JP6287579B2 - Cross flow fan, electronic equipment - Google Patents

Description

  The present invention relates to a crossflow fan and an electronic device including the crossflow fan.

  In an electronic device, cooling may be performed using a cross flow fan for the purpose of suppressing an increase in internal temperature. In this type of crossflow fan, both ends of a shaft are rotatably supported by bearings, and are driven to rotate by a motor connected to one end of the shaft (for example, see Patent Document 1).

JP 2001-274486 A

  By the way, when assembling this type of crossflow fan, in addition to the step of fixing the both ends of the shaft of the crossflow fan to the bearing, a step of connecting the drive shaft of the motor and the shaft of the crossflow fan with a connecting member is required. is there. Further, in order to realize a vibration isolating function that suppresses vibrations of the cross flow fan, for example, a process of arranging a vibration isolating rubber or the like between the bearing and the housing is also necessary.

  The objective of this invention is providing the electronic device provided with the crossflow fan which can reduce an assembly man-hour, implement | achieving a vibration-proof function, and the said crossflow fan.

  A cross flow fan according to one aspect of the present invention includes a shaft, a plurality of impellers, a first connecting portion, and a second connecting portion. The impeller includes an opening through which the shaft is inserted, a first fitting portion that is provided at a first end and a second end in the axial direction of the shaft and can be fitted to each other, and the first end And a blade portion provided between the second end portions. The first connecting portion is provided coaxially on the front and back surfaces with a first insertion portion into which a drive shaft to which a driving force is transmitted is inserted and a second insertion portion into which the shaft is inserted. Further, the first connecting part has elasticity. The second connecting portion is a second fitting portion that can be fitted to the first fitting portion of the second end portion of the impeller located at one end in the axial direction of the shaft among the plurality of impellers. And a coupling part to which the first coupling part is coupled.

  An electronic apparatus according to another aspect of the present invention includes the cross flow fan and a drive unit that rotates the drive shaft.

  ADVANTAGE OF THE INVENTION According to this invention, the crossflow fan and electronic device which can reduce an assembly man-hour while implement | achieving a vibration isolating function are implement | achieved.

FIG. 1 is a diagram showing a configuration of an electronic device according to an embodiment of the present invention. FIG. 2 is a block diagram showing a system configuration of the electronic device according to the embodiment of the present invention. FIG. 3 is a diagram showing the configuration of the crossflow fan according to the embodiment of the present invention. FIG. 4 is a perspective view of the impeller of the crossflow fan according to the embodiment of the present invention. FIG. 5 is a perspective view of the impeller of the crossflow fan according to the embodiment of the present invention. FIG. 6 is a side view of the impeller of the crossflow fan according to the embodiment of the present invention. FIG. 7 is a view showing the surface of the connecting portion of the crossflow fan according to the embodiment of the present invention. FIG. 8 is a view showing the back surface of the connecting portion of the crossflow fan according to the embodiment of the present invention. 9 is a cross-sectional view taken along arrow IX-IX in FIG. FIG. 10 is a cross-sectional view for explaining the bearing portion of the crossflow fan according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

[Schematic Configuration of Electronic Device 10]
First, a schematic configuration of an electronic device 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing an internal configuration of the electronic device 10.

  As shown in FIGS. 1 and 2, the electronic device 10 includes a composite including an ADF 1, an image reading unit 2, an image forming unit 3, a paper feeding unit 4, a control unit 5, an operation display unit 6, and a cooling unit 7. Machine. The present invention can also be applied to electronic devices such as image reading apparatuses or image forming apparatuses such as scanners, printers, facsimile apparatuses, and copiers. The present invention is also applicable to various electronic devices such as an air conditioner, a refrigerator, and a microwave oven.

  The ADF 1 is an automatic document conveying device including a document setting unit 11, a plurality of conveyance rollers 12, a document pressing unit 13, and a paper discharge unit 14. The image reading unit 2 includes a document table 21, a reading unit 22, a mirror 23, a mirror 24, an optical lens 25, and a CCD (Charge Coupled Device) 26. The image forming unit 3 is an electrophotographic image forming unit capable of executing an image forming process (printing process) for forming an image based on the image data read by the image reading unit 2. Specifically, the image forming unit 3 includes a photosensitive drum 31, a charging device 32, an optical scanning device (LSU) 33, a developing device 34, a toner container 34A, a transfer roller 35, a cleaning device 36, a fixing roller 37, a pressure roller. A roller 38 and a paper discharge tray 39 are provided.

  The control unit 5 includes control devices such as a CPU, ROM, RAM, and EEPROM (not shown). The operation display unit 6 is a display unit such as a liquid crystal panel that displays various types of information according to control instructions from the control unit 5 and an operation that inputs various types of information to the control unit 5 according to user operations. An operation unit such as a key or a touch panel is provided.

  As shown in FIG. 1, the cooling unit 7 is provided on the downstream side of the fixing roller 37 in the sheet conveyance path of the image forming unit 3, and realizes a cooling function by blowing air inside the electronic device 10. . Specifically, as shown in FIGS. 1 and 2, the cooling unit 7 includes a driving unit 71 and a cross flow fan 72. The driving unit 71 includes a driving source such as a motor that generates a driving force necessary for the rotation of the cross flow fan 72. The cross flow fan 72 is a fan that sucks air in a direction perpendicular to the axial direction and blows air in a direction perpendicular to the axial direction. Specifically, in the electronic device 10, the cross flow fan 72 is rotationally driven by the driving force transmitted from the driving unit 71 and blows air toward the sheet conveyance path of the image forming unit 3. The sheet after passing through the fixing roller 37 is cooled. In addition, when the electronic device 10 is an air conditioner, for example, the cross flow fan 72 of the cooling unit 7 blows air from the air outlet of the air conditioner to the outside.

  By the way, a cross flow fan such as the cross flow fan 72 may be rotatably driven by a motor connected to one end of the shaft, with both ends of the shaft rotatably supported by bearings. When assembling this type of crossflow fan, in addition to the step of fixing both ends of the shaft of the crossflow fan to the bearing, a step of connecting the drive shaft of the motor and the shaft of the crossflow fan with a connecting member is required. Further, in order to realize a vibration isolating function that suppresses vibrations of the cross flow fan, for example, a process of arranging a vibration isolating rubber or the like between the bearing and the housing is also necessary. On the other hand, in the cross flow fan 72 provided in the electronic device 10, as will be described later, the assembly man-hour is reduced while realizing a vibration isolation function.

  Hereinafter, the cross flow fan 71 will be described with reference to FIGS. In the following description, for convenience of explanation, description may be made using the vertical direction and the horizontal direction defined in each drawing.

  As shown in FIG. 3, the cross flow fan 72 includes a shaft 73, a plurality of impellers 74, a connecting portion 75, and a locking portion 76. A plurality of the impellers 74 are fitted on the shaft 73, and the plurality of impellers 74 are connected along the axial direction. Each of the impellers 74 is a fan that blows air sucked from a direction perpendicular to the axial direction in a direction perpendicular to the axial direction. The number of the impellers 74 included in the cross flow fan 72 can be appropriately changed in consideration of a necessary air blowing range.

  The connecting portion 75 and the locking portion 76 are provided at both ends of the plurality of connected impellers 74 and restrict the axial movement of the impeller 74 in the shaft 73. As shown in FIG. 3, the connecting portion 75 is connected to a drive shaft 71 </ b> A that transmits the driving force from the drive portion 71. The end of the shaft 73 on the drive shaft 71A side is rotatably supported by the drive shaft 71A via the connecting portion 775. An end portion of the shaft 73 opposite to the drive shaft 71A is rotatably supported by a bearing portion 77 (see FIG. 10) described later. The cross flow fan 72 is rotated by the power transmitted from the drive unit 71 via the drive shaft 71A and blows air in a direction perpendicular to the axial direction.

  More specifically, as shown in FIGS. 4 and 5, the impeller 74 has a first end portion 742 in the right direction as a bottom portion and a second end portion 744 in the left direction as an open end portion. It is formed in a bottom cylindrical shape. The impeller 74 is integrally formed of resin or the like.

  As shown in FIG. 4, the first end portion 742 has an opening 741 and a plurality of convex portions 743 and is formed in a disc shape. Further, as shown in FIG. 5, the second end 744 has a plurality of recesses 745 and is formed in an annular shape. As shown in FIGS. 4 and 5, a blade portion 746 is provided between the first end portion 742 and the second end portion 744.

  As shown in FIG. 4, the opening 741 is an opening formed at a position corresponding to the axial center of the impeller 74 at the first end 742 and through which the shaft 73 can be inserted. The shaft 73 is inserted into the opening 741 of each impeller 74 to move the impeller 74 in a direction perpendicular to the axial direction when the cross flow fan 72 rotates. regulate.

  Here, in the impeller 74, the outer peripheral surface of the first end portion 742 and the inner peripheral surface of the second end portion 744 are formed to be able to fit in the axial direction. Thereby, the movement of each impeller 74 in the direction perpendicular to the axial direction when the cross flow fan 72 rotates is also restricted by the adjacent impeller 74. That is, in the cross flow fan 72, the cross flow is achieved by inserting the shaft 73 into the opening 741 and fitting the outer peripheral surface of the first end 742 and the inner peripheral surface of the second end 744. When the fan 72 rotates, the impeller 74 is restricted from moving in the direction perpendicular to the axial direction. A configuration in which the outer peripheral surface of the first end 742 is not fitted to the inner peripheral surface of the second end 744 is also conceivable as another embodiment.

  The convex portion 743 is formed on the outer peripheral surface of the first end portion 742 and protrudes in a direction perpendicular to the axial direction. Specifically, as shown in FIGS. 4 and 6, the convex portions 743 are formed on the outer peripheral surface of the first end portion 742 at equal intervals along the rotational direction of the impeller 74.

  On the other hand, the concave portion 745 is formed on the inner peripheral surface of the second end portion 744 and can be fitted to the convex portion 743. Specifically, as shown in FIG. 5, the recesses 745 are formed at equal intervals along the rotation direction of the impeller 74 on the inner peripheral surface of the second end 744. In the cross flow fan 72, the plurality of impellers 74 are connected in the axial direction so as to be integrally rotatable by fitting the convex portions 743 and the concave portions 745. Here, the convex portion 743 and the concave portion 745 are an example of a first fitting portion in the present invention, and in particular, the concave portion 745 is an example of a first fitting portion connected to the connecting portion 75. .

  As shown in FIGS. 4 and 5, the blade portion 746 has a plurality of blades that are long in the axial direction and arranged in an annular shape along the rotation direction of the impeller 74. In the impeller 74, the plurality of blades of the blade portion 746 extend in parallel to the axial direction from the second end portion 744 and are connected to the outer peripheral surface of the first end portion 742.

  Incidentally, as shown in FIG. 6, the convex portion 743 is provided between adjacent blades on the outer peripheral surface of the first end portion 742. Furthermore, the convex part 743 and the concave part 745 are provided at positions facing the axial direction. In other words, the shape of the impeller 74 is configured such that the die used for molding the impeller 74 has only one direction. Thereby, the process by a slide core becomes unnecessary at the time of shaping | molding of the said impeller 74 using a metal mold | die, and the manufacturing cost of the said impeller 74 can be suppressed.

  As described above, the connecting portion 75 connects the shaft 73 and the drive shaft 71A, and fits into the concave portion 745 formed in the second end portion 744 of the impeller 74 so as to fit the impeller 74. Are connected to the drive shaft 71A and the shaft 73. Specifically, the connecting portion 75 includes a first connecting portion 751 and a second connecting portion 752 as shown in FIGS.

  As shown in FIGS. 7 to 9, the first connecting portion 751 has a first insertion portion 755 into which the drive shaft 71A is inserted and a second insertion portion 756 into which the shaft 73 is inserted on the front and back surfaces. It is provided on the same axis. Here, the first connecting portion 751 is formed of an elastic material such as synthetic resin (rubber) having elasticity. Therefore, the first connecting portion 751 can realize a vibration isolating function that suppresses transmission of vibration of the impeller 74 to the drive shaft 71 </ b> A when the cross flow fan 72 rotates.

  As shown in FIGS. 7 and 9, the first insertion portion 755 is a trapezoidal section having a recess 755 </ b> A and an inclined surface 755 </ b> B. The recess 755A is a columnar insertion space formed along the insertion direction R1 of the drive shaft 71A, and has an inner diameter smaller than the outer diameter of the drive shaft 71A. The drive shaft 71A is fitted into the recess 755A by being press-fitted into the recess 755A. It is also conceivable that the drive shaft 71A is fitted in the recess 755A.

  The inclined surface 755B is an outer peripheral surface of the first insertion portion 755, and is inclined in a direction in which the outer diameter gradually increases toward the insertion direction R1 of the drive shaft 71A. That is, in the first insertion portion 755, the thickness of the portion forming the recess 755A gradually increases along the insertion direction R1 of the drive shaft 71A.

  As a result, in the cross flow fan 72, the pressure acting on the drive shaft 71A from the recess 755A at the tip of the drive shaft 71A in the fitting direction R1 increases. Therefore, the impeller 74 rotates around the tip of the drive shaft 71A in the insertion direction R1, and the vibration of the drive shaft 71A can be suppressed. Further, since the thickness of the first insertion portion 755 at the entrance of the recess 755A is thinner than that of the bottom of the recess 755A, the operation of press-fitting the drive shaft 71A into the recess 755A is easily performed. be able to.

  Similarly, as shown in FIGS. 8 and 9, the second insertion portion 756 is a trapezoidal section having a recess 756A and an inclined surface 756B. The recess 756A is a columnar insertion space formed along the insertion direction R2 of the shaft 73, and has an inner diameter smaller than the outer diameter of the shaft 73. The shaft 73 is fitted into the recess 756A by being press-fitted into the recess 756A. It is also conceivable that the shaft 73 is fitted into the recess 756A.

  The inclined surface 756B is an outer peripheral surface of the second insertion portion 756, and is inclined in a direction in which the outer diameter gradually increases toward the insertion direction R2 of the shaft 73. That is, in the second insertion portion 756, the thickness of the portion where the recess 756A is formed gradually increases along the insertion direction R2 of the shaft 73.

  Thereby, in the cross flow fan 72, the pressure acting on the shaft 73 from the recess 756A at the tip of the shaft 63 in the insertion direction R2 is increased. Therefore, it is possible to suppress the shake of the shaft 73 when the impeller 74 rotates. In addition, since the thickness of the second insertion portion 756 at the entrance of the recess 756A is thinner than the bottom of the recess 756A, the operation of press-fitting the shaft 73 into the recess 756A can be easily performed. Can do.

  On the other hand, as shown in FIGS. 8 and 9, the second connecting portion 752 includes a convex portion 754 (an example of a second fitting portion) and a coupling portion 753. The convex portion 754 can be fitted into the concave portion 745 of the second end portion 744 of the impeller 74 located at the left end portion in the axial direction of the shaft 3 among the plurality of impellers 74. Thus, the shape of the second end 744 of the impeller 74 can be used to fix the impeller 74 to the shaft 73, and the position of the cross flow fan 72 at the end in the axial direction can be increased. There is no need to change the shape of the impeller 74 to a shape suitable for fixing to the shaft 73. That is, the same member can be used for all the impellers 74 constituting the cross flow fan 72. If the second connecting portion 752 and the impeller 74 can be fitted to each other, the second connecting portion 752 has a concave portion instead of the convex portion 754, and the impeller 74 has the concave portion. It is also conceivable that the second end portion 744 has a convex portion instead of the concave portion 745.

  The coupling portion 753 has a recess that is recessed toward the insertion direction R1 of the drive shaft 71A. Then, when the second fitting insertion portion 756 is press-fitted or fitted into the coupling portion 753, the first coupling portion 751 and the second coupling portion 752 are coupled and integrated. Here, in the coupling portion 753, as shown in FIG. 9, the concave portion of the coupling portion 753 has an inclined surface 753A whose outer diameter gradually increases toward the fitting insertion direction R2 of the shaft 73. . Further, as described above, the inclined surface 756 </ b> B whose outer diameter gradually increases toward the insertion direction R <b> 2 of the shaft 73 is provided on the outer periphery of the second insertion portion 756. Accordingly, the operation of press-fitting the second fitting insertion portion 756 into the coupling portion 753 can be easily performed, and a wide contact area between the second fitting insertion portion 756 and the coupling portion 753 can be ensured. .

  The locking portion 76 can be attached to the shaft 73 and locks the movement of the impeller 74 in the axial direction. For example, the locking portion 76 is a C-ring that can be attached to the shaft 73. As shown in FIGS. 3 and 10, the locking portion 76 is provided at the right end of the crossflow fan 72 and locks the movement of each impeller 74 in the right direction. Thereby, the movement in the axial direction of each of the plurality of impellers 74 connected in the axial direction is restricted between the connecting portion 75 and the locking portion 76. Thus, in the cross flow fan 72, it is not necessary to fix each of the impellers 74 to the shaft 73, and it is possible to suppress time spent in the assembly process.

  The bearing 77 supports the second end 732 of the shaft 73 in a rotatable manner. Specifically, as shown in FIG. 10, the bearing portion 77 includes a bearing 771 supported by a frame of the casing of the electronic device 10, a shaft support member 772 rotatably supported by the bearing 771, The elastic member 773 is press-fitted into the shaft support member 772. The second end 732 of the shaft 73 is rotatably supported by the bearing 771 by being press-fitted into the elastic member 773.

  As described above, in the cross flow fan 72 included in the electronic device 10, the drive shaft 71A and the shaft 73 are connected to each other by the first connecting portion 751 and the second connecting portion 752 having elasticity. In addition, the drive shaft 71 </ b> A and the shaft 73 are connected to the impeller 74. Therefore, according to the cross flow fan 72, the number of assembling steps can be reduced while realizing the vibration isolation function. In the cross flow fan 72, the impeller 74 is fixed to the shaft 73 by the connecting portion 75, and the drive shaft 71A and the shaft 73 are connected. Therefore, for example, it is not necessary to separately provide a mechanism for connecting the shaft 73 and the drive shaft 71A in the axial direction, and simplification of constituent members of the cooling unit 7 and space saving in the axial direction are possible.

71A: Drive shaft 72: Cross flow fan 73: Shaft 74: Impeller 741: Opening part 742: First end 743: Convex part 744: Second end part 745: Concave part 746: Blade part 75: Connecting part 751: No. 1 connecting portion 755: first fitting insertion portion 755A: recessed portion 755B: inclined surface 756: second fitting insertion portion 756A: recessed portion 756B: inclined surface 752: second connecting portion 76: locking portion 77: bearing portion 10: image formation apparatus

Claims (5)

A shaft,
An opening through which the shaft is inserted, a first fitting portion that is provided at a first end portion and a second end portion in the axial direction of the shaft and can be fitted to each other, and the first end portion and the second end A plurality of impellers having blade portions provided between the portions;
A first coupling portion in which a driving shaft to which a driving force is transmitted is fitted and a second fitting insertion portion in which the shaft is fitted are provided coaxially on the front and back surfaces, and an elastic first coupling portion;
A second fitting portion that can be fitted to the first fitting portion at the second end portion of the impeller located at one end in the axial direction of the shaft among the plurality of impellers, and the first connecting portion. A second connecting part including a connecting part to which
Equipped with a,
A cross flow fan in which an outer peripheral surface of the first insertion portion has an inclined surface whose outer diameter increases toward the insertion direction of the drive shaft . 2. The crossflow fan according to claim 1, wherein one of the first fitting portion of the second end portion and the second fitting portion of the second connecting portion is a convex portion and the other is a concave portion. The coupling portion has a recess that is recessed toward the insertion direction of the drive shaft;
The crossflow fan according to claim 1 or 2, wherein the second insertion portion of the first connecting portion is press-fitted or fitted into the recess.   A shaft,
  An opening through which the shaft is inserted, a first fitting portion that is provided at a first end portion and a second end portion in the axial direction of the shaft and can be fitted to each other, and the first end portion and the second end A plurality of impellers having blade portions provided between the portions;
  A first coupling portion in which a driving shaft to which a driving force is transmitted is fitted and a second fitting insertion portion in which the shaft is fitted are provided coaxially on the front and back surfaces, and an elastic first coupling portion;
  A second fitting portion that can be fitted to the first fitting portion at the second end portion of the impeller located at one end in the axial direction of the shaft among the plurality of impellers, and the first connecting portion. A second connecting part including a connecting part to which
  With
  The coupling portion has a recess that is recessed toward the insertion direction of the drive shaft;
  The second fitting insertion portion of the first connecting portion is press-fitted or fitted into the recess,
  The concave portion of the coupling portion has an inclined surface with an outer diameter increasing toward the fitting insertion direction of the shaft inside,
  The cross flow fan in which the second insertion portion of the first connecting portion has an inclined surface whose outer diameter increases toward the insertion direction of the shaft. A cross flow fan according to any one of claims 1-4, an electronic device and a drive unit for rotating the drive shaft.

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