JP2001140790A - Small diversion fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small diversion fan to insure the flow passage of a suction port, improve performance by reducing a load on a blade, reduce the generation of noise, and in addition, effectively function improvement of performance even in a case of a two-suction type. SOLUTION: A shaft 7 is fixed at the central part of a rotor 1 and a magnet 3 is contained inside a column part 6. The peripheral surface of the column part 6 is filled with ribs 5a, 5b, 5c, and 5d. A ring-form disc part 4 on which a number of blades 2 are mounted is attached to the tips of the ribs 5a, 5b, 5c, and 5d. A gap 8 is provided between the disc part 4 on which the blades are loaded and the column part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small cross-flow fan having blower blades for blowing sucked air in a direction substantially perpendicular to an axis.

[0002]

2. Description of the Related Art Small cross-flow fans are mounted on OA equipment and personal computers, which are becoming smaller and thinner, and are used to individually cool the entire apparatus and components that generate a large amount of heat. 10 and 11 are views for explaining a conventional example of a small cross-flow fan. FIG. 10 is a perspective view of a blade structure.
FIG. 11 is a partial sectional view in which a blade structure is incorporated in a case. The conventional blade structure has a cylindrical portion 51 of the rotor casing.
The disk part 52 is attached to the disk part 52, and a large number of blades 50 are provided on the upper surface of the disk part 52. The blade 50 extends substantially radially from the surface of the column 51.

[0003] A shaft 48 of the rotor casing is inserted into a bearing attached to a stator (not shown). A magnetic circuit is formed by the magnet 49 housed in the rotor casing, the coil and the yoke on the stator side, and the rotor is driven to rotate. Air is sucked from the suction port 54 on the upper surface of the case 53 and discharged from the side of the case.

[0004]

The blade structure of the conventional small cross-flow fan is such that, when the blades are observed from the suction port, if the number of blades is increased, the width (thickness) of the blades causes the flow path of the suction port around the casing to increase. Becomes narrower and closed. For this reason, there is a problem that the load in the air passage increases and the air volume cannot be increased beyond a certain level. Since small cross-flow fans have low torque, there is a demand to reduce the load on the blades as much as possible. Further, since the blades extend from the casing of the rotor, there is a problem in that the blades near the suction port become a load and increase noise.

FIG. 12 is a view for explaining another conventional example of a blade structure of a small horizontal fan. This example is shown in FIG.
Unlike the conventional example of No. 0, the blade structure does not have a disk portion. The structure is such that the blades 56 are planted on the side surfaces of the rotor 55. Since there is no disk portion, there is a drawback that interference easily occurs in the flow path.

An object of the present invention is to secure a flow path of a suction port,
It is an object of the present invention to provide a small cross-flow fan that improves the performance by reducing the load on the blades and reduces the noise while also effectively increasing the performance in the case of the double suction type.

[0007]

In order to achieve the above object, a small cross-flow fan according to the present invention has a small size having a blower blade configured to blow air sucked from a substantially axial direction in a direction substantially perpendicular to an axis. In the cross flow fan, a wing portion formed by forming a plurality of blades on a ring-shaped disk portion is supported by a plurality of ribs implanted in the rotor casing portion, and a flow is provided between the rotor casing portion and the wing portion. A gap that forms a path is formed. Further, according to the present invention, in the above configuration, the ring-shaped disk portion is mounted on an extension of a rib, and the ring-shaped disk portion is mounted within a range of the height of the blade. Further, according to the present invention, in the above-described configuration, the blade extending substantially in the radial direction is set at a position such that a part thereof in the radial direction coincides with the periphery of the suction port of the case accommodating the rotor. Further, in the above configuration, the present invention is configured such that a length of the blade extending substantially in the radial direction is larger than a width of the ring-shaped disk portion. Further, in the above configuration, the present invention is configured such that the fan case can be sucked from both sides. Next, according to the present invention, in the above configuration, the fin of the heat sink is provided at the outlet of the fan.

[0008]

According to the above construction, the load on the blade is reduced and the air volume is increased. In addition, the noise is reduced, and it works effectively for both suction type fans.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a blade structure in a small horizontal fan according to the present invention. A shaft 7 is fixed to the center of the rotor 1,
The magnet 3 is housed inside the column 6. Ribs 5a, 5b, 5c and 5d are implanted on the circumferential surface of the cylindrical portion 6. At the tips of the ribs 5a, 5b, 5c and 5d, a ring-shaped disk portion 4 provided with a large number of blades 2 is attached. The ribs are shaped such that the resistance of air is reduced when the rotor rotates, and the number of ribs is such that the strength for supporting the wing portion composed of the blade 2 and the disk portion 4 can be secured. A gap 8 is formed between the wing and the column 6.

FIG. 2 is a view showing an example in which the mounting positions of the disk portion and the rib with respect to the blade are changed in the small horizontal fan according to the present invention. In (a), a rib 11a is attached to the lowermost portion of the rotor peripheral edge, and a disk portion 10a is fixed to the tip of the rib 11a. The disk part 10a is attached to the lowest part of the height h of the blade 9a. In (b), a rib 11b is attached to an intermediate portion of the rotor periphery, and a disk portion 10b is fixed to a tip of the rib 11b. The disk portion 10b is mounted at an intermediate position of the height h of the blade 9b. In (c), a rib 11c is attached to the uppermost part of the rotor periphery, and a disk portion 10c is fixed to the tip of the rib 11c. The disk part 10c is attached to the uppermost part of the height h of the blade 9c.

FIG. 3 is a view showing an example in which the positional relationship between the suction aperture and the blades is changed in the small horizontal fan according to the present invention. (A) shows the state of the suction port 13a such that the rearmost position of the blade 14a coincides with the peripheral edge position of the suction port 13a of the case 12a.
Is set. In (b), the radius of the suction port 13b is set so that the middle position of the blade 14b and the peripheral position of the suction port 13b of the case 12b match. (C) shows the state of the suction port 13c so that the position of the tip of the blade 14c and the peripheral position of the suction port 13c of the case 12c coincide.
Is set. The most suitable characteristics can be obtained by changing the mounting position of the blade as shown in FIG. 2 and the size of the suction port with respect to the blade as shown in FIG.

FIG. 4 is a view showing an example in which the length of the blade is made larger than the width of the disk portion in the small horizontal fan according to the present invention. The length of the blade 18 in the radial direction is made larger than the width of the disk portion 17 to increase the area of the blade. By increasing the area of the blade, the air volume can be further increased as compared with the type of FIG.

FIG. 5 is a cross-sectional view showing an example in which the small cross-flow fan according to the present invention is applied to a double-sided suction case. A suction port 1) 23a and a suction port 2) 23b are provided on the upper surface and the lower surface of the case 22, respectively, so that air is taken in from both sides of the case. The air taken in from each inlet is
It is discharged from the outlet 24 provided on the side surface. The amount of air to be taken in smoothly from both suction ports increases, and stable suction can be performed by the ring-shaped disc portion. The blade structure according to the present invention functions particularly effectively for a fan of both suction types.

FIG. 6 is a sectional view showing an example of application to a heat sink fan. The case 20 is constituted by a heat sink 28, and a rotor 30 having a blade structure according to the present invention is incorporated in the heat sink. The yoke 32 and the magnet 33 are built in the rotor 30, and the stator 21 is arranged on the suction port 29 side. The air flow flowing from the suction port 29 can flow smoothly to the bottom surface side of the heat sink 28 from the gap 30 a of the rotor 30. The air flowing into the heat sink has a stable flow due to the ring-shaped disk portion, and is discharged from the outlet provided with the fins 28a and 28b. Since the amount of air reaching the bottom side increases, the cooling capacity is further improved as compared with the conventional case.

FIG. 7 is a view showing an example in which the size of the upper blade portion and the lower blade portion is changed in the small horizontal fan according to the present invention. (A) is that the length of the upper blade portion 34a on the upper side of the disk portion 36a is shorter than the length of the lower blade portion 35a on the lower side. (B)
Is opposite to (a), the upper blade portion 34 above the disk portion 36b.
The length of b is longer than that of the lower lower blade portion 35b. In the case of a double-sided blade, the lengths of the upper blade portion and the lower blade portion can be changed as necessary in this way, and the dimensions can be such that the increase in air volume is optimal.

FIG. 8 is a cross-sectional view showing another embodiment of the small horizontal fan according to the present invention, in which the configuration of the rotor base for housing the magnet is upside down. Stator 3
Numeral 9 is provided on the bottom surface of the case 46 on the side opposite to the suction port 42 side. The casing of the rotor 38 has a concave shape on the side facing the stator 39, and a magnet 40 is mounted therein. The structures of the rib 45, the ring-shaped disk portion 44, and the blades 41 attached to the peripheral surface of the casing of the rotor 38 are the same as those in FIG.

FIG. 9 is a sectional view showing still another embodiment of a small cross-flow fan according to the present invention, in which an outer rotor type fan is applied to a heat sink. A stator 55 is provided on a heat sink 60 on the bottom surface, and a yoke 56 and a magnet 57 are built in a rotor 61. The blade structure is such that blades 63 of the same shape are planted on the upper and lower surfaces of the disk portion 62 as shown in FIG. The air sucked in from the suction ports from the bottom side and the top side can smoothly flow in by providing the gap portion 61a to reduce the load on the blades, and can be discharged from the air outlet provided with the heat sink fins 59 on the side surfaces. Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made.

[0018]

As described above, according to the present invention, a ring-shaped disk portion is provided in a small cross-flow fan having a blower blade configured to blow air sucked from a substantially axial direction in a direction substantially perpendicular to the axis. A plurality of ribs formed on the rotor casing portion, and a plurality of ribs formed on the rotor casing portion are supported to form a gap serving as a flow path between the rotor casing portion and the wing portion. Therefore, since the flow path of the suction port is secured, the air volume is increased, and the performance of the fan can be improved. Further, the load generated by the blades is reduced, and noise generation can be reduced. Furthermore, when applied to a heat sink fan, there is an effect that the wind can smoothly flow into the bottom surface side of the heat sink and the cooling capacity can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a blade structure in a small horizontal fan according to the present invention.

FIG. 2 is a view showing an example in which the mounting positions of the disk portion and the rib with respect to the blade are changed in the small horizontal fan according to the present invention.

FIG. 3 is a view showing an example in which the positional relationship between the suction aperture and the blades is changed in the small horizontal fan according to the present invention.

FIG. 4 is a view showing an example in which the length of the blade is made larger than the width of the disk portion in the small horizontal fan according to the present invention.

FIG. 5 is a cross-sectional view showing an example in which the small horizontal fan according to the present invention is applied to a double-sided suction case.

FIG. 6 is a sectional view showing an application example to a heat sink fan.

FIG. 7 is a view showing an example in which the sizes of the upper blade portion and the lower blade portion are changed in the small horizontal fan according to the present invention.

FIG. 8 is a sectional view showing another embodiment of the small horizontal fan according to the present invention, in which the configuration of the rotor base for housing the magnet is reversed.

FIG. 9 is a cross-sectional view showing still another embodiment of a small horizontal fan according to the present invention, which is an example applied to an outer rotor type heat sink.

FIG. 10 is a perspective view showing a conventional example of a blade structure of a small cross-flow fan.

FIG. 11 is a view of assembling the blade structure of FIG. 10 into a case.

FIG. 12 is a view for explaining another conventional example of a blade structure of a small cross-flow fan.

[Explanation of symbols]

1, 30, 38 ... rotors 2, 9a, 9b, 9c, 14a, 14b, 14c, 1
8, 31, 41 ... feathers 3, 33, 40 ... magnets 4, 10a, 10b, 10c, 15a, 15b, 15
c, 17, 26, 36a, 36b ... disk part 5, 11a, 11b, 11c, 16a, 16b, 16
c, 19, 37a, 37b ... rib 6 ... cylindrical part 7, 43 ... shaft 12a, 12b, 12c, 22 ... case 13a, 13b, 13c, 29, 42 ... suction port 21 ... stator 23a ... suction port 1) 23b ... Suction port 2) 24 ... outlet 25a, 34a, 34b ... upper blade part 25b, 35a, 35b ... lower blade part 28 ... heat sink 28a, 28b ... fin 32 ... yoke 39 ... stator

Claims (6)

[Claims] 1. A small cross-flow fan having a blower blade configured to blow air sucked from a substantially axial direction in a direction substantially perpendicular to an axis, wherein a plurality of blades are formed on a ring-shaped disk portion. A small cross-flow fan, wherein the portion is supported by a plurality of ribs implanted in the rotor casing portion, and a gap serving as a flow path is formed between the rotor casing portion and the blade portion. 2. The small cross flow device according to claim 1, wherein the ring-shaped disk portion is mounted on an extension of a rib, and the ring-shaped disk portion is mounted within a range of a blade height. fan. 3. A blade according to claim 1, wherein said blade extending in a substantially radial direction is located at a position such that a part thereof in the radial direction coincides with a peripheral edge of a suction port of a case accommodating said rotor. Small cross-flow fan. 4. The length of the blade extending substantially in the radial direction,
4. The small cross-flow fan according to claim 1, wherein the width is greater than the width of the ring-shaped disk portion. 5. The small cross-flow fan according to claim 1, wherein the fan case is configured to be able to be sucked from both sides. 6. The small cross-flow fan according to claim 1, wherein a fin of a heat sink is provided at an outlet of the fan.