JP4973539B2 - Cooling fan and electronic equipment - Google Patents

Description

  The present invention relates to a cooling fan for cooling an electronic component, and an electronic apparatus including the electronic component and the cooling fan.

For example, in an electronic device equipped with a plurality of electronic devices, such as a blade-type server, the amount of heat generated increases with the increase in integration and capacity of the electronic device. It is important to reliably process the heat generated in the interior.
In order to perform such heat treatment, the following electronic devices have been developed.

FIG. 15 is a schematic cross-sectional view showing the structure of a conventional electronic device.
As shown in FIG. 15, a plurality of units 300, 300,... Each having a plurality of electronic devices mounted in a housing 200 of the electronic device 100 are arranged in parallel at a predetermined distance from each other. .. Are disposed on one side surface of the housing 200, and each unit 300 in the housing 200 is provided by each cooling fan 500, 500,. Cooling air is introduced to 300,.

  However, in the electronic apparatus 100 provided with a plurality of cooling fans 500, 500,..., When a failure occurs in one of the cooling fans 500, the other cooling fans 500, The cooling air introduced into the casing 200 by 500,... Is subjected to resistance by the units 300, 300,. Since the ventilation resistance is very low, a part of the cooling air introduced by other cooling fans 500, 500,... In operation is hardly supplied to each unit 300, 300,. A so-called reverse flow phenomenon G that flows out of the opening of the casing 200 from the opening of the cooling fan 500 occurs.

Therefore, a necessary amount of cooling air is not supplied to each unit 300, 300,... Near the cooling fan 500, and the ambient temperature of the unit 300, 300,. The operation of the units 300, 300,... Becomes poor and the system including the electronic device 100 may go down.
Therefore, Patent Document 1 described later discloses the following axial flow type cooling fan.

  That is, a plurality of support bosses are protruded at predetermined intervals in the circumferential direction on a peripheral surface of a bottomed cylindrical impeller attached to an output shaft of a motor disposed in an intake opening. Each has a wind receiving wall portion provided obliquely, and blades having a substantially square shape in plan view are provided so as to be rotatable around the support boss. On the other hand, a pair of stoppers project around each boss at a predetermined distance, and a locking rod that engages with the pair of stoppers projects from the rotating shaft of each blade.

  In such a cooling fan, when the impeller is rotated by driving the motor, each blade is moved around each support boss by the resistance force of the wind received by the wind receiving wall portion of each blade provided in the impeller. When each blade is rotated by a required angle, the locking rod provided on the rotation shaft of each blade comes into contact with one stopper, so that the opening of the cooling fan is opened and each blade is The wind generated by each blade is supplied in the axial direction of the output shaft of the motor.

On the other hand, in the electronic apparatus in which the plurality of cooling fans described above are disposed in the housing, when one of the cooling fans fails, another cooling fan is provided on each blade of the cooling fan. The wind due to the backflow phenomenon described above is blown from the fan, but the blades rotate to a closed position where the distance between adjacent blades is narrowed by the force of the wind, so the failed cooling fan opening is blocked. The backflow phenomenon is prevented.
JP 2005-201198 A

  However, in such a conventional cooling fan, each blade is only supported by each support boss protruding from the impeller so that the backflow phenomenon is eliminated as described above. Thus, when the force to maintain the posture of each blade in the closed posture is lost, the external air flow generated by the intake air of the other cooling fans acts on each blade of the failed cooling fan, causing the blades to wake up There has been a problem that it repeats that it rotates in the direction to become a posture and invites the above-described backflow phenomenon again.

  This invention is made | formed in view of such a situation, Comprising: The cooling fan which can prevent the invitation of a backflow phenomenon, and an electronic device provided with this cooling fan are provided.

  (1) The cooling fan is attached to a housing in which an electronic component is housed, and has a hollow cylindrical portion that blows air, a cylindrical base in the cylindrical portion, and a central axis of the base is Arranged in parallel with the central axis of the cylindrical portion, a plurality of blades are provided on the peripheral surface of the base so that the posture can be changed between a wind generating posture for generating wind and a closed posture for substantially closing the cylindrical portion. An impeller and a motor that rotationally drives the impeller are provided, and when the wind generated by the rotation of the impeller is discharged from the tube portion to cool the electronic component, power is generated by the rotational drive of the motor. A power generation unit, posture changing means for changing each blade in the closed posture to a wake posture by electric power supplied from the power generation unit, and posture return means for returning each blade in the wake posture to the closed posture.

  In the present cooling fan, an impeller is arranged in a hollow cylindrical portion that is attached to a housing in which an electronic component is housed and blows air, and the impeller is driven by a motor. The electronic component is cooled by discharging the wind generated by the rotational drive from the cylindrical portion. The above-described cylindrical portion is provided, for example, on a cooling fan frame, and the frame is attached to a housing in which electronic components are accommodated.

  This impeller is provided with a plurality of blades on the peripheral surface of a cylindrical base, and the base of the base is arranged in parallel with the central axis of the cylindrical portion. That is, this cooling fan is an axial flow type fan. Further, each blade can be changed in posture between a wind raising posture for generating wind and a closed posture for substantially closing the tube portion.

  In addition, the cooling fan includes a power generation unit that generates electric power by rotating the motor, and posture changing means that changes each blade in the closed posture to a wind-up posture by the electric power supplied from the power generation unit. Thus, while the impeller is rotationally driven by the motor, the posture changing means changes each blade in the closed posture to the wind-up posture, and the wind generated by each blade in the wind-up posture is the tube portion of the frame. It is discharged from.

  Further, the cooling fan includes posture returning means for returning each blade in the wind raising posture to the closed posture. When the motor fails and the rotational drive of the motor stops, the power generation unit described above also stops power generation, so that the posture changing operation of each blade to the wind-up posture by the posture changing means also stops. And since each blade | wing of a wind raising posture is returned to a closed posture by a posture return means, when a motor fails, each blade | wing is hold | maintained at a closed posture.

  As a result, even if one of the plurality of cooling fans disposed in the housing fails, the blades are held in the closed posture by the posture returning means as described above, so that the reverse flow phenomenon occurs. Occurrence can be prevented.

  (2) The cooling fan is rotated around the rotation shaft portion for changing the posture of the blade by rotation and the rotation shaft portion as needed, respectively, at the base portion of each blade. A posture changing shaft portion for changing the posture of the blade, and the posture changing means is configured to rotate the posture changing shaft so that the blade rotates from the closed posture to the wind raising posture by a rotational force. A first urging portion for urging the portion, and a first link member for transmitting the urging force of the first urging portion to each of the posture changing shaft portions.

  Further, in the cooling fan, the base of each blade has a rotating shaft portion for changing the posture of the blade by rotation, and is rotated around the rotating shaft portion to rotate the blade. A posture changing shaft portion for changing the posture is projected.

  The posture changing means described above generates a rotational force like a motor, and biases the posture changing shaft portion by the rotational force so that the blade rotates from the closed posture to the wind raising posture. The first urging portion is provided, and the urging force of the first urging portion is transmitted to each of the posture changing shaft portions by the first link member. The first urging unit is driven by the electric power supplied from the power generation unit described above.

  A stepping motor can be used as the first urging unit. When a stepping motor is used, each blade can be accurately held in a required wake posture, and the holding stability in the posture is high.

  As described above, since the posture changing means is constituted by the first urging portion and the first link member, the posture changing means can be made relatively simple. On the other hand, during the rotational driving of the motor, the posture returning means is attached. The blades can be reliably changed from the closed posture to the wind-up posture against the tendency.

  (3) Further, the cooling fan is rotated around the rotation shaft portion for changing the posture of the blade by rotation and the rotation shaft portion, respectively, as necessary. A posture changing shaft for changing the posture of the blade by moving is projected, and the posture changing means changes the posture so that the blade rotates from the closed posture to the wind raising posture by electromagnetic force. A second urging portion for urging the shaft portion, and a second link member for transmitting the urging force of the second urging portion to the posture changing shaft portions.

  In the cooling fan, the base of each blade has a rotating shaft for changing the posture of the blade by rotation, and the posture of the blade is rotated by rotating around the rotating shaft. A posture changing shaft portion for changing is projected.

  On the other hand, the posture changing means includes a second urging portion for urging the posture changing shaft portion so that the blades are rotated from the closed posture to the wind raising posture by electromagnetic force, and the second urging portion. And a second link member that transmits the urging force to the posture changing shafts.

  For example, the second urging portion can be composed of an electromagnet fixed to the second link member and a magnetic body fixed to the base so as to face the electromagnet at a position appropriately spaced from the electromagnet. The electromagnet moves to the magnetic body so that the electromagnet and the magnetic body are attracted by the electromagnetic force generated by feeding the electromagnet from the power generation unit by driving the motor. It moves and is urged | biased by the said attitude | position change axial part so that the said blade | wing may rotate from a closed attitude | position to a wind raising attitude | position by the said 2nd link member.

In addition, you may make it provide an electromagnet in the base | substrate side and a magnetic body in a 2nd link member.
As described above, since the posture changing means is constituted by the second urging portion and the second link member, a relatively simple configuration can be achieved. On the other hand, during the rotational driving of the motor, the posture returning means described above can be used. The blades can be reliably changed from the closed posture to the wind-up posture against the bias.

  In addition, when the second urging portion is composed of an electromagnet and a magnetic body, the moving range of the electromagnet or the magnetic body is determined in advance, so that each blade is accurately changed to the required closed posture and the required wind-up posture. Can do.

  (4) On the other hand, if necessary, the posture return means urges the posture changing shaft to bias the posture changing shaft portion so that the blades are rotated from the wake-up posture to the closed posture by an elastic force. 1 It has an urging part for return.

  The first return urging portion can be composed of an elastic body such as a spring or rubber, and the posture of each blade such that the blade is rotated from the wake posture to the closed posture by the elastic force of the elastic body. Energize the change shaft.

The urging force by the first returning urging unit is weaker than the urging force of the first urging unit or the second urging unit described above. Therefore, while the motor is rotating, the blades are brought into a wind-up posture by the urging force of the first urging unit or the second urging unit against the urging force of the first returning urging unit. On the other hand, when the rotation of the motor stops due to a failure, the urging force of the first urging unit or the second urging unit disappears. It is held in a closed position.
As a result, even if one of the plurality of cooling fans disposed in the casing fails, each blade is held in the closed posture, so that the backflow phenomenon can be prevented from occurring.

  (5) Further, if necessary, in the cooling fan, the posture returning means urges the posture changing shaft portion so that the blades are rotated from the wake posture to the closed posture by a magnetic force. A return biasing unit is provided.

  The second return biasing unit can be composed of a permanent magnet and a magnetic body (including an electromagnet when power is not supplied). For example, the permanent magnet is fixed to the base, and the magnetic body is fixed to the first link member or the second link member described above so as to face the permanent magnet. A permanent magnet may be disposed on the first link member or the second link member, and a magnetic body may be disposed opposite to the base, or an electromagnet may be disposed instead of the permanent magnet.

  The second return biasing unit biases the blades for changing the posture of the blades so that the blades are rotated from the wake-up posture to the closed posture by the magnetic force generated between the magnet and the magnetic body. .

Also, the urging force by the second return urging unit is weaker than the urging force of the first urging unit or the second urging unit, as before. Accordingly, while the motor is rotating, the blades are brought into a wind-up posture by the urging force of the first urging unit or the second urging unit against the urging force of the second returning urging unit. On the other hand, when the rotation of the motor is stopped due to a failure, the urging force of the first urging unit or the second urging unit disappears. It is held in a closed position.
As a result, even if one of the plurality of cooling fans disposed in the casing fails, each blade is held in the closed posture, so that the backflow phenomenon can be prevented from occurring.

  (6) By the way, this electronic apparatus is provided with a plurality of axial-flow type cooling fans in a housing in which the electronic parts are housed, and the electronic parts are cooled by the air discharged from each cooling fan. And includes any one of the cooling fans described above.

  As a result, as described above, even if one of the plurality of cooling fans disposed in the casing fails, each blade is held in the closed posture, so that the backflow phenomenon is reliably generated. Can be prevented.

(First embodiment)
FIG. 1 is a schematic plan sectional view showing an example of an electronic apparatus according to the present invention.
As shown in FIG. 1, the electronic apparatus 1 includes, for example, a rectangular housing 2 in which a plurality of units 3, 3,... Each having a plurality of electronic devices mounted on a substrate are separated from each other by a predetermined distance. They are arranged in parallel. A plurality of axial-flow type cooling fans F, F,... Are arranged on one side surface of the casing 2, and each unit 3 in the casing 2 is provided by each cooling fan F, F,. Cooling air is introduced to 3,.

  2 and 3 are front views of the cooling fan F shown in FIG. 1. FIG. 2 shows a normal state, and FIG. 3 shows a failure state. 4 is a partially omitted plan view of the cooling fan shown in FIG.

  As shown in FIGS. 2 to 4, the cooling fan F includes a frame 11 in which a circular opening 15 is arranged at the center, and the center of the opening 15 of the frame 11 is a motor described later (see FIG. 8). A circular support plate portion 13 for supporting the support plate 13 and arm portions 12, 12, and 12 for supporting the support plate portion 13 are provided.

  An impeller 19 is rotatably inserted into the opening 15, and the impeller 19 is rotationally driven by the motor. The impeller 19 has a diameter substantially the same as the diameter of the support plate portion 13, and a plurality of blades 21, 21,. The blades 21, 21,... Are standing at intervals, and the blades 21, 21,... Have a wind-up posture that generates wind by driving the motor, and a closed posture that closes the opening 15 as much as possible when the motor stops. It can be changed.

  .. Corresponding to each of the blades 21, 21,..., The base portions of the blades 21, 21,. Are projecting in a direction intersecting with the central axis of the base 20 with a curvature corresponding to the base of the blades 21, 21,.

  Each blade 21, 21,... Has a shape obtained by cutting an acute apex portion of a plate material having a substantially right triangle in front view into an arc shape according to the peripheral surface of the base body 20. The top is arcuate. Each of the blades 21, 21,... Is attached to the base body 20 so that the base portion cut in the above-described arc shape is slidably brought into contact with the peripheral surface of the base body 20 and is in the same direction. Thus, a head portion 21a rising from the base portion to a substantially perpendicular top portion and a tail portion 21b rising from the base portion to another acute top portion are formed.

The height dimension of each blade 21, 21, ... is substantially the same as the dimension from the peripheral surface of the base 20 to the portion facing the opening 15 of the frame 11, and the area of each blade 21, 21, ... In the closed posture described above, the mounting intervals are such that the opposing edges of the adjacent blades 21, 21, 21, 21,. As a result, as shown in FIG. 3, the opening 15 is closed as much as possible by the blades 21, 21,.
The shape of the blade 21 is not limited to this, and in the wind posture, the blade 21 can wind in the axial direction of the motor, and in the closed posture, the blade 15 is closed as much as possible. I just need it.

FIG. 5 is an exploded perspective view, partly omitted, of the cooling fan shown in FIG. In both figures, the same reference numerals are given to the portions corresponding to the portions shown in FIG.
As shown in FIG. 5, a rotation shaft portion 22 serving as a rotation fulcrum of the blade 21 protrudes at an appropriate position on the tail portion 21 b side of the blade 21 on the base end surface of the blade 21 in contact with the base body 20. In addition, it is guided by a guide hole 24 to be described later at an appropriate position on the head 21a side of the blade 21 at the base end surface of the blade 21, and changes the posture of the blade 21 into a wind-up posture and an open posture. A posture changing shaft portion 23 for projecting is provided.

  On the other hand, a through-hole 26 (, 26, 26) that penetrates the rotation shaft portion 22 of the blade 21 is located on the peripheral surface of the base body 20 and at the position closer to the opening 20b end side of the base body 20 than the above-described posture holding guide part 25. .. Are opened corresponding to the blades 21, 21,..., And in the vicinity of the through-holes 26 (26,...), Guide holes which are long holes for guiding the posture changing shaft portion 23 described above. 24 (, 24,...) Are provided in a substantially arc shape around each through hole 26 (, 26,...).

  Then, the rotating shaft portion 22 of the blade 21 is inserted into the through hole 26 of the base body 20, and the posture changing shaft portion 23 of the blade 21 is inserted into the guide hole 24 of the base body 20 so that the blade 21 is attached to the base body 20. The blade 21 can be rotated around the rotation shaft portion 22 within a range in which the posture changing shaft portion 23 is guided in the guide hole 24 and moves from one end to the other end thereof.

  , And the tip portions of the rotation shaft portions 22, 22,... Of the blades 21, 21,... And the tip portions of the posture changing shaft portions 23, 23,. The projecting portions of the rotary shafts 22, 22,... Are made of elastic members such as torsion coil springs, and the posture returning members 51 are configured to return the blades 21, 21,. , 51,... Are attached. Further, biasing portions 32, 32,... Of the first link member 30 described later are in contact with the protruding portions of the posture changing shaft portions 23, 23,.

6 is a perspective view of the first link member 30 shown in FIG.
As shown in FIG. 6, the first link member 30 includes an annular body 31 having an outer diameter slightly smaller than the inner diameter of the base body 20 (see FIG. 5) of the impeller 19. A plurality of substantially rectangular urging portions 32, 32,... Project from the one end edge of the ring body 31 at a predetermined distance in the circumferential direction of the ring body 31. The tips of the parts 32, 32, ... are brought into contact with the posture changing shaft parts 23, 23, ... (see Fig. 5).

  At the other end edge of the ring body 31, a flange portion 33 provided with a fan-shaped base portion 33 a by opening the central portion of the disk in a 3/4 circular shape toward the center of the ring body 31. A short rack 34 is erected in parallel with the central axis of the ring body 31 at the corner position of the base portion 33a.

FIG. 7 is a partially omitted perspective view of the cooling fan F and shows the internal structure of the base body 20 of the impeller 19. In the figure, parts corresponding to those shown in FIG.
The first link member 30 is fitted in the base 20 so as to be able to advance and retract in the axial direction of the central axis of the base 20, while a stepping motor is used at an appropriate position on the closing portion 20 a of the base 20. The first posture changing drive unit (first urging unit) 40 for changing the posture of the blades 21, 21,... From the closed posture to the wind raising posture is fixed. A gear 41 externally fitted to the output shaft of the first posture changing drive unit 40 is engaged with the rack 34 of the first link member 30, and the first posture changing drive unit 40 is rotated forward. The first link member 30 is driven forward.

As described above, the biasing portions 32, 32,... Of the first link member 30 are brought into contact with the posture changing shaft portions 23, 23,. When the first link member 30 moves forward by the forward rotation of the portion 40, the posture changing shaft portions 23, 23,... That are in contact with the urging portions 32, 32,. The guide holes 24, 24,... (See FIG. 5) are slid from one end to the other end.
As a result, the closed blades 21, 21,... Rotate around the rotation shafts 22, 22,.

On the other hand, engaging members 50, 50,... That engage with the posture changing shafts 23, 23,. 50, 50,... Are fixed to one end of the posture return members 51, 51,. The other end portions of the posture returning members 51, 51,... Are fixed to the base 20, and the posture changing shaft portions 23, 23,. .. Are biased from 51, 51,... So that the blades 21, 21,.
.. And the engaging members 50, 50,... Constitute a first returning biasing portion.

  The biasing force on the first link member 30 by the first posture changing drive unit 40 is larger than the biasing force on the posture changing shafts 23, 23,... By the posture returning members 51, 51,. Therefore, while the first posture changing drive unit 40 is operating, the blades 21, 21,... On the other hand, when the operation of the first posture changing drive unit 40 is stopped, the posture changing shaft portions 23, 23 are applied by the biasing force to the posture changing shaft portions 23, 23,. Are slid from the other end to the other end in the guide holes 24, 24,... (See FIG. 5), and the first link member 30 is retracted to change the blades 21, 21,. . Further, the blades 21, 21,... Are held in the closed posture by the biasing force of the posture return members 51, 51,.

  In this embodiment, the posture returning member 51 is biased to the posture changing shaft portion 23 via the engaging member 50. However, the present invention is not limited to this and the posture returning member is not limited thereto. You may make it urge | bias directly from 51 to the axial part 23 for attitude | position change. Further, in the present embodiment, the case where the posture returning member 51 is attached to the rotating shaft portion 22 has been described. However, the present invention is not limited to this, and the posture returning member is provided on the inner peripheral surface of the first link member 30. A support part for supporting 51 may be provided. Further, a posture returning member is installed between the closing portion 20a of the base body 20 and the posture changing shaft portion 23, and a tensile force is applied from the posture returning member to the posture changing shaft portion 23. May be.

  On the other hand, in the present embodiment, the case where the stepping motor is used as the first posture changing drive unit 40 has been described. However, the present invention is not limited to this, and other motors such as a geared motor may be used. it can. If necessary, an appropriate gear and / or cam can be incorporated.

FIG. 8 is a schematic diagram for explaining a power feeding mechanism that feeds power to the first posture changing drive unit 40 shown in FIG. 7. In FIG. 8, 20 is the aforementioned base, and 60 is a motor that rotates the impeller.
As shown in FIG. 8, a connecting member (not shown) is externally fixed to the output shaft 61 of the motor 60. The base member 20 is connected to the output shaft 61 by the connecting member, and the output shaft is driven by driving the motor 60. 61, the connecting member and the base 20 are driven to rotate.

  On the other hand, an iron core 71 constituting the power generation unit 70 is fitted and fixed to the output shaft 61. The iron core 71 has a bobbin shape in which both disc-shaped flange portions 71a and 71b are arranged to face each other with an appropriate distance, and a coil 72 is wound in a bobbin groove between the both flange portions 71a and 71b. is there. The diameters of the flange portions 71a and 71b are slightly smaller in the other flange portion 71a than in the flange portion 71b on the motor 60 side. A plurality of (four in FIG. 8 each) leg portions 72a, 72a,..., 72b, 72b,... Made of the same material as the flange portions 71a, 71b are provided around the peripheral portions of the flange portions 71a, 71b. It is erected in a direction away from the motor 60 at a predetermined angle in the direction. The tip positions of the leg portions 72b, 72b,... Provided on the flange portion 71b on the motor 60 side and the tip positions of the leg portions 72a, 72a,... Provided on the other flange portion 71a are substantially the same. 72a, 72a,..., 72b, 72b,... Are shifted in the circumferential direction by a predetermined angle so as not to overlap each other.

  A plurality of (8 in FIG. 8) permanent magnets having different polarities are arranged in the circumferential direction in the vicinity of the other flange portion 71a and surrounded by the leg portions 72a, 72a,..., 72b, 72b,. An annular magnet member 73 that is coupled to is loosely fitted. The magnet member 73 is supported by a support member (not shown) fixed to the frame 11 (see FIG. 7).

  On the other hand, the base 20 is provided with a rectifier circuit 74, and the induced electromotive force generated in the coil 72 is rectified by the rectifier circuit 74 and supplied to the first attitude changing drive unit 40 described above. Yes.

  In such a power generation part 70, while the motor 60 operates and the output shaft 61 and the iron core 71 are rotating, from the magnet member 73 to leg part 72a, 72a, ..., 72b, 72b, ... On the other hand, an induced electromotive force is generated in the coil 72 due to a change in the magnetic flux, but when the motor 60 stops due to a failure, the output shaft 61 and the iron core 71 also stop rotating, and therefore no induced electromotive force occurs in the coil 72.

  Therefore, while the motor 60 is operating, power is supplied from the power generation unit 70 to the first posture changing drive unit 40. However, when the motor 60 stops due to a failure, the power generation unit 70 supplies the first posture changing drive unit 40. Power supply to is also stopped.

9 to 11 are explanatory views for explaining the posture changing operation of the blades 21, 21,..., FIGS. 9 and 10 show the wake posture, and FIGS. 11 and 12 show the closed posture, respectively. .
As described above, since the electric power is supplied from the power generation unit 70 (both refer to FIG. 8) to the first posture changing drive unit 40 while the motor 60 is operating, as shown in FIG. , And the biasing portions 32, 32,... Of the first link member 30 cause the posture changing shaft portions 23, 23,... And the engaging members 50, 50,. Against the force, it turns around the turning shafts 22, 22,... Toward the opening 20 b of the base 20.

  At this time, as shown in FIG. 10, each blade 21, 21,... Rotates around the rotation shafts 22, 22,... Until the base abuts against the posture holding guide parts 25, 25,. Thus, the blades 21, 21,.

On the other hand, when the motor 60 stops due to a failure, the power supply from the power generation unit 70 shown in FIG. 8 to the first posture changing drive unit 40 is also stopped, so that as shown in FIG. The posture changing shafts 23, 23,... Are moved in the guide holes 24, 24,... By the urging force from the posture returning members 51, 51,. The first link member 30 is retracted while being slid from the other end to the one end.
At this time, as shown in FIG. 12, the blades 21, 21,... Rotate around the rotation shafts 22, 22,.

  While the motor 60 is stopped, the blades 21, 21,... Are closed by the biasing force from the posture return members 51, 51,. Retained.

  As a result, in the electronic apparatus 1 including the plurality of cooling fans F, F,... As shown in FIG. 1, when one cooling fan F fails, as shown in FIGS. Are changed from the wind-up position to the closed position, so that the above-described backflow phenomenon is prevented and the cooling fan F is in a failure state. Since the blades 21, 21,... Are held in the closed posture, the backflow phenomenon is prevented from being caused.

  In the present embodiment, power is supplied to the first posture changing drive unit 40 during operation of the motor 60 that rotates the impeller 19, but the present invention is not limited to this, and the first posture is changed. By interposing a lock mechanism including gears, cams, pawls, and the like between the change driving unit 40 and the rack 34, the rack 34 is held at a required position and moved to the first posture changing drive unit 40. The power supply can be stopped. In this case, the lock mechanism is unlocked when the motor 60 is stopped. Thereby, the lifetime of the first posture changing drive unit 40 can be extended.

  Further, in the present embodiment, it is a base end surface that contacts the base body 20 of the blade 21, and the rotation shaft portion 22 is on the tail portion 21 b side of the blade 21 and the posture is changed on the head portion 21 a side of the blade 21. Each of the shaft portions 23 is projected, and the first link member 30 and the posture changing shaft portion 23 are moved from the closed portion 20a side to the opening portion 20b side of the base body 20 by the first posture changing drive portion 40. When the motor 60 breaks down while the blades 21, 21,... Are in a wake-up posture, the first link member 30 and the posture changing shaft 23 are moved to the base 20 by the posture return members 51, 51,. The blades 21, 21,... Are closed by moving from the opening 20 b side to the closing portion 20 a side. However, the present invention is not limited to this, and is the base end surface of the blade 21. The rotating shaft part 22 on the head 21a side, Posture change shaft portions 23 project from the tail portion 21 b side of the root 21, and the first posture change drive portion 40 causes the first link member 30 and the posture change shaft portion 23 to be connected from the opening 20 b side of the base body 20. When the motor 60 fails, the first link member 30 and the posture are returned by the posture return members 51, 51,... It goes without saying that each of the blades 21, 21,... May be configured to be in a closed posture by moving the changing shaft portion 23 from the closed portion 20 a side to the opening portion 20 b side of the base body 20.

(Second Embodiment)
FIGS. 13 and 14 are partially omitted perspective views showing the main configuration of the cooling fan according to the second embodiment together with a partially enlarged view thereof. FIG. 13 shows a normal state, and FIG. Each state at the time of failure is shown. In the cooling fan according to the present embodiment, the postures of the blades 21, 21,... Are changed using magnetic force instead of the rotational force by the first posture changing drive unit 40 (see FIG. 7). It ’s like that. In the figure, parts corresponding to those shown in FIG. 7 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 13, a plurality of openings 36, 36,... Having the required dimensions in the vertical direction and the horizontal direction are formed on the peripheral surface of the substantially annular second link member 30 a. Are arranged so as to be opposed to the rotating shaft portions 22, 22,. The ends of the rotary shafts 22, 22,... Protrude into the openings 36, 36,..., And even if the second link member 30a is advanced or retracted, the second link member 30a is It is made not to contact rotation axis part 22,22, ....

  Further, long holes 37, 37,... That are long in the circumferential direction of the second link member 30a are formed in portions of the second link member 30a that face the posture changing shafts 23, 23,. The posture changing shafts 23, 23,... Are fitted into the long holes 37, 37,. Accordingly, when the second link member 30a is advanced and retracted, the posture changing shaft portions 23, 23,... Inserted into the long holes 37, 37,. It is adapted to move forward and backward while sliding in the longitudinal direction.

  On the other hand, a plurality (three in FIG. 13) of notches 38 (, 38,...) Are separated from each other at an appropriate distance in the circumferential direction at the edge of the second link member 30a facing the closing portion 20a of the base body 20. In the portion facing the notch portion 38 (, 38,...) Of the closing portion 20a, a permanent magnet is used, and the depth of the corresponding notch portion 38 (, 38,...). Second posture returning members 51a (, 51a,...) Having a height smaller than the size are fixed.

  At the position where the notch 38 (, 38,...) Of the second link member 30a is provided, from one edge to the other edge of the notch 38 (, 38,...) Side of the second link member 30a. A second attitude changing drive unit 50a (, 50a,...) Formed by embedding the extending electromagnets is arranged, and each of the second attitude changing drive units 50a (, 50a,. (See FIG. 8), power is supplied as described above.

  Further, magnetic bodies 50b (, 50b,...) To which the second posture changing drive units 50a (, 50a,. These are fixed so as to face the respective second posture changing drive units 50a (, 50a,...).

  A second urging unit is configured by the second posture changing drive unit 50a (, 50a,...) And the magnetic body 50b (, 50b,...). Also, the second posture returning member 51a (, 51a,...) And the second posture changing drive unit 50a (, 50a,. The part is composed.

  In such a cooling fan F, as before, while the motor 60 (see FIG. 8) is operating, power is supplied from the power generation unit 70 to the second posture changing drive unit 50a (, 50a,...). Therefore, the second posture changing drive unit 50a (, 50a,...) Is magnetized, and thereby the second posture changing drive unit 50a (, 50a,...) Is applied to the magnetic body 50b (, 50b,...). Since the second link member 30a moves forward by adsorbing and coupling, the blades 21, 21,... Are changed to the wake posture and are held in the wake posture.

  At this time, the magnetism of the second posture return member 51a (, 51a,...) Described above is the second posture return member 51a (, 51a) of the magnetized second posture change drive unit 50a (, 50a,...). ,...). That is, when the end portion of the second posture return member 51a (, 51a,...) Facing the second posture return member 51a (, 51a,...) Is an N pole, the second posture change drive unit 50a ( , 50a,...) Is magnetized to the N pole, and when the end of the second posture return member 51a (, 51a,. The end of the change driving unit 50a (, 50a,...) Is magnetized to the south pole.

  Accordingly, a repulsive force is generated between the magnetized second posture changing drive unit 50a (, 50a,...) And the second posture returning member 51a (, 51a,...). 30a can be advanced more smoothly. Therefore, since the second posture changing drive unit 50a (, 50a,...) Can be configured using an electromagnet having a relatively small output, the second posture changing drive unit 50a (, 50a,...) Can be driven. The power required can be reduced as much as possible.

On the other hand, when the motor 60 stops due to a failure, the power supply from the power generation unit 70 to the second posture change drive unit 50a (, 50a,...) Is also stopped, and the second posture change drive unit 50a (, 50a,. Disappears and the second posture changing drive unit 50a (, 50a,...) Becomes a simple magnetic body, and therefore the magnetic members 50b, 50b,... Of the second posture changing drive unit 50a (, 50a,. While the adsorption to the second posture is canceled, the magnetic force of the second posture returning member 51a (, 51a,...) Acts on the second posture changing drive unit 50a (, 50a,. The second posture changing drive unit 50a (, 50a,...) Is adsorbed and coupled to the return member 51a (, 51a,...). As a result, the second link member 30a moves backward while the posture changing shaft 23 (, 23,...) Slides in the long hole 37 (, 37,...), And the blades 21, 21,. Changed to posture.
While the motor 60 is stopped, the blades 21, 21,... Are held in the closed posture by the adsorption force of the second posture returning member 51a (, 51a,...).

  As a result, in the electronic apparatus 1 including the plurality of cooling fans F, F,... As shown in FIG. 1, when one cooling fan F fails, the blade 21 of the cooling fan F is the same as before. , 21,... Are changed from the wake-up posture to the closed posture, so that the above-described backflow phenomenon is prevented and the blades 21, 21,. Since it is held in the closed posture, it is possible to prevent a reverse flow phenomenon from being caused.

  In the present embodiment, the second posture return member 51a (, 51a,...) And the second posture change drive units 50a, 50a,. However, the present invention is not limited to this, and the position of the second posture returning member 51a (, 51a,...) Is different from that of the second posture changing drive units 50a, 50a,. It may be arranged and a plurality of magnetic bodies may be arranged opposite to the second posture returning member 51a (, 51a,...) On the second link member 30a.

In this case, the second posture returning member 51a (, 51a,...) May be disposed on the second link member 30a, and a magnetic body may be disposed on the base body 20.
Further, in the present embodiment, the second posture changing drive unit 50a (, 50a,...) Is disposed on the second link member 30a, and the magnetic body 50b (, 50b,. Although the present invention is not limited to this, the present invention is not limited to this, and the second link member 30a is provided with the magnetic body 50b (50b,...), And the base body 20 is provided with the second posture changing drive unit 50a (, 50a). Needless to say,...

(Other embodiments)
In addition, in the cooling fan according to the present invention, if necessary, the second return bias described in the second embodiment instead of the first return bias described in the first embodiment. The first return biasing portion may be provided instead of the second return biasing portion described in the second embodiment.

It is a typical plane sectional view showing an example of electronic equipment concerning the present invention. It is a front view of the cooling fan shown in FIG. It is a front view of the cooling fan shown in FIG. FIG. 3 is a partially omitted plan view of the cooling fan shown in FIG. 2. FIG. 3 is a partially exploded partial perspective view of the cooling fan shown in FIG. 2. FIG. 6 is a perspective view of the first link member shown in FIG. 5. FIG. 3 is a partially omitted perspective view of a cooling fan. FIG. 8 is a schematic diagram illustrating a power feeding mechanism that feeds power to the first posture changing drive unit illustrated in FIG. 7. It is explanatory drawing explaining the attitude | position change operation | movement of a blade | wing. It is explanatory drawing explaining the attitude | position change operation | movement of a blade | wing. It is explanatory drawing explaining the attitude | position change operation | movement of a blade | wing. It is explanatory drawing explaining the attitude | position change operation | movement of a blade | wing. It is a partially-omission perspective view which shows the principal part structure of the cooling fan which concerns on 2nd Embodiment with the one part enlarged view. It is a partially-omission perspective view which shows the principal part structure of the cooling fan which concerns on 2nd Embodiment with the one part enlarged view. It is a typical plane sectional view showing the structure of the conventional electronic equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device 2 Case 3 Unit 11 Frame 15 Opening 19 Impeller 20 Base 21 Blade 22 Rotating shaft part 23 Posture changing shaft part 24 Guide hole 25 Posture holding guide part 30 First link member 30a With second link member 32 Force portion 40 First posture changing drive portion 50 Engaging member 51 Posture returning member 60 Motor 70 Power generation portion F Cooling fan

Claims (6)

A hollow cylindrical portion that is attached to a housing containing electronic components therein and blows air, a cylindrical base body in the cylindrical portion, and a central axis of the base body parallel to the central axis of the cylindrical portion A plurality of blades arranged on the peripheral surface of the base body, the impeller provided so that the posture can be changed between a wind raising posture for generating wind and a closed posture for substantially closing the cylindrical portion, and the impeller is rotated. A cooling fan that cools the electronic component by discharging a wind generated by the rotation of the impeller from the cylindrical portion.
A power generation unit that generates electric power by rotating the motor;
Posture changing means for changing each blade in the closed posture to a wake posture by the electric power supplied from the power generation unit;
A cooling fan comprising: posture returning means for returning each blade in a wind-up posture to a closed posture. At the base of each blade, a pivot shaft for changing the posture of the blade by rotation, and a posture change shaft for changing the posture of the blade by rotating around the rotation shaft. The part is protruding,
The posture changing means includes a first urging portion for urging the posture changing shaft portion so that the blades are rotated from a closed posture to a wind raising posture by a rotational force, and the first urging portion The cooling fan according to claim 1, further comprising a first link member that transmits an urging force to each of the posture changing shafts. At the base of each blade, a pivot shaft for changing the posture of the blade by rotation, and a posture change shaft for changing the posture of the blade by rotating around the rotation shaft. The part is protruding,
The posture changing means includes a second urging portion for urging the posture changing shaft portion so that the blades are rotated from the closed posture to the wind raising posture by electromagnetic force, and the second urging portion The cooling fan according to claim 1, further comprising a second link member that transmits an urging force to each of the posture changing shafts.   4. The posture returning means includes a first return biasing portion that biases the posture changing shaft portion so that the blades are rotated from a wind raising posture to a closed posture by elastic force. Cooling fan.   4. The posture returning means includes a second return urging portion that urges the posture changing shaft portion so that the blades are rotated from a wind raising posture to a closed posture by a magnetic force. Cooling fan. In an electronic device in which a plurality of axial-flow type cooling fans are provided in a housing in which electronic components are housed, and the electronic components are cooled by wind discharged from each cooling fan,
An electronic apparatus comprising the cooling fan according to claim 1.

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