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 blade portion 44 (upper plate thickness of the second blade portion) T6: Lower plate thickness of the lower blade portion 44 (lower plate thickness of the second blade 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 provided on an upper portion of the first blade portion and extending in the rotation direction of the fan blade; a second restricting plate portion provided at a lower portion of the second blade portion and extending in the 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 plurality of first blade portions are arranged side by side in an annular shape, The plurality of second blade portions are arranged side by side in an annular shape, 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 an upper portion of each of the second blade portions.

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

4. The plurality of first blade portions extend substantially radially from a first base portion, The plurality of second blade portions extend substantially radially from the second base portion, a portion of the first blade portion on the side of the first base portion 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 has, from the first base portion side toward the outermost peripheral portion side, a portion not having a first restricting plate portion, a portion having a first restricting plate portion, and a portion having the first reinforcing plate portion, 5. A fan blade as described in claim 4, characterized in that the second blade portion has, from the second base side toward the outermost peripheral portion, 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 thickness of the upper side of the first blade portion is formed to be thicker than the thickness of the lower side thereof, 2. The fan blade according to claim 1, wherein the thickness of the lower side of the second blade portion is greater than the thickness of the upper side.

7. The plurality of first blade portions extend substantially radially from a first base portion, The plurality of 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 that fixes 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 locations.

9. 2. 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 are 100 or more.

10. 6. The fan blade according to claim 5, wherein the diameter of the portion inside the portion having the first restricting plate portion is approximately the same as the 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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