US20120213650A1 - Cooling Fan with Dual Rotation Directions - Google Patents
Cooling Fan with Dual Rotation Directions Download PDFInfo
- Publication number
- US20120213650A1 US20120213650A1 US13/076,565 US201113076565A US2012213650A1 US 20120213650 A1 US20120213650 A1 US 20120213650A1 US 201113076565 A US201113076565 A US 201113076565A US 2012213650 A1 US2012213650 A1 US 2012213650A1
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- US
- United States
- Prior art keywords
- air
- cooling fan
- stationary blade
- blade unit
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 91
- 230000009977 dual effect Effects 0.000 title claims abstract description 33
- 239000000428 dust Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/542—Bladed diffusers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
- F04D19/005—Axial flow fans reversible fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/0633—Details of the magnetic circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention generally relates to a cooling fan and, more particularly, to a cooling fan having an impeller with dual rotation directions and capable of controlling the timing at which the rotation direction of the impeller is switched.
- a conventional cooling fan generally has a fan frame having a base disposed therein.
- the base is coupled with a motor for driving an impeller to rotate.
- the base is connected to the fan frame at an air outlet via a plurality of ribs.
- the impeller drives the air to pass through the air outlet, the ribs tend to hinder the air from entering the conventional cooling fan, thus decreasing the performance of the conventional cooling fan.
- Taiwanese Patent No. 488497 discloses an apparatus for increasing air pressure and guiding airflows of the conventional cooling fan.
- the apparatus 9 includes an airflow guiding device 91 resembling blades (which is also known as stationary blades).
- the airflow guiding device 91 may be disposed at an air outlet of the conventional cooling fan opposing to a plurality of blades 92 of the conventional cooling fan. In such an arrangement, when the blades 92 drive the air to pass through the air outlet of the conventional cooling fan, the airflow guiding device 91 may increase the pressure of the air flowing out of the conventional cooling fan.
- Taiwanese Patent No. M388570 discloses another conventional cooling fan with dual rotation directions.
- the conventional cooling fan includes a blade unit, an electric machinery and a controller.
- the controller can control the blade unit to rotate in a forward or reverse direction via the electric machinery, thereby performing the cooling and dust exhaustion operations of the conventional cooling fan.
- the apparatus 9 When the conventional cooling fan rotates in a forward direction for cooling purpose, the apparatus 9 does increase the air pressure of the air outlet of the conventional cooling fan. However, when the conventional cooling fan rotates in a reverse direction for dust exhaustion, the air outlet of the conventional cooling fan will become an entrance of airflows and an air inlet of the conventional cooling fan will become an exit of airflows. Since the air inlet of the conventional cooling fan is not designed with any structure capable of increasing the pressure of the air passing therethrough, the dust exhaustion will not be performed in an efficient way due to the small air pressure. In overall, the apparatus 9 provides the conventional cooling fan different air-driving effects when the conventional cooling fan rotates in different direction.
- the apparatus 9 can drive the air in a larger strength when the conventional cooling fan rotates in the forward direction for cooling purpose, but drives the air in a relatively small strength when the conventional cooling fan rotates in the reverse direction for dust exhaustion. This results in poorer performance in dust exhaustion.
- the invention discloses a cooling fan with dual rotation directions, which includes a fan frame unit, a driving control unit and an impeller.
- the fan frame unit has an air channel having first and second air-guiding openings on two sides of the air channel.
- a base is disposed between the first and second air-guiding openings.
- a first stationary blade unit is disposed at the first air-guiding opening and a second stationary blade unit is disposed at the second air-guiding opening.
- the driving control unit has a stator, a driving circuit and a rotation direction control circuit, wherein the stator is disposed on the base of the fan frame unit and the driving circuit is electrically connected to the stator and the rotation direction control circuit.
- the impeller is rotatably coupled with the stator of the driving control unit.
- FIG. 1 shows a diagram of an apparatus for increasing air pressure and guiding airflows of a conventional cooling fan.
- FIG. 2 shows an exploded diagram of a cooling fan with dual rotation directions according to a preferred embodiment of the invention.
- FIG. 3 shows a side cross-sectional diagram of the cooling fan with dual rotation directions of the invention.
- FIG. 4 shows an implementation of a fan frame unit of the cooling fan with dual rotation directions of the invention.
- FIG. 5 shows a side cross-sectional diagram of the cooling fan with dual rotation directions of the invention, in which the cooling fan includes a first stationary blade unit and a second stationary blade unit comprising a plurality of stationary blades having a different oblique angle from a plurality of stationary blades of the first stationary blade unit.
- FIG. 6 shows a side cross-sectional diagram of the cooling fan with dual rotation directions of the invention, in which both the first and second stationary blade units have an air-guiding portion.
- a cooling fan with dual rotation directions of the invention at least includes a fan frame unit 1 , a driving control unit 2 and an impeller 3 .
- the fan frame unit 1 is coupled with the driving control unit 2 when the driving control unit 2 is disposed in the fan frame unit 1 .
- the impeller 3 is rotatably coupled with the driving control unit 2 such that the driving control unit 2 can control the impeller 3 to rotate in a forward or reverse direction.
- the fan frame unit 1 consists of at least a hollow frame and has an air channel 11 .
- the air channel 11 has a first air-guiding opening 111 and a second air-guiding opening 112 on two sides thereof, with a base 12 disposed between the first air-guiding opening 111 and second air-guiding opening 112 .
- the first air-guiding opening 111 has a first stationary blade unit 13 disposed thereat and the second air-guiding opening 112 has a second stationary blade unit 14 disposed thereat.
- the fan frame unit 1 consists of a first frame 1 a and a second frame 1 b .
- the first frame 1 a and second frame 1 b may be detachably assembled together so that the interior spaces of the first frame 1 a and second frame 1 b may communicate with each other to form the air channel 11 .
- the first air-guiding opening 111 is located in the first frame 1 a and the second air-guiding opening 112 is located in the second frame 1 b .
- the base 12 is located in the first frame 1 a .
- Both the first stationary blade unit 13 and second stationary blade unit 14 consist of a plurality of stationary blades.
- the first stationary blade unit 13 is disposed in the first frame 1 a and adjoins the first air-guiding opening 111
- the second stationary blade unit 14 is disposed in the second frame 1 b and adjoins the second air-guiding opening 112 .
- the base 12 is coupled with an inner circumferential wall of the first frame 1 a via the stationary blades of the first stationary blade unit 13 .
- the fan frame unit 1 is shown to consist of the first frame 1 a and second frame 1 b , more than two frames can be used to form the fan frame unit 1 .
- the fan frame unit 1 may consist of the first frame 1 a , the second frame 1 b and a third frame 1 c , with the third frame 1 c sandwiched between the first frame 1 a and second frame 1 b . Therefore, the fan frame unit 1 is allowed to comprise at least one hollow frame if it won't affect the assembly of the driving control unit 2 and impeller 3 , as can be readily appreciated by one skilled in this art.
- the driving control unit 2 has a stator 21 , a driving circuit 22 and a rotation direction control circuit 23 .
- the stator 21 is disposed on the base 12 of the fan frame unit 1 and rotatably coupled with the impeller 3 .
- the driving circuit 22 is electrically connected to the stator 21 .
- the rotation direction control circuit 23 is electrically connected to the driving circuit 22 . Based on this, the rotation direction control circuit 23 can control the forward or reverse rotation of the impeller 3 via the driving circuit 22 .
- the driving circuit 22 and rotation direction control circuit 23 can be integrated into an integrated chip (IC).
- the impeller 3 has a hub 31 rotatably coupled with the stator 21 of the driving control unit 2 .
- the hub 31 has a plurality of vanes 32 on an outer circumferential wall thereof.
- the vanes 32 drive the air to pass through the first air-guiding opening 111 and second air-guiding opening 112 when the driving control unit 2 drives the hub 31 to rotate (one skilled in the art may readily appreciate that the driving control unit 2 drives the hub 31 to rotate under alternating magnetic fields, so it is not described herein again).
- the driving control unit 2 may control the hub 31 to rotate in the forward or reverse direction.
- one of the first air-guiding opening 111 and second air-guiding opening 112 will serve as an air inlet, depending on the rotation direction of the cooling fan.
- both the first air-guiding opening 111 and second air-guiding opening 112 can serve as an air inlet and an air outlet.
- both the first air-guiding opening 111 and second air-guiding opening 112 may serve the cooling purpose.
- the cooling fan may drive and guide the internal air of the fan frame unit 1 to a heat-emitting source for cooling operation when the cooling fan rotates in the forward direction, as well as to another heat-emitting source for cooling operation when the cooling fan rotates in the reverse direction.
- the first air-guiding opening 111 may serve the cooling purpose and the second air-guiding opening 112 may serve the dust exhaustion purpose.
- the cooling fan with dual rotation directions of the invention may be mounted on an electronic product when the first air-guiding opening 111 of the fan frame unit 1 faces a predetermined portion of the electronic product where heat is constantly emitted.
- the rotation direction control circuit 23 of the driving control unit 2 can send a control signal to the driving circuit 22 which, in turn, drives the stator 21 to generate magnetic fields upon receipt of the control signal.
- the generated magnetic fields can drive the impeller 3 to rotate in a first direction (which can be the reverse or forward direction), drawing the external air into the fan frame unit 1 via the second air-guiding opening 112 .
- the impeller 3 guides the drawn air to travel in the air channel 11 and the internal air of the fan frame unit 1 is then exhausted via the first air-guiding opening 111 and guided to the predetermined portion of the electronic product for cooling operation.
- the first air-guiding opening 111 serves as an air outlet and the second air-guiding opening 112 serve as an air inlet.
- the cooling fan of the invention when the cooling fan of the invention operates in a long time, dust contained in the air will accumulate in the fan frame unit 1 .
- the dust may remain on the first air-guiding opening 111 , second air-guiding opening 112 or vanes 32 of the impeller 3 and so on.
- the rotation direction control circuit 23 of the driving control unit 2 can send another control signal to the driving circuit 22 which, in turn, drives the stator 21 to generate magnetic fields. Due to the switch of control signal, the generated magnetic fields will drive the impeller 3 to rotate in a second direction opposite to the first direction, drawing the external air into the fan frame unit 1 via the first air-guiding opening 111 .
- the impeller 3 guides the drawn air to travel in the air channel 11 and the internal air of the fan frame unit 1 is then exhausted via the second air-guiding opening 112 . In this way, the dust accumulated in the fan frame unit 1 can be blown away by the airflows.
- the first air-guiding opening 111 serves as an air inlet and the second air-guiding opening 112 serve as an air outlet.
- the cooling fan with dual rotation directions of the invention is characterized in that the first air-guiding opening 111 of the fan frame unit 1 is provided with the first stationary blade unit 13 and the second air-guiding opening 112 of the fan frame unit 1 is provided with the second stationary blade unit 14 .
- the first stationary blade unit 13 may increase the pressure of the air passing through the first air-guiding opening 111 when the first air-guiding opening 111 serves as an air outlet.
- the second stationary blade unit 14 may increase the pressure of the air passing through the second air-guiding opening 112 when the second air-guiding opening 112 serves as an air outlet.
- the first air-guiding opening 111 serves as an air outlet
- the second stationary blade unit 14 disposed at the second air-guiding opening 112 will hinder the air from entering the fan frame unit 1 .
- the second air-guiding opening 112 serves as an air outlet
- the first stationary blade unit 13 disposed at the first air-guiding opening 111 will also hinder the air from entering the fan frame unit 1 .
- the first stationary blade unit 13 hinders the air from entering the fan frame unit 1 when the second air-guiding opening 112 serves as an air outlet, the first stationary blade unit 13 does increase the pressure of the air flowing out of the fan frame unit 1 at the same moment.
- the cooling fan of the invention can provide almost the same air-driving effect at the first air-guiding opening 111 and second air-guiding opening 112 regardless of rotation direction of the impeller 3 .
- the cooling fan with dual rotation directions of the invention can provide a heat-emitting source almost the same cooling effect at the first air-guiding opening 111 and second air-guiding opening 112 .
- the cooling operation will be as efficient as the dust exhaustion operation.
- the first air-guiding opening 111 and second air-guiding opening 112 of the cooling fan may not drive the internal air of the fan frame unit 1 in a most efficient way, they do provide the required air-driving effect.
- the cooling fan with dual rotation directions of the invention provides almost the same air-driving effect at the first air-guiding opening 111 and second air-guiding opening 112 regardless of rotation direction of the cooling fan, the first air-guiding opening 111 or the second air-guiding opening 112 can be chosen to face the electronic product while mounting the cooling fan on the electronic product.
- the cooling fan of the invention allows either air-guiding opening to face the electronic product while mounting the cooling fan on the electronic product. This prevents the cooling fan from being mounted on the electronic product in an incorrect way. Therefore, it will not be required to remount the cooling fan on the electronic product due to the incorrect mounting of the cooling fan, thus improving the assembly convenience of the cooling fan.
- the cooling fan with dual rotation directions of the invention may include one or more of the following secondary features for further improvement, as described below.
- the first stationary blade unit 13 is disposed in a different direction from the second stationary blade unit 14 in an axial direction of the impeller 3 .
- the first stationary blade unit 13 is disposed at the first air-guiding opening 111 in a way that the stationary blades of the first stationary blade unit 13 extend from bottom-right to top-left corners in cross sections thereof
- the second stationary blade unit 14 is disposed at the second air-guiding opening 112 in a way that the stationary blades of the second stationary blade unit 14 extend from bottom-left to top-right corners in cross sections thereof.
- the first stationary blade unit 13 extends in an opposite direction to the second stationary blade unit 14 in the axial direction of the impeller 3 .
- the oblique angle of the stationary blades of the first stationary blade unit 13 and second stationary blade unit 14 with respect to the axial direction of the impeller 3 may be properly adjusted according to the angle of the vanes 32 of the impeller 3 (for example, the oblique angle of the stationary blades of the first stationary blade unit 13 is different from that of the stationary blades of the second stationary blade unit 14 in both FIGS. 3 and 5 ). Therefore, the structure of the first stationary blade unit 13 and second stationary blade unit 14 may be designed in a flexible way that conforms to the angle of the vanes 32 of the impeller 3 for achieving best air-driving effect at the first air-guiding opening 111 and second air-guiding opening 112 , regardless of rotation direction of the cooling fan.
- the stationary blades of the first stationary blade unit 13 can have the same oblique angle as those of the second stationary blade unit 14 . This allows the first stationary blade unit 13 and second stationary blade unit 14 to be manufactured using a single mold for cost reduction.
- the first stationary blade unit 13 may further include an air-guiding portion 131 at a center thereof. Based on this, when the first air-guiding opening 111 serves as an air inlet drawing the external air into the air channel 11 , the air-guiding portion 131 may efficiently guide the external air to pass through the first stationary blade unit 13 .
- the second stationary blade unit 14 may further include an air-guiding portion 141 at a center thereof. Based on this, when the second air-guiding opening 112 serves as an air inlet drawing the external air into the air channel 11 , the air-guiding portion 141 may efficiently guide the external air to pass through the second stationary blade unit 14 . With the arrangement of the air-guiding portions 131 and 141 , the cooling or dust exhaustion efficiency of the cooling fan can be improved.
- the cooling fan with dual rotation directions of the invention does provide almost the same air-driving effect at both first and second air-guiding openings 111 and 112 no matter which direction the cooling fan rotates in.
- desired air-driving effect can be provided no matter which of the first and second air-guiding openings 111 and 112 is used as an air outlet.
- the invention allows the cooling fan to be mounted on the electronic product in a convenient way.
Abstract
A cooling fan with dual rotation directions includes a fan frame unit, a driving control unit and an impeller. The fan frame unit has an air channel having first and second air-guiding openings on two sides of the air channel. A base is disposed between the first and second air-guiding openings. A first stationary blade unit is disposed at the first air-guiding opening and a second stationary blade unit is disposed at the second air-guiding opening. The driving control unit has a stator, a driving circuit and a rotation direction control circuit, wherein the stator is disposed on the base of the fan frame unit and the driving circuit is electrically connected to the stator and the rotation direction control circuit. The impeller is rotatably coupled with the stator of the driving control unit.
Description
- 1. Field of the Invention
- The present invention generally relates to a cooling fan and, more particularly, to a cooling fan having an impeller with dual rotation directions and capable of controlling the timing at which the rotation direction of the impeller is switched.
- 2. Description of the Related Art
- A conventional cooling fan generally has a fan frame having a base disposed therein. The base is coupled with a motor for driving an impeller to rotate. Generally, the base is connected to the fan frame at an air outlet via a plurality of ribs. When the impeller drives the air to pass through the air outlet, the ribs tend to hinder the air from entering the conventional cooling fan, thus decreasing the performance of the conventional cooling fan.
- In light of this problem, referring to
FIG. 1 , Taiwanese Patent No. 488497 discloses an apparatus for increasing air pressure and guiding airflows of the conventional cooling fan. Theapparatus 9 includes an airflow guidingdevice 91 resembling blades (which is also known as stationary blades). The airflow guidingdevice 91 may be disposed at an air outlet of the conventional cooling fan opposing to a plurality ofblades 92 of the conventional cooling fan. In such an arrangement, when theblades 92 drive the air to pass through the air outlet of the conventional cooling fan, the airflow guidingdevice 91 may increase the pressure of the air flowing out of the conventional cooling fan. - Taiwanese Patent No. M388570 discloses another conventional cooling fan with dual rotation directions. The conventional cooling fan includes a blade unit, an electric machinery and a controller. The controller can control the blade unit to rotate in a forward or reverse direction via the electric machinery, thereby performing the cooling and dust exhaustion operations of the conventional cooling fan.
- When the conventional cooling fan rotates in a forward direction for cooling purpose, the
apparatus 9 does increase the air pressure of the air outlet of the conventional cooling fan. However, when the conventional cooling fan rotates in a reverse direction for dust exhaustion, the air outlet of the conventional cooling fan will become an entrance of airflows and an air inlet of the conventional cooling fan will become an exit of airflows. Since the air inlet of the conventional cooling fan is not designed with any structure capable of increasing the pressure of the air passing therethrough, the dust exhaustion will not be performed in an efficient way due to the small air pressure. In overall, theapparatus 9 provides the conventional cooling fan different air-driving effects when the conventional cooling fan rotates in different direction. For example, theapparatus 9 can drive the air in a larger strength when the conventional cooling fan rotates in the forward direction for cooling purpose, but drives the air in a relatively small strength when the conventional cooling fan rotates in the reverse direction for dust exhaustion. This results in poorer performance in dust exhaustion. - It is therefore the primary objective of this invention to provide a cooling fan with dual rotation directions which provides almost the same air-driving effect when the cooling fan rotates in different directions.
- It is another objective of this invention to provide a cooling fan with dual rotation directions that, based on almost the same air-driving effect in different rotation directions, can be mounted on an electronic product in a flexible way to achieve assembly convenience.
- The invention discloses a cooling fan with dual rotation directions, which includes a fan frame unit, a driving control unit and an impeller. The fan frame unit has an air channel having first and second air-guiding openings on two sides of the air channel. A base is disposed between the first and second air-guiding openings. A first stationary blade unit is disposed at the first air-guiding opening and a second stationary blade unit is disposed at the second air-guiding opening. The driving control unit has a stator, a driving circuit and a rotation direction control circuit, wherein the stator is disposed on the base of the fan frame unit and the driving circuit is electrically connected to the stator and the rotation direction control circuit. The impeller is rotatably coupled with the stator of the driving control unit.
- The present invention will become more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
-
FIG. 1 shows a diagram of an apparatus for increasing air pressure and guiding airflows of a conventional cooling fan. -
FIG. 2 shows an exploded diagram of a cooling fan with dual rotation directions according to a preferred embodiment of the invention. -
FIG. 3 shows a side cross-sectional diagram of the cooling fan with dual rotation directions of the invention. -
FIG. 4 shows an implementation of a fan frame unit of the cooling fan with dual rotation directions of the invention. -
FIG. 5 shows a side cross-sectional diagram of the cooling fan with dual rotation directions of the invention, in which the cooling fan includes a first stationary blade unit and a second stationary blade unit comprising a plurality of stationary blades having a different oblique angle from a plurality of stationary blades of the first stationary blade unit. -
FIG. 6 shows a side cross-sectional diagram of the cooling fan with dual rotation directions of the invention, in which both the first and second stationary blade units have an air-guiding portion. - In the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the term “first”, “second”, “third”, “fourth”, “inner”, “outer” “top”, “bottom” and similar terms are used hereinafter, it should be understood that these terms refer only to the structure shown in the drawings as it would appear to a person viewing the drawings, and are utilized only to facilitate describing the invention.
- Referring to
FIGS. 2 and 3 , a cooling fan with dual rotation directions of the invention at least includes afan frame unit 1, adriving control unit 2 and animpeller 3. Thefan frame unit 1 is coupled with thedriving control unit 2 when thedriving control unit 2 is disposed in thefan frame unit 1. Theimpeller 3 is rotatably coupled with thedriving control unit 2 such that thedriving control unit 2 can control theimpeller 3 to rotate in a forward or reverse direction. - The
fan frame unit 1 consists of at least a hollow frame and has anair channel 11. Theair channel 11 has a first air-guidingopening 111 and a second air-guidingopening 112 on two sides thereof, with abase 12 disposed between the first air-guidingopening 111 and second air-guidingopening 112. The first air-guidingopening 111 has a firststationary blade unit 13 disposed thereat and the second air-guidingopening 112 has a secondstationary blade unit 14 disposed thereat. - In the embodiment, the
fan frame unit 1 consists of a first frame 1 a and asecond frame 1 b. The first frame 1 a andsecond frame 1 b may be detachably assembled together so that the interior spaces of the first frame 1 a andsecond frame 1 b may communicate with each other to form theair channel 11. The first air-guidingopening 111 is located in the first frame 1 a and the second air-guidingopening 112 is located in thesecond frame 1 b. Thebase 12 is located in the first frame 1 a. Both the firststationary blade unit 13 and secondstationary blade unit 14 consist of a plurality of stationary blades. The firststationary blade unit 13 is disposed in the first frame 1 a and adjoins the first air-guidingopening 111, and the secondstationary blade unit 14 is disposed in thesecond frame 1 b and adjoins the second air-guidingopening 112. Thebase 12 is coupled with an inner circumferential wall of the first frame 1 a via the stationary blades of the firststationary blade unit 13. - Although the
fan frame unit 1 is shown to consist of the first frame 1 a andsecond frame 1 b, more than two frames can be used to form thefan frame unit 1. For example, referring toFIG. 4 , thefan frame unit 1 may consist of the first frame 1 a, thesecond frame 1 b and a third frame 1 c, with the third frame 1 c sandwiched between the first frame 1 a andsecond frame 1 b. Therefore, thefan frame unit 1 is allowed to comprise at least one hollow frame if it won't affect the assembly of thedriving control unit 2 andimpeller 3, as can be readily appreciated by one skilled in this art. - The
driving control unit 2 has astator 21, adriving circuit 22 and a rotationdirection control circuit 23. Thestator 21 is disposed on thebase 12 of thefan frame unit 1 and rotatably coupled with theimpeller 3. Thedriving circuit 22 is electrically connected to thestator 21. The rotationdirection control circuit 23 is electrically connected to thedriving circuit 22. Based on this, the rotationdirection control circuit 23 can control the forward or reverse rotation of theimpeller 3 via thedriving circuit 22. The drivingcircuit 22 and rotationdirection control circuit 23 can be integrated into an integrated chip (IC). - The
impeller 3 has ahub 31 rotatably coupled with thestator 21 of the drivingcontrol unit 2. Thehub 31 has a plurality ofvanes 32 on an outer circumferential wall thereof. Thevanes 32 drive the air to pass through the first air-guidingopening 111 and second air-guidingopening 112 when the drivingcontrol unit 2 drives thehub 31 to rotate (one skilled in the art may readily appreciate that the drivingcontrol unit 2 drives thehub 31 to rotate under alternating magnetic fields, so it is not described herein again). - When the cooling fan with dual rotation directions of the invention is in use, the driving
control unit 2 may control thehub 31 to rotate in the forward or reverse direction. Thus, one of the first air-guidingopening 111 and second air-guidingopening 112 will serve as an air inlet, depending on the rotation direction of the cooling fan. Based on dual rotation directions of the cooling fan, both the first air-guidingopening 111 and second air-guidingopening 112 can serve as an air inlet and an air outlet. For example, both the first air-guidingopening 111 and second air-guidingopening 112 may serve the cooling purpose. Specifically, the cooling fan may drive and guide the internal air of thefan frame unit 1 to a heat-emitting source for cooling operation when the cooling fan rotates in the forward direction, as well as to another heat-emitting source for cooling operation when the cooling fan rotates in the reverse direction. In another application, the first air-guidingopening 111 may serve the cooling purpose and the second air-guidingopening 112 may serve the dust exhaustion purpose. - For example, the cooling fan with dual rotation directions of the invention may be mounted on an electronic product when the first air-guiding
opening 111 of thefan frame unit 1 faces a predetermined portion of the electronic product where heat is constantly emitted. When the electronic product emits the heat during operation thereof, the rotationdirection control circuit 23 of the drivingcontrol unit 2 can send a control signal to the drivingcircuit 22 which, in turn, drives thestator 21 to generate magnetic fields upon receipt of the control signal. The generated magnetic fields can drive theimpeller 3 to rotate in a first direction (which can be the reverse or forward direction), drawing the external air into thefan frame unit 1 via the second air-guidingopening 112. Theimpeller 3 guides the drawn air to travel in theair channel 11 and the internal air of thefan frame unit 1 is then exhausted via the first air-guidingopening 111 and guided to the predetermined portion of the electronic product for cooling operation. In this embodiment, the first air-guidingopening 111 serves as an air outlet and the second air-guidingopening 112 serve as an air inlet. - However, when the cooling fan of the invention operates in a long time, dust contained in the air will accumulate in the
fan frame unit 1. For example, the dust may remain on the first air-guidingopening 111, second air-guidingopening 112 orvanes 32 of theimpeller 3 and so on. At this point, the rotationdirection control circuit 23 of the drivingcontrol unit 2 can send another control signal to the drivingcircuit 22 which, in turn, drives thestator 21 to generate magnetic fields. Due to the switch of control signal, the generated magnetic fields will drive theimpeller 3 to rotate in a second direction opposite to the first direction, drawing the external air into thefan frame unit 1 via the first air-guidingopening 111. Theimpeller 3 guides the drawn air to travel in theair channel 11 and the internal air of thefan frame unit 1 is then exhausted via the second air-guidingopening 112. In this way, the dust accumulated in thefan frame unit 1 can be blown away by the airflows. In this embodiment, the first air-guidingopening 111 serves as an air inlet and the second air-guidingopening 112 serve as an air outlet. - The cooling fan with dual rotation directions of the invention is characterized in that the first air-guiding
opening 111 of thefan frame unit 1 is provided with the firststationary blade unit 13 and the second air-guidingopening 112 of thefan frame unit 1 is provided with the secondstationary blade unit 14. Thus, the firststationary blade unit 13 may increase the pressure of the air passing through the first air-guidingopening 111 when the first air-guidingopening 111 serves as an air outlet. Similarly, the secondstationary blade unit 14 may increase the pressure of the air passing through the second air-guidingopening 112 when the second air-guidingopening 112 serves as an air outlet. - However, when the first air-guiding
opening 111 serves as an air outlet, the secondstationary blade unit 14 disposed at the second air-guidingopening 112 will hinder the air from entering thefan frame unit 1. Similarly, when the second air-guidingopening 112 serves as an air outlet, the firststationary blade unit 13 disposed at the first air-guidingopening 111 will also hinder the air from entering thefan frame unit 1. Although the firststationary blade unit 13 hinders the air from entering thefan frame unit 1 when the second air-guidingopening 112 serves as an air outlet, the firststationary blade unit 13 does increase the pressure of the air flowing out of thefan frame unit 1 at the same moment. Similarly, although the secondstationary blade unit 14 hinders the air from entering thefan frame unit 1 when the first air-guidingopening 111 serves as an air outlet, the secondstationary blade unit 14 does increase the pressure of the air flowing out of thefan frame unit 1 at the same moment. Therefore, the cooling fan of the invention can provide almost the same air-driving effect at the first air-guidingopening 111 and second air-guidingopening 112 regardless of rotation direction of theimpeller 3. In other words, the cooling fan with dual rotation directions of the invention can provide a heat-emitting source almost the same cooling effect at the first air-guidingopening 111 and second air-guidingopening 112. Alternatively, when the first air-guidingopening 111 serves the cooling purpose and the second air-guidingopening 112 serves the dust exhaustion purpose, the cooling operation will be as efficient as the dust exhaustion operation. This differs from the conventional cooling fan that provides a better cooling efficiency than the dust exhaustion efficiency. Although the first air-guidingopening 111 and second air-guidingopening 112 of the cooling fan may not drive the internal air of thefan frame unit 1 in a most efficient way, they do provide the required air-driving effect. - More importantly, since the cooling fan with dual rotation directions of the invention provides almost the same air-driving effect at the first air-guiding
opening 111 and second air-guidingopening 112 regardless of rotation direction of the cooling fan, the first air-guidingopening 111 or the second air-guidingopening 112 can be chosen to face the electronic product while mounting the cooling fan on the electronic product. In this way, the cooling fan of the invention allows either air-guiding opening to face the electronic product while mounting the cooling fan on the electronic product. This prevents the cooling fan from being mounted on the electronic product in an incorrect way. Therefore, it will not be required to remount the cooling fan on the electronic product due to the incorrect mounting of the cooling fan, thus improving the assembly convenience of the cooling fan. - The cooling fan with dual rotation directions of the invention may include one or more of the following secondary features for further improvement, as described below.
- The first
stationary blade unit 13 is disposed in a different direction from the secondstationary blade unit 14 in an axial direction of theimpeller 3. Specifically, take the cooling fans shown inFIGS. 3 and 6 as an example, the firststationary blade unit 13 is disposed at the first air-guidingopening 111 in a way that the stationary blades of the firststationary blade unit 13 extend from bottom-right to top-left corners in cross sections thereof, whereas the secondstationary blade unit 14 is disposed at the second air-guidingopening 112 in a way that the stationary blades of the secondstationary blade unit 14 extend from bottom-left to top-right corners in cross sections thereof. In other words, the firststationary blade unit 13 extends in an opposite direction to the secondstationary blade unit 14 in the axial direction of theimpeller 3. One skilled in this art may readily appreciate that the oblique angle of the stationary blades of the firststationary blade unit 13 and secondstationary blade unit 14 with respect to the axial direction of theimpeller 3 may be properly adjusted according to the angle of thevanes 32 of the impeller 3 (for example, the oblique angle of the stationary blades of the firststationary blade unit 13 is different from that of the stationary blades of the secondstationary blade unit 14 in bothFIGS. 3 and 5 ). Therefore, the structure of the firststationary blade unit 13 and secondstationary blade unit 14 may be designed in a flexible way that conforms to the angle of thevanes 32 of theimpeller 3 for achieving best air-driving effect at the first air-guidingopening 111 and second air-guidingopening 112, regardless of rotation direction of the cooling fan. Alternatively, based on the fact that the firststationary blade unit 13 is disposed in the different direction from the secondstationary blade unit 14 in the axial direction of theimpeller 3, the stationary blades of the firststationary blade unit 13 can have the same oblique angle as those of the secondstationary blade unit 14. This allows the firststationary blade unit 13 and secondstationary blade unit 14 to be manufactured using a single mold for cost reduction. - Referring to
FIG. 6 , the firststationary blade unit 13 may further include an air-guidingportion 131 at a center thereof. Based on this, when the first air-guidingopening 111 serves as an air inlet drawing the external air into theair channel 11, the air-guidingportion 131 may efficiently guide the external air to pass through the firststationary blade unit 13. Similarly, the secondstationary blade unit 14 may further include an air-guidingportion 141 at a center thereof. Based on this, when the second air-guidingopening 112 serves as an air inlet drawing the external air into theair channel 11, the air-guidingportion 141 may efficiently guide the external air to pass through the secondstationary blade unit 14. With the arrangement of the air-guidingportions - In conclusion, the cooling fan with dual rotation directions of the invention does provide almost the same air-driving effect at both first and second air-guiding
openings openings - Although the invention has been described in detail with reference to its presently preferable embodiment, it will be understood by one of ordinary skill in the art that various modifications can be made without departing from the spirit and the scope of the invention, as set forth in the appended claims.
Claims (12)
1. A cooling fan with dual rotation directions, comprising:
a fan frame unit having an air channel with first and second air-guiding openings on two sides of the air channel, wherein a base is disposed between the first and second air-guiding openings, a first stationary blade unit is disposed at the first air-guiding opening and a second stationary blade unit is disposed at the second air-guiding opening;
a driving control unit having a stator, a driving circuit and a rotation direction control circuit, wherein the stator is disposed on the base of the fan frame unit, the driving circuit is electrically connected to the stator and the rotation direction control circuit; and
an impeller rotatably coupled with the stator of the driving control unit.
2. The cooling fan with dual rotation directions as claimed in claim 1 , wherein the fan frame unit comprises a first frame and a second frame detachably assembled to the first frame to form the air channel, the first air-guiding opening is located in the first frame and the second air-guiding opening is located in the second frame, and the base is located in the first frame.
3. The cooling fan with dual rotation directions as claimed in claim 2 , wherein both the first stationary blade unit and the second stationary blade unit comprise a plurality of stationary blades.
4. The cooling fan with dual rotation directions as claimed in claim 3 , wherein the base is coupled with an inner circumferential wall of the first frame via the stationary blades of the first stationary blade unit.
5. The cooling fan with dual rotation directions as claimed in claim 2 , wherein the fan frame unit further comprises a third frame sandwiched between the first frame and the second frame.
6. The cooling fan with dual rotation directions as claimed in claim 1 , wherein the first stationary blade unit is disposed in a different direction from the second stationary blade unit in a way that the first and second stationary blade units extend in opposite directions from each other in an axial direction of the impeller.
7. The cooling fan with dual rotation directions as claimed in claim 1 , wherein an oblique angle of the stationary blades of the first stationary blade unit with respect to an axial direction of the impeller is different from that of the stationary blades of the second stationary blade unit.
8. The cooling fan with dual rotation directions as claimed in claim 6 , wherein an oblique angle of the stationary blades of the first stationary blade unit with respect to the axial direction of the impeller is different from that of the stationary blades of the second stationary blade unit.
9. The cooling fan with dual rotation directions as claimed in claim 6 , wherein an oblique angle of the stationary blades of the first stationary blade unit with respect to the axial direction of the impeller is the same as that of the stationary blades of the second stationary blade unit.
10. The cooling fan with dual rotation directions as claimed in claim 1 , wherein the first stationary blade unit further comprises an air-guiding portion at a center thereof.
11. The cooling fan with dual rotation directions as claimed in claim 1 , wherein the second stationary blade unit further comprises an air-guiding portion at a center thereof.
12. The cooling fan with dual rotation directions as claimed in claim 1 , wherein the driving circuit and the rotation direction control circuit are integrated into an integrated chip.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW100105671 | 2011-02-21 | ||
TW100105671A TW201235568A (en) | 2011-02-21 | 2011-02-21 | Cooling fan with dual rotation function |
Publications (1)
Publication Number | Publication Date |
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US20120213650A1 true US20120213650A1 (en) | 2012-08-23 |
Family
ID=44848698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/076,565 Abandoned US20120213650A1 (en) | 2011-02-21 | 2011-03-31 | Cooling Fan with Dual Rotation Directions |
Country Status (3)
Country | Link |
---|---|
US (1) | US20120213650A1 (en) |
CN (2) | CN202023747U (en) |
TW (1) | TW201235568A (en) |
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US20190024675A1 (en) * | 2017-07-20 | 2019-01-24 | Quanta Computer Inc. | Fan front intake for server fan module |
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TW201235568A (en) * | 2011-02-21 | 2012-09-01 | Sunonwealth Electr Mach Ind Co | Cooling fan with dual rotation function |
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Also Published As
Publication number | Publication date |
---|---|
CN202023747U (en) | 2011-11-02 |
CN102644610A (en) | 2012-08-22 |
TW201235568A (en) | 2012-09-01 |
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Legal Events
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AS | Assignment |
Owner name: SUNONWEALTH ELECTRIC MACHINE INDUSTRY CO., LTD., T Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LEE, DON-CHENG;LI, MING-TSUNG;NGUYEN, NGUYEN;AND OTHERS;REEL/FRAME:026053/0619 Effective date: 20110223 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |