JP2003278687A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an easily manufacturable thin blower. <P>SOLUTION: A plurality of discs overlapped mutually at certain intervals are used as rotary blades, and using air flow generated by resistance between the blades and the air when the blades are turned, the air is blown. The rotary blades are housed with a driving mechanism inside a housing, and an air flow passage is formed around the rotary blades to be connected to an exhaust hole. When an intake hole and the exhaust hole are arranged inside the rotation plane of the rotary blades, a thin cross flow fan can be realized. When the intake hole is arranged above or below the rotary blades, this blower functions as a thin sirocco fan. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a blower.
In particular, the present invention relates to a cooling blower suitable for electronic parts such as CPUs, plasma displays, small personal computers, and other fields where mounting space is severely restricted.

[0002]

2. Description of the Related Art Blowers are widely used as cooling devices for electronic equipment, but as the equipment becomes smaller and thinner, the blower itself is required to be smaller, especially thinner. Also,
Thinning the device means increasing the resistance when air flows in the housing. Therefore, the blower is required to have not only a thin shape but also a required static pressure. Further, cost reduction is a matter of course required, and even if a reduction in air flow and other blowing performance is unavoidable due to the thinning of the fan, it is necessary to suppress the reduction in cost performance as much as possible.

Axial fans are often used for cooling personal computers and their CPUs.
If the height is made small, it becomes difficult to secure the air volume.
Further, although the axial flow fan has a large air volume, it has a relatively low static pressure, which is not always satisfactory.

On the other hand, there is a method of using a centrifugal fan such as a sirocco fan instead of the axial fan. In this case, since the blade can be used by rotating it in a horizontal plane, if the thickness of the rotating blade is reduced, the space in the height direction can be greatly saved. However, in that case, the air volume is reduced by the amount of the thinned blade, while the manufacturing cost is almost unchanged, so that the cost performance is reduced.

In the cross-flow fan, the space in the height direction can be saved by narrowing the width of the rotary blades and arranging them so that they rotate in a horizontal plane. However, even in this case, although the formation of the wings is costly, the blowing capacity is reduced,
The decline in cost performance was unavoidable.

[0006]

The present invention provides a fan that is thin and can be installed by inserting it into a slight gap, has a relatively high static pressure, and has high cost performance.

[0007]

In order to achieve the above object, in the invention according to claim 1, a flat housing is provided,
A cup part having a bottomed cylindrical shape rotatably installed in the housing, and a rotary blade drive mechanism housed in part or in whole inside the cup part are stacked without contact with each other. A plurality of discs, a rotor blade having the plurality of discs fixed to a side surface of the cup portion so as to penetrate the cup portion, and a flow formed in a gap between the rotor blade and an inner surface of the housing. A blower having a passage, an intake port on the side surface of the housing, and an exhaust port on the side surface of the housing, wherein the intake port and the exhaust port are a gap between an inner peripheral surface of the housing and an outer edge of the rotary blade. Are communicated with each other by a flow path formed in the flow path, the flow path maintains a substantially constant cross-sectional area in the range from the intake port to the exhaust port, or increases the cross-sectional area toward the exhaust port, and The flow path is from the intake port The exhaust port, which is located on the opposite side of the rotating direction of the rotary blade and adjacent to the intake port, and the flow path is located in the rotating direction of the rotary blade when viewed from the exhaust port. There is provided a blower characterized by points, which is reduced in a region adjacent to the blower.

To achieve the above object, in the invention according to claim 2, a flat housing, a cup portion having a bottomed cylindrical shape rotatably installed in the housing, and an inner side of the cup portion. A part of or the entire drive mechanism of the rotor blades, a plurality of discs stacked without contacting each other, the plurality of discs on the side surface of the cup portion in a form penetrated by the cup portion. A fixed rotary blade,
A flow path formed in a gap between the rotor blade and an inner surface of the housing, an intake port opening to an upper surface or a lower surface of the housing, and an exhaust port on a side surface of the housing.
In the blower, the flow passage communicates with an exhaust port at one end thereof, and reduces the width toward the other end or extends while maintaining a constant width to surround the periphery of the rotary blade. A characteristic blower is provided.

In order to achieve the above object, in the invention according to claim 3, a flat housing, a cup portion having a bottomed cylindrical shape rotatably installed in the housing, and an inner side of the cup portion. A part of or the entire drive mechanism of the rotor blades, a plurality of discs stacked without contacting each other, the plurality of discs on the side surface of the cup portion in a form penetrated by the cup portion. A fixed rotary blade,
A blower having a flow path formed in a gap between the rotor blade and an inner surface of the housing, an exhaust port on the side surface of the housing, and an intake port on an upper surface or a lower surface of the housing, the flow path comprising: Communicating with the exhaust port at one end,
And, the width is reduced toward the other end or extended while maintaining a constant width so as to surround the periphery of the rotary vane, and each of the plurality of discs connects the air at the connection portion with the cup portion. Provided is a blower characterized by points having a gap for circulating the plate in the vertical direction.

In order to achieve the above object, in the invention according to claim 4, a flat housing, a cup portion having a bottomed cylindrical shape rotatably installed in the housing, and an inner side of the cup portion. A part of or the entire drive mechanism of the rotor blades, a plurality of discs stacked without contacting each other, the plurality of discs on the side surface of the cup portion in a form penetrated by the cup portion. A fixed rotary blade,
A blower having a flow path formed in a gap between the rotor blade and an inner surface of the housing, an exhaust port on the side surface of the housing, and an intake port on an upper surface or a lower surface of the housing, the flow path comprising: Communicating with the exhaust port at one end,
In addition, the width of the disk is reduced toward the other end or extended while maintaining a constant width so as to surround the periphery of the rotary blade, and among the plurality of disks, the disk adjacent to the intake port is the cup portion. There is provided a blower characterized by having a gap for allowing air to flow in the vertical direction of the disc at the connection part.

In order to achieve the above object, in the invention according to claim 5, in the blower according to claims 3 and 4, air is circulated in the vertical direction of the outer edge plate at the connection part with the cup part. The disk having the gap to be provided is fixed to the cup portion through three or more spokes to provide a blower characterized by points.

In order to achieve the above object, the invention according to claim 6 provides the blower according to claims 2 and 3, characterized in that it has intake ports on both upper and lower surfaces of the housing. provide.

In order to achieve the above object, in the invention according to claim 7, in the blower according to claim 4, there are intake ports on both upper and lower surfaces of the housing, and all of the discs. The number of sheets is 3 or more, and it is adjacent to each of the intake ports 2
There is provided a blower characterized in that a plurality of discs has a gap for allowing air to flow in a vertical direction of the disc at a connecting portion with the cup portion.

In order to achieve the above-mentioned object, in the invention according to claim 8, in at least a part of the surfaces of at least one of the disks constituting the rotary vane, a radial direction of the disk is provided. The blower according to any one of claims 1 to 7, wherein a plurality of radial grooves extending in the vertical direction are formed.

In order to achieve the above-mentioned object, in the invention according to claim 9, one or more of the disks constituting the rotary blade have a wavy shape in the circumferential direction, and The blower according to claim 1, wherein the corrugated shape is rotationally symmetrical with respect to the shaft.

In order to achieve the above object, the invention according to claim 10 is characterized in that at least a part of the surface of the disc and the circumferential portion are covered with a protrusion. The blower according to any one of claims 1 to 9 is provided.

In order to achieve the above object, in the invention according to claim 11, a plurality of through holes are formed in the disc so that the center of gravity of the disc coincides with the shaft mounting position. A blower according to any one of claims 1 to 11, having the characteristics.

According to the first aspect of the present invention, the rotation of the simple disc causes the air flow due to the friction of the circumferential portion and the surface, and the air can be blown. Since the blades that do not have three-dimensional unevenness are used as the rotor blades, the blower can be made extremely thin. Although it does not form a plurality of moving blades like those found in a normal cross-flow fan, a thin fan does not cause a significant deterioration in blowing efficiency. Rather, since the processing accuracy is improved by adopting a simple structure, it is possible to easily realize an increase in air volume due to high speed rotation. Further, the simple structure is very effective in reducing the cost.

According to the second aspect of the present invention, the centrifugal fan is constructed by providing an intake port on the upper surface of the housing. By doing so, a higher static pressure can be obtained.

According to the third aspect of the invention, in the structure of the centrifugal fan, a gap is provided at the portion where the disc is connected to the cup portion so that the air can flow vertically over the disc surface. By doing so, when a plurality of discs are mounted, it is possible to effectively utilize all the disc surfaces to send the wind, and thus the air volume is increased in addition to the static pressure.

According to a fourth aspect of the present invention, in addition to the structure similar to the third aspect, a gap is provided between the cup portion and the disc only for the disc closest to the intake port. The merit of adopting such a structure results from the fact that the present invention arranges the cup portion for housing the drive mechanism in the housing. That is, if the drive mechanism is placed outside the housing without considering the thinning of the blower, it is possible to form a cavity without placing the cup portion at the center of the disc. In that case, since the intake air is flown into the space between all the disks through the cavity at the center of the disks, a high blowing performance can be easily obtained.

However, according to the present invention, which is premised on thinning,
Since there is a cup portion directly below the intake port, even if a gap is provided between the disc and the cup portion, the supply range of intake air due to the gap is limited. That is, often, the intake air does not reach the third and subsequent disks counted from the intake port even if they are provided with a gap, which may not lead to the improvement of the blowing performance. In such a case, it is easier to manufacture and the structure is more robust if the gap is provided only in the disc closest to the intake port. Whether to adopt the structure of claim 3 or the structure of 4 is a design matter to be selected according to each purpose.

According to a fifth aspect of the present invention, in the third and fourth aspects of the present invention, a disc having a gap at the connecting portion between the disc and the cup portion has a structure in which the gap is supported by three or more spokes. ing. This is because it is difficult to stably support the disc with one or two pieces, and it is desirable to have a shape and arrangement that can be rotated with respect to the rotation axis even when there are three or more spokes. By doing so, not only can the disc be stably held even if a gap is formed, but also the effect that the spoke portion increases the air resistance and enhances the blowing ability can be obtained.

According to a sixth aspect of the present invention, there is provided a method according to the second or third aspect of the invention, in which intake ports are provided on both upper and lower surfaces. By doing so, the invention of claim 7 capable of increasing the air volume and the static pressure shows a method of providing the intake ports on both upper and lower surfaces in the invention of claim 4. According to the description of claim 4, the upper and lower discs have a gap between them and the cup portion. However, this is not a problem when the number of disks is three or more, but when the number of disks is two, claim 3
Will be included in the range. Therefore, the total number is limited to three or more. With such a configuration, it is possible to further increase the air volume and the static pressure as compared with the method of claim 4.

According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, the disk surface is provided with a groove extending in the radial direction. This increases the friction between the disc and the air, increasing the air volume and static pressure.

According to the ninth aspect of the present invention, the efficiency of air blowing is increased by forming the disc into a wavy shape in the circumferential direction.

According to the tenth aspect of the present invention, by providing flagella-like projections on the surface of the rotating disk, it is possible to increase the friction between the disk surface and the air and increase the amount of air blown.

In the eleventh aspect of the present invention, a through hole is formed in the disc to be rotated to increase friction between the disc surface and air, and to make the disc lighter to facilitate high-speed rotation and to reduce static pressure. The amount of air blow can be increased.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a blower according to the present invention. The rotary blade 2 is a circular flat plate and rotates around the shaft 8. An air passage 5 is formed between the rotary blade and the housing 1, and extends so as to cover the circumference of the rotary blade while gradually widening toward the exhaust port 4. In this figure, the rotary blade 2 rotates counterclockwise.

The width 6b of the flow passage at the position on the opposite side of the rotating direction of the rotary blade in the portion adjacent to the intake port 3 is smaller than the width 6a of the flow passage at the position in the rotating direction. Similarly, the width 7b of the flow passage in the position adjacent to the exhaust port 4 in the rotational direction of the rotary vane when viewed from the exhaust port is smaller than the width 7a of the flow path in the reverse rotational position. The width 6b of the flow passage may be narrowed to the extent that the flow passage does not substantially exist like 7b. On the contrary, even if the width 7b of the flow path is slightly larger than that of FIG. 1, as long as it is smaller than 7a, the function as a blower is maintained.

In FIG. 1, the intake port 3 is opened on the side surface of the housing that faces the right side in the figure, but if it is opened on the side surface that faces the bottom side in the figure, it is noted in claim 1. The conditions are met and it functions as a blower.

FIG. 2 is a sectional view of the blower shown in FIG. As is clear from the figure, a plurality of flat blades 2 are provided. Therefore, a larger air volume can be secured as compared with the case where there is only one rotary blade.

A shaft 8, a bearing 9, a stator 11 and a magnet 12 are housed inside a cup portion 10 located at the center of the rotary blade, and constitute a drive mechanism for the rotary blade. With such a configuration, it is not necessary to provide a drive unit for the rotary blades outside the housing, which is suitable for downsizing and thinning of the blower.

(Second Embodiment) FIGS. 3 and 4 relate to a second embodiment of the present invention. Although FIG. 3 is similar to FIG. 1, in this embodiment, since the intake port is provided not on the housing side surface but on the upper surface (top surface) of the housing, the intake port is not shown in FIG.

FIG. 4 is a sectional view of the blower shown in FIG. Unlike FIG. 2, the intake port 113 is provided near the center of the upper surface of the housing.
Is open. Although the cup 110 is located at the center of the opening, a protective cover may be installed so as not to touch the rotating cup from the outside. In this example, the intake port is opened only on the upper surface side, but providing the intake ports on both the upper and lower surfaces does not cause any problem, and a favorable result is obtained because the air flow rate increases.

(Third Embodiment) FIG. 5 relates to a third embodiment of the present invention. FIG. 5 shows an example of a structure in which the upper and lower surfaces of the housing are provided with intake ports, and the discs forming the rotary blade have a gap at the connecting portion with the cup portion. The drive mechanism such as the stator 211 housed in the cup portion 210 is mounted on the drive mechanism attachment portion 215. The drive mechanism attachment portion is supported by the spokes extending from the housing 201, similarly to the support structure of the disk 202 described later. A plan view of the individual discs 202 is shown in FIG. The disc is supported by the spokes 216b, and a gap 216 is formed between the spokes.

Since air is taken in through the upper and lower intake ports and supplied to the disc gap through the gap 216, the air can be efficiently transported by friction.

(Fourth Embodiment) FIG. 6 relates to a fourth embodiment of the present invention. The fan of FIG. 6 has a housing 30.
In the example of the structure in which the air inlets 313a and 313b are provided on both upper and lower sides of 1 and only the discs forming the rotor blades adjacent to the air inlet have the gap 216 at the connecting portion with the cup portion. is there. Similar to the third embodiment, the cup portion 3
The drive mechanism such as the stator 311 housed in the unit 10 is mounted on the drive mechanism attachment portion 315. In this example, a simple disk 302 having no gap is used for the second disk located from the intake port. Even if it does in this way, compared with the air blower of Drawing 5, air blow performance does not fall so much. On the other hand, since the number of discs supported by the spokes is reduced, the rotor blades become more robust, which has a positive effect on suppressing vibration.

(Fifth Embodiment) FIG. 8 relates to a fourth embodiment of the present invention, in which grooves 22 extending radially are formed on the surface of a disk constituting a rotary blade. . Since the groove 22 increases the resistance to the air, a larger amount of air can be secured.

(Sixth Embodiment) FIG. 9 relates to a fifth embodiment of the present invention, which is a disk 2 constituting a rotary blade.
3 shows a perspective view of d. The rotary blade 2d has a shape in which a disc is wavy in the circumferential direction. In the figure, the dotted line shows the contour of the disk when there is no waviness. With this structure, the blowing capacity is increased, and at the same time, the rigidity against deformation in the radial direction is increased, so vibration and deformation during rotation are suppressed,
Even when rotating at high speed, vibration is low and noise is suppressed.

(Seventh Embodiment) FIG. 10 relates to a sixth embodiment of the present invention and shows a plan view of a disk 2e constituting a rotary blade. Flagella-shaped protrusions 23 are arranged on the surface and the circumferential portion of the wing. These protrusions increase the resistance to air and increase the amount of air blown. The protrusions arranged on the rotary blade are not limited to the flagella, and a similar effect can be obtained with a cylindrical small protrusion or the like.

(Eighth Embodiment) FIG. 11 relates to a fifth embodiment of the present invention and shows a plan view of a rotary blade in which a through hole 24 is formed in a disc 2f constituting the rotary blade. There is. The holes are distributed symmetrically with respect to the center of the disk so as not to hinder the rotation. By doing so, not only the resistance to the air increases and the air volume increases, but also the rotary blades can be made lighter, which facilitates high-speed operation and increases the air volume.

In each of the above embodiments, the material forming the disk does not necessarily have rigidity.
For example, a blower can be configured even with a flexible material such as a polyester film.

[0044]

As described above, according to the first aspect of the invention, it is possible to construct a blower which is thin and has a relatively simple structure and which intakes air from the side surface and exhausts it from the side surface. .

According to the method of claim 2, a thin type,
It is possible to configure a blower that takes in air from either the upper or lower surface and exhausts it from the side surface.

According to the method of claim 3, claim 2
It is possible to increase the air volume and static pressure of the blower.

According to the method of claim 4, claim 2
The blower has a robust structure, and high static pressure and air volume can be secured.

According to the method described in claim 5, a high static pressure and a high air flow can be secured, and at the same time, a rotary blade with little vibration can be obtained.

According to the methods described in claims 6 and 7, it is possible to obtain a thin blower having a higher static pressure and a higher air volume.

According to the methods described in claim 8, claim 9 and claim 10, it is possible to obtain a rotating disk having a higher blowing capacity.

According to the eleventh aspect of the present invention, it is possible to enhance the air blowing capacity per rotor blade and, at the same time, facilitate high-speed operation and high-speed rotation to further increase the air volume and static pressure.

[Brief description of drawings]

FIG. 1 is a plan view of a blower according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the blower according to the first embodiment of the present invention.

FIG. 3 is a plan view of a blower according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a blower according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a blower according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a blower according to a fourth embodiment of the present invention.

FIG. 7 is a plan view of a disc of a rotary blade according to third and fourth embodiments of the present invention.

FIG. 8 is a plan view of a disk of a rotary blade according to a fifth embodiment of the present invention.

FIG. 9 is a plan view of a disc of a rotary blade according to a sixth embodiment of the present invention.

FIG. 10 is a plan view of a disc of a rotary blade according to a seventh embodiment of the present invention.

FIG. 11 is a plan view of a disk of a rotor according to an eighth embodiment of the present invention.

[Explanation of symbols]

1, 101, 201, 301 housing 2, 102, 302 rotor blade 202 rotor blade with gap 216 gap 216b spoke 2c rotor blade with groove 2d wavy rotor blade 2e rotor blade with flagella 2f rotor blade with through hole 22 groove 23 flagella 24 Through hole 3 Intake ports 4, 104, 204, 304 Exhaust ports 5, 105, 105a, 205a, 305a on the side of the housing Flow path 5a Flow paths 5b, 105b, 205b, 305b near the intake port Flow path 6a near the exhaust port Width 6b of the flow passage at the position near the inlet rotation direction Width of the flow passage 7a at the position opposite the rotation near the intake port 7a Width of the flow passage at the position opposite the rotation near the exhaust port 7b Width 8, 108, 208, 308 Shaft 9, 109, 209, 309 Bearing 10, 110, 210, 310 Cup 11,111,211,311 stator 12,112,212,312 magnet 113,213a, 313a top side air inlet 213b, 313b bottom side air inlet 215, 315 drive mechanism mounting section

Claims (11)

[Claims] 1. A flat housing, a cup portion having a bottomed cylindrical shape rotatably installed in the housing, and a rotary blade drive mechanism having a part or the whole housed inside the cup portion. A plurality of discs that are stacked without contacting each other, and a rotary blade that is fixed to the side surface of the cup portion such that the plurality of discs penetrates the cup portion,
A blower having a flow path formed between the rotor blade and an inner surface of the housing, an intake port on the housing side surface, and an exhaust port on the housing side surface, wherein the intake port and the exhaust port are Is connected by a flow passage formed in a gap between the inner peripheral surface of the housing and the outer edge of the rotary blade, and the flow passage has a substantially constant cross-sectional area in a range from an intake port to an exhaust port. Alternatively, the cross-sectional area is increased toward the exhaust port, and the flow path is reduced in a portion adjacent to the intake port, which is located on the opposite side of the rotation direction of the rotor blade when viewed from the intake port. The blower characterized in that the flow path is located in the rotation direction of the rotary blade as viewed from the exhaust port and is reduced at a portion adjacent to the exhaust port. 2. A flattened housing, a cup portion having a bottomed cylindrical shape rotatably installed in the housing, and a rotary blade drive mechanism having a part or the whole housed inside the cup portion. A plurality of discs that are stacked without contacting each other, and a rotary blade that is fixed to the side surface of the cup portion such that the plurality of discs penetrates the cup portion,
A blower having a flow passage formed between the rotary vane and an inner surface of the housing, an intake port opening to an upper surface or a lower surface of the housing, and an exhaust port on a side surface of the housing, The blower is characterized in that one end thereof communicates with the exhaust port, and the width thereof is reduced toward the other end or extended toward the other end while maintaining a constant width to surround the circumference of the rotary blade. 3. A flat blade housing, a cup portion having a bottomed cylindrical shape rotatably installed in the housing, and a rotary blade drive mechanism having a part or the whole housed inside the cup portion. A plurality of discs that are stacked without contacting each other, and a rotary blade that is fixed to the side surface of the cup portion such that the plurality of discs penetrates the cup portion,
A blower having a flow path formed in a gap between the rotor blade and an inner surface of the housing, an exhaust port on the side surface of the housing, and an intake port on an upper surface or a lower surface of the housing, the flow path comprising: Communicating with the exhaust port at one end,
And, the width is reduced toward the other end or extended while maintaining a constant width so as to surround the periphery of the rotary vane, and each of the plurality of discs connects the air at the connection portion with the cup portion. An air blower characterized by points having a gap that allows the plate to flow in the vertical direction. 4. A flat blade housing, a cup portion having a bottomed cylindrical shape rotatably installed in the housing, and a rotary blade drive mechanism in which a part or the whole is housed inside the cup portion. A plurality of discs that are stacked without contacting each other, and a rotary blade that is fixed to the side surface of the cup portion such that the plurality of discs penetrates the cup portion,
A blower having a flow path formed in a gap between the rotor blade and an inner surface of the housing, an exhaust port on the side surface of the housing, and an intake port on an upper surface or a lower surface of the housing, the flow path comprising: Communicating with the exhaust port at one end,
In addition, the width of the disk is reduced toward the other end or extended while maintaining a constant width so as to surround the periphery of the rotary blade, and among the plurality of disks, the disk adjacent to the intake port is the cup portion. A blower characterized in that it has a gap for allowing air to flow in the vertical direction of the disc at the connection part. 5. The blower according to claim 3 or 4,
An air blower characterized in that the disc having a gap for allowing air to flow in the vertical direction of the outer edge plate at a connection portion with the cup portion is fixed to the cup portion via three or more spokes. 6. The blower according to claim 2 or 3, characterized in that it has intake ports on both upper and lower surfaces of said housing. 7. The blower according to claim 4, wherein the housing has intake ports on both upper and lower surfaces, and the total number of the disks is three or more, and the air intake ports are adjacent to each of the intake ports. An air blower characterized in that two discs have a gap for allowing air to flow in the vertical direction of the discs at a connection portion with the cup portion. 8. A plurality of radial grooves extending in the radial direction of the disk is formed on at least a part of the surface of at least one of the disks constituting the rotary blade. The blower according to any one of claims 1 to 7. 9. One or more of the disks constituting the rotary vane has a wavy shape in the circumferential direction, and the wavy shape is rotationally symmetrical with respect to the shaft. The blower according to claim 1, wherein the blower is provided. 10. The blower according to claim 1, wherein at least a part of the disk surface and the circumferential portion is covered with a protrusion. 11. The blower according to claim 1, wherein the disk has a plurality of through holes so that the center of gravity of the disk coincides with a shaft mounting position.