US20110308776A1 - Dust-disposal heat-dissipation device with double cooling fans - Google Patents
Dust-disposal heat-dissipation device with double cooling fans Download PDFInfo
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- US20110308776A1 US20110308776A1 US12/817,730 US81773010A US2011308776A1 US 20110308776 A1 US20110308776 A1 US 20110308776A1 US 81773010 A US81773010 A US 81773010A US 2011308776 A1 US2011308776 A1 US 2011308776A1
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- Prior art keywords
- cooling fan
- cooling
- fin set
- control module
- section
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
- H01L23/3672—Foil-like cooling fins or heat sinks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
- H01L23/427—Cooling by change of state, e.g. use of heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0275—Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a heat dissipation device having double cooling fans, and in particular to the one with dust removal function.
- Computer components often exude a large amount of heat during operation of the computer system. In order to keep the components within their safe operating temperatures, heat generated by the components must be dissipated. Varied cooling apparatuses are used to remove heat from computer components.
- Taiwan Patent No. 371497 is exemplary of patent directed to a dual-fan heat dissipation device of the type to which this invention is directed.
- the dissipation device mainly includes two cooling fans and a fan control module for controlling rotation of the cooling fans.
- One of the fans is arranged to draw cooler air into a computer chassis from outside while the other fan is to exhaust hot air out of the computer chassis.
- the fan control module is configured to enable the fans to run in turn. That is, when one fan rotates, the other stops, and they take turns. In this manner, resonance effect, which is often caused by a dual-fan device in a computer system, may be reduced, and thereby the noise is diminished.
- the dual-fan heat dissipation device as described in that patent has no dust removal function.
- the present invention is directed to a dual-fan heat dissipation device with a dust removal function.
- the heat dissipation device generally includes a fin set, a cover, a first cooling fan, a second cooling fan and a control module.
- the fin set includes a plurality of cooling fins alongside each other.
- the cover has a main plate which covers a top of the fin set.
- the first and second cooling fans are disposed on the cover. Upon being actuated, the first cooling fan is able to generate airflow toward a front top section of the fin set. Likewise, the second cooling fan is able to generate airflow toward a rear top section of the fin set upon being actuated.
- the control module is configured to either actuate the first and second fans upon receiving a working signal or execute the following steps upon receiving a dust-disposal signal:
- the first cooling fan generates airflow to have a heat exchange with the cooling fins of the fin set, as well as to remove dust from the fin set and the second cooling fan.
- the second cooling fan is able to generate airflow to cool the fin set and remove dust from the fin set and the first cooling fan simultaneously during the time period of step (b).
- the first and second cooling fans each rotates in the same direction without reverse rotation.
- control module further executes the step of simultaneously turning on the first and second cooling fans.
- the control module is shifting from step (a) to the step (b)
- a situation where both the first and second cooling fans are both shut down can be avoided.
- the fin set has a substantially flat section, a front inclined section and a rear inclined section at a bottom thereof.
- the flat section is defined for contacting a heat source.
- the front and rear inclined sections are located at opposite sides of the flat section.
- the front inclined section faces obliquely toward the first cooling fan.
- the rear inclined section faces obliquely toward the second cooling fan.
- the front and rear inclined sections are slanted toward the flat section. As such, the rear inclined section is able to direct air toward the second cooling fan in step (a) and the front inclined section toward the first cooling fan in step (b).
- FIG. 1 is a perspective view of a circuit board and an embodiment of a heat dissipation device in according with the present invention
- FIG. 2 is another perspective view, partially exploded to show details of a bottom of a fin set of the heat dissipation device
- FIG. 3 is a cross-sectional view of the heat dissipation device, showing the route of airflow when the two cooling fans are both in working states;
- FIG. 4 is another cross-sectional view of the heat dissipation device, showing the route of airflow when only the left fan is in the working state;
- FIG. 5 is a view similar to FIG. 4 , showing the route of airflow when only the right cooling fan is in the working state.
- FIGS. 1 and 2 a heat dissipation device is illustrated in FIGS. 1 and 2 in accordance with the preferred embodiment of the invention.
- the heat dissipation device includes a first cooling fan 1 , a second cooling fan 2 , a cover 3 , a fin set 4 and a control module 5 .
- the control module 5 is integrated on a printed circuit board 8 .
- the fin set 4 includes a plurality of cooling fins 40 spaced apart in a transverse direction X. Channels are defined between adjacent cooling fins 40 .
- the cover 3 includes a main plate 30 and two baffles 31 extending downward from opposite sides of the main plate 30 .
- the main plate 30 covers a top surface of the fin set 4 and has two inlets 301 and 302 defined therein and spaced apart in a longitudinal direction Y.
- the first cooling fan 1 is mounted in the inlet 301 of the cover 3 . Upon being actuated, the first cooling fan 1 is able to generate airflow toward a front top section of the fin set 4 .
- the second cooling fan 2 is mounted in the other outlet 302 of the cover 3 and is able to generate airflow toward a rear top section of the fin set 4 upon being actuated.
- the control module 5 is generally composed of a micro controller and some transistor switch circuits, as will be described later.
- the fin set 4 has a substantially flat section 41 at the bottom thereof for contacting a heat source 6 .
- the heat source 6 includes a heat conductive block 61 and heat absorption sections of some heat pipes 7 .
- the heat source 6 may be a CPU, a GPU or other heat-generating components.
- the flat section 41 of the fin set 4 contacts the heat source 6 .
- the heat conductive block 61 of the heat source 6 abuts against a chip 80 of the circuit board 8 . Therefore, heat generated by the chip 80 can be transferred by the heat conductive block 61 and the heat pipes 7 to the fin set 4 for further dissipation.
- the circuit board 8 is a computer display card inside a computer host.
- the chip 80 is a GPU integrated on the computer display card.
- the control module 5 is integrated on the circuit board 8 and is coupled to the first and second cooling fans 1 , 2 for power control over the two cooling fans 1 , 2 in order to selectively turn on or off the first and second cooling fans 1 , 2 .
- the control module 5 is configured to either actuate the first and second fans 1 , 2 upon receiving a working signal or execute the following steps upon receiving a dust-disposal signal:
- each of the steps (a) and (b) is executed for a predetermined period of time, such as dozens of seconds or minutes.
- a push by a user via a quick launch button of a keyboard of the computer host enables the computer host to generate a working signal.
- a working signal may also be generated by a program which drives the computer host to generate the same.
- the computer host may be required to generate a working signal when a temperature inside the computer host is detected by a temperature sensor and the temperature value is above a criterion.
- a dust-disposal signal may be generated by the computer host by means of a computer program.
- the computer host may be required to generate a dust-disposal signal once a total operating time value of the first and second cooling fans is up to a predetermined standard value.
- the control module 5 upon receiving the working signal, the control module 5 immediately actuates the first and second cooling fans 1 , 2 for heat dissipation. That is, the control module 5 allows the first and second cooling fans 1 , 2 to be powered in such a way that the first and second cooling fans 1 , 2 are able to generate airflow, as shown by arrows in FIG. 3 . In this state, the first and second cooling fans 1 , 2 are operating for heat dissipation from the circuit board 8 and the chip 80 . As can be seen from arrows in FIG.
- particles A such as dust or feather dust
- a surface of the fin set 4 namely a front top edge 40 a and a rear top edge 40 b , which face the direction of the airflow.
- particles (not shown) are remained on a surface of the fin set 4 , namely a front top edge 40 a and a rear top edge 40 b , which face the direction of the airflow.
- particles (not shown) are remained on the surfaces of the fan blades of the first and second cooling fans 1 , 2 too.
- step (a) the first cooling fan 1 is turned on and working while the second cooling fan 2 is turned off and stops working, under the control of the control module 5 .
- step (b) the first cooling fan 1 generates airflow as shown by arrows in FIG. 4 .
- those particles A accumulated on the rear top edge 40 b of the fin set 4 as well as the particles which are on the blades of the second cooling fan 2 are blew off by the airflow of the first cooling fan 1 .
- the first cooling fan 1 in the meanwhile, runs for heat dissipation.
- step (b) the first cooling fan 1 is turned off and stops working under the control of the control module 5 .
- the second cooling fan 2 is turned on by the control module 5 and starts to run to generate airflow as shown by arrows in FIG. 5 .
- those particles A accumulated on the front top edge 40 a of the fin set 4 as well as the particles which are on the blades of the first cooling fan 1 are blew off by the airflow of the second cooling fan 2 .
- the second cooling fan 2 in the meanwhile, runs for heat dissipation.
- the control module 5 receives the signal and then executes the steps (a) and (b) to enable the first and second cooling fans 1 , 2 to remove the dust in turn. If necessary, the control module 5 can further executes another round of the steps (a) and (b) each for a while and repeats that over and over again. Anyhow, it can be understood that, by virtue of the control of the control module 5 over the first and second cooling fans 1 , 2 , the fin set 4 as well as the first and second cooling fans 1 , 2 can be kept clean without dust accumulation, which has significant positive effect on the heat-dissipation-efficiency of the entire heat dissipation device.
- the two cooling fans 1 , 2 both rotate in a rotational direction.
- the control module 5 drives the first and second cooling fans 1 , 2 to continue rotating in the same rotational direction.
- the control module 5 may be further configured to execute the step of simultaneously turning on the first and second cooling fans 1 , 2 , after the step (a) but before the step (b), so as to prevent the two cooling fans 1 , 2 from shutting down at the same time.
- control module 5 is integrated on the computer display card; however, in other embodiments, it may also be integrated on a mother board of the computer host. In either way, the resources of GPU on the display card or CPU on the mother board can be employed to replace the micro controller of the control module 5 .
- control module 5 may be an independent circuit module.
- the fin set 4 has the bottom including a front inclined section 42 and a rear inclined section 43 on opposite sides of the flat section 41 .
- the front and rear inclined sections 42 , 43 are slanted toward the flat section 41 , as shown in FIG. 3 .
- the cooling fins 40 of the fin set 4 are placed side by side and joined together.
- Each cooling fin 40 substantially fabricated by metal punching process, is made of copper or aluminum.
- Each cooling fin 40 includes a base plate 401 together with a middle folded edge 402 , a front oblique folded edge 403 and a rear oblique folded edge 404 each extending from a bottom of the base plate 401 .
- Those middle folded edges 402 of the cooling fins 40 together define the flat section 41 of the fin set 4 .
- Those front oblique folded edges 403 of the cooling fins 40 together define the front inclined section 42 of the fin set 4 .
- those rear oblique folded edges 404 of the cooling fins 40 together define the rear inclined section 43 of the fin set 4 .
- the front inclined section 42 of the fin set 4 faces obliquely towards the first cooling fan 1 while the rear inclined section 43 of the fin set 4 faces obliquely toward the second cooling fan 2 .
- the rear inclined section 43 of the fin set 4 is constructed to guide airflow towards the second cooling fan 2 .
- the front inclined section 42 of the fin set 4 is to guide airflow towards the first cooling fan 1 , as depicted in FIG. 5 .
- the front and rear inclined sections 42 , 43 of the fin set 4 may be deleted from the entire device without substantially affecting performance.
Abstract
A heat dissipation device includes a fin set, a cover, a first fan, a second fan and a control module. The fin set includes a plurality of cooling fins transversely spaced apart and has a substantially flat section at a bottom thereof for contacting a heat source. The cover includes a plate which covers a top surface of the fin set and has two inlets longitudinally spaced apart. The first and second fans are mounted in the two inlets of the cover for generating airflow toward front and rear top sections of the fin set respectively. Additionally, the control module is configured to either actuate the first and second fans upon receiving a working signal or execute the following steps upon receiving a dust-disposal signal: (a). turning on the first cooling fan and turn off the second cooling fan simultaneously for a period of time; and (b). turning on the second cooling fan and turn off the first cooling fan simultaneously for a period of time.
Description
- 1. Field of Invention
- The present invention relates to a heat dissipation device having double cooling fans, and in particular to the one with dust removal function.
- 2. Related Prior Art
- Computer components often exude a large amount of heat during operation of the computer system. In order to keep the components within their safe operating temperatures, heat generated by the components must be dissipated. Varied cooling apparatuses are used to remove heat from computer components.
- Taiwan Patent No. 371497 is exemplary of patent directed to a dual-fan heat dissipation device of the type to which this invention is directed. The dissipation device mainly includes two cooling fans and a fan control module for controlling rotation of the cooling fans. One of the fans is arranged to draw cooler air into a computer chassis from outside while the other fan is to exhaust hot air out of the computer chassis. The fan control module is configured to enable the fans to run in turn. That is, when one fan rotates, the other stops, and they take turns. In this manner, resonance effect, which is often caused by a dual-fan device in a computer system, may be reduced, and thereby the noise is diminished. However, the dual-fan heat dissipation device as described in that patent has no dust removal function.
- Another heat dissipation device is described in U.S. Pat. No. 7,630,201 and includes two fans which take turns to rotate in the opposite direction to keep a heat sink cool. However, the fans are not able to run together at the same time for cooling the heat sink, and therefore the heat dissipation efficiency of the same is limited.
- Broadly stated, the present invention is directed to a dual-fan heat dissipation device with a dust removal function. The heat dissipation device generally includes a fin set, a cover, a first cooling fan, a second cooling fan and a control module. The fin set includes a plurality of cooling fins alongside each other. The cover has a main plate which covers a top of the fin set. The first and second cooling fans are disposed on the cover. Upon being actuated, the first cooling fan is able to generate airflow toward a front top section of the fin set. Likewise, the second cooling fan is able to generate airflow toward a rear top section of the fin set upon being actuated. The control module is configured to either actuate the first and second fans upon receiving a working signal or execute the following steps upon receiving a dust-disposal signal:
- (a). turning on the first cooling fan and turn off the second cooling fan simultaneously for a period of time; and
- (b). turning on the second cooling fan and turn off the first cooling fan simultaneously for a period of time.
- By virtue of the control module, during the time period of step (a), the first cooling fan generates airflow to have a heat exchange with the cooling fins of the fin set, as well as to remove dust from the fin set and the second cooling fan. In like manner, the second cooling fan is able to generate airflow to cool the fin set and remove dust from the fin set and the first cooling fan simultaneously during the time period of step (b). In particular, in the aforementioned steps, the first and second cooling fans each rotates in the same direction without reverse rotation.
- Preferably, after the step (a) but before the step (b), the control module further executes the step of simultaneously turning on the first and second cooling fans. In this way, while the control module is shifting from step (a) to the step (b), a situation where both the first and second cooling fans are both shut down can be avoided.
- In addition, the fin set has a substantially flat section, a front inclined section and a rear inclined section at a bottom thereof. The flat section is defined for contacting a heat source. The front and rear inclined sections are located at opposite sides of the flat section. The front inclined section faces obliquely toward the first cooling fan. The rear inclined section faces obliquely toward the second cooling fan. Besides, the front and rear inclined sections are slanted toward the flat section. As such, the rear inclined section is able to direct air toward the second cooling fan in step (a) and the front inclined section toward the first cooling fan in step (b).
- Further features and advantages of the present invention will be appreciated by review of the following detailed description of the invention.
- The invention is illustrated by the accompanying drawings in which corresponding parts are identified by the same numerals and in which:
-
FIG. 1 is a perspective view of a circuit board and an embodiment of a heat dissipation device in according with the present invention; -
FIG. 2 is another perspective view, partially exploded to show details of a bottom of a fin set of the heat dissipation device; -
FIG. 3 is a cross-sectional view of the heat dissipation device, showing the route of airflow when the two cooling fans are both in working states; -
FIG. 4 is another cross-sectional view of the heat dissipation device, showing the route of airflow when only the left fan is in the working state; and -
FIG. 5 is a view similar toFIG. 4 , showing the route of airflow when only the right cooling fan is in the working state. - Turning in detail to the drawings, a heat dissipation device is illustrated in
FIGS. 1 and 2 in accordance with the preferred embodiment of the invention. The heat dissipation device includes a first cooling fan 1, asecond cooling fan 2, acover 3, afin set 4 and acontrol module 5. Note that, in this embodiment, thecontrol module 5 is integrated on aprinted circuit board 8. - As shown in
FIG. 1 , thefin set 4 includes a plurality of cooling fins 40 spaced apart in a transverse direction X. Channels are defined betweenadjacent cooling fins 40. Thecover 3 includes amain plate 30 and twobaffles 31 extending downward from opposite sides of themain plate 30. Themain plate 30 covers a top surface of thefin set 4 and has twoinlets inlet 301 of thecover 3. Upon being actuated, the first cooling fan 1 is able to generate airflow toward a front top section of thefin set 4. Similarly, thesecond cooling fan 2 is mounted in theother outlet 302 of thecover 3 and is able to generate airflow toward a rear top section of thefin set 4 upon being actuated. - The
control module 5 is generally composed of a micro controller and some transistor switch circuits, as will be described later. - As shown in
FIG. 2 , thefin set 4 has a substantiallyflat section 41 at the bottom thereof for contacting aheat source 6. In this example, theheat source 6 includes a heatconductive block 61 and heat absorption sections of someheat pipes 7. In another example, theheat source 6 may be a CPU, a GPU or other heat-generating components. - As shown in
FIG. 3 , theflat section 41 of the fin set 4 contacts theheat source 6. The heatconductive block 61 of theheat source 6 abuts against achip 80 of thecircuit board 8. Therefore, heat generated by thechip 80 can be transferred by the heatconductive block 61 and theheat pipes 7 to the fin set 4 for further dissipation. - As can be seen in
FIGS. 3-5 , thecircuit board 8 is a computer display card inside a computer host. Thechip 80 is a GPU integrated on the computer display card. Thecontrol module 5 is integrated on thecircuit board 8 and is coupled to the first andsecond cooling fans 1, 2 for power control over the two coolingfans 1, 2 in order to selectively turn on or off the first andsecond cooling fans 1, 2. Most importantly, thecontrol module 5 is configured to either actuate the first andsecond fans 1, 2 upon receiving a working signal or execute the following steps upon receiving a dust-disposal signal: - (a). turning on the first cooling fan 1 and turn off the
second cooling fan 2 simultaneously; and - (b). turning on the
second cooling fan 2 and turn off the first cooling fan 1 simultaneously. - It is noted that each of the steps (a) and (b) is executed for a predetermined period of time, such as dozens of seconds or minutes.
- There are a number of ways to generate the working signal. For instance, a push by a user via a quick launch button of a keyboard of the computer host enables the computer host to generate a working signal. In another way, a working signal may also be generated by a program which drives the computer host to generate the same. In yet another way, the computer host may be required to generate a working signal when a temperature inside the computer host is detected by a temperature sensor and the temperature value is above a criterion.
- Similarly, there are a number of ways to generate a dust-disposal signal. For instance, by a push of another button (such as a button special created for dust removal) on the computer host or another quick launch button. In another way, a dust-disposal signal may be generated by the computer host by means of a computer program. In yet another way, the computer host may be required to generate a dust-disposal signal once a total operating time value of the first and second cooling fans is up to a predetermined standard value.
- In any case, upon receiving the working signal, the
control module 5 immediately actuates the first andsecond cooling fans 1, 2 for heat dissipation. That is, thecontrol module 5 allows the first andsecond cooling fans 1, 2 to be powered in such a way that the first andsecond cooling fans 1, 2 are able to generate airflow, as shown by arrows inFIG. 3 . In this state, the first andsecond cooling fans 1, 2 are operating for heat dissipation from thecircuit board 8 and thechip 80. As can be seen from arrows inFIG. 3 , particles A, such as dust or feather dust, are remained on a surface of the fin set 4, namely a fronttop edge 40 a and a reartop edge 40 b, which face the direction of the airflow. Besides, on the surfaces of the fan blades of the first andsecond cooling fans 1, 2 are particles (not shown) too. - In particular, once the
control module 5 receives the dust-disposal signal, thecontrol module 5 executes the aforementioned steps (a) and (b) to cast out those particles. Firstly, in step (a), the first cooling fan 1 is turned on and working while thesecond cooling fan 2 is turned off and stops working, under the control of thecontrol module 5. At this time, the first cooling fan 1 generates airflow as shown by arrows inFIG. 4 . According to the direction of the airflow inFIG. 4 , those particles A accumulated on the reartop edge 40 b of the fin set 4 as well as the particles which are on the blades of thesecond cooling fan 2 are blew off by the airflow of the first cooling fan 1. Note that, in addition to the dust removal, the first cooling fan 1, in the meanwhile, runs for heat dissipation. - Secondly, in step (b), the first cooling fan 1 is turned off and stops working under the control of the
control module 5. However, thesecond cooling fan 2 is turned on by thecontrol module 5 and starts to run to generate airflow as shown by arrows inFIG. 5 . According to the direction of the airflow inFIG. 5 , those particles A accumulated on the fronttop edge 40 a of the fin set 4 as well as the particles which are on the blades of the first cooling fan 1 are blew off by the airflow of thesecond cooling fan 2. Also note that, in addition to the dust removal, thesecond cooling fan 2, in the meanwhile, runs for heat dissipation. - As described above, when the computer host generates the dust-disposal signal, the
control module 5 receives the signal and then executes the steps (a) and (b) to enable the first andsecond cooling fans 1, 2 to remove the dust in turn. If necessary, thecontrol module 5 can further executes another round of the steps (a) and (b) each for a while and repeats that over and over again. Anyhow, it can be understood that, by virtue of the control of thecontrol module 5 over the first andsecond cooling fans 1, 2, the fin set 4 as well as the first andsecond cooling fans 1, 2 can be kept clean without dust accumulation, which has significant positive effect on the heat-dissipation-efficiency of the entire heat dissipation device. - It should be noted that when being actuated by the
control module 5 to execute the regular heat dissipation process, the two coolingfans 1, 2 both rotate in a rotational direction. In addition to that, in response to the dust-disposal signal, thecontrol module 5 drives the first andsecond cooling fans 1, 2 to continue rotating in the same rotational direction. These greatly differ from the prior arts where the cooling fans are constructed to rotate reversely for dust removal purpose. - While the first and
second cooling fan 1, 2 are taking turns to run as mentioned in the steps (a) and (b), it may happen that the two coolingfans 1, 2 are shutting down simultaneously in a short time. This may happened due to a circuit delay, for example. Sometimes the result, because of the short shutdown, could also be incorrectly deemed as a problem by a user. In this regard, thecontrol module 5 may be further configured to execute the step of simultaneously turning on the first andsecond cooling fans 1, 2, after the step (a) but before the step (b), so as to prevent the two coolingfans 1, 2 from shutting down at the same time. - In this preferred embodiment, the
control module 5 is integrated on the computer display card; however, in other embodiments, it may also be integrated on a mother board of the computer host. In either way, the resources of GPU on the display card or CPU on the mother board can be employed to replace the micro controller of thecontrol module 5. Alternatively, thecontrol module 5 may be an independent circuit module. - Referring back to
FIG. 2 , the fin set 4 has the bottom including a frontinclined section 42 and a rearinclined section 43 on opposite sides of theflat section 41. The front and rearinclined sections flat section 41, as shown inFIG. 3 . The coolingfins 40 of the fin set 4 are placed side by side and joined together. Each coolingfin 40, substantially fabricated by metal punching process, is made of copper or aluminum. Each coolingfin 40 includes abase plate 401 together with a middle foldededge 402, a front oblique foldededge 403 and a rear oblique foldededge 404 each extending from a bottom of thebase plate 401. Those middle foldededges 402 of the coolingfins 40 together define theflat section 41 of the fin set 4. Those front oblique foldededges 403 of the coolingfins 40 together define the frontinclined section 42 of the fin set 4. Also, those rear oblique foldededges 404 of the coolingfins 40 together define the rearinclined section 43 of the fin set 4. However, this is simply an example of the fin set 4; and the fin set 4 may be made by any other way, such as by aluminum extrusion process. - Additionally, the front
inclined section 42 of the fin set 4 faces obliquely towards the first cooling fan 1 while the rearinclined section 43 of the fin set 4 faces obliquely toward thesecond cooling fan 2. As shown inFIG. 4 , the rearinclined section 43 of the fin set 4 is constructed to guide airflow towards thesecond cooling fan 2. On the other hand, the frontinclined section 42 of the fin set 4 is to guide airflow towards the first cooling fan 1, as depicted inFIG. 5 . However, the front and rearinclined sections - It will be appreciated that although a particular embodiment of the invention has been shown and described, modifications may be made. It is intended in the claims to cover such modifications which come within the spirit and scope of the invention.
Claims (7)
1. A heat dissipation device, comprising:
a fin set including a plurality of cooling fins transversely spaced apart and having a substantially flat section at a bottom thereof for contacting a heat source;
a cover including a main plate which covers a top surface of the fin set and has two inlets defined therein and longitudinally spaced apart; and
a first cooling fan mounted in one of the two inlets of the cover for generating airflow toward a front top section of the fin set;
a second cooling fan mounted in the other inlet of the cover for generating airflow toward a rear top section of the fin set; and
a control module configured to either actuate the first and second fans upon receiving a working signal or execute the following steps upon receiving a dust-disposal signal:
(a). turning on the first cooling fan and turn off the second cooling fan simultaneously for a period of time; and
(b). turning on the second cooling fan and turn off the first cooling fan simultaneously for a period of time.
2. The heat dissipation device of claim 1 , wherein after the step (a) but before the step (b), the control module further executes the step of turning on the first and second cooling fans simultaneously.
3. The heat dissipation device of claim 1 , wherein the bottom of the fin set further has a front inclined section and a rear inclined section on opposite sides of the flat section; and the front and rear inclined sections face obliquely towards the first and second cooling fans respectively and both are slanted toward the flat section.
4. The heat dissipation device of claim 2 , wherein the bottom of the fin set further has a front inclined section and a rear inclined section on opposite sides of the flat section; and the front and rear inclined sections face obliquely towards the first and second cooling fans respectively and both are slanted toward the flat section.
5. A control module employed to control a first cooling fan and a second cooling fan and configured to either actuate the first and second fans upon receiving a working signal or execute the following steps upon receiving a dust-disposal signal:
(a). turning on the first cooling fan and turn off the second cooling fan simultaneously for a period of time; and
(b). turning on the second cooling fan and turn off the first cooling fan simultaneously for a period of time.
6. The control module of claim 5 , wherein after the step (a) but before the step (b), the control module further executes the step of turning on the first and second cooling fans simultaneously.
7. A fin set comprising a plurality of cooling fins transversely spaced apart, and having a substantially flat section, a front inclined section and a rear inclined section at a bottom thereof; the flat section situated in between the front and rear inclined sections for contacting a heat source; and the front and rear inclined sections being slanted toward the flat section.
Priority Applications (1)
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US12/817,730 US20110308776A1 (en) | 2010-06-17 | 2010-06-17 | Dust-disposal heat-dissipation device with double cooling fans |
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Application Number | Priority Date | Filing Date | Title |
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US12/817,730 US20110308776A1 (en) | 2010-06-17 | 2010-06-17 | Dust-disposal heat-dissipation device with double cooling fans |
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US20110308776A1 true US20110308776A1 (en) | 2011-12-22 |
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US12/817,730 Abandoned US20110308776A1 (en) | 2010-06-17 | 2010-06-17 | Dust-disposal heat-dissipation device with double cooling fans |
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