Fan blade, fan motor, information processing device, and projector

Abstract

The invention provides a fan blade capable of ensuring sufficient air supply amount and cooling effect even under the condition that the fan blade is thinned, a fan motor equipped with the fan blade, an information processing device equipped with the fan motor, and a projector equipped with the fan motor. A fan blade (4) of a centrifugal fan is provided with a plurality of upper blade parts (29) and a plurality of lower blade parts (44), the upper part of each upper blade part (29) is provided with an upper limiting plate part (34) extending in the rotation direction (F) of the fan blade (4), and the lower part of each lower blade part (44) is provided with a lower limiting plate part (51) extending in the rotation direction (F) of the fan blade (4). The upper blade portion (29), the upper restricting plate portion (34), the lower blade portion (44), and the lower restricting plate portion (51) are substantially U-shaped as a result of the lower end portion (40) of the upper blade portion (29) being in contact with the upper end portion (57) of the lower blade portion (44).

Description

Technical Field

[0001] The present invention relates to a fan blade of a centrifugal fan, a fan motor assembled with the fan blade, an information processing device equipped with the fan motor, and a projector equipped with the fan motor. Background Technology

[0002] A centrifugal fan is proposed that is mounted on various electronic devices to cool heat-generating components (for example, see Patent Document 1).

[0003] The centrifugal fan described in Patent Document 1 (see reference numerals "38" and "39" in Prior Art Document 1) is mounted on electronic devices such as laptop PCs, desktop PCs, tablet PCs, smartphones, and game consoles (see reference numeral "10" in Prior Art Document 1). In recent years, such electronic devices have been required to be thinner. In order to make electronic devices thinner, the centrifugal fan mounted on the electronic device also needs to be thinner.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2024-055133 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, if the centrifugal fan is simply made thinner, the air volume per unit time will be reduced, resulting in insufficient cooling effect.

[0009] Therefore, the object of the present invention is to solve the above-mentioned problems and provide a fan blade that can ensure sufficient airflow and cooling effect even when it is thin, a fan motor assembled with the fan blade, an information processing device equipped with the fan motor, and a projector equipped with the fan motor.

[0010] Methods for solving problems

[0011] The fan blade of the present invention is a fan blade of a centrifugal fan, characterized in that it has a plurality of first blade portions and a plurality of second blade portions, a first limiting plate portion extending in the rotation direction of the fan blade is provided on the upper part of the first blade portion, and a second limiting plate portion extending in the rotation direction of the fan blade is provided on the lower part of the second blade portion, and the first blade portion, the first limiting plate portion, the second blade portion and the second limiting plate portion are formed into a generally U-shaped form by abutting the lower part of the first blade portion with the upper part of the second blade portion.

[0012] The fan motor of the present invention is characterized by having the aforementioned fan blades, a housing accommodating the fan blades, and a motor unit.

[0013] The information processing device of the present invention is characterized by having the above-mentioned fan motor as a cooling mechanism.

[0014] The projector of the present invention is characterized by having the above-mentioned fan motor as a cooling mechanism.

[0015] Invention Effects

[0016] According to the invention of this application, sufficient airflow and cooling effect can be ensured. Attached Figure Description

[0017] Figure 1 This is a perspective view of a fan motor according to an embodiment of the present invention.

[0018] Figure 2 This is an exploded perspective view of the upper housing of the fan motor in this embodiment.

[0019] Figure 3 This is an exploded perspective view of the upper housing and fan blades of the fan motor in this embodiment.

[0020] Figure 4 This is a perspective view of the upper side of the fan blades in this embodiment.

[0021] Figure 5 This is a perspective view of the upper blade body of this embodiment.

[0022] Figure 6 This is a perspective view of the lower blade body and yoke of this embodiment.

[0023] Figure 7 This is a perspective view of the fan blades in this embodiment from the lower side.

[0024] Figure 8 This is a top view of the fan blades in this embodiment.

[0025] Figure 9 yes Figure 8 AA sectional view.

[0026] Figure 10 yes Figure 8 BB cross-sectional view.

[0027] Figure 11 yes Figure 8 CC section view.

[0028] Figure 12 This is a front view of the fan blades in this embodiment.

[0029] Figure 13This is a variation of the upper blade portion and the lower blade portion of this embodiment.

[0030] Figure 14 These are other variations of the upper and lower blade portions of this embodiment.

[0031] Figure 15 This is an explanatory diagram illustrating the position of the reinforcing plate on conventional fan blades.

[0032] Explanation of reference numerals in the attached figures

[0033] 1 fan motor

[0034] 4 fan blades

[0035] 5. Outer shell

[0036] 6. First air intake (intake port)

[0037] 9 motor units

[0038] 22 Upper blade body (first blade body)

[0039] 23 Lower blade body (second blade body)

[0040] 28 Upper base (first base)

[0041] 29 Upper blade section (first blade section)

[0042] 32 Upper Reinforcing Plate Section (First Reinforcing Plate Section)

[0043] 33. Outer side (the part with the first reinforcing plate)

[0044] 34 Upper limiting plate section (first limiting plate section)

[0045] 35. Middle section (the portion having the first limiting plate)

[0046] 36. Inner side (the part without the first limiting plate)

[0047] 39. Upper connecting part (connecting part)

[0048] 40 lower end

[0049] 41 Lower base (second base)

[0050] 44 Lower blade section (second blade section)

[0051] 49. Lower reinforcing plate section (second reinforcing plate section)

[0052] 50. Outer side (the part with the second reinforcing plate)

[0053] 51 Lower limiting plate section (second limiting plate section)

[0054] 52. Middle section (the part with the second limiting plate)

[0055] 53. Inner side (the part without the first limiting plate)

[0056] 56. Lower connecting part (connecting part)

[0057] 57 Upper end

[0058] Diameter of the first intake port 6 (diameter of the intake port)

[0059] D4 is the diameter of the portion inside the middle part 35 (the diameter of the portion inside the first limiting plate part).

[0060] F Rotation direction

[0061] The plate thickness on the upper side of the blade section 29 of T1 (the plate thickness on the upper side of the first blade section).

[0062] The thickness of the plate on the lower side of the upper blade section 29 of T2 (the thickness of the plate on the lower side of the first blade section).

[0063] The plate thickness on the upper side of the lower blade section 44 of T5 (the plate thickness on the upper side of the second blade section).

[0064] The thickness of the plate on the lower side of the T6 lower blade section 44 (the thickness of the plate on the lower side of the second blade section). Detailed Implementation

[0065] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Not all structures described below are necessarily essential features of the present invention.

[0066] Figure 1 The appearance of the fan motor 1 of a centrifugal fan, as an embodiment of the present invention, is shown. Figure 2 and Figure 3 As shown, the fan motor 1 is configured to have an upper housing 2, a lower housing 3, and fan blades 4. The upper housing 2 and the lower housing 3 constitute the outer casing 5, which houses the fan blades 4.

[0067] The upper housing 2, which is formed into a thin plate shape, has a circular first air intake 6 for drawing air into the fan motor 1. In this embodiment, the diameter D1 of the first air intake 6 is 44 mm, but the diameter D1 may be changed depending on the device that mounts the fan motor 1, the required cooling performance, etc.

[0068] like Figure 3 As shown, the lower housing 3 is configured to have a thin plate-shaped base plate 7, a wall portion 8 erected on the outer periphery of the base plate 7, a motor unit 9 fixed to the base plate 7, and wiring 10 for supplying power to the motor unit 9.

[0069] A motor unit 9 is disposed approximately in the center of the base plate 7. The motor unit 9 has a laminated iron core 11, a bearing portion 12 disposed in the center of the laminated iron core 11, and windings (not shown) wound around multiple (six in this embodiment) arms 13 mounted on the laminated iron core 11. In the bearing portion 12, a shaft portion 24 is formed for fixing to the fan blade 4 by laser welding (see reference). Figure 7 The insertion hole 14 is inserted through the base plate 7. A mounting plate 15 is fixed to the base plate 7, and a motor unit 9 is mounted on the mounting plate 15. The permanent magnet 26, which will be described later, also constitutes the motor unit 9.

[0070] The wall portion 8 is not formed all around the outer periphery of the base plate portion 1; there are localized areas where the wall portion 8 is not formed. These areas where the wall portion 8 is not formed become the exhaust port 16 for air to be discharged from the fan motor 1 (see reference). Figure 1 Additionally, in the base plate 7, a second air intake 17, a third air intake 18, and a fourth air intake 19 are formed as through holes for drawing air into the fan motor 1.

[0071] like Figures 4-8 As shown, 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 portion of the yoke 21 and extending downward, and a plurality of permanent magnets 26 (six in this embodiment) bonded to the inner surface of the side wall portion 25 of the yoke 21. The outer diameter D2 of the fan blade 4 in this embodiment is formed to be 54 mm, but the shape D2 may be changed depending on the device that mounts the fan motor 1, the required cooling performance, etc.

[0072] The yoke 21 is made of metal and has a cylindrical shape that is closed at the top and open at the bottom. A shaft portion 24 extending downward is provided in the center portion. On the side wall portion 25 of the yoke 21, a plurality of (six in this embodiment) locking groove portions 27 extending in the vertical direction (longitudinal direction) are formed. Each locking groove portion 27 is formed to be concave and is arranged at equal intervals.

[0073] like Figure 5 As shown, the upper blade body 22 is formed of synthetic resin and has a cylindrical upper base 28 disposed in the central part and a plurality of thin plate-shaped upper blade portions 29 (113 in this embodiment) extending radially from the upper base 28.

[0074] On the inner surface portion 30 of the upper base portion 28, a plurality of (eight in this embodiment) concave locking portions 31 extending in the vertical direction (longitudinal direction) are formed. The eight concave locking portions 31 are arranged at equal intervals.

[0075] The upper blade portion 29 is curved into a roughly S-shape when viewed from above, and has an outer portion 33 on which an upper reinforcing plate portion 32 is provided, a middle portion 35 on which an upper limiting plate portion 34 is provided, and an inner portion 36 located between the upper base portion 28 and the middle portion 33. The diameter D3 of the upper blade portion 29, which is closer to the middle portion 35, is formed to be approximately 44 mm, but the diameter D3 may be changed depending on the equipment that mounts the fan motor 1, the required cooling performance, etc.

[0076] like Figures 9-11 As shown, the thickness T1 of the upper blade portion 29 is 0.2 mm, and the thickness T2 of the lower blade portion 29 is 0.15 mm. The upper blade portion 29 tapers towards the front end from top to bottom. This is one example; if the size of the fan motor 1 changes, the values ​​of the thicknesses T1 and T2 of the upper blade portion 29 must also change accordingly. The thicknesses T1 and T2 are common in the outer portion 33, the middle portion 35, and the inner portion 36. Figure 8 As shown, the interval S1 between adjacent upper blade portions 29 is narrow on the upper base portion 28 side and wide on the outer side portion 33 side, but each upper blade portion 29 is arranged side by side at equal intervals.

[0077] A ring-shaped upper reinforcing plate portion 32 is provided on the upper part of the outer side portion 33. The outer peripheral surface 37 of the upper reinforcing plate portion 32 is coplanar with the outer end surface 38 of the upper blade portion 29. Figure 15 The conventional fan blade 4A is shown, but because the outer peripheral surface 37A of the reinforcing plate portion 32A is not coplanar with the outer end surface 38A of the blade portion 29A, and the reinforcing plate portion 32A is disposed further inward than the outer end surface 38A (towards the base 28A), a portion of the air flows upward and diffuses in the portion further outward than the reinforcing plate portion 32A, resulting in poor air delivery efficiency. In this embodiment, since the upper reinforcing plate portion 32 is disposed on the outermost side of the upper blade portion 29, upward movement of air is prevented, thus improving air delivery efficiency compared to the conventional fan blade 4A. The thickness T3 of the upper reinforcing plate portion 32 in this embodiment (refer to...) Figure 9 The width M1 of the short side of the upper reinforcing plate 32 is formed to be 0.5mm (refer to...). Figure 8 The thickness is 5mm, but this is just one example. If the size of the fan motor 1 changes, the values ​​of the plate thickness T3 and width M1 will also change accordingly.

[0078] At the upper part of the middle section 35, a thin plate-shaped upper limiting plate section 34 is formed along the rotation direction F of the fan blade 4 (see reference). Figure 4 The upper limiting plate portion 34 is extended horizontally. The plate thickness T4 of this embodiment (refer to...) Figure 10 The length L1 of the upper limiting plate portion 34 in the long side direction is formed to be 0.5mm (refer to...). Figure 8The length L2 of the upper limiting plate portion 34 in the short side direction is 7mm (refer to...). Figure 10 The thickness is 0.5mm, but this is just one example. If the size of the fan motor 1 changes, the values ​​of the plate thickness T3, length L1, and length L2 will also need to be changed accordingly. The upper limiting plate portion 34 is formed to a length that does not contact the adjacent upper blade portion 29.

[0079] The upper surfaces of the upper base 28, the upper reinforcing plate 32, the upper limiting plate 34, and the inner side 36 are coplanar.

[0080] like Figure 5 As shown, the upper blade body 22 has multiple (five in this embodiment) upper connecting portions 39 that are connected to the two adjacent upper blade portions 29 and the upper reinforcing plate portion 32 and have a convex shape on the lower side. The upper connecting portions 39 are arranged at equal intervals.

[0081] In this embodiment, the upper base 28, upper blade portion 29, upper reinforcing plate portion 32, upper limiting plate portion 34 and upper connecting portion 39 are integrally formed, but they may also be partially or entirely set as independent components and joined together to form the upper blade body 22.

[0082] like Figure 6 As shown, the lower blade body 23 is formed of synthetic resin and has a cylindrical lower base 41 disposed in the center, an abutment plate 43 extending horizontally outward from the lower part 42 of the lower base 41, and a plurality of thin plate-shaped lower blade portions 44 (113 in this embodiment) extending substantially radially from the abutment plate 43.

[0083] On the inner surface portion 45 of the lower base portion 41, a plurality of (five in this embodiment) inner convex locking portions 46 extending in the vertical direction (longitudinal direction) are formed. The five inner convex locking portions 46 are arranged at equal intervals. On the outer surface portion 47 of the lower base portion 41, a plurality of (eight in this embodiment) outer convex locking portions 48 extending in the vertical direction (longitudinal direction) are formed. The eight outer convex locking portions 48 are arranged at equal intervals.

[0084] The lower blade portion 44 is curved into a roughly S-shape when viewed from above, and has an outer portion 50 where a lower reinforcing plate portion 49 is provided, a middle portion 52 where a lower limiting plate portion 51 is provided, and an inner portion 53 located between the lower base portion 41 and the middle portion 52. The diameter D4 of the lower blade portion 44, which is closer to the middle portion 52, is formed to be approximately 44 mm, but the diameter D4 may be varied depending on the equipment that mounts the fan motor 1, the required cooling performance, etc.

[0085] like Figures 9-11As shown, the plate thickness T5 on the upper side of the lower blade portion 44 is 0.15 mm, and the plate thickness T6 on the lower side of the lower blade portion 44 is 0.2 mm. The lower blade portion 44 tapers towards the front end from the bottom to the top. This is one example; if the dimensions of the fan motor 1 change, the values ​​of the plate thicknesses T5 and T6 of the lower blade portion 44 must also change accordingly. The plate thicknesses T5 and T6 are common in the outer portion 50, the middle portion 52, and the inner portion 53. Figure 7 As shown, the interval S2 between adjacent lower blade portions 44 is narrow on the lower base 41 side and wide on the outer side 50 side, but each lower blade portion 44 is arranged side by side at equal intervals.

[0086] A ring-shaped lower reinforcing plate portion 49 is provided at the lower part of the outer side portion 50. The outer peripheral surface portion 54 of the lower reinforcing plate portion 49 is coplanar with the outer end portion 55 of the lower blade portion 44. The plate thickness T7 of the lower reinforcing plate portion 49 in this embodiment (refer to...) Figure 9 The width M2 of the short side of the lower reinforcing plate 49 is formed to be 0.5mm (refer to...). Figure 7 The thickness is 5mm, but this is just one example. If the size of the fan motor 1 changes, the values ​​of the plate thickness T7 and width M2 will also need to be changed accordingly.

[0087] At the lower part of the middle portion 35, a lower limiting plate portion 51, formed as a thin plate, extends horizontally along the rotation direction F of the fan blade 4. The thickness T8 of the lower limiting plate portion 51 in this embodiment (refer to...) Figure 10 The length L3 of the long side of the lower limiting plate portion 51 is formed to 0.5mm (refer to...). Figure 7 The length L4 of the lower limiting plate portion 51 in the short side direction is 7mm (refer to...). Figure 10 The thickness is 0.5mm, but this is just one example. If the size of the fan motor 1 changes, the values ​​of the plate thickness T8, length L3, and length L4 will also need to be changed accordingly. The lower limiting plate portion 51 is formed to a length that does not contact the adjacent lower blade portion 44.

[0088] The upper surfaces of the lower base 41, the lower reinforcing plate 49, the lower limiting plate 51, and the inner side 53 are coplanar.

[0089] In this embodiment, the upper blade portion 29 and the lower blade portion 44 each have 113 blades, but the number of blades in the upper blade portion 29 and the lower blade portion 44 can be appropriately determined considering the size of the fan blade 4, the required airflow (cooling efficiency), etc. Therefore, for example, the number of blades in the upper blade portion 29 and the lower blade portion 44 can be set to 30 or more or 100 or more. In this invention, by setting a structure in which the upper blade portion 29 and the lower blade portion 44 abut against each other to form one blade portion, the length of the upper blade portion 29 and the lower blade portion 44 becomes 1 / 2, thus allowing for a thinner plate thickness to ensure the necessary strength. Therefore, in Figure 15In the conventional fan blade 4A shown, the number of blades is 97. In contrast, in the fan blade 4 of this embodiment, the number of blades can be set to 113, or 100 or more.

[0090] like Figure 6 As shown, the lower blade body 23 has multiple (five in this embodiment) lower connecting portions 56 that are connected to the two adjacent lower blade portions 44 and the lower reinforcing plate portion 49 and have a concave shape on the upper side. The lower connecting portions 56 are arranged at equal intervals.

[0091] In this embodiment, the lower base 41, lower blade portion 44, lower reinforcing plate portion 49, lower limiting plate portion 51 and lower connecting portion 56 are integrally formed, but they may also be partially or entirely set as independent components and joined together to form the lower blade body 23.

[0092] The yoke 21 and the lower blade body 23 are formed by insert molding (integral molding), and the locking groove 27 of the yoke 21 is locked to the inner convex locking part 46 of the lower blade body 23. Furthermore, the upper blade body 22 is positioned on the lower blade body 23 by locking the concave locking part 31 of the upper blade body 22 to the outer convex locking part 48 of the lower blade body 23. The upper blade body 22 and the lower blade body 23 are joined by fitting, bonding, or welding the upper base 28 and the lower base 41 together. At this time, the bottom of the upper base 28 abuts against the abutment plate 43, and the lower end 40 of the upper blade part 29 abuts against the upper end 57 of the lower blade part 44 (see reference). Figures 9-12 The upper connecting part 39 and the lower connecting part 56 are fitted together. For example... Figure 10 As shown, the upper blade portion 29, upper limiting plate portion 34, lower blade portion 44, and lower limiting plate portion 51 are generally formed in a U-shape in longitudinal section. This generally U-shape also includes shapes where the corners of the upper blade portion 29, upper limiting plate portion 34, lower blade portion 44, and lower limiting plate portion 51 are chamfered, shapes where the corners are formed into rounded shapes, and shapes where the upper blade portion 29, upper limiting plate portion 34, lower blade portion 44, and lower limiting plate portion 51 are themselves curved into a generally inverted C-shape. Furthermore, the yoke 21 and the lower blade body 23 can also be formed separately and joined together by bonding or welding.

[0093] The upper connecting portion 39 and the lower connecting portion 56 are provided in the same number, with five of each in this embodiment. However, the number of upper connecting portions 39 and lower connecting portions 56 can be appropriately determined considering factors such as the size of the fan blades 4, as long as the upper blade body 22 and the lower blade body 23 can be reliably fixed. Since the fan blades 4 are circular, it is preferable to have three or more for stable fixing. In addition, by making the number of upper connecting portions 39 and lower connecting portions 56 each a prime number of three or more, resonance during the rotation of the fan blades 4 can be suppressed, thereby achieving quieter operation.

[0094] In this embodiment, the fan blade 4 is composed of two parts: an upper blade body 22 and a lower blade body 23. Therefore, the upper blade portion 29 and the lower blade portion 44 are brought into contact to form one blade portion. Figure 15 As shown, when the blade portion 29A is composed of a single component, the vertical length of the blade portion 29A becomes longer. Therefore, to prevent deflection of the blade portion 29A, the plate thickness of the blade portion 29A needs to be increased to a certain extent. On the other hand, regarding the fan blade 4 in this embodiment, since the blade portion is divided into an upper blade portion 29 and a lower blade portion 44, the vertical length of the upper blade portion 29 and the lower blade portion 44 becomes half that of the blade portion 29A. Compared to the blade portion 29A, the amount of deflection is also less, thus allowing for a thinner plate thickness. Therefore, compared to the fan blade 4A, the number of blades in the blade portion can be increased. In this way, when the fan blade 4 and the fan blade 4A rotate at the same speed, the fan blade 4, with its larger number of blades, can release more air. Furthermore, even at a rotation speed slower than that of the fan blade 4A, an equivalent amount of air can be released as much as that of the fan blade 4A. By slowing down the rotation speed, quieter operation can be achieved.

[0095] like Figures 9-11 As shown, in this embodiment, one side 59, 60 of the fan blade 4 on the side of the rotation direction F and the other side 61, 62 on the side opposite to the rotation direction F of the fan blade 4 are inclined to make the upper blade portion 29 and the lower blade portion 44 thinner. However, it is also possible to... Figure 13 The shape shown is such that one side 59, 60 of the upper blade portion 29 and the lower blade portion 44 is inclined, while the other side 61, 62 is not inclined and is thinner. Additionally, as... Figure 14 As shown, it can also be configured such that one side 59, 60 of the upper blade portion 29 and the lower blade portion 44 is not inclined, while the other side 61, 62 is inclined and thinned.

[0096] The fan motor 1 is energized through wiring 10, thereby inducing magnetic force from the windings. The fan blades 4, equipped with a yoke 21 containing a permanent magnet 26, rotate around the shaft 24. As the fan blades 4 rotate, air is drawn into the fan blades 4 and the housing 5 through the first intake port 6, the second intake port 17, the third intake port 18, and the fourth intake port 19. The air is then expelled outwards from between adjacent upper blade portions 29 and lower blade portions 44 by the fan blades 4. The air expelled from the fan blades 4 is discharged to the outside of the housing 5 through the exhaust port 16.

[0097] The fan motor 1 is mounted on a relatively small information processing device (not shown) such as a smartphone, tablet, or laptop. On the outside of the exhaust port 16, there are heat sources (cooling objects) such as the CPU (central processing unit) of the information processing device (not shown), and heat sinks (not shown) that are in thermal contact with the heat sources (cooling objects), and the heat sources (cooling objects) are air-cooled by the air exhausted from the exhaust port 16.

[0098] The fan motor 1 can also be mounted on a projector (not shown) that is an optical projection device that enlarges and projects / displays images on a projection screen. It can deliver air from the exhaust port 16 to a heat source (cooling object) such as a light source of the projector, thereby air cooling the heat source (cooling object).

[0099] As described above, the fan blade 4 of this embodiment is a centrifugal fan blade 4, comprising multiple upper blade portions 29 and multiple lower blade portions 44. An upper limiting plate portion 34 extending along the rotational direction F of the fan blade 4 is located at the upper part of the upper blade portion 29, and a lower limiting plate portion 51 extending along the rotational direction F of the fan blade 4 is located at the lower part of the lower blade portion 44. By abutting the lower end portion 40 of the upper blade portion 29 against the upper end portion 57 of the lower blade portion 44, the upper blade portion 29, upper limiting plate portion 34, lower blade portion 44, and lower limiting plate portion 51 are formed into a generally U-shaped configuration. Therefore, the air released from the fan blade 4 is difficult to flow in the vertical direction due to the upper limiting plate portion 34 and the lower limiting plate portion 51, making air diffusion difficult. As a result, air can be released linearly from the fan blade 4.

[0100] Furthermore, regarding the fan blade 4 of this embodiment, a plurality of upper blade portions 29 are arranged in a ring side by side, and a plurality of lower blade portions 44 are arranged in a ring side by side. An annular upper reinforcing plate portion 32 is provided on the outer periphery of the upper portion of the plurality of upper blade portions 29, and an annular lower reinforcing plate portion 49 is provided on the outer periphery of the upper portion of the plurality of lower blade portions 44. Therefore, the upper blade portions 29 can be held in place by the upper reinforcing plate portion 32, and the lower blade portions 44 can be held in place by the lower reinforcing plate portion 49. This suppresses deformation and vibration of the upper blade portions 29 and lower blade portions 44, and also suppresses air diffusion and vibration noise.

[0101] Furthermore, regarding the fan blade 4 of this embodiment, the upper reinforcing plate portion 32 is disposed on the outermost periphery of the upper blade body 22, which has a plurality of upper blade portions 29 in its structure, and the lower reinforcing plate portion 49 is disposed on the outermost periphery of the lower blade body 23, which has a plurality of lower blade portions 44 in its structure. Therefore, near the air outlet of the fan blade 4, the upper reinforcing plate portion 32 and the lower reinforcing plate portion 49 make it difficult for air to flow in the vertical direction, thereby suppressing air diffusion. As a result, air can be released linearly from the fan blade 4.

[0102] Furthermore, regarding the fan blade 4 of this embodiment, a plurality of upper blade portions 29 extend radially from the upper base 28, and a plurality of lower blade portions 44 extend radially from the lower base 41. The upper blade portions 29 have portions without the upper limiting plate portion 34 on the upper base 28 side, and the lower blade portions 44 have portions without the lower limiting plate portion 51 on the lower base 41 side. Therefore, sufficient air can be drawn into the fan blade 4 from the portions of the upper blade portions 29 without the upper limiting plate portion 34 and the portions of the lower blade portions 44 without the lower limiting plate portion 51.

[0103] Furthermore, regarding the fan blade 4 of this embodiment, the upper blade portion 29, from the upper base portion 28 side to the outermost peripheral side, consists of a portion without the upper limiting plate portion 34, a portion with the upper limiting plate portion 34, and a portion with the upper reinforcing plate portion 32. The lower blade portion 44, from the lower base portion 41 side to the outermost peripheral side, consists of a portion without the lower limiting plate portion 51, a portion with the lower limiting plate portion 51, and a portion with the lower reinforcing plate portion 49. Therefore, when air is drawn in from the portion near the upper base portion 28 and the base portion 41 that does not have the upper limiting plate portion 34 and the lower limiting plate portion 51, the air is less likely to flow vertically towards the outermost peripheral side, thereby allowing the air to be released linearly from the outlet of the fan blade 4.

[0104] Furthermore, regarding the fan blade 4 of this embodiment, the upper plate thickness T1 of the upper blade portion 29 is thicker than the lower plate thickness T2, and the lower plate thickness T6 of the lower blade portion 44 is thicker than the upper plate thickness T5. Therefore, air flowing along the upper blade portion 29 tends to flow downwards, while air flowing along the lower blade portion 44 tends to flow upwards. As a result, air concentrates at the contact portion between the upper blade portion 29 and the lower blade portion 44, where the air velocity increases, allowing the high-velocity air to be released from the outlet of the fan blade 4.

[0105] Furthermore, regarding the fan blade 4 of this embodiment, a plurality of upper blade portions 29 extend radially from the upper base portion 28, and a plurality of lower blade portions 44 extend radially from the lower base portion 41, with the upper base portion 28 and the lower base portion 41 joined together. Therefore, the center sides of the upper blade body 22 and the lower blade body 23 can be firmly connected.

[0106] Furthermore, the fan blade 4 of this embodiment includes: an upper blade body 22, which is configured to have multiple upper blade portions 29 and an upper base portion 28; and a lower blade body 23, which is configured to have multiple lower blade portions 44 and a lower base portion 41; the fan blade 4 has an upper connecting portion 39 and a lower connecting portion 56 for fixing the upper blade body 22 and the lower blade body 23, and the upper connecting portion 39 and the lower connecting portion 56 are provided in a prime number of locations of 3 or more. Therefore, resonance during the rotation of the fan blade 4 can be suppressed to achieve noise reduction.

[0107] Furthermore, in this embodiment, the fan blades 4 have the same number of upper blades 29 and lower blades 44, totaling 100 or more. With 100 or more upper blades 29 and lower blades 44, a large amount of air can be released.

[0108] Furthermore, regarding the fan blade 4 in this embodiment, the diameter D3 of the portion having the upper limiting plate portion 34 is approximately the same as the diameter D1 of the first air intake 6 formed on the housing 5 that houses the fan blade 4. Therefore, the flow of air drawn into the housing 5 from the first air intake 6 is difficult to be restricted by the upper limiting plate portion 34, and air can be efficiently drawn into the fan blade 4.

[0109] The fan motor 1 of this embodiment includes fan blades 4, a housing 5 that houses the fan blades 4, and a motor unit 9. Therefore, the fan motor 1 can be assembled as a unit in various information processing devices that have a heat source (cooling object).

[0110] The information processing apparatus of this embodiment includes a fan motor 1 as a cooling mechanism. Therefore, the heat source (cooling object) of the information processing apparatus can be air-cooled using the air discharged from the fan motor 1.

[0111] The projector in this embodiment includes a fan motor 1 as a cooling mechanism. Therefore, the heat source (cooling object) of the projector can be air-cooled using the air discharged from the fan motor 1.

[0112] Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. For example, the yoke can also be formed by insert molding (integral molding) with the upper blade body instead of the lower blade body.

Claims

1. A fan blade that is a fan blade of a centrifugal fan, characterized by, the fan blade having a plurality of first blade portions and a plurality of second blade portions, a first restriction plate portion being provided at an upper portion of the first blade portion so as to extend in a rotation direction of the fan blade, a second restriction plate portion being provided at a lower portion of the second blade portion so as to extend in the rotation direction of the fan blade, the first blade portion, the first restriction plate portion, the second blade portion, and the second restriction plate portion being formed in a substantially C shape by abutting the lower end portion of the first blade portion with the upper end portion of the second blade portion.

2. The fan blade according to claim 1, characterized by, the plurality of first blade portions being arranged in parallel in a ring shape, the plurality of second blade portions being arranged in parallel in a ring shape, a first reinforcing plate portion being provided at an outer peripheral portion of the upper portion of the plurality of first blade portions in a circular ring plate shape, a second reinforcing plate portion being provided at an outer peripheral portion of the upper portion of the plurality of second blade portions in a circular ring plate shape.

3. The fan blade according to claim 2, characterized by, the first reinforcing plate portion being provided at an outermost peripheral portion of a first blade body that structurally has the plurality of first blade portions, the second reinforcing plate portion being provided at an outermost peripheral portion of a second blade body that structurally has the plurality of second blade portions.

4. The fan blade according to claim 3, characterized by, the plurality of first blade portions being provided so as to extend in a substantially radial shape from a first base portion, the plurality of second blade portions being provided so as to extend in a substantially radial shape from a second base portion, a portion not having the first restriction plate portion being present at the first base portion side of the first blade portion, a portion not having the second restriction plate portion being present at the second base portion side of the second blade portion.

5. The fan blade according to claim 4, characterized by, the first blade portion being, from the first base portion side to the outermost peripheral portion side, a portion not having a first restriction plate portion, a portion having a first restriction plate portion, and a portion having the first reinforcing plate portion, the second blade portion being, from the second base portion side to the outermost peripheral portion side, a portion not having a second restriction plate portion, a portion having a second restriction plate portion, and a portion having the second reinforcing plate portion.

6. The fan blade according to claim 1, characterized by, a plate thickness of an upper side of the first blade portion being made thicker than a plate thickness of a lower side of the first blade portion, a plate thickness of a lower side of the second blade portion being made thicker than a plate thickness of an upper side of the second blade portion.

7. The fan blade according to claim 1, characterized by, the plurality of first blade portions being provided so as to extend in a substantially radial shape from a first base portion, the plurality of second blade portions being provided so as to extend in a substantially radial shape from a second base portion, the first base portion and the second base portion being joined.

8. The fan blade of claim 7, wherein, provided with: a first blade body configured to have the plurality of first blade portions and the first base portion; and a second blade body configured to have the plurality of second blade portions and the second base portion; the fan blade having a joint portion that fixes the first blade body and the second blade body, ​ The connecting portions are provided at 3 or more prime number of sites.

9. The fan blade according to claim 1, wherein The first blade portions and the second blade portions are the same number, 100 or more.

10. The fan blade according to claim 5, wherein The diameter of the portion of the fan blade having the first limiting plate portion inwardly is substantially the same as the diameter of an air intake formed on a housing that accommodates the fan blade.

11. A fan motor characterized by, Possessing: The fan blade according to any one of claims 1 to 10; A housing that accommodates the fan blade; and A motor unit.

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

13. A projector characterized by comprising: Possessing the fan motor according to claim 11 as a cooling mechanism.

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