JP4793325B2 - Centrifugal fan device and electronic device including the same - Google Patents

Description

  The present invention is 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 casing of an electronic device, and heat transfer from a heat receiving body to a heat radiating body. The present invention relates to a centrifugal fan device that forcibly radiates heat from a radiator after efficiently performing such a method as a pipe or liquid refrigerant circulation, and an electronic device including the centrifugal fan device.

  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 contacting with a heat generating member such as a heat sink having heat dissipating fins, but also the method of directly cooling the heat sink with a fan, A heat sink module that is thermally connected to each other with a heat pipe is used to forcibly cool the radiator with air blown by a fan. It is indispensable to forcibly blow and dissipate heat from the radiator that has been transported to and from the heat radiating unit using a centrifugal fan device. is needed.

  On the other hand, the improvement of the cooling performance of the centrifugal fan device greatly depends on the improvement of the air blowing performance such as high air volume and high static pressure, and in addition, by blowing evenly over a wide range at the air outlet, for example, Since heat exchange is efficiently performed with the heat dissipating fins installed at the air outlet, it is possible to greatly improve.

  FIG. 10A is a side view showing the inside of a casing of a centrifugal fan device according to the prior art, and FIG. 10B is a front view of a portion of the casing of the centrifugal fan device according to the prior art.

  Here, the centrifugal fan device 101 is provided with a sirocco fan 103 inside a spiral casing 102, a motor 104 for rotating the sirocco fan 103 is provided on one surface of the casing 102, and the opposite surface thereof. Is provided with an air inlet 105.

  The spiral casing 102 includes side walls 121 and 122 and an outer peripheral wall 123 arranged in parallel, and forms a ventilation path 106 of the wind generated by the rotation of the sirocco fan 103 inside the casing 102. A discharge port 107 is opened at the end.

  The centrifugal fan device 101 is formed so that the outer peripheral wall 123a of the casing 102 following the casing nose portion 109 parallel to the rotation shaft 108 of the sirocco fan 103 spreads toward the discharge port 107, and accordingly the ends of both side walls. Enlarged portions 121a and 122a are provided with a discharge port portion 107a that opens widely at the end of the casing 102, and further, the nose position angle (A) is changed downward from the conventional position to move the casing nose portion 109 to increase the opening area. A wider discharge port 107 having a straight portion 110 at the tip is opened.

  A partition plate 111 is provided between the side walls 121 and 122 of the casing 102 from the ventilation path 106 to the wide discharge port 107.

The centrifugal fan device 101 rotates the sirocco fan 103 by driving the motor 104, turns the air sucked from the air suction port 105 into a spiral wind, and passes it through the ventilation path 106.
Wind is blown out from a wide outlet 107 opening at the end of the casing 102.

  Since the partition plate 111 of the centrifugal fan device 101 is arranged so as to divide the wind sent from the ventilation path 106 almost equally, the wind flows in the nose side ventilation path 112 and the anti-nose side ventilation path. The air is diverted almost equally to 113 and guided so as to expand as it approaches the wide outlet 107, and can be blown out almost uniformly from the entire outlet of the wide outlet 107.

  In the centrifugal fan device 101, the air passage of the greatly expanded discharge port portion is divided equally into the nose side and the anti-nose side to guide the wind, and the air is blown out evenly from the wide discharge port 107 as a whole. It is possible to prevent a decrease in the blowing performance as in the prior art that does not include the partition plate 111.

  Therefore, the centrifugal fan device 101 is effective for blowing and cooling a wide range, for example, for cooling a battery of an electric vehicle loaded with a large amount of battery such as a hybrid car.

  In addition, by providing the partition plate 111 at a position different from the above or by changing the inclination angle, the direction and the amount of air blown from the wide outlet 107 can be changed (Patent Document 1). ).

In another conventional technique, although not shown, there is a blower using a cross flow fan, and by providing one or a plurality of air passage partitions that divide the air passage in the air passage near the air outlet. There has also been proposed a method in which the air flow is stabilized in the ventilation path, and further, the occurrence of airflow separation is suppressed and noise caused by the separation sound can be reduced (Patent Document 2).
JP 2003-336600 A (FIGS. 1 and 2 on page 5) JP 2004-278473 A (FIGS. 1 and 3 on page 8)

  However, in the centrifugal fan device 101 according to the conventional technology as described above, the partition plate 111 has a simple plate shape and the partition plate 111 is formed over the entire height of the ventilation path 106. Of the air that is divided into approximately equal amounts into the passages 112 and 113, the air that is particularly divided into the ventilation passage 113 side has a problem that it is difficult to smoothly flow to the wide discharge port 107.

  In other words, the air flow direction is such that the air blown by the sirocco fan 103 constantly collides with the surface of the partition plate 111 facing the sirocco fan 103 so as to forcibly spread to the ventilation passage 112 on the nose side. It has been changed.

  However, in the vicinity of the surface of the partition plate 111 located on the opposite side of the surface facing the sirocco fan 103, air hardly flows, and the speed of the air in the vicinity thereof is greatly reduced. A pressure difference with the air flowing in the vicinity of the outer peripheral wall 123 is also likely to occur.

  Accordingly, the partition plate 111 acts as a large air path resistance as a whole, and also causes vortex and turbulence to be generated on the opposite side of the surface facing the sirocco fan 103. Although it is possible to blow out air evenly from the discharge port 107 as compared with the conventional case, it is difficult to increase the entire blowing amount by partially not smoothly flowing air as described above. was there.

  Further, in the blower using the cross flow fan in the conventional technology as described above, although the stability of the air flow can be improved and noise can be reduced, it is difficult to blow out uniformly over a wide range at the air outlet. There was a problem that there was.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a centrifugal fan device capable of realizing uniform air blowing and air volume increase over a wide range at an air outlet.

In order to solve the above-described conventional problems, a centrifugal fan that blows air in a centrifugal direction by rotation of a blade, and a side wall having an air outlet that houses the centrifugal fan and blows air to the side of the outer periphery of the centrifugal fan A casing comprising a parallel member having an air inlet for covering the blade and sucking air; and a wall standing on the inner surface of the parallel member of the casing and extending from the side wall to the air outlet and lower than the side wall surface of the side wall A side surface on the blade side of the flow dividing member is substantially perpendicular to the inner surface, and a side surface on the side wall side of the flow dividing member is inclined with respect to the inner surface .

  With this configuration, since the deviation of the air volume of the air blown from the air outlet can be reduced, it is possible to achieve uniform air blowing and an increase in the air volume over a wide range.

  In addition, the centrifugal fan device having the radiating fin according to the present invention includes a centrifugal fan that blows air in a centrifugal direction by rotation of a blade, and an air blower that houses the centrifugal fan and blows air to the outer side of the centrifugal fan. A casing having a side wall having an outlet and a parallel member having an air suction port that covers the blade and sucks air, and is provided on the inner surface of the parallel member of the casing and extends from the side wall to the air outlet and extends to the side of the side wall. And a diversion member lower than the height of the wall surface.

  This configuration can reduce the deviation in the air volume of the air blown from the air outlet, so that the effect of blowing air uniformly and increasing the air volume over a wide range is obtained, heat exchange with the radiating fins is performed efficiently, and cooling is performed. Improve performance.

  In addition, since it is possible to suppress the generation of abnormal noise such as wind noise when the gap between the radiating fins is ventilated due to the biased air flow with respect to the radiating fin, it is possible to further improve the quietness.

  Furthermore, the electronic device of the present invention includes the centrifugal fan device of the present invention.

  This configuration improves the heat dissipation performance for heat sinks such as heat dissipating fins and facilitates heat generation countermeasures when heat generating electronic components such as MPUs and CPUs driven at higher clock frequencies are mounted. As a result, the cooling performance of the electronic device can be improved and the performance of the electronic equipment can be improved.

  According to the centrifugal fan device of the present invention, since the deviation of the air volume of the air blown out from the air outlet can be reduced, it is possible to realize uniform air blowing and increase in the air volume over a wide range.

  According to invention of Claim 1, the centrifugal fan which blows air to a centrifugal direction by rotation of a braid | blade, the side wall which has an air blower which accommodates a centrifugal fan and blows off air to the side of the outer peripheral side of a centrifugal fan, A casing comprising a parallel member having an air inlet for covering the blade and sucking air; and a wall standing on the inner surface of the parallel member of the casing and extending from the side wall to the air outlet and lower than the side wall surface of the side wall By having the flow dividing member, it is possible to reduce the deviation of the air volume of the air blown from the air outlet, so that it is possible to achieve uniform air blowing and increase in the air volume over a wide range.

Further, the blade side surface of the flow dividing member is substantially perpendicular to the inner surface, and the side wall side surface of the flow dividing member is inclined with respect to the inner surface. Flow generation is suppressed, and air flows smoothly along the inclined surface, so that the deviation of the air volume blown from the air outlet is more reliably reduced, and evenly more air is blown out and the air volume is increased more widely. Can be realized.

According to the second aspect of the present invention, since the end surface on the air outlet side of the flow dividing member is inclined with respect to the inner surface, the rotation of the centrifugal fan is performed while the air flowing along the inner wall surface is divided by the flow dividing member. The air diverted in two directions, the direction perpendicular to the central axis and the direction of the central axis of rotation of the centrifugal fan, is mixed as it approaches the air outlet along the inclined surface, and the amount of air blown out from the air outlet is air. In the region of the air outlet, it is possible to equalize, and as a result, the deviation of the air volume of the air blown out from the air outlet can be further reliably reduced, and the air can be uniformly blown out and the air volume can be increased over a wide range.

According to invention of Claim 3, the centrifugal fan which blows air to a centrifugal direction by rotation of a braid | blade, the side wall which has an air blower which accommodates a centrifugal fan and blows off air to the side of the outer peripheral side of a centrifugal fan, A casing comprising a parallel member having an air suction port for covering the blade and sucking air; and a shunt member standing on the inner surface of the parallel member of the casing and lower than the height of the side wall surface of the side wall. The member can diminish the deviation of the air volume of the air blown out from the air outlet by diverting the air passing through the air outlet in two directions, the direction orthogonal to the rotation center axis of the centrifugal fan and the direction of the rotation center axis of the centrifugal fan. Therefore, it is possible to realize uniform air blowing and increase in air volume over a wide range.

According to the invention of claim 4 , by providing the centrifugal fan device according to any one of claims 1 to 3 , the heat radiation performance for the heat radiating body such as a heat radiating fin is improved, and it is driven at a higher clock frequency. Since heat generation countermeasures when heat generating electronic components such as MPUs and CPUs are mounted are facilitated, the cooling performance of the heat generating electronic components can be improved, and high performance of the electronic equipment can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the fan frame side of the casing will be described as the lower side, and the fan cover side will be described as the upper side.

(Embodiment 1)
FIG. 1 is a perspective view of a centrifugal fan device according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the centrifugal fan device according to Embodiment 1 of the present invention with the fan cover removed, and FIG. ) Is a plan view of the centrifugal fan device according to Embodiment 1 of the present invention with the fan cover removed, FIG. 3B is a cross-sectional view taken along the line AA of FIG. FIG. 5A is a partially enlarged perspective view of the centrifugal fan device according to the first embodiment of the present invention, and FIG. 5A is a partially enlarged perspective view showing the air flow in the vicinity of the flow dividing member according to the first embodiment of the present invention. (B) is a schematic diagram showing the air flow of FIG.

  First, as shown in FIG. 1, the thin and flat casing 2 of the centrifugal fan device 1 is composed of a fan cover 2a located at the upper part and a fan frame 2b located at the lower part thereof.

  Here, the fan cover 2a is formed into a plate shape by punching or resin molding of a metal material such as aluminum or stainless steel, and a substantially circular air suction port 3a for sucking air from the outside at a substantially central portion thereof. Is arranged.

  A centrifugal fan 4 is disposed inside the casing 2 so as to be sandwiched and accommodated between the fan cover 2a and the fan frame 2b. The centrifugal fan 4 includes a hub portion 4a having a cylindrical outer peripheral surface and an outer periphery thereof. A plurality of blades 4b extending substantially radially from the surface in the centrifugal direction, and the blades 4b rotate about a rotation center axis 4c (see FIG. 3A), which is a rotation center. The air sucked from 3a is blown in the centrifugal direction.

  The fan frame 2b is integrally formed with a bottom and a side wall by resin molding or die casting of an aluminum alloy, and an air outlet 5 is provided on the side wall to blow out the air sucked into the casing 2. ing.

  That is, the casing 2 includes a side wall having an air outlet 5 that blows air to the side of the outer peripheral side of the centrifugal fan 4, and a fan cover 2a that is two parallel members and a bottom portion of the fan frame 2b. ing.

  Next, as shown in FIG. 2, a substantially cylindrical shape is inserted into the mounting hole of the fan cover 2a (see FIG. 1) and fixed by heat welding or caulking on the upper part of the side wall of the fan frame 2b. Convex portions 6 are provided at four locations.

  In addition, the air suction port 3b having substantially the same diameter as that of the air suction port 3a (see FIG. 1) described above is also provided at the bottom located below the fan frame 2b, and sucks in air from the outside.

  And the spoke 7 which hold | maintains the centrifugal fan 4 rotatably so that the air suction inlet 3b may be crossed is provided in the peripheral part of the air suction inlet 3b of the fan flame | frame 2b.

  Here, when the centrifugal fan 4 rotates at a high speed in the rotation direction indicated by the arrow R, an air suction port disposed at the center of the fan cover 2a (see FIG. 1) so as to face the upper surface of the hub portion 4a. Air is sucked from both 3a and the air inlet 3b disposed in the center of the bottom of the fan frame 2b.

  Further, since the sucked air is changed in the direction of the wind in the centrifugal direction of the blade 4b inside the casing 2 by the rotational movement of the plurality of blades 4b, most of the air hits the inner walls of the fan cover 2a and the fan frame 2b. However, the air is sent along the inner wall in the rotational direction indicated by the arrow R of the centrifugal fan 4 and finally blown out from the air outlet 5.

  Further, in the ventilation path 9 between the side wall surface 8 of the fan frame 2b located on the outer peripheral side of the centrifugal fan 4 and the air outlet 5, a flow dividing member 10 is integrated with the inner surface of the bottom of the fan frame 2b. Is formed. The flow dividing member 10 may be provided as a separate member from the bottom of the fan frame 2b.

  The diversion member 10 extends from the side wall surface 8 of the side wall of the casing 2 to the air outlet 5, and the height thereof is lower than the height of the side wall surface 8 of the side wall of the casing 2.

  Therefore, the direction of the air passing through the air outlet 5 by the side wall surface 8 and the flow dividing member 10 is perpendicular to the rotation center axis 4c (see FIG. 4) of the centrifugal fan 4 and the direction of the rotation center axis 4c (see FIG. 4) of the centrifugal fan 4. Therefore, it is possible to reduce the deviation of the air volume of the air blown out from the air outlet 5 and to realize uniform air blowing and increase in the air volume over a wide range.

  That is, the air passing through the air outlet 5 passes through the air flowing along the flow dividing member 10 in the direction of the air outlet 5 and the gap above the flow dividing member 10 and passes along the side wall surface 8. Since the air is diverted into the air flowing in the direction, it is possible to reduce the deviation of the air volume of the air blown out from the air outlet 5 and to realize uniform air blowing and increase in the air volume over a wide range.

  As shown in FIG. 3A, the upper portion of the curved side wall of the fan frame 2b is inserted into the mounting hole of the fan cover 2a (see FIG. 1) and fixed by heat welding or caulking. The substantially cylindrical convex portions 6 are provided at four locations.

  In addition, the air suction port 3b having substantially the same diameter as that of the air suction port 3a (see FIG. 1) described above is also provided at the bottom located below the fan frame 2b, and sucks in air from the outside.

  And the spoke 7 which hold | maintains the centrifugal fan 4 rotatably so that the air inlet 3b may be crossed is provided in three places by the peripheral part of the air inlet 3b of the fan flame | frame 2b.

  Here, when the centrifugal fan 4 rotates at a high speed in the rotation direction indicated by the arrow R, an air suction port disposed at the center of the fan cover 2a (see FIG. 1) so as to face the upper surface of the hub portion 4a. 3a and the air suction port 3b disposed at the center of the bottom of the fan frame 2b, air is sucked into the casing 2 by the rotational movement of the blades 4b. Since the wind direction is changed to the centrifugal direction of the blade 4b, most of the air collides with the inner wall of the fan cover 2a or the fan frame 2b, and the air in the rotational direction indicated by the arrow R of the centrifugal fan 4 along the inner wall. Is divided into the direction indicated by the solid line arrow and the direction indicated by the broken line arrow by the flow dividing member 10 described above, and finally blown out from the air outlet 5.

  Further, in the ventilation path 9 between the side wall surface 8 of the fan frame 2 b located on the outer peripheral side of the centrifugal fan 4 and the air outlet 5, the flow dividing member 10 is in the direction of the rotation center axis 4 c of the centrifugal fan 4. It is erected on the inner surface of the bottom portion of the fan frame 2b (corresponding to the vertical direction in FIG. 3B).

  As shown in FIG. 3B, the height Hb of the flow dividing member 10 from the inner surface of the fan frame 2b is about 50% to 80% of the height Hf of the side wall surface 8 from the inner surface of the fan frame 2b. The air passing through the air outlet 5 by the side wall surface 8 and the flow dividing member 10 is orthogonal to the direction of the rotation center axis 4c of the centrifugal fan 4 and the direction of the rotation center axis 4c of the centrifugal fan 4 Since the air is diverted in two directions, the deviation of the air volume of the air blown out from the air outlet 5 can be reduced, and the uniform air blowing and the increase in the air volume can be realized over a wide range.

  That is, the air passing through the air outlet 5 passes along the side wall surface 8 through the air flowing in the direction of the air outlet 5 along the flow dividing member 10 and the gap (Hf−Hb) above the flow dividing member 10. Since the air is diverted to the air flowing in the direction of the air outlet 5, it is possible to reduce the deviation of the air volume of the air blown out from the air outlet 5, and to realize uniform air blowing and increase in the air volume over a wide range.

  Here, the first side surface 10a, which is the surface of the flow dividing member 10 on the blade 4b side, is formed substantially perpendicular to the fan frame 2b so that the angle θa is in the range of 75 ° to 105 °. The air blown from the fan 4 is directly received and smoothly flows to the air outlet 5 along this surface.

  Further, the second side surface 10b, which is the surface on the side wall surface 8 side of the flow dividing member 10, is inclined with respect to the fan frame 2b so that the angle θb is in the range of 25 ° to 65 °. The air that has passed through the upper gap (Hf−Hb) smoothly flows to the air outlet 5 in the direction of the air outlet 5 along the inclined surface of the second side face 10b.

  4 will be described in detail. In the ventilation path 9 between the side wall surface 8 of the fan frame 2b located on the outer peripheral side of the centrifugal fan 4 and the air outlet 5, there is a flow dividing member 10; Is erected on the inner surface of the bottom portion of the fan frame 2b in the direction of the rotation center axis 4c of the centrifugal fan 4 (corresponding to the vertical direction in FIG. 3B).

  Further, the flow dividing member 10 is provided with a first side surface 10a that directly receives the air blown from the centrifugal fan 4 so as to rise substantially vertically from the upper surface of the fan frame 2b within the range of the angle θa described above. Hb is set to a height within a range of about 50% to 80% lower than the height Hf of the side wall surface 8 of the fan frame 2b.

  As described above, the height Hb of the flow dividing member 10 is made lower than the height Hf of the side wall surface 8 of the fan frame 2 b of the casing 2, and the air passing through the air outlet 5 using the flow dividing member 10 and the side wall surface 8 is discharged. A direction perpendicular to the rotation center axis 4c of the centrifugal fan 4 (corresponding to a direction parallel to the bottom of the fan frame 2b in FIG. 3B) and a direction of the rotation axis 4c of the centrifugal fan 4 (vertical direction in FIG. 3B) Are divided in two directions.

  That is, the air passing through the air outlet 5 collides with the first side surface 10 a of the flow dividing member 10 and flows in the direction of the air outlet 5 along the first side surface 10 a and the gap above the flow dividing member 10. It is divided into air that passes through (Hf−Hb) and flows along the side wall surface 8.

  Therefore, since the deviation of the air volume of the air blown out from the air outlet 5 can be reduced, it is possible to realize uniform air blowing and increase in the air volume over a wide range.

  Further, the second side surface 10b, which is an inclined surface on the side wall surface 8 side of the flow dividing member 10, allows the air to escape to the air outlet 5 to pass upward when passing through the side of the flow dividing member 10. As a result, the airflow resistance by the flow dividing member 10 is reduced, the generation of vortex and turbulent flow is suppressed, and the air that has flowed upward along the inclined surface of the second side surface 10b flows smoothly. Thus, the deviation of the air volume of the air blown from the air can be further reliably reduced, and the air can be blown out more uniformly and the air volume can be increased over a wide range.

  Further, a third side surface 10c is provided on the end surface of the flow dividing member 10 on the side of the air outlet 5 which becomes wider toward the air outlet 5 and is inclined with respect to the inner surface of the bottom of the fan frame 2b. As a result, the air passing through the air outlet 5 is diverted by the diverter 10 and the side wall surface 8 and is parallel to the bottom of the fan frame 2b in the direction perpendicular to the rotation center axis 4c of the centrifugal fan 4 (FIG. 3B). In the direction of the central axis 4c of the centrifugal fan 4 (corresponding to the vertical direction in FIG. 3 (b)) and the air diverted along the inclined surface of the third side surface 10c. The closer to the outlet 5, the more they are mixed, and the air volume of the air blown out from the air outlet 5 can be equalized in the region of the air outlet 5. As a result, the deviation of the air volume of the air blown out from the air outlet 5 can be reduced. Than Layer reliably reduced, it can be realized an increase in the blowing and air volume equivalent air Extensive.

  That is, the air passing through the air outlet 5 passes through the air flowing along the flow dividing member 10 in the direction of the air outlet 5 and the gap above the flow dividing member 10 and passes along the side wall surface 8. Since the air is diverted into the air flowing in the direction, it is possible to reduce the deviation of the air volume of the air blown out from the air outlet 5 and to realize uniform air blowing and increase in the air volume over a wide range.

  As described above, by extending the flow dividing member 10 from the side wall surface 8 in the vicinity of the air outlet 5 to the air outlet 5, the air outlet starts to divert before the air passing through the air outlet 5 starts to diffuse. Since the air is continuously divided until it passes through the air outlet 5 and is surely divided when passing through the air outlet 5, the air volume of the air blown out from the air outlet 5 is reliably biased. It is possible to reduce air flow and increase air volume more evenly over a wide area.

  Next, with reference to FIGS. 5A and 5B, the air diversion state by the diversion member 10 will be described in more detail.

  Here, in FIG. 5 (a), the air flowing toward the center of the air outlet 5 along the first side surface 10a while colliding with the first side surface 10a of the flow dividing member 10 is indicated by a broken line arrow. The air flowing along the side wall surface 8 through the gap above the member 10 is indicated by a solid arrow.

  Further, in order to clearly represent the diversion state, in FIG. 5 (b), a three-dimensional schematic diagram is used, and an air flow and a solid arrow indicated by broken arrows corresponding to FIG. 5 (a) are used. It shows a state of being diverted to the indicated air.

  As is clear from this figure, the air that flows into the air outlet 5 using the flow dividing member 10 and the side wall surface 8 is allowed to flow in the direction (XY plane direction) perpendicular to the rotation center axis 4 c of the centrifugal fan 4. The air is split along the first side surface 10 a into the air that flows toward the center of the air outlet 5 and the air that flows along the side wall surface 8.

  At the same time, the flow dividing member 10 causes the air flowing through the air outlet 5 to flow along the first side surface 10a of the flow dividing member 10 in the rotation center axis direction (Z direction) of the centrifugal fan 4 and the flow dividing member 10. The air is diverted to the air flowing along the side wall surface 8 through the upper gap.

  That is, the air passing through the air outlet 5 passes through the air flowing along the flow dividing member 10 in the direction of the air outlet 5 and the gap above the flow dividing member 10 and passes along the side wall surface 8. Since the air is diverted into the air flowing in the direction, it is possible to reduce the deviation of the air volume of the air blown out from the air outlet 5 and to realize uniform air blowing and increase in the air volume over a wide range.

  As described above, the air is blown from the air outlet 5 by diverting in two directions, the direction orthogonal to the rotation center axis 4c of the centrifugal fan 4 (XY plane direction) and the rotation center axis direction of the centrifugal fan 4 (Z direction). Since the deviation of the air volume of the air to be discharged can be reduced, it is possible to achieve uniform air blowing and increase in the air volume over a wide range.

  Further, the second side surface 10b, which is an inclined surface on the side wall surface 8 side of the flow dividing member 10, allows the air to escape to the air outlet 5 to pass upward when passing through the side of the flow dividing member 10. As a result, the airflow resistance by the flow dividing member 10 is reduced, the generation of vortex and turbulent flow is suppressed, and the air that has flowed upward along the inclined surface of the second side surface 10b flows smoothly. Thus, the deviation of the air volume of the air blown from the air can be further reliably reduced, and the air can be blown out more uniformly and the air volume can be increased over a wide range.

  Further, a third side surface 10c is provided on the end surface of the flow dividing member 10 on the side of the air outlet 5 which becomes wider toward the air outlet 5 and is inclined with respect to the inner surface of the bottom of the fan frame 2b. As a result, the air passing through the air outlet 5 is diverted by the diverter 10 and the side wall surface 8, and in two directions, the direction orthogonal to the rotation center axis 4 c of the centrifugal fan 4 and the direction of the rotation center axis 4 c of the centrifugal fan 4. The diverged air is mixed so as to approach the air outlet 5 along the inclined surface of the third side face 10c, and the air volume blown from the air outlet 5 is made uniform in the region of the air outlet 5. As a result, the deviation of the air volume of the air blown out from the air outlet 5 can be further reliably reduced, and the air can be blown out more uniformly and the air volume can be increased more widely.

  That is, the air passing through the air outlet 5 passes through the air flowing along the flow dividing member 10 in the direction of the air outlet 5 and the gap above the flow dividing member 10 and passes along the side wall surface 8. Since the air is diverted into the air flowing in the direction, it is possible to reduce the deviation of the air volume of the air blown out from the air outlet 5 and to realize uniform air blowing and increase in the air volume over a wide range.

  As described above, by extending the flow dividing member 10 from the side wall surface 8 in the vicinity of the air outlet 5 to the air outlet 5, the air outlet starts to divert before the air passing through the air outlet 5 starts to diffuse. Since the air is continuously divided until it passes through the air outlet 5 and is surely divided when passing through the air outlet 5, the air volume of the air blown out from the air outlet 5 is reliably biased. It is possible to reduce air flow and increase air volume more evenly over a wide area.

(Embodiment 2)
6A is a perspective view of the centrifugal fan device according to Embodiment 2 of the present invention, FIG. 6B is a perspective view of the centrifugal fan device of FIG. 6A inverted, and FIG. 7 is the present invention. FIG. 8A is a plan view of the centrifugal fan device according to Embodiment 2 with the fan cover removed, and FIG. 8A is a perspective view of the centrifugal fan device with a wind speed distribution measurement plate mounted thereon, FIG. b) is a graph of the wind speed distribution showing the diversion effect of the diversion member.

  First, as shown in FIGS. 6A and 6B, the centrifugal fan device 21 has a thin and flat shape composed of a fan cover 22a located at the upper part and a fan frame 22b located at the lower part. Casing 22, a centrifugal fan 23 housed in casing 22, and a plurality of radiating fins 24 arranged continuously to one air outlet 32 (see FIG. 7) located on the side of casing 22. The plurality of radiating fins 25 arranged continuously to the other air outlet (not shown) located on the side of the casing 22 are connected to the upper ends of the radiating fins 24 and the radiating fins 25 to generate heat. A heat pipe 27 that receives heat of the electronic component (not shown) by the heat receiving portion 26 and transfers the heat to the heat radiating fins 24 and the heat radiating fins 25 is provided.

  The configuration of the centrifugal fan 23, the casing 22, and the flow dividing member 28 (see FIG. 7) provided in the casing 22 is the same as that of the centrifugal fan device 1 (see FIG. 1) described in the first embodiment. A part of the overlapping contents will be omitted.

  The fan cover 22a is formed into a plate shape by stamping or resin molding of a metal material such as aluminum or stainless steel, and a substantially circular air suction port 29a for sucking air from the outside is provided at a substantially central portion thereof. It is arranged.

  A centrifugal fan 23 is disposed inside the casing 22 so as to be sandwiched and accommodated between the fan cover 22a and the fan frame 22b. The centrifugal fan 23 includes a hub portion 23a having a cylindrical outer peripheral surface and an outer periphery thereof. A plurality of blades 23b extending substantially radially from the surface in the centrifugal direction, and the blades 23b rotate about a rotation center axis 23c (see FIG. 7), which is the rotation center axis, to bring air into the centrifugal direction. Blow.

  The fan frame 22b is integrally formed with a bottom portion and a side wall by resin molding, die casting of an aluminum alloy, or the like. An air outlet 32 (see FIG. 7) is provided.

  That is, the casing 22 includes a side wall having an air outlet 32 that blows air to the side of the outer peripheral side of the centrifugal fan 23, and a fan cover 22a that is two parallel members and a bottom portion of the fan frame 22b. ing.

  Also, on the upper part of the side wall of the fan frame 22b, there are provided four substantially cylindrical convex portions 22c that are fitted into the mounting holes of the fan cover 22a and fixed by heat welding or caulking.

  In addition, an air suction port 29b having substantially the same diameter as that of the air suction port 29a described above is also provided at the bottom located below the fan frame 22b, and sucks in air from the outside.

  And the spoke 30 which hold | maintains the centrifugal fan 23 rotatably is continuously provided in the peripheral part of the air suction inlet 29b of the fan flame | frame 22b so that the air suction inlet 29b may be crossed.

  Here, when the centrifugal fan 23 rotates at a high speed in the rotation direction indicated by the arrow R, the air suction port 29a and the fan frame 22b disposed in the central portion of the fan cover 22a so as to face the upper surface of the hub portion 23a. The air is sucked in from both the air suction port 29b disposed in the center of the bottom of the slab, and the sucked air is rotated in the casing 22 by the rotational motion of the plurality of blades 23b. Since most of the air hits the inner wall of the fan cover 22a and the fan frame 22b, the air is sent along the inner wall in the rotational direction indicated by the arrow R of the centrifugal fan 23, and finally the air direction is changed. Thus, the air is blown out from the air outlet 32 (see FIG. 7).

  And since the air which flowed along the inner wall of the casing 22 is air-fed in a wide range from the air outlet 32 (refer FIG. 7) toward each of the radiation fin 24 and the radiation fin 25, it is the heat receiving part 26. The heat received from the heat generating electronic component (not shown) by the heat is transferred to the heat radiating fins 24 and the heat radiating fins 25 through the heat pipe 27 described above, and the air and heat flowing through the gaps between the heat radiating fins. It is exchanged for efficient heat dissipation.

  Next, with reference to FIG. 7, the relationship between the air flow divided state by the flow dividing member 28 and the radiation fins 25 will be described in more detail.

  As is apparent from this figure, the flow dividing member 28 is located in the ventilation path 33 between the side wall surface 31 of the fan frame 22b located on the outer peripheral side of the centrifugal fan 23 and the air outlet 32, and the fan frame 22b. Are integrally formed on the inner surface of the bottom of the. The flow dividing member 10 may be provided as a separate member from the bottom of the fan frame 2b.

  The diversion member 28 extends from the side wall surface 31 of the side wall of the casing 22 to the air outlet 32, and the height thereof is lower than the height of the side wall surface 8 of the side wall of the casing 22.

  Here, the height from the inner surface of the bottom portion of the fan frame 22b of the flow dividing member 28 is set low so as to be about 50% to 80% from the inner surface of the bottom portion of the fan frame 22b of the side wall surface 31; Reference numeral 28 denotes a direction indicated by solid arrows in two directions, ie, a direction perpendicular to the rotation center axis 23c of the centrifugal fan 23 and a direction perpendicular to the rotation center axis 23c of the centrifugal fan 23. And the direction indicated by the broken-line arrow can greatly diminish the deviation of the air volume of the air blown from the air outlet 32, so that the effect of uniform air blowing and increasing the air volume can be obtained over a wide range. The heat exchange at the fins 25 is efficiently performed, and the cooling performance can be improved.

  Moreover, since the generation | occurrence | production of unusual noises, such as a wind noise, at the time of the ventilation of the clearance gap between the radiation fins 25 resulting from performing the biased ventilation with respect to the radiation fin 25 can also be suppressed, the improvement of silence can be implement | achieved more.

  Further, the second side surface 28b, which is the surface on the side wall surface 31 side of the flow dividing member 28, is inclined so that the angle is in the range of 25 ° to 65 ° with respect to the fan frame 22b. When the air passing through the side of the flow dividing member 28 passes above the air, the air flow resistance by the flow dividing member 28 is reduced, and the generation of vortex and turbulent flow is suppressed. Since air smoothly flows along the inclined surface of the side surface 28b, the deviation of the air volume of the air blown out from the air outlet 32 is more reliably reduced, and the effect of increasing the air volume and increasing the air volume more evenly over a wide range is obtained. Therefore, the heat exchange with the radiating fins 25 is efficiently performed, and the cooling performance can be improved.

  Furthermore, a third side surface 28c that is wider toward the air outlet 32 and inclined with respect to the inner surface of the bottom of the fan frame 2b is provided on the end surface of the flow dividing member 28 on the air outlet 32 side. Thus, the air that has flowed out to the air outlet 32 is diverted by the diverting member 28 and the side wall surface 31, and the air diverted in two directions orthogonal to the rotation center axis 4c of the centrifugal fan 4 is its third side face 28c. As the air blower 5 approaches the air blower outlet 5, the air volume of the air blown out from the air blower outlet 32 can be equalized in the region of the air blower outlet 32. The deviation of the air volume of the air to be blown out is further reliably reduced, and the effect of increasing the air volume and increasing the air volume is obtained over a wide range, and the heat exchange with the radiating fins 25 is performed efficiently, and the cooling performance is improved. Improvement of can be realized.

  In other words, the air that passes through the air outlet 32 passes through the air flowing along the flow dividing member 28 in the direction of the air outlet 32 and the gap above the flow dividing member 28 and passes along the side wall surface 31 of the air outlet 5. Since the air is diverted to the air flowing in the direction, the air volume of the air blown out from the air outlet 32 is less biased, and the effect of blowing the air uniformly and increasing the air volume is obtained over a wide range, so that heat exchange at the radiating fins 25 is achieved. Is efficiently performed, and cooling performance can be improved.

  As described above, by extending the diversion member 28 from the side wall surface 31 in the vicinity of the air outlet 32 to the air outlet 32, the air flowing through the air outlet 32 starts to be diverted before the air starts to diffuse and the air The air continues to be diverted until it passes through the outlet 32, and when it passes through the air outlet 32, the air is surely diverted. Even more reliably, the effect of blowing air uniformly and increasing the air volume over a wide range can be obtained, heat exchange with the radiating fins 25 can be performed efficiently, and cooling performance can be improved.

  Next, FIG. 8A shows a state in which the measurement plate 24p and the measurement plate 25p for the wind speed distribution are attached to the outlets of the radiating fins 24 and the radiating fins 25 of the centrifugal fan device 21, respectively.

  Here, the slit symbols are sequentially assigned to the respective slits 25p from the upstream side to the respective slits F1, F2, F3,..., F11, and further, the measurement plate 24p is assigned to the respective slits from the upstream side. Slit symbols S1, S2, S3,..., S10 are sequentially assigned so that the horizontal axis of a graph of wind speed distribution described later can be associated with each other.

  FIG. 8B is a wind speed distribution graph showing the result of measuring the wind speed for each slit in a state where the wind speed distribution measurement plates 24p and 25p as shown in FIG. The flow-dividing effect of a flow-dividing member is shown.

  In this graph, the centrifugal fan 23, the casing 22, and the radiating fins 24, 25 are made the same as preconditions, the fan noise value is also adjusted to be the same with a value equivalent to 32 dBA, and without the flow dividing member 28 and Comparison with a simple plate-shaped flow dividing member was performed.

  As a result of the measurement, although there is no large difference in the wind speed distribution in the slit symbols S1, S2, S3,..., S10 located on the outlet side of the radiating fin 24, the slit symbol F1 located on the outlet side of the radiating fin 25. , F2, F3,..., F11 showed significant differences in the wind speed distribution.

  In particular, when there is no flow diverting member, air is locally biased to the slit symbol F2 when the simple diverting member is provided in the slit symbol F2, and between the heat dissipating fins 25 due to that. While abnormal noise such as wind noise is generated when the gap is ventilated and it is difficult to increase the rotational speed, when the flow dividing member 28 as in the second embodiment of the present invention is provided, a slit is provided. Since the current is diverted in the direction of the symbol F2 and the slit symbol F4, abnormal noise such as wind noise when the gap between the radiating fins 25 is vented is suppressed accordingly.

  When the comparison is made with the same fan noise value, the rotational speed can be further increased. Therefore, when the flow dividing member 28 is provided, the slit symbols F1, F2, and F3 are clearly shown in the graph. , ..., an increase in wind speed is observed throughout F11.

  Therefore, the air volume blown out from both the radiation fins 24 and the radiation fins 25 is confirmed to increase by about 14% compared to the case without the diversion member, and compared with the case where a simple plate-like diversion member is provided. An increase of about 18% was observed.

  From the above, the centrifugal fan device 21 as in the second embodiment of the present invention can reduce the deviation of the air volume of the air blown from the air outlet 32. Thus, the heat exchange at the radiating fins 25 is efficiently performed, and the cooling performance can be improved.

  Moreover, since the generation | occurrence | production of unusual noises, such as a wind noise, at the time of the ventilation of the clearance gap between the radiation fins 25 resulting from performing the biased ventilation with respect to the radiation fin 25 can also be suppressed, the improvement of silence can be implement | achieved more.

(Embodiment 3)
FIG. 9A is a view showing the inside of the housing of the electronic device according to Embodiment 3 of the present invention, and FIG. 9B is a cross-sectional view showing the main part of FIG.

  The electronic device 50 is a notebook PC having a configuration in which an openable liquid crystal display device 51 is rotatably supported by a hinge mechanism 53 at an end of a main body device 52 having an operation unit.

  In this figure, a heat generating electronic component (not shown) to be cooled is mounted on the lower surface of the circuit board 54 disposed inside the housing of the main device 52 of the electronic device 50. A plurality of radiating fins 55 that are thermally connected to each other are shown installed on the housing side surface 52 a side of the main body device 52.

  Further, the centrifugal fan device 56 is the same as that of the configuration described in the first embodiment, and is mounted below the circuit board 54 so as to be adjacent to the radiating fin 55 described above, and the fan cover 57 is disposed on the lower side. The fan frame 58 is oriented upward.

  The air on the lower side of the main body device 52 passes through the plurality of vent holes 59 provided on the housing bottom surface 52b side of the main body device 52 and is sucked from the air inlet 57a of the fan cover 57, and at the same time. The air inside 52 is sucked from the air suction port 58 a of the fan frame 58, and the centrifugal fan 60 moves in the centrifugal direction inside the casing constituted by the fan cover 57 and the fan frame 58 by the rotational movement of the centrifugal fan 60. Therefore, most of the air hits the inner walls of the fan cover 57 and the fan frame 58, and the air is sent along the inner walls in the same direction as the rotation direction of the centrifugal fan 60.

  As described in the first embodiment, the height of the flow dividing member 61 is lower than the height of the side wall surface 58b of the fan frame 58, and the flow dividing member 61 flows along the side wall surface 58b and flows into the air outlet 62. Is divided in two directions, the direction perpendicular to the rotation center axis 60a of the centrifugal fan 60 and the direction of the rotation center axis 60a of the centrifugal fan 60, thereby reducing the deviation in the air volume of the air blown from the air outlet 62. It is possible to achieve uniform air blowing and increased air volume.

  Therefore, the air blown from the air outlet 62 has an effect of blowing air uniformly and increasing the air volume over such a wide range, and heat exchange at the radiating fins 55 is efficiently performed, thereby improving the cooling performance. Can be realized.

  Moreover, since the generation | occurrence | production of unusual noises, such as a wind noise, at the time of the ventilation of the clearance gap between the radiation fins 55 resulting from performing the biased ventilation with respect to the radiation fin 55 can also be suppressed, the improvement in silence can be implement | achieved more.

  The air that has passed through the gaps between the plurality of radiating fins 55 while exchanging heat with the radiating fins 55 finally passes through the vent hole 63 provided in the casing side surface 52a of the main body device 52 and is discharged to the outside. Is done.

  That is, when the centrifugal fan device 56 as described above is provided, the heat dissipation performance for the heat radiating body such as the heat radiating fins 55 is improved, and a heat generating electronic component such as an MPU or CPU that is driven at a higher clock frequency is mounted. Therefore, it is possible to improve the performance of the electronic device 50.

  In the above description of the embodiments, the dimensions, quantities, materials, shapes, relative arrangements, and the like of the constituent elements are within the scope of the present invention unless otherwise specified. The present invention is not intended to be limited only to this, but is merely an explanation of one embodiment, and various modifications are possible. For example, it is desired to control the height, size, number of side surfaces, etc. of the flow dividing member. It may be appropriately changed depending on the air flow direction, may be provided not on the fan frame but on the fan cover, and the outer shape of the casing is not substantially square or substantially parallelogram. Or other various polygons may be sufficient, an air inlet may be arrange | positioned only in any one of a fan cover or a fan frame, and an air blower outlet may be provided only in one direction or 3 or more. Yo .

  Further, the configuration of the casing is not simply composed of a fan cover and a fan frame. For example, as described in the second embodiment, a heat generating electronic component and a thermal connection are partially connected to the fan frame. It may be configured to provide a heat receiving part for performing heat treatment, or a heat sink having a heat dissipation property integrally provided by die casting or press molding, and further, a heat pipe or a heat conductive sheet for efficiently performing heat transport therebetween A heat transporting member such as may be provided.

  Further, the centrifugal fan may be any centrifugal fan that has a plurality of blades and blows air in the centrifugal direction by the rotation of the blades. For example, the blade is formed only on the outer peripheral portion like a sirocco fan. In this case, the rotation center axis may be interpreted as corresponding to the center axis of a virtual outer circumference formed by the outer circumference of the blade.

(Embodiment 4)
FIG. 11 is a perspective view of the centrifugal fan device according to Embodiment 4 of the present invention with the fan cover removed, and FIG. 12A shows the centrifugal fan device of Embodiment 4 of the present invention with the fan cover removed. 12 (b) is a cross-sectional view taken along the line BB in FIG. 12 (a), and FIG. 13 is a graph of wind speed distribution showing the diversion action of the diversion member in Embodiment 4 of the present invention. It is.

  In the present embodiment, the shape of the flow dividing member of the first and second embodiments is changed, and the shape of the flow dividing member will be described below.

  First, as shown in FIG. 11, the flow dividing member 206 is provided in the ventilation path 205 between the side wall surface 203 of the fan frame 202 located on the outer peripheral side of the centrifugal fan 201 and the air outlet 204. It is integrally formed on the inner surface of the bottom of the frame. The flow dividing member 206 may be provided as a separate member from the bottom of the fan frame 202.

  Here, the height of the flow dividing member 206 is set lower than the height of the side wall surface of the fan frame 202. By reducing the height of the flow dividing member 206, the air passing through the air outlet 204 is divided in the direction of the central axis of rotation of the centrifugal fan 201. Further, the air diverted above the diverting member 206 passes through the side wall surface 203 to the air outlet 204, while the air diverted along the diverting member 206 is the side wall surface of the diverting member 206 on the centrifugal fan 201 side. To the air outlet 204.

  As a result, the air divided above the flow dividing member 206 and the air divided along the flow dividing member 206 are divided in a direction perpendicular to the rotation center axis of the centrifugal fan 201. At this time, the side wall surface of the flow dividing member 206 on the centrifugal fan 201 side first directs the direction of the air flow generated by the rotation of the centrifugal fan 201 toward the air outlet 204 and then the side wall surface of the flow dividing member 206. The air flowing along the air outlet 204 is provided in an arc so as to be further away from the air flowing along the side wall surface 203 in the vicinity of the air outlet 204.

  As shown in FIG. 12A, the flow dividing member 206 is provided on the first surface 206a provided on the centrifugal fan 201 side, the second surface 206b provided on the side wall surface 203 side, and on the air outlet 204 side. The third surface 206c and the fourth surface 206d, which is the upper surface of the flow dividing member 206, are formed. The first surface 206a has a straight portion that first directs the direction of the air flow generated by the rotation of the centrifugal fan 201 toward the air outlet 204, and then the air flowing along the side wall surface of the flow dividing member 206 is In the vicinity of the air outlet 204, it has a curved portion provided in an arc so as to be further away from the air flowing along the side wall surface 203. The second surface 206b has an inclined surface that lowers the air diverted above the diverting member 206 to the side wall surface 203 side. The third surface 206c is provided to the fan frame 202 so as to allow the air diverted above the diverting member 206 and the air diverted along the diverting member 206 to go back and forth in the vicinity of the air outlet 204. It is inclined with respect to it. The fourth surface 206 d is a surface provided on the upper surface of the flow dividing member 206 and parallel to the bottom surface of the fan frame 202.

  As shown in FIG. 12B, the first surface 206 a is provided substantially perpendicular to the fan frame 202, while the second surface is inclined with respect to the bottom surface of the fan frame 202. . Further, the height Hb of the flow dividing member 206 from the inner surface of the fan frame 202 is set to be lower than the height Hf of the side wall surface 203 from the inner surface of the fan frame 202.

  The operation of the centrifugal fan device of the present embodiment configured as described above will be described.

  First, when the centrifugal fan 201 rotates, an air flow is generated inside the fan frame 202. This air flow is divided in the direction of the central axis of rotation of the centrifugal fan 201 by the flow dividing member 206. Further, the air diverted above the diverting member 206 spreads from the fourth surface 206 d along the second surface 206 b, and escapes to the air outlet 204 along the side wall surface 203. On the other hand, the air diverted along the diverting member 206 passes through the first surface 206 a of the diverting member 206 to the air outlet 204. As a result, the air divided above the flow dividing member 206 and the air divided along the flow dividing member 206 are divided in a direction perpendicular to the rotation center axis of the centrifugal fan 201. Further, the air that is diverted along the flow dividing member 206 by the curved portion of the side wall surface 206 a as it approaches the vicinity of the air outlet 204 is further separated from the air that flows along the side wall surface 203 in the vicinity of the air outlet 204. Move away. Thereby, the space between the air flowing along the side wall surface 203 in the vicinity of the air outlet 204 and the air diverted along the flow dividing member 206 is widened at the air outlet 204. On the other hand, the third surface 206 c allows the air diverted above the diversion member 206 and the air diverted along the diversion member 206 to come and go.

  FIG. 13 is a graph of wind speed distribution showing the result of wind speed measurement similar to that of the second embodiment in which the centrifugal fan device of the present embodiment is provided with heat radiation fins. According to FIG. 13, it can be seen that the airflow ratio is improved and the airflow ratio is more uniform in the slit symbols F2 and F4 in the flow dividing member 206 of the present embodiment than in the flow dividing member 28 of the second embodiment.

  The centrifugal fan device according to the present invention and the electronic device equipped with the centrifugal fan device reduce the deviation of the air volume of the air blown out from the air outlet, and evenly blow out the air and increase the air volume over a wide range. The present invention is useful as a centrifugal fan device that forcibly radiates heat from a heat pipe or a liquid refrigerant circulation system that efficiently transports heat to the heat radiating body, and an electronic device including the centrifugal fan device.

The perspective view of the centrifugal fan apparatus in Embodiment 1 of this invention The perspective view in the state which removed the fan cover of the centrifugal fan apparatus in Embodiment 1 of this invention (A) Top view in the state which removed the fan cover of the centrifugal fan apparatus in Embodiment 1 of this invention, (b) AA arrow sectional drawing of (a). The partial expansion perspective view of the centrifugal fan apparatus in Embodiment 1 of this invention (A) Partial expansion perspective view which showed the flow of the air in the vicinity of the flow dividing member in Embodiment 1 of this invention, (b) The schematic diagram which shows the flow of the air of (a) (A) The perspective view of the centrifugal fan apparatus in Embodiment 2 of this invention, (b) The perspective view which reversed the centrifugal fan apparatus of (a) The top view in the state which removed the fan cover of the centrifugal fan apparatus in Embodiment 2 of this invention (A) Perspective view of a state in which a wind speed distribution measuring plate is mounted on the centrifugal fan device, (b) a wind speed distribution graph showing the diversion action of the diversion member. (A) The figure which showed the inside of the housing | casing of the electronic device in Embodiment 3 of this invention, (b) Sectional drawing which showed the principal part of (a) (A) The side view which shows the inside of the casing of the centrifugal fan apparatus in a prior art, (b) The front view which notched some casings of the centrifugal fan apparatus in a prior art The perspective view in the state which removed the fan cover of the centrifugal fan apparatus in Embodiment 4 of this invention. (A) Top view in the state which removed the fan cover of the centrifugal fan apparatus in Embodiment 4 of this invention, (b) BB arrow sectional drawing of (a). Graph of wind speed distribution showing the diversion action of the diversion member in Embodiment 4 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Centrifugal fan apparatus 2 Casing 2a Fan cover 2b Fan frame 3a Air suction port 3b Air suction port 4 Centrifugal fan 4a Hub part 4b Blade 4c Rotation center axis 5 Air outlet 6 Protruding part 7 Spoke 8 Side wall surface 9 Ventilation path 10 Dividing member 10a 1st side surface 10b 2nd side surface 10c 3rd side surface 21 Centrifugal fan device 22 Casing 22a Fan cover 22b Fan frame 22c Convex part 23 Centrifugal fan 23a Hub part 23b Blade 23c Rotation center axis 24 Radiation fin 24p Measurement plate 25 Radiation fin 25p Measurement plate 26 Heat receiving part 27 Heat pipe 28 Current diverting member 28a First side face 28b Second side face 28c Third side face 29a Air inlet port 29b Air inlet port 30 Spoke 31 Side wall surface 32 Air outlet port 33 Ventilation DESCRIPTION OF SYMBOLS 50 Electronic device 51 Liquid crystal display device 52 Main body apparatus 52a Case side surface 52b Case bottom surface 53 Hinge mechanism 54 Circuit board 55 Radiation fin 56 Centrifugal fan device 57 Fan cover 58 Fan frame 58a Air intake port 58b Side wall surface 59 Ventilation port 60 Centrifugal fan 60a Rotation center shaft 61 Flow dividing member 62 Air outlet 63 Air vent 201 Centrifugal fan 202 Fan frame 203 Side wall surface 204 Air outlet 205 Ventilation path 206 Flow dividing member 206a First surface 206b Second surface 206c Third surface 206d Surface 4 Centrifugal fan rotation direction Hb Height of flow dividing member Hf Side wall surface height W Third side surface width θa Angle of first side surface relative to fan frame θb Angle of second side surface relative to fan frame

Claims (4)

A centrifugal fan that blows air in the centrifugal direction by rotation of the blade;
A casing having a side wall having an air outlet that houses the centrifugal fan and blows air to a side of the outer peripheral side of the centrifugal fan, and a parallel member having an air inlet that covers the blade and sucks air;
A diversion member standing on the inner surface of the parallel member of the casing and extending from the side wall to the air outlet and lower than the height of the side wall surface of the side wall ,
The centrifugal fan device according to claim 1 , wherein a side surface on the blade side of the flow dividing member is substantially perpendicular to the inner surface, and a side surface on the side wall side of the flow dividing member is inclined with respect to the inner surface . The end surface of the air outlet side of the diverting member is a centrifugal fan according to claim 1, wherein the inclined with respect to the said inner surface. Before SL diverting member according to claim 1, characterized in that diverting the two directions of the rotation center axis direction and the centrifugal fan orthogonal air passing to the air outlet and the central axis of rotation of the centrifugal fan Centrifugal fan device. The electronic device which comprises the centrifugal fan apparatus of any one of Claim 1 to 3 .

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