JP2013053563A - Blade for centrifugal fan device, centrifugal fan device, and electronic device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade for a centrifugal fan device reducing the size of an air vortex generated at a distal end of a blade part by dividing the flow and preventing recombination of the divided vortices by separating the directions of the flow of the vortices to reduce noise so that a wide range of cooling is allowed, and to provide the centrifugal fan device, and to provide an electronic device including the same.SOLUTION: A blade part 22 of a centrifugal fan is divided in the middle of a centrifugal fan thickness direction so as to be a first blade part 25 and a second blade part 26. The first blade part 25 and the second blade part 26 extend to different directions with each other in a radial direction of the centrifugal fan.

Description

  The present invention relates to a centrifugal fan device used for cooling a heating element such as an ultra-compact processing unit (hereinafter referred to as MPU) mounted inside a housing of an electronic device, from a heat receiving member thermally connected to the heating element. A blade for a centrifugal fan device, a centrifugal fan device that forcibly blows and cools the heat dissipator after efficiently transporting heat to the heat dissipator by a system such as a heat pipe or liquid refrigerant circulation, and an electronic device including the same It relates to equipment.

  Recently, the speed of data processing in computers has been very rapid, and the clock frequency of MPU has become much higher than before.

  As a result, the amount of heat generated by the MPU increases, and not only the conventional method of dissipating heat by bringing a heat sink having a heat radiation fin into contact with the heat generator, but also a method of directly cooling the heat sink with a fan, or the heat generator and heat A heat sink module that transports heat from a connected heat receiving body to a heat sink using a heat pipe is configured, and the heat sink is forcibly cooled by blowing air from a fan, and a liquid refrigerant with high thermal conductivity is pumped. For example, a method for forcibly blowing and radiating heat from a heat radiating body that is forcibly circulated by the centrifugal fan device and is thermally transported between the heat receiving body and the heat radiating body is indispensable.

  On the other hand, the improvement of the cooling performance of the centrifugal fan device described above largely depends on the improvement of the air blowing performance such as high air volume and high static pressure, and the air blowing performance of the centrifugal fan device usually increases the rotation speed of the centrifugal fan. However, since the wind noise (hereinafter referred to as fan noise) of the blade portion of the centrifugal fan tends to increase, various blade portions of the centrifugal fan portion are reduced in order to reduce the fan noise. Shapes and orifice shapes have been proposed.

  Generally, such fan noise is classified into discrete frequency noise and broadband random noise. In particular, discrete frequency noise is air on the rotating surface (positive pressure surface and negative pressure surface) of the blade part (also referred to as a blade plate). This is due to air vortices generated due to fluctuations in air pressure that occur each time the blade portion that rotates is passing.

  In other words, since discrete frequency noise is generated in synchronization with the passage of the blade portion, it is harmonic noise having a fundamental frequency that is the product of the number of blade portions and the number of rotations of the fan. Therefore, it is also known that reducing the generation of discrete frequency noise, that is, large air vortices, is effective in reducing fan noise.

  As a conventional method for reducing discrete frequency noise, there is a method in which a step is provided at the outer peripheral ends of two blades facing each other of a fan, and an annular plate is provided around the rotation axis of the blade (for example, Patent Document). 1).

JP 2009-257113 A

  However, in the case where there is a step at the outer peripheral edge of the blade as described above and a circular plate centered on the rotation axis of the blade is provided at the step, the vortex that is the source of the discrete frequency noise generated at the fan tip is shunted. Although the centrifugal fan device is thin, the distance between the vortices generated at the top and bottom ends is close, and the vortex movement direction is the same. May return. As a result, it has been difficult to significantly reduce noise.

  In addition, the direction of the wind from the rotating blade is unidirectional, and the wind blown from the fan device is biased, which is suitable for cooling in a narrow range, while there is a problem in cooling in a wide range.

  Therefore, in view of the above problems, the present invention reduces the vortex of the air generated at the tip of the blade part by dividing and diminishing it, and prevents the recombination of the divided vortices by dividing the flow direction of those vortices. It is an object of the present invention to provide a centrifugal fan device blade, a centrifugal fan device, and an electronic apparatus including the same.

  In order to achieve the above object, the present invention is a centrifugal fan device blade comprising a radially extending blade portion, wherein the blade portion is integral with the thickness direction of the centrifugal fan device blade on the radially inner side. 1 region and a second region divided in the thickness direction of the centrifugal fan device blade on the radially outer side, and the plurality of tip portions divided in the second region are for the centrifugal fan device A blade for a centrifugal fan device characterized by extending in different directions in the circumferential direction of the blade, the centrifugal fan device including the blade, and an electronic device including the centrifugal fan device.

  According to the present invention, the vortex of the air generated at the tip of the blade is divided and divided, and the flow direction of those vortices is divided to prevent recombination of the divided vortices and reduce noise. it can. Further, by dispersing the wind pushed out from the blade, the blown-out wind can be sent out in a wide range, and a wide range of cooling can be enabled.

  Further, by optimizing the shape of the blade and the position where the blade is divided into two from the middle, the ability to suck in outside air and the ability to cool by blowing out can be improved.

Overview of centrifugal fan device in an embodiment of the present invention The perspective view of the blade of the centrifugal fan apparatus in the Example of this invention The enlarged view of the blade of the centrifugal fan apparatus in the Example of this invention The figure which shows the shape of the braid | blade of the centrifugal fan apparatus in the Example of this invention. The perspective view of the other form of the reinforcement board of the braid | blade of the centrifugal fan apparatus in the Example of this invention. The figure which shows operation | movement of the blade of the centrifugal fan apparatus in the Example of this invention. The figure which shows the shape of the other blade of the centrifugal fan apparatus in the Example of this invention.

  The invention according to claim 1 is a blade for a centrifugal fan device comprising a blade portion extending in the radial direction, and the blade portion is integrated in the thickness direction of the centrifugal fan device blade on the radially inner side. And a second region divided in the thickness direction of the centrifugal fan device blade on the radially outer side, and the plurality of tip portions divided in the second region are arranged around the periphery of the centrifugal fan device blade. The centrifugal fan device blades are characterized by extending in different directions in the direction, and the inhaled air is obtained by dividing the tip of the blade part from the middle and extending it in different directions in the radial direction of the blade part. The air vortex that causes noise generated at the tip of the blade portion can be reduced. Furthermore, the location where the vortex is generated can be separated, recombination of the divided vortex can be prevented, and the noise of the centrifugal fan device can be reduced. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible.

  The invention according to claim 2 includes a drive unit, a hub unit that houses the drive unit, a blade that has a blade unit that extends around the hub unit, and a frame that supports the blade and includes an intake port. The blade portion includes a first region that is integral in the thickness direction of the blade on the radially inner side, and a second region that is divided into a plurality in the thickness direction of the blade on the radially outer side, and in the second region, The plurality of divided tip portions extend in different directions in the circumferential direction of the blade. The centrifugal fan device is characterized in that the tip of the blade portion is divided from the middle and is different in the radial direction of the blade. By stretching the air, it is possible to divide the sucked air and reduce the vortex of the air that causes the noise generated at the tip of the blade. It can be, to prevent the recombination of the divided vortex, thereby reducing the noise of the centrifugal fan device. Further, the air pushed out from the blade can be dispersed, and the blown-out air can be sent out over a wide range, so that cooling over a wide range is possible.

  The invention according to claim 3 is characterized in that the plurality of tip portions of the blade portion extend with curves in different directions, and the centers of the respective curves are located before and after the rotation direction with respect to the blade. The centrifugal fan device according to claim 2, wherein the plurality of tip portions of the blade portion have curvatures opposite to each other, so that the location where the air vortex is generated and the location where the air vortex is generated can be separated. Can be prevented, and the noise of the centrifugal fan device can be reduced. Furthermore, after the outside air is sucked into the centrifugal fan device, it is smoothly blown out from the blade portion along the curved surface, so that the air blowing efficiency of the blade can be improved. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible.

  The invention described in claim 4 is characterized in that the boundary between the first region and the second region is outside the outer diameter of the air inlet provided in the frame. It is a fan device, and by not overlapping the part where the blade part is divided and the surface of the intake port, a large amount of outside air can be sucked from the intake port at the part where the blade part is not divided. Can be used as air for cooling the blowout.

  According to a fifth aspect of the present invention, there is provided an electronic apparatus comprising the centrifugal fan device according to the second aspect, wherein the blade portions are divided in the axial direction of the blade and are mutually separated in the radial direction of the centrifugal fan. By providing the electronic device with the centrifugal fan device extending in different directions, noise caused by the centrifugal fan device in the electronic device can be reduced.

(Example)
Embodiments of the present invention will be described below with reference to the drawings. In each drawing, the cover side is described as the upper side and the frame side is described as the lower side.

  1A and 1B are schematic views of a centrifugal fan device according to an embodiment of the present invention. FIG. 1A is a perspective view from above, and FIG. 1B is a perspective view from below.

  First, as shown in FIG. 1A, the fan casing 12 of the centrifugal fan device 11 is composed of a frame 12a located at the lower part and a cover 12b located at the upper part.

  However, the cover 12b is not necessarily essential, and for example, a wall of another member may be substituted.

  Here, in the frame 12a, the side wall 12aa and the bottom wall 12ab are integrally formed by resin molding, die casting of aluminum alloy, press molding, or the like, and the air sucked into the fan casing 12 in the two directions to the outside. An exhaust port 13 for exhausting air is disposed, and a substantially circular air intake port 14a through which air sucked from the surroundings passes is disposed on the bottom wall 12ab (see FIG. 1B).

  On the other hand, the cover 12b is formed into a plate shape by stamping or resin molding of a metal material such as steel, aluminum, or copper, and a substantially circular intake port 14b through which air sucked in from the periphery is passed in the center. It is arranged.

  Since the fan casing 12 rotatably accommodates the blade 15 that is rotationally driven, the pair of air inlets 14a and air inlets 14b are disposed to face each other with the blades 15 therebetween.

  Further, a motor (not shown) which is a drive unit housed and attached in the hub portion 21 rotates the blade portion 22 of the blade 15. For example, a motor is configured by including a stator around which a coil is wound, and a rotor provided around the stator and provided with an annular magnet inside thereof, and a current is passed through the coil of the stator.

  Here, the material of the blade 15 is formed by integral molding using a resin material such as polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), or polyethylene terephthalate (PET).

  With the configuration as described above, the air sucked from both the air inlet 14a and the air inlet 14b is opposite to each other in the direction of the rotating shaft 18 fixed at the inner center of the hub portion 21 of the blade 15 (the collision). Inhalation).

  FIG. 2 is a perspective view of a blade of a centrifugal fan device according to an embodiment of the present invention, (a) is a perspective view from above, and (b) is a perspective view from below.

  As shown in FIG. 2, the blade 15 includes a hub portion 21, a plurality of blade portions 22 extending from the hub portion 21, and an annular reinforcing plate 30 that reinforces the strength of the blade portion 22 on the outer periphery of the hub portion 21. The blade 15 rotates in the clockwise direction R.

  Here, the blade portion 22 extended from the hub portion 21 includes a first region that is integral in the thickness direction of the blade on the radially inner side and a second region that is divided into a plurality in the thickness direction of the blade on the radially outer side. And an area. In the second region, the first blade portion 25 or the second blade portion 26 is divided. That is, it is divided after passing through the reinforcing plate 30 and is divided into a first blade portion 25 and a second blade portion 26 (details will be described later).

  Further, the annular reinforcing plate 30 provided on the outer periphery of the hub portion 21 can increase the strength of the base of the blade portion 22 extending outward from the hub portion 21. That is, by forming a part of the blade portion 22 integrally with the flat portion of the reinforcing plate 30 (the thick line portion of B), the blade portion 22 can be fixed by both the hub portion 21 and the reinforcing plate 30. it can. By doing so, the blade portion 22 can withstand the rotational force of the blade 15 even when the number of blades of the blade portion 22 is increased to reduce the blade thickness in order to improve the performance of the blade 15. it can. There is also a wind rectification effect.

  The outer diameter of the reinforcing plate 30 is preferably the same as or slightly smaller than the outer diameter of the intake port 14a or the intake port 14b (see FIG. 1). That is, the outer diameter of the reinforcing plate 30 ≦ the outer diameter of the intake port 14a and the intake port 14b. With this configuration, the wide side surface of the blade portion 22 that is not divided into the first blade portion 25 and the second blade portion 26 without colliding the air sucked from the vertical direction of the intake port 14a and the intake port 14b. Thus, air can be effectively embraced and sent out to the outer peripheral side of the blade portion 22 along the curved surface of the blade portion 22.

  In some cases, the reinforcing plate 30 is not provided. However, as described above, a problem remains in the strength of the blade portion 22. In some cases, the outer diameter of the reinforcing plate 30 is larger than the outer diameter of the intake port 14a or the intake port 14b. However, if the outer diameter of the reinforcing plate 30 is increased, the size of the blade 15 may be increased accordingly. .

  In the present embodiment, the first blade portion 25 and the second blade portion 26 have a long distance from the hub portion 21 and the blade length is long in this case. Is longer, that is, the first blade portion 25 is preferably disposed on the side of the intake port 14b where the opening of the intake port is large.

  The distance from the hub portion 21 of the first blade portion 25 or the second blade portion 26 may be the same length, but the longer blade, that is, the first blade portion 25 is connected to the opening of the intake port. By disposing on the large intake port 14b side, a large amount of air that can be inhaled can be easily carried out to the outside of the blade 15.

  At this time, the tips of the blade portion 22, that is, the first blade portion 25 and the second blade portion 26 are located outside the outer diameter of the intake port so as to be hidden from the intake ports 14a and 14b (see FIG. 1). It is desirable that the size of the intake port be changed according to the ratio of the lengths of the first blade portion 25 and the second blade portion 26.

  That is, the gap between the upper end and the lower end of the blade portion 22 in the thickness direction of the blade 15 and the cover 12b and the bottom wall 12ab (see FIG. 1) of the fan casing 12 is narrowed, and is generated due to a difference in atmospheric pressure at the tip of the blade portion 22. It is possible to prevent the air vortex causing noise from moving over the surface of the blade portion 22 to the adjacent blade and coalescing with the adjacent air vortex.

  The first blade portion 25 is a so-called forward blade that curves forward in the rotational direction, and the second blade portion 26 is a so-called backward blade that curves backward in the rotational direction.

  By curving the blade portion 22 in this way, the blade portion 22 has a streamlined surface in the radial direction, so that air sucked from the axial direction of the centrifugal fan device 11 can be smoothly discharged without resistance, The air blowing efficiency of the blade unit 22 of the fan device 11 can be improved.

  The shape of the blade portion 22 of the blade 15 will be described with reference to FIG. 3A and 3B are enlarged views of a blade of the centrifugal fan device according to the embodiment of the present invention, in which FIG. 3A is a top view of the centrifugal fan, and FIG. 3B is a side view of the centrifugal fan viewed from the AA direction of FIG. FIG.

  In FIG. 3, as described above, the first blade portion 25 is curved forward in the rotational direction, and the second blade portion 26 is curved backward in the rotational direction. Then, the end portion Q of the second blade portion 26 is positioned between the pitches P between the end portions of the first blade portion 25 (details will be described later).

  Preferably, the end portion Q of the second blade portion 26 is located in the middle of the pitch P between the end portions of the first blade portion 25. By arranging in this way, the distance between the air vortex generated in the first blade portion 25 and the air vortex generated in the second blade portion 26 (distance in the circumferential direction of the blade 15) can be most separated. Yes (details will be described later).

  Further, the position C, which is the boundary at which the first blade portion 25 and the second blade portion 26 start to be divided, is based on the outer diameter of the intake port 14a and the intake port 14b (see FIG. 1) in the radial direction of the blade 15. Is also located outside.

  By configuring in this way, the blade portion 22 is not yet divided by being removed from the surface of the intake port 14a or the intake port 14b (see FIG. 1) and the branch point C where the blade portion 22 starts to be divided and not overlapping. A large amount of outside air can be sucked from the intake port 14a and the intake port 14b (see FIG. 1) at a wide side portion that is not present, and this can be used as air for cooling the blowout.

  Depending on the size of the blade 15, the first blade portion 25 and the second blade portion 26 have such a degree that air vortices generated in the first blade portion 25 and the second blade portion 26 do not recombine. The length (the length from the branch point C to the outer periphery of the blade 15) and a curved surface are sufficient.

  Here, the outer diameter of the reinforcing plate 30, the outer diameter of the intake port 14 a and the intake port 14 b, the position of the point C that is a branch point of the blade portion 22, and the outer diameter of the blade 15 are summarized. Here, the radius and the distance from the center of the blade 15 are shown. That is, the outer diameter of the reinforcing plate 30 ≦ the outer diameter of the intake port 14a or the intake port 14b <the distance to the point C that is the branching point of the blade portion 22 <the outer diameter of the blade 15.

  As described above, in the first blade portion 25 and the second blade portion 26, the distance from the hub portion 21 is longer in the first blade portion 25 than in the second blade portion 26. As shown in (b), a step is formed at the boundary between the first blade portion 25 and the second blade portion 26. By providing this step, the distance between the air vortex generated at the first blade portion 25 and the air vortex generated at the second blade portion 26 (the axial distance of the blade 15) can be separated. The distance between the air vortex generated in the first blade portion 25 and the air vortex generated in the second blade portion 26 can be separated three-dimensionally (obliquely in the vertical direction).

  In addition, the first blade portion 25 is longer with respect to the length (also the diameter) of the first blade portion 25 and the second blade portion 26. Thereby, the cooling performance of the centrifugal fan device can be improved.

  In this embodiment, the outer diameter of the first blade portion 25 is 44 mmφ, the outer diameter of the second blade portion 26 is 42 mmφ, the outer diameter of the reinforcing plate 30 is 32 mmφ, and the outer diameters of the intake ports 14 a and 14 b are 32 mmφ. The diameter connecting the branch points is 33.5 mmφ. At this time, the balance between the noise and the air volume is good, and the cooling performance is the best under the same noise conditions.

  The lengths of the first blade portion 25 and the second blade portion 26 are not limited to this, but in consideration of the location of the air vortex that causes the fan noise, this embodiment Is appropriate.

  In addition, the width of each blade in the rotation axis direction of the blade 15 of the first blade portion 25 and the second blade portion 26 is the width of the second blade portion 26 side, that is, the side provided with the portion that receives the rotary bearing. It is better for the strength of the blade 15 to make this larger in manufacture.

  Here, the shape of the tip of the blade portion 22 will be described in detail with reference to FIG. FIG. 4 is a view showing the shape of the blade of the centrifugal fan device according to the embodiment of the present invention.

  The blade portion 22 extends from the hub portion 21 (see FIG. 2), and is joined or integrally formed with the reinforcing plate 30 so that the strength of the blade portion 22 is increased.

  As shown in FIG. 4, the blade portion 22 extending radially outward from the reinforcing plate 30 is divided into two blade portions at point C. The position of the point C is determined by the outer diameter of the blade 15, the outer diameters of the intake port 14a and the intake port 14b, and the desired fan performance.

  The first blade portion 25 is curved forward in the rotational direction, and the second blade portion 26 is curved backward in the rotational direction. Each blade portion is curved with a gentle curvature. The first blade part 25 is curved along a part of the circumference of the circle M, and the second blade part 26 is curved along a part of the circumference of the circle N.

  In addition, although the present Example demonstrates the case where each blade part curves along the circumference of a circle | round | yen, if it curves smoothly other than a hyperbola, it does not need to be restricted to a circle | round | yen.

  When the end of the first blade portion 25 that is the end of each blade portion is X, Y, the end of the second blade portion 26 is Z, and the center of the blade 15 is O, the line segment OZ has an angle XOY. The point that becomes a bisecting line segment was defined as Z. Thereby, the vortex of the air generated by the upper and lower blades is discharged at the most distant position, and the effect that these vortices do not recombine can be exhibited particularly.

  In this embodiment, the line segment OZ is a line obtained by bisecting the angle XOY, but the line segment OZ is within the angle XOY, and (1/3) × ∠XOY <∠XOZ <(2/3). ) × ∠XOY, the air vortex generated by the upper and lower blades can be prevented from recombining, and the blades of the first blade portion 25 and the second blade portion 26 adjacent to each other can be exhibited. Does not overlap and does not hinder the blowing performance of the blade.

  That is, the blade portion 22 has a first region that is integral in the thickness direction of the blade 15 in the radial direction (inside from the point C) and a second region that is divided into two in the thickness direction of the blade 15 (outside from the point C). ) And the two tip portions divided in the second region extend in different directions in the circumferential direction of the blade 15.

  The center of the circle M along which the first blade portion 25 is along is on the front side in the rotational direction, and the center of the circle N along which the second blade portion 26 is along is on the rear side in the rotational direction.

  In this embodiment, the outer diameter of the blade 15 is 44 mmφ, the outer diameter of the reinforcing plate 30 is 32 mmφ, the outer diameters of the intake ports 14 a and 14 b are 32 mmφ, and the diameters of the circle M and the circle N at that time are 33 mmφ. is there.

  However, the diameters of the circle M and the circle N are not necessarily equal. What is necessary is just to determine the value of a diameter suitably so that the 1st blade part 25 and the 2nd blade part 26 may become alternate seeing from the centrifugal fan apparatus 11 upper direction.

  Further, the present invention is not limited to these numerical values. Depending on the size of the centrifugal fan device 11 and the wind path resistance, the outer diameter of the blade 15 is 40 to 60 mmφ, the outer diameter of the reinforcing plate 30 is 26 to 45 mmφ, and the intake port 14a and the intake air. The outer diameter of the opening 14b is appropriately set within 30 to 45 mmφ.

  The other form of the reinforcement board 30 is demonstrated using FIG. FIG. 5 is a perspective view of another form of the reinforcing plate of the blade of the centrifugal fan device according to the embodiment of the present invention. FIG. 5A is a reinforcing plate in which the reinforcing plate 30 is in a ring shape. (B) is a case where the reinforcing plate 30 is not attached.

  As shown in FIG. 5A, since the reinforcing plate 30 has a ring shape, the outside air sucked from the intake port 14a and the intake port 14b also on the side surface of the blade portion 22 between the hub portion 21 and the reinforcing plate 30. Can be easily held, and the amount of outside air to be taken in can be increased.

  The reinforcing ring of the reinforcing plate 30 provided closer to the tip of the blade 15 contributes to increasing the strength of the blade portion 22, but if it is too close to the tip of the blade 15, the air blowing efficiency of the blade portion 22 decreases, There is a possibility that the lengths of the branched first blade portion 25 and second blade portion 26 cannot be secured. Accordingly, the size may be set to satisfy the relational expression of the outer diameter of the reinforcing plate 30 described above. The inner diameter of the reinforcing plate 30 at this time, that is, the ring width of the reinforcing plate 30 may be appropriately set to a width that can strengthen the blade of the blade portion 22.

  Further, when the number of blade portions 22 is small and the thickness of each blade can be sufficiently increased and the strength of the blade portion 22 is sufficient, the reinforcing plate 30 may not be attached as shown in FIG.

  Thus, the weight of the blade 15 can be further reduced by making the reinforcing plate 30 into a ring shape or not providing the reinforcing plate 30.

  The operation of the blade 15, particularly the air flow in the fan will be described with reference to FIG. 6. FIG. 6 is a diagram illustrating the operation of the blades of the centrifugal fan device according to the embodiment of the present invention.

  In FIG. 6, the blade 15 rotates in the clockwise R direction, and the outside air sucked from both directions of the intake port 14 a and the intake port 14 b is a first along the blade portion 22 divided from the middle. In the vicinity of the tip portions of the blade portion 25 and the second blade portion 26, a vortex A and a vortex B are formed as indicated by thick arrows.

  Then, the vortices generated in the vicinity of the tip portions of the first blade portion 25 and the second blade portion 26 are not coupled again, and the first blade portion 25 and the second blade portion 26 are externally connected from the tip ends of the blades. Exhausted. That is, the vortex is pushed out in the direction along the curve of the blade surface and the resultant direction of the rotation direction of the blade 15.

  That is, the vortex A pushed out from the first blade portion 25 that is the forward blade is pushed toward the rotation direction of the blade 15 to become the vortex C, and the vortex B pushed out from the second blade portion 26 that is the backward blade. Becomes the vortex D pushed out to the rear side in the rotation direction of the blade 15.

  Furthermore, the moving speed (air flow) of the vortex C pushed out by the rotational force of the blade 15 is faster than the moving speed of the vortex D.

  In FIG. 6, the vortex A and the vortex B are illustrated at positions separated from each other for ease of explanation, but in reality, the same applies to the first blade portion 25 and the second blade portion 26 above and below the blade portion 22. I can say.

  As a result, the vortices diverted by the first blade portion 25 and the second blade portion 26 that divide the blade portion 22 have different directions and speeds to be pushed to the outside. Bonding can be prevented.

  Therefore, by having the blade divided into two having different shapes and extending directions, the air that should have become one large vortex can be divided into two small vortices. Thus, noise can be reduced by reducing the air vortex, and the noise of the centrifugal fan device 11 can be reduced.

  That is, the blade part 22 is provided with the first blade part 25 and the second blade part 26 that extend in different directions in a curved line, thereby diverting the vortex in different directions, and the divided vortices are combined. Therefore, the vortex generated at the tip of the blade portion 22 is reduced, the noise generated by reducing this vortex can be reduced, and the noise of the centrifugal fan device 11 can be reduced.

  Moreover, the air pushed out from the blade part 22 in different directions of the first blade part 25 and the second blade part 26 can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling is possible. .

  In addition, since the cooling air can be blown over a wide range, the heat radiating portion such as the heat generating member and the heat pipe can be widely arranged and cooled around the centrifugal fan device 11, and the heat radiating and cooling can be enhanced.

  In addition, it is desirable that the height in the rotation axis direction of the first blade portion 25 and the second blade portion 26, that is, the width of the blade is preferably the same width, and the air vortex that is generated with the same width is equally divided, Since a large vortex that causes a large noise does not occur, the noise is reduced compared to a case where the width is different, so that the same width is preferable.

  Further, in the present embodiment, the place where the air vortex is generated is divided by the first and second blade portions having different directions extending from the branch point C (see FIG. 3). The blade portion may be provided.

  In addition, by mounting the above-described centrifugal fan device on an electronic device such as a notebook PC, it is possible to provide an electronic device that ensures sufficient silence while satisfying air cooling performance.

  Here, another shape of the first blade portion 25 and the second blade portion 26 will be described with reference to FIG. FIG. 7 is a view showing the shape of another blade of the centrifugal fan device according to the embodiment of the present invention.

  In FIG. 7A, the blade shape of the first blade portion 25 is a flat plate, and the blade shape of the second blade portion 26 is a reverse blade. In FIG. 7B, the blade shape of the first blade portion 25 is a forward wing, and the blade shape of the second blade portion 26 is a flat plate.

  Both of them are the same as in the case of the present embodiment described above in terms of air flow and function, and the same effects can be obtained. However, in this embodiment, the wind can be sent out in a wider range, and a wide range of cooling is possible.

  As described in the examination results below, the outside air sucked from the intake port 14a and the intake port 14b is easy to be smoothly blown without resistance because a forward blade and a reverse blade are combined rather than a centrifugal fan of a blade using a flat plate. The blade centrifugal fan is better in terms of air cooling performance and fan noise.

  That is, as a result of intensive studies by the inventor, in the case of a blade in which the first blade portion 25 is a forward blade and the second blade portion 26 is a backward blade at a noise value at the same rotational speed as compared with the conventional example. The improvement of 3 dB could be improved by 2 dB in the case where the blade shape of the first blade portion 25 is a flat plate and the blade shape of the second blade portion 26 is a reverse blade.

  Further, in comparison with the conventional example, the cooling performance at the same noise of the fan is lowered by 4.5 ° C. in the case where the first blade portion 25 is a forward blade and the second blade portion 26 is a backward blade. However, in the case where the blade shape of the first blade portion 25 is a flat plate and the blade shape of the second blade portion 26 is a reverse blade, the temperature could be lowered by 2.5 ° C.

  A blade for a centrifugal fan device, a centrifugal fan device, and an electronic device including the same according to the present invention can cool an MPU and various heat-generating electronic components mounted in a housing, and require a quieter note. This is useful for PCs, PC servers, audio equipment, video equipment, and the like.

DESCRIPTION OF SYMBOLS 11 Centrifugal fan apparatus 12 Fan casing 12a Frame 12b Cover 12aa Side wall 12ab Bottom wall 13 Exhaust port 14a Inlet port 14b Inlet port 15 Blade 21 Hub part 22 Blade part 25 First blade part 26 Second blade part 30 Reinforcing plate

In order to achieve the above object, the present invention is a centrifugal fan device blade comprising a radially extending blade portion, wherein the blade portion is integral with the thickness direction of the centrifugal fan device blade on the radially inner side. comprising a first region and a second region which is divided into two in the thickness direction of the centrifugal fan device for the blade in the radially outward, the two tip portions which are divided in the second region, the centrifugal fan A centrifugal fan device blade characterized by extending in two different directions from any one of three directions of a rotation direction front side, an extension straight line of a first region, and a rotation direction rear side in a circumferential direction of the device blade. , A centrifugal fan device including the electronic device, and an electronic device including the centrifugal fan device.

The invention according to claim 1 is a blade for a centrifugal fan device comprising a blade portion extending in the radial direction, and the blade portion is integrated in the thickness direction of the centrifugal fan device blade on the radially inner side. When, with a second region which is divided into two in the thickness direction of the centrifugal fan device for the blade in the radially outward, the two tip portions which are divided in the second region, the centrifugal fan device for the blade A centrifugal fan device blade characterized by extending in two different directions among any one of the three directions of the rotation direction front side, the extended straight line of the first region, and the rotation direction rear side , By dividing the tip of the blade part from the middle and extending it in different directions in the radial direction of the blade part, the inhaled air is divided to cause noise generated at the tip of the blade part. Thereby reducing the swirl of air. Furthermore, the location where the vortex is generated can be separated, recombination of the divided vortex can be prevented, and the noise of the centrifugal fan device can be reduced. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible. In the invention according to claim 2, the plurality of tip portions of the blade portion extend with curves in different directions, and the centers of the respective curves are located before and after the rotation direction with respect to the blade. The centrifugal fan device blade according to claim 1, wherein a plurality of tip portions of the blade portion are provided.
Since they have curvatures opposite to each other, it is possible to separate the location where the air vortex is generated and the location where it blows out, prevent recombination of the divided vortices, and reduce the noise of the centrifugal fan device. Furthermore, the outside air is smoothly blown out from the blade portion along the curved surface, and the air blowing efficiency of the blade can be improved. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible.

The invention according to claim 3 includes a drive unit, a hub unit that houses the drive unit, a blade having a blade unit that extends around the hub unit, and a frame that supports the blade and includes an intake port. The blade portion includes a first region that is integral in the thickness direction of the blade on the radially inner side, and a second region that is divided into two in the thickness direction of the blade on the radially outer side, and the second region the two tip portions which are divided in the, in the circumferential direction of the blade, the rotation direction front side, extending straight in the first region, after the rotation direction, of any three directions, that extend in two different directions A centrifugal fan device characterized by dividing the inhaled air by dividing the tip of the blade part from the middle and extending it in different directions in the radial direction of the blade, and generating noise at the tip of the blade Cause it is possible to reduce the swirl of air becomes, can release the occurrence location of the vortex to prevent recombination of the divided vortex, thereby reducing the noise of the centrifugal fan device. Further, the air pushed out from the blade can be dispersed, and the blown-out air can be sent out over a wide range, so that cooling over a wide range is possible.

The invention according to claim 4 is characterized in that the plurality of tip portions of the blade portion extend with curves in different directions, and the centers of the respective curves are located before and after the rotation direction with respect to the blade portion . The centrifugal fan device according to claim 3 , wherein the plurality of tip portions of the blade portion have curvatures opposite to each other, so that the location where the air vortex is generated and the location where the air is blown can be separated and divided. Vortex recombination can be prevented and the noise of the centrifugal fan device can be reduced. Furthermore, after the outside air is sucked into the centrifugal fan device, it is smoothly blown out from the blade portion along the curved surface, so that the air blowing efficiency of the blade can be improved. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible.

The invention according to claim 5, the boundary between the first region and the second region, any of claim 3 or 4, characterized in that there is outside the outer diameter of the intake port provided in the frame The centrifugal fan device according to any one of the above, wherein a portion where the blade portion is divided and the surface of the intake port do not overlap so that a large amount of outside air is sucked from the intake port at the non-divided portion of the blade portion. Can be used as air for cooling the blowout.

The invention according to claim 6 is an electronic apparatus comprising the centrifugal fan device according to any one of claims 3 to 5 , wherein the blade portion is divided in the axial direction of the blade, By providing the electronic device with the centrifugal fan device that extends in different directions in the radial direction of the fan, noise caused by the centrifugal fan device in the electronic device can be reduced.

In order to achieve the above object, the present invention is a centrifugal fan device blade comprising a radially extending blade portion, wherein the blade portion is integral with the thickness direction of the centrifugal fan device blade on the radially inner side. 1 region and a second region divided into two in the thickness direction of the blade for the centrifugal fan device on the outer side in the radial direction, and the two tip portions divided in the second region are the centrifugal fan device in the circumferential direction of the use blades, in different directions extending with a curve, the centers of curves centrifugal fan device for blades, characterized in that positioned before and after the rotation directions with respect to the blade portion, including the same with each other And an electronic device including the centrifugal fan device.

The invention according to claim 1 is a blade for a centrifugal fan device comprising a blade portion extending in the radial direction, and the blade portion is integrated in the thickness direction of the centrifugal fan device blade on the radially inner side. When, with a second region which is divided into two in the thickness direction of the centrifugal fan device for the blade in the radially outward, and two tips that are divided in the second region, the centrifugal fan device for the blade In the circumferential direction, the centrifugal fan blades are characterized by extending in different directions in the circumferential direction, and the centers of the respective curves are located in front of and behind the rotation direction with respect to the blade portion. By dividing the tip from the middle and extending it in different directions in the radial direction of the blade part, the inhaled air is divided to reduce the noise generated at the tip of the blade part. Thereby reducing the swirl of air becomes cause. Furthermore, the location where the vortex is generated can be separated, recombination of the divided vortex can be prevented, and the noise of the centrifugal fan device can be reduced. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible. Further, it is possible to release the occurrence location and balloon portion of vortex air to prevent recombination of vortices that its division, it is possible to reduce the noise of the centrifugal fan device. Furthermore, the outside air is smoothly blown out from the blade portion along the curved surface, and the air blowing efficiency of the blade can be improved. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible.

The invention according to claim 2 includes a drive unit, a hub unit that houses the drive unit, a blade that has a blade unit that extends around the hub unit, and a frame that supports the blade and includes an intake port. The blade portion includes a first region that is integral in the thickness direction of the blade on the radially inner side, and a second region that is divided into two in the thickness direction of the blade on the radially outer side, and the second region In the circumferential direction of the blade, the two tip portions divided in (1) extend with curves in mutually different directions, and the centers of the respective curves are located before and after the rotation direction with respect to the blade portion. Centrifugal fan device that divides the tip of the blade part in the middle and extends in different directions in the radial direction of the blade to divide the inhaled air and generate it at the tip of the blade It is possible to reduce the vortex of the air that causes the noise to be generated, to separate the vortex generation site, to prevent recombination of the divided vortices, and to reduce the noise of the centrifugal fan device . Further, the air pushed out from the blade can be dispersed, and the blown-out air can be sent out over a wide range, so that cooling over a wide range is possible.

Also, because it has a plurality of tip opposite curvature to each other of the blade portion, it is possible to release the occurrence location and balloon portion of the vortex air, preventing recombination of vortices that its division, the centrifugal fan device Noise can be reduced. Furthermore, after the outside air is sucked into the centrifugal fan device, it is smoothly blown out from the blade portion along the curved surface, so that the air blowing efficiency of the blade can be improved. Moreover, the air pushed out from the blade part can be dispersed, the blown-out air can be sent out over a wide range, and a wide range of cooling becomes possible.

The invention according to claim 3, the boundary between the first region and the second region, the centrifugal fan of claim 2, wherein the outside than the outer diameter of the intake port provided in the frame By not overlapping the part where the blade part is divided and the surface of the intake port, a large amount of outside air can be sucked from the intake port at the part where the blade part is not divided. It can be utilized as air for blowout cooling.

According to a fourth aspect of the present invention, there is provided an electronic apparatus comprising the centrifugal fan device according to any one of the second or third aspects, wherein the blade portion is divided in the axial direction of the blade, By providing the electronic device with the centrifugal fan device that extends in different directions in the radial direction of the fan, noise caused by the centrifugal fan device in the electronic device can be reduced.

Claims (5)

A blade for a centrifugal fan device including a blade portion extending in a radial direction,
The blade portion includes a first region that is integral in the thickness direction of the centrifugal fan device blade on the radially inner side, and a second region that is divided into a plurality in the thickness direction of the centrifugal fan device blade on the radially outer side. An area, and
The plurality of tip portions divided in the second region extend in different directions in the circumferential direction of the centrifugal fan device blade. A drive unit;
A hub portion for housing the driving portion;
A blade having a blade portion extending around the hub portion;
A frame that supports the blade and includes an air inlet;
The blade portion includes a first region that is integral in the thickness direction of the blade on the radially inner side, and a second region that is divided into a plurality in the thickness direction of the blade on the radially outer side,
The centrifugal fan device according to claim 1, wherein the plurality of tip portions divided in the second region extend in different directions in the circumferential direction of the blade. The plurality of tip portions of the blade portion extend with curves in different directions, and the centers of the curves are located before and after the rotation direction of the blade, respectively. Centrifugal fan device. The centrifugal fan device according to claim 2, wherein a boundary between the first region and the second region is outside an outer diameter of an air inlet provided in the frame. An electronic apparatus comprising the centrifugal fan device according to claim 2.