The present invention is related to a heat-dissipating fan and its housing, and especially to an axial-flow fan and its housing.
In a normal electronic product such as a computer, electronic devices will generate a lot of heat during operation. If the electronic devices are continuously operated at high temperature, they are easily damaged. Thus, to prevent such a damage, a heat-dissipating fan is normally disposed in the electronic product to dissipate heat to the surrounding.
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Thus, it is desirable to reduce the air turbulence noise of the axial-flow fan generated while rotating.
The present invention provides a heat-dissipating fan including a first housing, a first impeller having a hub and a plurality of blades arranged around the hub, a base disposed inside the housing for supporting the first impeller, and an air-guiding member disposed between the housing and the base, and having a first edge with a first inclined angle relative to a line perpendicular to an axis of the heat-dissipating fan.
The first edge of the air-guiding member is located on a windward side of the heat-dissipating fan and the first inclined angle is preferably ranged from 3° to 45°.
In addition, the air-guiding member has a second edge located opposite to the first edge and having a second inclined angle relative to the line. The second inclined angle is preferably ranged from 3° to 45°. The first inclined angle can be greater than, equal to or less than the second inclined angle.
In one embodiment, at least one blade of the impeller has an edge with a third inclined angle relative to the line, and the third inclined angle is preferably ranged from 3° to 45°. At least one blade of the impeller can also have an opposite edge with a fourth inclined angle relative to the line, and the fourth inclined angle is preferably ranged from 3° to 45°, wherein the third inclined angle can be greater than, equal to or less than the fourth inclined angle.
The air-guiding member is positioned on an air inlet or an air outlet of the heat-dissipating fan. The air-guiding member has one end connected to the base and the other end free extending toward a direction of an inner wall of the first housing. Or, the air-guiding member has one end connected to an inner wall of the first housing and the other end free extending toward a direction of the base. Alternatively, the air-guiding member is composed of a plurality of ribs or stationary blades, a portion of which respectively have one end connected to the base and the other end free extending toward a direction of an inner wall of the first housing, and other portion of which respectively have one end connected to an inner wall of the first housing and the other end free extending toward a direction of the base. The number of ribs or stationary blades is preferably unequal to that of the blades of the first impeller.
Preferably, the air-guiding member has a gradually increasing or decreasing cross-section area from the base toward the first housing. Or, the air-guiding member has a central part with a thickness relatively greater or smaller than those of two opposite ends thereof.
Preferably, the air-guiding member has a stick, curved, trapezoid, or wing-like cross-section shape.
Preferably, the blades have a curved or wing-like cross-section with an inclined angle ranging from 15° to 60° relative to the axis of the heat-dissipating fan.
On the other hand, the heat-dissipating fan further includes a metallic shell telescoped inside the hub and having a plurality of openings, wherein the metallic shell has a stepped structure formed on a periphery of a top portion of the metallic shell.
Moreover, the heat-dissipating fan further includes a driving device mounted inside the hub for driving the first impeller.
The hub has a plurality of through holes formed on a top portion thereof, and has a inclined or arc structure formed on a periphery of a top portion thereof, and a vertical portion. The blades of the first impeller respectively have an upper inner edge positioned at an interface between the inclined or arc structure and the vertical portion, and a lower inner edge relatively higher than a bottom end of the vertical portion.
Further, the first housing has an outwardly expanding part located on an air inlet side or an air outlet side of the heat-dissipating fan for increasing an air intake or discharge. The first housing further includes a cylindrical part and the air-guiding member has one end connected to the base and the other end connected to an inner wall of the cylindrical part. Alternatively, the air-guiding member has one end connected to the base and the other end connected to inner walls of the cylindrical part and the outwardly expanding part simultaneously.
Preferably, the base, the air-guiding member and the first housing are integrally formed as a monolith piece by injection molding.
In another embodiment, the heat-dissipating fan further includes a second impeller with a hub and a plurality of blades disposed around the hub and axially arranged with the first impeller in series, and a second housing for receiving the second impeller therein. The second housing can be assembled with the first housing by screwing, engaging, riveting or adhering. Alternatively, the second housing is integrally formed with the first housing as a monolith piece by injection molding.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
a is a sectional view of the first preferred embodiment of the heat-dissipating fan of the present invention;
b is a sectional view of another embodiment of the heat-dissipating fan of the present invention;
The present invention will now be described more detailedly with reference to the following embodiments. It is to be noted that the following descriptions of the preferred embodiments of this invention are presented herein for the purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
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The heat-dissipating fan further includes an impeller 22 having a hub 221 and a plurality of blades 222 arranged around the hub 221. The hub 221 has an inclined structure 221a located on a periphery of a top portion thereof for smoothly guiding more airflow toward the blades 222. Except that the housing 20 can be shaped as a square structure as shown in
The heat-dissipating fan further includes a metallic shell 25 telescoped inside the hub 221, which has a stepped structure 25b on its upper edge corresponding to the position of the inclined structure 221a of the hub. The driving device 24 can be mounted inside the hub and the metallic shell for reducing the occupied space. In addition, the metallic shell 25 has a plurality of openings 25a formed on a top thereof for effectively dissipating the heat generated inside the fan while operating.
The housing 20 has an outwardly expanding part 20a located at the air outlet side of the fan and another outwardly expanding part 20b located at the air inlet side of the fan for increasing the intake and discharge airflow and smoothly guiding the airflow toward the impeller.
The air-guiding member 23 can be composed of a plurality of ribs or stationary blades connected between the outwardly expanding part 20a and the base 21. However, the arrangement of the air-guiding members 23 can be varied or modified according to the actual application. For example, one end of the air-guiding member 23 is connected to the base 21 and the other end thereof is free and extended toward the outwardly expanding part 20a as shown in
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In the above-described embodiments, one end of the air-guiding member 23 is connected to the base 21 and the other end is fixed onto the inner wall of the cylindrical part 20c. Alternatively, one end of the air-guiding member 23 can be connected to the base 21 and the other end can be simultaneously connected to the inner wall of the cylindrical part 20c and the inner wall of the outwardly expanding part 20a. In addition, the upper and lower edges of the air-guiding member 23 can be but not limited to be inclined at the same time. It can be optionally modified according to the actual application.
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In conclusion, the present invention provides a heat-dissipating fan and its housing with an upward air-guiding member which can greatly reduce the noise of air turbulence and increase the air pressure and quantity so as to enhance its whole heat dissipation efficiency.
While the invention has been described in terms of what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention need not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Number | Date | Country | Kind |
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93125858 A | Aug 2004 | TW | national |
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Number | Date | Country | |
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20060045736 A1 | Mar 2006 | US |