JP4788409B2 - Cross current blower and electronic device - Google Patents

Description

The present invention relates to a crossflow fan that blows air in a direction substantially orthogonal to a rotation axis, an electronic device equipped with the blower, and an impeller mounted on the crossflow fan.

Conventionally, so-called cross-flow fans (cross-flow fans) that blow air in a direction substantially orthogonal to the rotating shaft of a motor are mainly used in air conditioners. Since the crossflow blower generates a planar airflow substantially parallel to the rotation axis of the motor, it may be used for an air curtain.

In such a cross flow blower, a rotating shaft of a motor is attached to one end of a fan body (impeller), and a rotating shaft coaxial with the rotating shaft of the motor is rotatable on a bearing on the side opposite to the rotating shaft of the fan body. (See, for example, Patent Documents 1 and 2). In such a general cross-flow blower, since the metal plate is assembled by metal, an unbalance of rotation of the fan main body is likely to occur. Therefore, as described in Patent Documents 1 and 2, the fan main body is supported by the bearings on both sides of the fan main body, so that the rotation can be stabilized.
Japanese Patent Laying-Open No. 2002-243193 (FIG. 4) Japanese Patent Laid-Open No. 11-141907 (FIG. 2)

  However, when bearings are provided on both sides of the fan body, the rotating shaft must be centered with high accuracy, and the manufacture of the cross-flow blower is not easy. In addition, since bearings are provided on both sides, there is a problem that the cost increases accordingly.

  In view of the circumstances as described above, it is an object of the present invention to provide a cross-flow blower, an electronic device, and the like that can facilitate manufacture and reduce manufacturing costs.

In order to achieve the above object, a cross-flow blower according to the present invention includes:
A plurality of blades arranged in an annular shape extending in a predetermined direction, an annular first connecting plate for connecting the blades on a first side in the predetermined direction, and the first side; A second connecting plate for connecting the blades on the second side opposite to the predetermined direction, wherein the blades are parallel to the direction of the rotation axis and are planar. A main surface and a second main surface that is provided on the opposite side of the first main surface, has an angle with respect to the first main surface, is parallel to the direction of the rotation axis, and is a plane. And an impeller made of integrally molded resin,
A motor mounted on the second connecting plate and provided along the predetermined direction, the motor driving the impeller,
A support that supports the motor so that the impeller is cantilevered by the rotating shaft;
A projecting member provided on the support so as to project from an outside of the impeller to an area surrounded by the blades through an inner side of the first connecting plate;
It comprises.
In addition, the electronic device according to the present invention is
A heating element;
The heating element and a housing incorporating the cross-flow fan are included.

  As described above, according to the present invention, it is possible to facilitate the manufacture of the crossflow fan and reduce the manufacturing cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an impeller mounted on a cross-flow blower according to a reference example . FIG. 2 is a cross-sectional view showing a cross-flow blower equipped with the impeller shown in FIG.

  The impeller 5 has a plurality of blades 1 extending in a predetermined direction. The blades 1 are connected by, for example, disk-shaped connecting members 2 and 3 so as to be arranged in a ring at substantially equal intervals. A boss portion 2a is provided at the center of the connecting member 2, and a rotating shaft 7 of a motor 6 is attached to the boss portion 2a. Each blade 1 is provided so as to extend along the axial direction (Y direction) of the rotary shaft 7.

  The motor 6 includes a stator 11 having a bearing 9 that rotatably supports the rotating shaft 7 and a coil 8 disposed around the bearing 9. The motor 6 includes a rotor 12 that is attached to the rotary shaft 7 and to which the magnet 4 is fixed.

  For example, a fluid bearing or a fluid dynamic pressure bearing is used as the bearing 9. That is, the bearing 9 is configured such that a sleeve member 15 having a dynamic pressure groove (not shown) is accommodated in the housing 14 in the housing 14. A fluid such as oil is filled between the sleeve member 15 and the rotary shaft 7. Alternatively, the sleeve member 15 may be made of a sintered metal and impregnated with oil. By using such a fluid dynamic pressure bearing, the rigidity of the rotating shaft 7 and the bearing 9 is increased, the shake of the rotating shaft 7 can be suppressed, and stable rotation can be realized. The bearing is not necessarily limited to a fluid bearing, and may be a ball bearing.

  The motor 6 is supported by a support body 16 so that the impeller 5 is cantilevered by the rotating shaft 7. Specifically, the motor 6 is fixed to the support 16 with, for example, a screw 13 or the like.

  In the cross-flow blower 10 configured as described above, when the impeller 5 rotates by driving the motor 6, a pressure difference is generated around each blade 1, and the air flows from the outside of the impeller 5 to the inside (individual ( The air is blown by moving to the outside of the blade 1 and exiting to the outside again. For example, the angle, shape, and the like of the main surface of each blade 1 are designed so that airflow that enters the inside from the outside of the impeller 5 is output to the outside again.

As described above, the cross-flow blower 10 has a configuration in which the rotating shaft 7 of the motor 6 supports the impeller 5 in a cantilevered manner, so that the impeller is supported by the bearings provided on both sides of the impeller. As a result of the reduction in the number of parts compared to this method, manufacturing is facilitated and manufacturing cost is also reduced.

In particular, it is very advantageous if the impeller 5 is made of resin. In this case, since the impeller 5 is reduced in weight, the unbalance amount is small, and the rotation of the impeller 5 is stabilized even if it is cantilevered. This reference example is also effective when the impeller 5 is small.

  When the impeller 5 is formed of resin, it can be manufactured by integral molding. When the impeller 5 is produced by integral molding, an impeller as shown in FIGS. 3 and 4 is produced. FIG. 3 is a cross-sectional view showing an impeller manufactured by integral molding, and FIG. 4 is a cross-sectional view taken along line AA in FIG. In FIG. 4, the arrow R is the direction of rotation.

  In the impeller 25, the first main surface 25d of each blade 25c and the second main surface 25e on the opposite side are flat. By forming the flat surface in this way, for example, when performing die cutting after molding with a die, the die divided by the number of blades 25c is linearly moved in the direction of arrow a as shown in FIG. It is because it can be pulled out. When the main surface of the blade 25c is curved as in the prior art, such die cutting is difficult. Of course, the connecting plates 25a and 25b connecting the blades 25c can be integrally formed with the blades 25c. A boss portion 25f through which the rotation shaft 7 of the motor 6 is inserted is formed at the center of the connecting plate 25a.

  As shown in FIG. 4, the second main surface 25e has an angle with respect to the first main surface 25d. The outer peripheral surface 25g and the inner peripheral surface 25h that connect the first main surface 25d and the second main surface 25e are formed in an arc shape (curved surface), for example, but may be formed in a flat surface. If the setting of the angle α formed by the first main surface 25d and the second main surface 25e is α> 0 °, the opening angle β of the blade 25c that is necessarily formed in the radial direction of the adjacent blade 25c is , Β <(360 ° / n). n is the number of blades 25c. For reference, when n = 12, α = 15 °, β = 15 °. When this is compared with an impeller having blades in which n = 12, α = 0 °, β = 30 °, that is, the first and second main surfaces are parallel, the generated air volume is improved by about 20%. It has been confirmed by experiments.

  Conventionally, an impeller is manufactured by attaching each of the blades 25c to the connecting plates on both sides. However, the entire impeller 25 is integrally formed to greatly simplify the manufacturing process. Is done. Furthermore, the integral molding improves the dimensional accuracy, shape accuracy, etc. of the impeller 25, so there is no need for subsequent manual processing, and the imbalance of the rotation of the impeller 25 is reduced, enabling stable rotation. Become. As a result of the stable rotation, the advantages of the cantilever structure described above are particularly exploited. That is, even a cantilever structure can be stably rotated.

  In addition, when the impeller 25 is integrally molded, even if the diameter (the diameter of the connecting plates 25a and 25b shown in FIG. 4) is 25 mm or less, it can be easily manufactured.

  FIG. 5 is a cross-sectional view showing a cross-flow blower according to another embodiment of the present invention. In the following description, the description of the members and functions of the cross-flow fan 10 according to the embodiment shown in FIG. 2 and the like will be simplified or omitted, and different points will be mainly described.

  The cross-flow blower 20 according to the present embodiment has an impeller on the side of the impeller 35 opposite to the side where the motor 6 is disposed (the side where the connecting plate 25a is provided) (the side where the connecting plate 35b is provided). The support mechanism 21 which supports 35 in a non-contact manner is provided. Specifically, the support mechanism 21 includes a pivot shaft 22 that is coaxial with the rotating shaft 7 of the motor 6 and is mounted on the impeller 35, and a magnet 23 that is disposed near the pivot shaft 22 and is fixed to the support body 26. Have. The pivot shaft 22 is attached to the boss portion 35d of the connecting plate 35b. The shape of the magnet 23 is not limited to the form shown in FIG. 5, and may be, for example, an annular shape that surrounds the pivot shaft 22 or an arc block shape that is a part of the annular shape. Reference numeral 35c is a blade.

  If the pivot shaft 22 is made of a magnetic material such as iron or nickel, a magnetic attraction force from the magnet 23 acts on the pivot shaft 22. As a result, a load is always applied in a non-contact state in the radial direction of the pivot shaft 22 (direction in the YZ plane), and vibration due to imbalance and a whirl phenomenon are suppressed.

FIG. 6 is a cross-sectional view showing a part of a cross-flow blower according to still another embodiment of the present invention. 7 is a cross-sectional view taken along line BB in FIG. A side plate 36 a provided with a projecting member 37 is provided on the support body of the crossflow fan 30. As shown in FIG. 6, the side plate 36 a may be a part of the support body 36 or a member fixed to the support body 36. For example, the protruding member 37 may be formed by cutting and raising from a sheet metal, or may be formed by molding. A hole 45d is formed in the connecting plate 45b of the impeller 45 opposite to the connecting plate 45a on the side where the motor 6 is disposed. The projecting member 37 projects from the outside of the impeller 45 into a region E (see FIG. 7) surrounded by each blade 45c through a hole 45d of the connecting plate 45b.

  6 and 7, a plurality of protruding members 37 are provided, but one may be provided. When there are a plurality of projecting members 37, the projecting members 37 may be provided annularly at equal intervals as shown in FIG. 7, but may not be equally spaced.

  As described above, according to the crossflow fan 30 according to the present embodiment, even if the posture of the crossflow fan 30 changes and the rotating shaft 7 is shaken, the protruding member 37 is the inner peripheral portion (hole) of the connecting plate 45b. Since it functions as a stopper in contact with 45d, the entire impeller 45 will not be shaken greatly.

  FIG. 8 is a cross-sectional view showing a part of a cross-flow blower according to still another embodiment of the present invention. A pressing member 41 that presses the pivot shaft 42 in the axial direction with a force F is attached to the support body 46 of the cross-flow fan 40. The pressing member 41 has a pivot seat surface 41a with which the tip 42a of the pivot shaft 42 comes into contact. The pressing member 41 is made of metal, resin, rubber, or the like.

  Compared to the conventional configuration in which bearings are provided on both sides of the impeller, the cross-flow blower 40 according to the present embodiment is provided with the pivot seat surface 41a with which the tip 42a of the pivot shaft 42 contacts as described above. It has only a simple structure. As a result, the impeller 35 can be stably rotated and can be easily manufactured and the manufacturing cost can be reduced.

  As a modification of the pressing member, a pressing member 43 having a curved pivot seat surface 43a, such as a cross-flow fan 50 shown in FIG. 9, is also conceivable. In this case, the curved surface may be a spherical surface, an elliptical surface, a hyperboloid, a paraboloid, or a combination thereof.

  FIG. 10 is a cross-sectional view showing an impeller according to still another embodiment of the present invention. The impeller 55 is an impeller provided with an engaging protrusion 55d and an engaging groove 55e. As shown in FIG. 11, for example, three engagement protrusions 55d are formed on the annular connecting plate 55b at intervals of 120 °. The engagement grooves 55e are formed in such a size that the engagement protrusions 55d can be fitted, and for example, three engagement grooves 55e are formed at intervals of 120 ° on the connection plate 55b. The angular interval between the adjacent engaging protrusion 55d and the engaging groove 55e is set to 60 °, for example. Further, the same engaging protrusion 55d and engaging groove 55e are formed on the connecting plate 55a opposite to the connecting plate 55b. Thereby, as shown in FIG. 11, the impeller 55 can be connected in multiple stages in the direction of the rotation axis, and an impeller (or blade) having a desired length can be realized.

  The arrangement of the engaging projections 55d and the engaging grooves 55e formed on the connecting plate 55b is compared with the arrangement of the engaging protrusions 55d and the engaging grooves 55e formed on the connecting plate 55a on the opposite side of the connecting plate 55b. , Shifted by an angle of 60 °. Thereby, a plurality of impellers 55 can be connected.

  FIG. 12 is a schematic cross-sectional view showing an electronic device in which any one of the above-described cross-flow blowers 10 and 20 is mounted. In FIG. 12, an FPD (Flat Panel Display) device such as a liquid crystal display is shown as the electronic device 100. In the FPD device 100, a housing 104 contains a fan 104, a cross-flow fan 10, a display panel 102 having a circuit board as a heating element, and other components 103 such as a power source. Heat generated from the display panel 102 is trapped in the housing 101. When the external air is sucked into the housing 101 by the fan 104 and the cross-flow fan 10 is operated, air containing heat can be discharged to the outside through, for example, an exhaust port 101 a formed in the housing 101. .

  Note that the length in the X direction of the crossflow fan 10 can be appropriately designed according to the length in the X direction, which is the horizontal direction of the housing 101 of the display 100 in FIG. In addition to liquid crystal displays, the concept of “display” includes plasma displays, plasma addressed liquid crystal displays, LED (Light Emitting Diode) displays, field emission displays (FEDs), and surface-conduction electron emitters (SEDs). Display)), EL (Electro-Luminescence) display (including both organic and inorganic), and the like.

  The present invention is not limited to the embodiment described above, and various modifications are possible.

  For example, the form which combined the form in which the non-contact support mechanism 21 shown in FIG. 5 is provided, and the form in which the protrusion member 37 shown in FIG.6 and FIG.7 is provided is also considered. Or the form which combined the form in which the protrusion member 37 shown in FIG.6 and FIG.7 is provided, and the form in which the press member 41 grade | etc., Shown in FIG.8 or FIG.9 is provided is also considered.

  Unless otherwise specified, the impeller 5 and the like shown in each of the above embodiments may be an impeller that is not integrally molded, or may be an impeller that is integrally molded.

  The electronic device illustrated in FIG. 12 is not limited to a display. For example, an air conditioner, a computer (for example, PC (Personal Computer), etc.), a projector, an audio / visual device, a game device, a car navigation device, a robot device, an air curtain device, and other electrical appliances may be used.

It is a perspective view which shows the impeller mounted in the crossflow air blower based on a reference example . It is sectional drawing which shows the crossflow air blower which mounts the impeller shown in FIG. It is sectional drawing which shows the impeller produced by integral molding. It is the sectional view on the AA line in FIG. It is sectional drawing which shows the crossflow ventilation apparatus which concerns on other embodiment of this invention. It is sectional drawing which shows a part of crossflow fan apparatus which concerns on another embodiment of this invention. It is the BB sectional view taken on the line in FIG. It is sectional drawing which shows a part of crossflow fan apparatus which concerns on another embodiment of this invention. It is sectional drawing which shows the modification of the crossflow air blower shown in FIG. It is sectional drawing which shows the impeller which concerns on another embodiment of this invention. It is a perspective view which shows a mode that the impeller shown in FIG. 10 is connected. It is typical sectional drawing which shows a thin display, for example as an electronic device by which the crossflow ventilation apparatus which concerns on each said embodiment is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 25c, 35c, 45c, 55c ... Blade 2 ... Connecting member 2a ... Boss part 5, 25, 35, 45, 55 ... Impeller 6 ... Motor 7 ... Rotating shaft 9 ... Bearing 10, 20, 30, 40, 50 ... Cross-flow fan 21 ... Support mechanism 22, 42 ... Pivot shaft 23 ... Magnet 25d ... First main surface 25e ... Second main surface 25a ... Connecting plate 26 ... Support body 37 ... Protruding member 41 ... Pressing member 41a, 43a ... Pivot seat surface 42a ... Tip 55d ... engagement protrusion 55e ... engagement groove 100 ... FPD device (electronic device)
101 ... Case

Claims (9)

A plurality of blades arranged in an annular shape extending in a predetermined direction, an annular first connecting plate for connecting the blades on a first side in the predetermined direction, and the first side; A second connecting plate for connecting the blades on the second side opposite to the predetermined direction, wherein the blades are parallel to the direction of the rotation axis and are planar. A main surface and a second main surface that is provided on the opposite side of the first main surface, has an angle with respect to the first main surface, is parallel to the direction of the rotation axis, and is a plane. And an impeller made of integrally molded resin ,
A motor mounted on the second connecting plate and provided along the predetermined direction, the motor driving the impeller,
A support that supports the motor so that the impeller is cantilevered by the rotating shaft ;
A cross-flow blower comprising: a projecting member provided on the support so as to project from an outside of the impeller to an area surrounded by the blades through an inside of the first connecting plate . The cross-flow blower according to claim 1,
The motor has a fluid bearing that supports the rotating shaft. The cross-flow blower according to claim 1,
A cross-flow air blower further comprising a support mechanism that is disposed on the first side of the impeller and supports the impeller in a non-contact manner. It is a crossflow fan apparatus of Claim 3 , Comprising:
The support mechanism is
A shaft member made of a magnetic body coaxially with the rotating shaft and mounted on the impeller;
A crossflow blower comprising: a magnet provided on the support and disposed in the vicinity of the shaft member. It is a crossflow air blower of any 1 paragraph among Claims 1-4 ,
The impeller is
A cross-flow blower having an engaging portion for connecting a plurality of the impellers in the predetermined direction. It is a crossflow air blower of any 1 paragraph among Claims 1-5 ,
A pivot shaft mounted on the first side of the impeller coaxially with the rotating shaft of the motor and provided along the predetermined direction ;
The support is, cross flow blower which have a pivot bearing surface in contact with the distal end of the pivot shaft. It is a crossflow fan apparatus of Claim 6 , Comprising:
The pivot seat is a flat crossflow fan. It is a crossflow fan apparatus of Claim 6 , Comprising:
The pivot bearing surface is a curved crossflow fan. A heating element;
A cross-flow blower;
A housing containing the heating element and the cross-flow blower ;
The cross-flow blower is
A plurality of blades arranged in an annular shape extending in a predetermined direction, an annular first connecting plate for connecting the blades on a first side in the predetermined direction, and the first side; A second connecting plate for connecting the blades on the second side opposite to the predetermined direction, wherein the blades are parallel to the direction of the rotation axis and are planar. A main surface and a second main surface that is provided on the opposite side of the first main surface, has an angle with respect to the first main surface, is parallel to the direction of the rotation axis, and is a plane. And an impeller made of integrally molded resin ,
A motor mounted on the second connecting plate and provided along the predetermined direction, the motor driving the impeller,
A support that supports the motor so that the impeller is cantilevered by the rotating shaft ;
An electronic device comprising: a projecting member provided on the support body so as to project from an outer side of the impeller to an area surrounded by the blades through an inner side of the first connecting plate .

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