US20190178253A1 - Air flow generating device - Google Patents
Air flow generating device Download PDFInfo
- Publication number
- US20190178253A1 US20190178253A1 US15/869,080 US201815869080A US2019178253A1 US 20190178253 A1 US20190178253 A1 US 20190178253A1 US 201815869080 A US201815869080 A US 201815869080A US 2019178253 A1 US2019178253 A1 US 2019178253A1
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- US
- United States
- Prior art keywords
- frame sheet
- air flow
- air
- generating device
- holes
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/047—Pumps having electric drive
-
- 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
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/102—Adaptations or arrangements of distribution members the members being disc valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D33/00—Non-positive-displacement pumps with other than pure rotation, e.g. of oscillating type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/203—Cooling means for portable computers, e.g. for laptops
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/206—Cooling means comprising thermal management
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20536—Modifications to facilitate cooling, ventilating, or heating for racks or cabinets of standardised dimensions, e.g. electronic racks for aircraft or telecommunication equipment
- H05K7/206—Air circulating in closed loop within cabinets wherein heat is removed through air-to-air heat-exchanger
Definitions
- the invention relates to an air flow generating device, and especially relates to an air flow generating device that does not use blades but reciprocating motion for generating air flow.
- fans with rotatory blades are involved in the heat dissipation.
- the common electronic devices exchange heat with an environment by forced convection induced by rotating the rotatory blades.
- the fans with rotatory blades still need a certain installation space even if the fans with rotatory blades are miniaturized.
- the fans with rotatory blades are often used in the heat-dissipating systems of conventional notebooks.
- An aspect of the invention is to provide an air flow generating device, which uses vibrations of films to generate air pressure difference and coordinates with a one-way valve structure so as to generate a forced air flow that is capable of dissipating heat.
- An air flow generating device includes an enclosing wall, a frame sheet, a cover film, and a vibrating part.
- the enclosing wall forms an air flow passage.
- the air flow passage has an inlet and an outlet.
- the frame sheet is disposed in the air flow passage and has a plurality of through holes. The periphery of the frame sheet closely contacts the enclosing wall.
- the frame sheet partitions the air flow passage into a first air cavity connecting with the outlet, and a second air cavity connecting with the inlet.
- the cover film includes a central connection portion and a plurality of movable cover portions connected to the central connection portion. The cover film is located between the frame sheet and the outlet.
- the central connection portion is fixed on a central portion of the frame sheet.
- the movable cover portions selectively cover the through holes.
- the vibrating part is fixedly connected to the frame sheet and can repetitively move. Therein, when the vibrating part moves in a first direction toward the first air cavity, the central portion of the frame sheet and the central connection portion move in the first direction move so that the movable cover portions seal the through holes, push air in the first air cavity out through the outlet, and draw in external air from the inlet.
- the central connection portion of the cover film and at least the central portion of the frame sheet move in the second direction so that the movable cover portions lift in the first direction relative to the through holes so as to make at least a portion of the external air enter the first air cavity from the second air cavity.
- the movable cover portions and the through holes produce open and close statuses by use of the vibration of the vibrating part, so as to generate an air flow that flows in the air flow generating device through the inlet, passes through the air flow passage, and flows out the air flow generating device through outlet. Accordingly, the air flow can be used to dissipate heat.
- the air flow generating device of the invention does not use blades for generating the air flow, so the device volume of the air flow generating device needs a smaller installation space than conventional fans with rotatory blades, so that the air flow generating device is applicable to the heat-dissipating systems of thin notebooks, tablets, cellular phones and can enhance the performance of heat dissipation and improve the operation performance thereof.
- FIG. 1 is a schematic diagram illustrating an air flow generating device according to an embodiment.
- FIG. 2 is an exploded view of the air flow generating device in FIG. 1 .
- FIG. 3 is a sectional view of the air flow generating device in FIG. 1 along the line X-X, of which a vibrating part moves in a first direction.
- FIG. 4 is a sectional view of the air flow generating device in FIG. 1 along the line X-X, of which the vibrating part moves in a second direction.
- FIG. 5 is a sectional view of an air flow generating device according to another embodiment.
- FIG. 6 is a sectional view of an air flow generating device according to another embodiment.
- FIG. 7 is an exploded view of an air flow generating device according to another embodiment.
- FIG. 8 is a sectional view of the air flow generating device in FIG. 7 .
- FIG. 9 is a sectional view of the air flow generating device in FIG. 8 , of which the vibrating part moves in a second direction.
- FIG. 10 is a sectional view of an air flow generating device according to another embodiment.
- An air flow generating device 1 of an embodiment according to the invention includes an enclosing wall 10 , a frame sheet 12 (shown in an enlarged scale in the sectional views), a first cover film 14 (shown in an enlarged scale in the sectional views), and a vibrating part 16 .
- the enclosing wall 10 forms an air flow passage 102 and has a first opening 104 and a second opening 106 .
- the air flow passage 102 has one or more inlets 102 a and one or more outlets 102 b .
- the first opening 104 includes the inlet 102 a .
- the second opening 106 includes the outlet 102 b .
- the frame sheet 12 is disposed in the air flow passage 102 and has a plurality of first through holes 12 a .
- the periphery 12 b of the frame sheet 12 closely contacts the inner wall of the enclosing wall 10 or is fixed thereto.
- the first cover film 14 includes a first central connection portion 142 and a plurality of first movable cover portions 144 that are connected to the first central connection portion 142 and are disposed corresponding to the first through holes 12 a respectively.
- the first cover film 14 is located between the frame sheet 12 and the outlet 102 b .
- the first central connection portion 142 is fixed to a central portion 12 c of the frame sheet 12 (e.g. by a hot-melt join, or adhesive).
- the first movable cover portions 144 can selectively cover the first through holes 12 a .
- the vibrating part 16 (of which connection wires to an external power source are indicated by dashed lines in FIG. 3 ) is fixedly connected to the frame sheet 12 and is used for producing reciprocating motion in a single axis.
- the vibrating part 16 can be a combination of a permanent magnet and an electromagnet which uses the magnetic field produced by the electromagnet to make the permanent magnet repetitively move in the single axis so as to drive the movable cover portions 144 , which are connected to the permanent magnet, to wiggle; however, the invention is not limited thereto.
- the vibrating part 16 can include one or more piezoelectric sheet which can wiggle under a load of voltage so as to drive the movable cover portions 144 , which are connected to the piezoelectric sheet, to wiggle.
- the enclosing wall 10 can be realized by but not limited to a round barrel.
- the enclosing wall 10 can be provided with a square sectional profile.
- the frame sheet 12 and the first cover film 14 can be made of but not limited thereto polymers (e.g. polyester resin, polyethylene, polypropylene and so on) with a stamping process for forming their profiles.
- the frame sheet 12 and the first cover film 14 can be made of the same material or different materials. Both the frame sheet 12 and the first cover film 14 can be formed in a form of film, or only the first cover film 14 is formed in a form of film. In another embodiment, the frame sheet 12 and the first cover film 14 can be metal films.
- the air flow generating device 1 further includes a lower support 18 and an upper support 20 .
- the lower support 18 and the upper support 20 are disposed at the first opening 104 and the second opening 106 respectively (i.e. located at the inlet 102 a and the outlet 102 b respectively) and are fixedly connected to the enclosing wall 10 , which is conducive to the maintenance of the structure of the enclosing wall 10 and is also conducive to enhancement of the whole structural strength of the air flow generating device 1 .
- both the lower support 18 and the upper support 20 are formed by a plurality of concentric circles which are connected by several ribs; however, the lower support 18 and the upper support 20 can be formed in other structures in practice.
- lower support 18 and the upper support 20 can be formed by a disk with a plurality of through holes 182 and 202 formed thereon for air (e.g. air) to flow through.
- air e.g. air
- one of the lower support 18 and the upper support 20 can be structurally integrated with the enclosing wall 10 into one piece, e.g. by a drawing process on a metal plate to form a cup structure.
- the air flow passage 102 in the air flow generating device 1 between the lower support 18 and the upper support 20 is divided by the first cover film 14 and the frame sheet 12 into an upper air cavity A and a lower air cavity B.
- the central portion 12 c of the frame sheet 12 and the first central connection portion 142 of the first cover film 14 also move in the first direction D 1 , so that the first movable cover portions 144 seal the first through hole 12 a ; therein, the frame sheet 12 shows an upward-protruding status in FIG. 3 .
- the view point of FIG. 3 in the process that the vibrating part 16 vibrates upward (i.e.
- the air in the upper air cavity A is compressed so as to make the air pressure of the air in the upper air cavity A be higher than that of the air in the lower air cavity B, so that the frame sheet 12 and the first cover film 14 suffer downward resistance by the air in the upper air cavity A.
- the resistance will make the first movable cover portions 144 tend to be closely attached to the periphery of the first through holes 12 a , resulting in an effect of sealing the first through holes 12 a , or closing the first through holes 12 a.
- the moving toward the upper air cavity A of the frame sheet 12 and the first cover film 14 (or the moving of the frame sheet 12 driving the first cover film 14 to protrude upward together) will push the air above the frame sheet 12 in the upper air cavity A, so that the air above the frame sheet 12 in the upper air cavity A blows out the enclosing wall 10 through the outlet 102 b to form a stronger air flow (indicated by hollow arrows in FIG. 3 ).
- the upward moving of the frame sheet 12 and the first cover film 14 will also expand the lower air cavity B below the frame sheet 12 , so that the air pressure of the air in the lower air cavity B is lower than the atmospheric pressure below the lower support 18 , which drives the air below the lower support 18 to be drawn into the lower air cavity B through the inlet 102 a (indicated by hollow arrows in FIG. 3 ).
- the central portion 12 c of the frame sheet 12 and the first central connection portion 142 of the first cover film 14 also move in the second direction D 2 , so that free ends of the first movable cover portions 144 move in the first direction D 1 relative to the first through holes 12 a , resulting in that the first movable cover portions 144 lift in the first direction D 1 relative to the first through holes 12 a ; therein, the frame sheet 12 shows a downward-protruding status in FIG. 4 .
- the air in the lower air cavity B is compressed so as to make the air pressure of the air in the lower air cavity B be higher than that of the air in the upper air cavity A, so that the frame sheet 12 and the first cover film 14 suffer upward resistance by the air in the lower air cavity B.
- the resistance will make the free ends of the first movable cover portions 144 tend to depart away from the first through holes 12 a (because only one end of the first movable cover portion 144 is fixed), resulting in an effect of opening the first through holes 12 a .
- a portion of the air in the lower air cavity B below the frame sheet 12 can enter the upper air cavity A above the frame sheet 12 through the first through holes 12 a (indicated by hollow arrows in FIG. 4 ).
- the structure formed by the frame sheet 12 and the first cover film 14 has an effect as a one-way valve.
- the air outside the enclosing wall 10 is constantly drawn into the enclosing wall 10 (or the air flow passage 102 ) from the inlet 102 a , passes through the frame sheet 12 through the first through holes 12 a , and then blows out the enclosing wall 10 from the outlet 102 b .
- the flowing air forms a one-way and recurrent air flow.
- the vibration frequency is high enough, the flowing air can form a continuous air flow that continuously blows from the enclosing wall 10 .
- the air flow can be used for heat dissipation of electronic devices.
- the closely contacting of the periphery 12 b of the frame sheet 12 with the inner wall of the enclosing wall 10 is achieved by fixedly connecting the periphery 12 b of the frame sheet 12 on the enclosing wall 10 (e.g. by glue adhering), so that the periphery 12 b of the frame sheet 12 and the enclosing wall 10 can be sealed therebetween and the periphery 12 b of the frame sheet 12 can effectively separate the upper air cavity A and the lower air cavity B.
- the first movable cover portions 144 correspond to the first through holes 12 a respectively, i.e. a one-to-one correspondence.
- the disposition can be modified to make one first movable cover portion 144 cover several first through holes 12 a at the same time, so that the frame sheet 12 can reserve more structure for maintenance of structural strength in a certain degree.
- the profile of each first movable cover portion 144 is larger than the profile of the corresponding first through hole 12 a , so that when the frame sheet 12 moves upward, the first movable cover portion 144 can cover the corresponding first through hole 12 a totally.
- each first movable cover portion 144 is formed in a circular sector; each first through hole 12 a is formed in a circular sector, too.
- the first movable cover portions 144 are disposed radially relative to the first central connection portion 142 .
- the movable cover portions 144 and the first through holes 12 a can be formed in other profiles; besides, the disposition thereof is not limited to radial disposition.
- the vibrating part 16 can transfer the vibration to the frame sheet 12 efficiently (i.e. making the frame sheet 12 produce an enough motion displacement or vibration amplitude to alternatively open and close the first through holes 12 a ), an air flow can be formed by the frame sheet 12 and the first cover film 14 . Therefore, in practice, the vibrating part 16 can be fixed to other positions of the frame sheet 12 (in which the farther the location of the vibrating part 16 away from the periphery 12 b of the frame sheet 12 is, the larger the vibration amplitude is). In the embodiment, the vibrating part 16 is fixedly connected to the central portion 12 c of the frame sheet 12 , so that the frame sheet 12 suffers balance vibration.
- the vibrating part 16 is achieved by a single part; however, in practice, the vibrating part 16 can be achieved by several separate components which work in cooperation with each other to vibrate the frame sheet 12 and the first cover film 14 .
- FIG. 5 is another sectional view of an air flow generating device 3 according to another embodiment, of which the location of the cutting plane refers to the line X-X in FIG. 1 .
- the air flow generating device 3 and the air flow generating device 1 are structurally similar. Therefore, the air flow generating device 3 still uses the reference numbers used in the air flow generating device 1 .
- a vibrating part 36 of the air flow generating device 3 includes a magnet 362 and an electromagnet 364 (shown by a rectangle in FIG. 5 ).
- the magnet 362 is fixedly connected to the central portion 12 c of the frame sheet 12 .
- the electromagnet 364 is disposed on the lower support 18 opposite to the magnet 362 .
- the directions of the magnetic moments of the magnet 362 and the electromagnet 364 are parallel to the first direction D 1 (or the second direction D 2 ); however, the invention is not limited thereto in practice.
- the coils of the electromagnet 364 (of which the connection wires to an external power source are indicated by dashed lines in FIG. 5 ) conduct alternating current, the electromagnet 364 and the magnet 362 alternatively form repulsion force and attraction force, so as to produce the repetitively moving in the first direction D 1 and the second direction D 2 .
- the strength of the lower support 18 is larger than the strength of the frame sheet 12 , so that when the vibrating part 36 operates, the magnet 362 and the frame sheet 12 will produce a larger vibration (or vibration amplitude) relative to the enclosing wall 10 .
- the vibrating part 36 also can make the frame sheet 12 and the first cover film 14 act as the frame sheet 12 and the first cover film 14 of the air flow generating device 1 do, so that the air flow generating device 3 also can produce an air flow as the air flow generating device 1 does.
- the periphery 12 b and the enclosing wall 10 also can maintain airtight connection therebetween in a certain degree, so that when the magnet 362 vibrates, the frame sheet 12 vibrates together with the magnet 362 and the periphery 12 b slides on the enclosing wall 10 , so as also to generate an air flow like the above-mentioned description.
- the periphery 12 b and the enclosing wall 10 therebetween can be filled with lubrication oil, which can enhance the airtightness between the periphery 12 b and the enclosing wall 10 and further increase the contact area between the periphery 12 b and the enclosing wall 10 so as to enhance the sliding stability of the periphery 12 b on the enclosing wall 10 .
- the electromagnet 364 and the magnet 362 can exchanged, which also can make the frame sheet 12 and the first cover film 14 act as the frame sheet 12 and the first cover film 14 of the air flow generating device 1 do.
- the vibrating part 36 can be disposed above the frame sheet 12 .
- the magnet 362 is fixed on the first central connection portion 142 of the first cover film 14 (i.e. fixedly connected to the central portion 12 c of the frame sheet 12 ) while the electromagnet 364 is disposed on the upper support 20 , which also can make the air flow generating device 3 generate an air flow.
- the frame sheet 12 and the first cover film 14 can be equipped with a spring for enhancing the efficiency of the vibration. As shown by FIG.
- the air flow generating device 4 further includes a lower spring 22 and an upper spring 24 .
- the lower spring 22 is disposed between the frame sheet 12 and the lower support 18 ; in the embodiment, the two ends of the lower spring 22 abut against and between the central portion 12 c of the frame sheet 12 and the lower support 18 (or between the magnet 362 and the electromagnet 364 in practice).
- the upper spring 24 is disposed between the frame sheet 12 and the upper support 20 ; in the embodiment, the two ends of the upper spring 24 abut against and between the first central connection portion 142 and the upper support 20 .
- the upper spring 24 is elastically deformed.
- the lower spring 22 and the upper spring 24 also can be used in the air flow generating device 1 , which will not be repeatedly described in addition.
- the air flow is driven mainly by the frame sheet 12 and the first cover film 14 .
- the lower support 18 and the upper support 20 themselves do not have a valve function.
- the lower support 18 and the upper support 20 can be replaced with a structure having a valve function for enhancing the efficiency of generating the air flow.
- FIG. 7 to FIG. 9 are exploded and sectional views of an air flow generating device 5 according to another embodiment, of which the location of the cutting plane refers to the line X-X in FIG. 1 .
- the air flow generating device 5 and the air flow generating device 3 are structurally similar. Therefore, the air flow generating device 5 still uses the reference numbers used in the air flow generating device 3 .
- the air flow generating device 5 further includes a second cover film 52 and a third cover film 54 .
- the second cover film 52 is connected to the lower support 18 of the air flow generating device 5 .
- the third cover film 54 is connected to the upper support 20 of the air flow generating device 5 .
- the profiles of the lower support 56 and the upper support 58 are different than the profiles of the lower support 18 and the upper support 20 of the air flow generating device 3 .
- the lower support 56 and the upper support 58 are required to cooperate with the second cover film 52 and the third cover film 54 .
- the second cover film 52 and the third cover film 54 can effectively cover the through holes of the lower support 18 and the upper support 20 , the lower support 18 and the upper support 20 still can be used in the air flow generating device 5 .
- the lower support 56 is fixedly connected to the enclosing wall 10 through its periphery 56 b and is located at the inlet 102 a .
- the lower support 56 has a plurality of second through holes 56 a .
- the second cover film 52 includes a second central connection portion 522 and a plurality of second movable cover portions 524 connected to the second central connection portion 522 .
- the second cover film 52 is located between the lower support 56 and the frame sheet 12 .
- the second central connection portion 522 is fixed on a central portion 56 c of the lower support 56 .
- the second movable cover portions 524 cover the second through holes 56 a .
- the upper support 58 is fixedly connected to the enclosing wall 10 through its periphery 58 b and is located at the outlet 102 b .
- the upper support 58 has a plurality of third through holes 58 a .
- the third cover film 54 includes a third central connection portion 542 and a plurality of third movable cover portions 544 connected to the third central connection portion 542 .
- the upper support 58 is located between the third cover film 54 and the first cover film 52 .
- the third central connection portion 542 is fixed on a central portion 58 c of the upper support 58 .
- the third movable cover portions 544 cover the third through holes 58 a . On the whole, the space inside the enclosing wall 10 (i.e.
- the air in the upper air cavity A above the frame sheet 12 is compressed by the frame sheet 12 (and the first cover film 14 ) so as to increase the air pressure of the air in the upper air cavity A (or decrease the volume of the upper air cavity A), so that the free ends of the third movable cover portions 544 lift in the first direction D 1 relative to the third through hole 58 a .
- the air in the upper air cavity A can blow out the enclosing wall 10 through the third through holes 58 a (indicated by hollow arrows in FIG. 8 ).
- the lower air cavity B expands so as to decrease the air pressure of the air in the lower air cavity B, so that the second movable cover portions 524 lift in the first direction D 1 relative to the second through holes 56 a under the larger air pressure of the external air.
- the external air can be drawn into the lower air cavity B through the second through holes 56 a (indicated by hollow arrows in FIG. 8 ).
- the upper air cavity A expands so as to decrease the air pressure of the air in the upper air cavity A, so that the third movable cover portions 544 seal the third through holes 58 a under the larger air pressure of the external air.
- the lower air cavity B shrinks so as to the air pressure of the air in the lower air cavity B, so that the second movable cover portions 524 seal the second through holes 56 a .
- the air pressure of the air in the upper air cavity A decreases and the air pressure of the air in the lower air cavity B increases, so that the first through holes 12 a are opened, the second through holes 56 a are closed, and the third through holes 58 a are closed. That is, the air drawn in the air cavity B below the frame sheet 12 in FIG. 8 can enter the upper air cavity A above the frame sheet 12 through the first through holes 12 a (indicated by hollow arrows in FIG. 9 ).
- the structure formed by the frame sheet 12 and the first cover film 14 , the structure formed by the lower support 56 and the second cover film 52 , and the structure formed by the upper support 58 and the third cover film 54 all have an effect as a one-way valve.
- the air flow generating device 5 can draw external air from the inlet 102 a through the second through holes 56 a into the lower air cavity B, push the drawn air to pass through the first through holes 12 a of the frame sheet 12 into the upper air cavity A, and then blow the air in the upper air cavity A out from the outlet 102 b through the third through holes 58 a , resulting in an air flow.
- the lower support 56 and the upper support 58 can keep their shape unchanged and are stiff in a certain degree, which is conducive to enhancement of the whole structural strength of the air flow generating device 5 .
- the lower support 56 and the upper support 58 can be made of a membrane and are flexible like the frame sheet 12 so as to deform as the magnet 362 of the vibrating part 36 up and down moves. In this case, the lower support 56 and the upper support 58 will deform as the air pressures of the lower air cavity B and the upper air cavity A vary (relative to the external air pressure outside the enclosing wall 10 ).
- the air flow generating device 5 also can be equipped with the lower spring 22 and the upper spring 24 for enhancing the efficiency of the vibration.
- the air flow generating device 6 is equipped with the lower spring 22 and the upper spring 24 .
- the lower spring 22 is disposed between the frame sheet 12 and the lower support 56 .
- the upper spring 24 is disposed between the frame sheet 12 and the upper support 58 .
- the air flow generating devices 1 , 3 , 4 , 5 and 6 can include more supports disposed in the enclosing wall 10 (or the air flow passage 102 ) or at the first opening 104 or the second opening 106 for enhancing the structural strength of the whole devices.
- the air flow generating device 5 can includes only one of the second movable cover portions 524 and one of the third movable cover portions 544 , besides the first cover film 14 .
- the air flow generating device of the invention uses pressure difference produced by the reciprocating motion of a vibrating part in cooperation with a film and coordinates with a one-way valve structure so as to generate a forced air flow that is capable of dissipating heat, which is different from the conventional fans with rotatory blades.
- the device volume of the air flow generating device can be smaller than the conventional fans with rotatory blades, so that the air flow generating device is applicable to the heat-dissipating systems of thin notebooks, tablets, cellular phones and can enhance the performance of heat dissipation and improve the operation performance thereof.
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- General Engineering & Computer Science (AREA)
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- Human Computer Interaction (AREA)
- General Physics & Mathematics (AREA)
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Abstract
Description
- The invention relates to an air flow generating device, and especially relates to an air flow generating device that does not use blades but reciprocating motion for generating air flow.
- For heat dissipation of common electronic devices, fans with rotatory blades are involved in the heat dissipation. The common electronic devices exchange heat with an environment by forced convection induced by rotating the rotatory blades. The fans with rotatory blades still need a certain installation space even if the fans with rotatory blades are miniaturized. The fans with rotatory blades are often used in the heat-dissipating systems of conventional notebooks. However, for thin notebooks, tablets, cellular phones, because the structure sizes of the devices are limited, it is difficult for the fans with rotatory blades to meet the requirements of the devices, resulting in difficulty in quickly dissipating heat produced by the devices in operation, so that the operation performance of the devices is impaired.
- An aspect of the invention is to provide an air flow generating device, which uses vibrations of films to generate air pressure difference and coordinates with a one-way valve structure so as to generate a forced air flow that is capable of dissipating heat.
- An air flow generating device according to the invention includes an enclosing wall, a frame sheet, a cover film, and a vibrating part. The enclosing wall forms an air flow passage. The air flow passage has an inlet and an outlet. The frame sheet is disposed in the air flow passage and has a plurality of through holes. The periphery of the frame sheet closely contacts the enclosing wall. The frame sheet partitions the air flow passage into a first air cavity connecting with the outlet, and a second air cavity connecting with the inlet. The cover film includes a central connection portion and a plurality of movable cover portions connected to the central connection portion. The cover film is located between the frame sheet and the outlet. The central connection portion is fixed on a central portion of the frame sheet. The movable cover portions selectively cover the through holes. The vibrating part is fixedly connected to the frame sheet and can repetitively move. Therein, when the vibrating part moves in a first direction toward the first air cavity, the central portion of the frame sheet and the central connection portion move in the first direction move so that the movable cover portions seal the through holes, push air in the first air cavity out through the outlet, and draw in external air from the inlet. When the vibrating part moves in a second direction opposite to the first direction toward the second air cavity, the central connection portion of the cover film and at least the central portion of the frame sheet move in the second direction so that the movable cover portions lift in the first direction relative to the through holes so as to make at least a portion of the external air enter the first air cavity from the second air cavity. Thereby, the movable cover portions and the through holes produce open and close statuses by use of the vibration of the vibrating part, so as to generate an air flow that flows in the air flow generating device through the inlet, passes through the air flow passage, and flows out the air flow generating device through outlet. Accordingly, the air flow can be used to dissipate heat.
- Compared with the prior art, the air flow generating device of the invention does not use blades for generating the air flow, so the device volume of the air flow generating device needs a smaller installation space than conventional fans with rotatory blades, so that the air flow generating device is applicable to the heat-dissipating systems of thin notebooks, tablets, cellular phones and can enhance the performance of heat dissipation and improve the operation performance thereof.
- These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
-
FIG. 1 is a schematic diagram illustrating an air flow generating device according to an embodiment. -
FIG. 2 is an exploded view of the air flow generating device inFIG. 1 . -
FIG. 3 is a sectional view of the air flow generating device inFIG. 1 along the line X-X, of which a vibrating part moves in a first direction. -
FIG. 4 is a sectional view of the air flow generating device inFIG. 1 along the line X-X, of which the vibrating part moves in a second direction. -
FIG. 5 is a sectional view of an air flow generating device according to another embodiment. -
FIG. 6 is a sectional view of an air flow generating device according to another embodiment. -
FIG. 7 is an exploded view of an air flow generating device according to another embodiment. -
FIG. 8 is a sectional view of the air flow generating device inFIG. 7 . -
FIG. 9 is a sectional view of the air flow generating device inFIG. 8 , of which the vibrating part moves in a second direction. -
FIG. 10 is a sectional view of an air flow generating device according to another embodiment. - Please refer to
FIG. 1 toFIG. 4 . An airflow generating device 1 of an embodiment according to the invention includes an enclosingwall 10, a frame sheet 12 (shown in an enlarged scale in the sectional views), a first cover film 14 (shown in an enlarged scale in the sectional views), and avibrating part 16. The enclosingwall 10 forms anair flow passage 102 and has afirst opening 104 and asecond opening 106. Theair flow passage 102 has one ormore inlets 102 a and one ormore outlets 102 b. Therein, thefirst opening 104 includes theinlet 102 a. Thesecond opening 106 includes theoutlet 102 b. Theframe sheet 12 is disposed in theair flow passage 102 and has a plurality of first throughholes 12 a. Theperiphery 12 b of theframe sheet 12 closely contacts the inner wall of the enclosingwall 10 or is fixed thereto. Thefirst cover film 14 includes a firstcentral connection portion 142 and a plurality of firstmovable cover portions 144 that are connected to the firstcentral connection portion 142 and are disposed corresponding to the first throughholes 12 a respectively. Thefirst cover film 14 is located between theframe sheet 12 and theoutlet 102 b. The firstcentral connection portion 142 is fixed to acentral portion 12 c of the frame sheet 12 (e.g. by a hot-melt join, or adhesive). The firstmovable cover portions 144 can selectively cover the first throughholes 12 a. The vibrating part 16 (of which connection wires to an external power source are indicated by dashed lines inFIG. 3 ) is fixedly connected to theframe sheet 12 and is used for producing reciprocating motion in a single axis. In the embodiment, thevibrating part 16 can be a combination of a permanent magnet and an electromagnet which uses the magnetic field produced by the electromagnet to make the permanent magnet repetitively move in the single axis so as to drive themovable cover portions 144, which are connected to the permanent magnet, to wiggle; however, the invention is not limited thereto. For example, the vibratingpart 16 can include one or more piezoelectric sheet which can wiggle under a load of voltage so as to drive themovable cover portions 144, which are connected to the piezoelectric sheet, to wiggle. In practice, the enclosingwall 10 can be realized by but not limited to a round barrel. For example, the enclosingwall 10 can be provided with a square sectional profile. Theframe sheet 12 and thefirst cover film 14 can be made of but not limited thereto polymers (e.g. polyester resin, polyethylene, polypropylene and so on) with a stamping process for forming their profiles. Theframe sheet 12 and thefirst cover film 14 can be made of the same material or different materials. Both theframe sheet 12 and thefirst cover film 14 can be formed in a form of film, or only thefirst cover film 14 is formed in a form of film. In another embodiment, theframe sheet 12 and thefirst cover film 14 can be metal films. - Furthermore, the air
flow generating device 1 further includes alower support 18 and anupper support 20. Thelower support 18 and theupper support 20 are disposed at thefirst opening 104 and thesecond opening 106 respectively (i.e. located at theinlet 102 a and theoutlet 102 b respectively) and are fixedly connected to the enclosingwall 10, which is conducive to the maintenance of the structure of the enclosingwall 10 and is also conducive to enhancement of the whole structural strength of the airflow generating device 1. In addition, in the embodiment, both thelower support 18 and theupper support 20 are formed by a plurality of concentric circles which are connected by several ribs; however, thelower support 18 and theupper support 20 can be formed in other structures in practice. For example,lower support 18 and theupper support 20 can be formed by a disk with a plurality of throughholes lower support 18 and theupper support 20 can be structurally integrated with the enclosingwall 10 into one piece, e.g. by a drawing process on a metal plate to form a cup structure. In the embodiment, theair flow passage 102 in the airflow generating device 1 between thelower support 18 and theupper support 20 is divided by thefirst cover film 14 and theframe sheet 12 into an upper air cavity A and a lower air cavity B. - When the vibrating
part 16 moves in a first direction D1 toward the upper air cavity A (as shown byFIG. 3 , in which the vibratingpart 16 is located at an upper position of the vibration in the view point ofFIG. 3 ), thecentral portion 12 c of theframe sheet 12 and the firstcentral connection portion 142 of thefirst cover film 14 also move in the first direction D1, so that the firstmovable cover portions 144 seal the first throughhole 12 a; therein, theframe sheet 12 shows an upward-protruding status inFIG. 3 . In the view point ofFIG. 3 , in the process that the vibratingpart 16 vibrates upward (i.e. move in the first direction D1), the air in the upper air cavity A is compressed so as to make the air pressure of the air in the upper air cavity A be higher than that of the air in the lower air cavity B, so that theframe sheet 12 and thefirst cover film 14 suffer downward resistance by the air in the upper air cavity A. The resistance will make the firstmovable cover portions 144 tend to be closely attached to the periphery of the first throughholes 12 a, resulting in an effect of sealing the first throughholes 12 a, or closing the first throughholes 12 a. - Furthermore, in the process that the vibrating
part 16 vibrates upward, the moving toward the upper air cavity A of theframe sheet 12 and the first cover film 14 (or the moving of theframe sheet 12 driving thefirst cover film 14 to protrude upward together) will push the air above theframe sheet 12 in the upper air cavity A, so that the air above theframe sheet 12 in the upper air cavity A blows out the enclosingwall 10 through theoutlet 102 b to form a stronger air flow (indicated by hollow arrows inFIG. 3 ). At the same time, the upward moving of theframe sheet 12 and thefirst cover film 14 will also expand the lower air cavity B below theframe sheet 12, so that the air pressure of the air in the lower air cavity B is lower than the atmospheric pressure below thelower support 18, which drives the air below thelower support 18 to be drawn into the lower air cavity B through theinlet 102 a (indicated by hollow arrows inFIG. 3 ). - Furthermore, when the vibrating
part 16 moves in a second direction D2 opposite to the first direction D1 toward the lower air cavity B (as shown byFIG. 4 , in which the vibratingpart 16 is located at a lower position of the vibration in the view point ofFIG. 4 ), thecentral portion 12 c of theframe sheet 12 and the firstcentral connection portion 142 of thefirst cover film 14 also move in the second direction D2, so that free ends of the firstmovable cover portions 144 move in the first direction D1 relative to the first throughholes 12 a, resulting in that the firstmovable cover portions 144 lift in the first direction D1 relative to the first throughholes 12 a; therein, theframe sheet 12 shows a downward-protruding status inFIG. 4 . In the view point ofFIG. 4 , in the process that the vibratingpart 16 vibrates downward (i.e. move in the second direction D2), the air in the lower air cavity B is compressed so as to make the air pressure of the air in the lower air cavity B be higher than that of the air in the upper air cavity A, so that theframe sheet 12 and thefirst cover film 14 suffer upward resistance by the air in the lower air cavity B. The resistance will make the free ends of the firstmovable cover portions 144 tend to depart away from the first throughholes 12 a (because only one end of the firstmovable cover portion 144 is fixed), resulting in an effect of opening the first throughholes 12 a. At the same time, a portion of the air in the lower air cavity B below theframe sheet 12 can enter the upper air cavity A above theframe sheet 12 through the first throughholes 12 a (indicated by hollow arrows inFIG. 4 ). - Therefore, in the embodiment, the structure formed by the
frame sheet 12 and thefirst cover film 14 has an effect as a one-way valve. By the up and down reciprocating motion of the vibratingpart 16, the air outside the enclosingwall 10 is constantly drawn into the enclosing wall 10 (or the air flow passage 102) from theinlet 102 a, passes through theframe sheet 12 through the first throughholes 12 a, and then blows out the enclosingwall 10 from theoutlet 102 b. The flowing air forms a one-way and recurrent air flow. As long as the vibration frequency is high enough, the flowing air can form a continuous air flow that continuously blows from the enclosingwall 10. In practice, the air flow can be used for heat dissipation of electronic devices. - In addition, in the embodiment, the closely contacting of the
periphery 12 b of theframe sheet 12 with the inner wall of the enclosingwall 10 is achieved by fixedly connecting theperiphery 12 b of theframe sheet 12 on the enclosing wall 10 (e.g. by glue adhering), so that theperiphery 12 b of theframe sheet 12 and the enclosingwall 10 can be sealed therebetween and theperiphery 12 b of theframe sheet 12 can effectively separate the upper air cavity A and the lower air cavity B. - In addition, in the embodiment, the first
movable cover portions 144 correspond to the first throughholes 12 a respectively, i.e. a one-to-one correspondence. However, in practice, the disposition can be modified to make one firstmovable cover portion 144 cover several first throughholes 12 a at the same time, so that theframe sheet 12 can reserve more structure for maintenance of structural strength in a certain degree. Furthermore, in the embodiment, the profile of each firstmovable cover portion 144 is larger than the profile of the corresponding first throughhole 12 a, so that when theframe sheet 12 moves upward, the firstmovable cover portion 144 can cover the corresponding first throughhole 12 a totally. In practice, even if the firstmovable cover portion 144 does not cover the corresponding first throughhole 12 a totally, the firstmovable cover portion 144 still can provide a covering effect in a certain degree, that is, so as to make the airflow generating device 1 generate an air flow. Furthermore, in the embodiment, each firstmovable cover portion 144 is formed in a circular sector; each first throughhole 12 a is formed in a circular sector, too. The firstmovable cover portions 144 are disposed radially relative to the firstcentral connection portion 142. However, in practice, themovable cover portions 144 and the first throughholes 12 a can be formed in other profiles; besides, the disposition thereof is not limited to radial disposition. As long as the vibratingpart 16 can transfer the vibration to theframe sheet 12 efficiently (i.e. making theframe sheet 12 produce an enough motion displacement or vibration amplitude to alternatively open and close the first throughholes 12 a), an air flow can be formed by theframe sheet 12 and thefirst cover film 14. Therefore, in practice, the vibratingpart 16 can be fixed to other positions of the frame sheet 12 (in which the farther the location of the vibratingpart 16 away from theperiphery 12 b of theframe sheet 12 is, the larger the vibration amplitude is). In the embodiment, the vibratingpart 16 is fixedly connected to thecentral portion 12 c of theframe sheet 12, so that theframe sheet 12 suffers balance vibration. - In the embodiment, the vibrating
part 16 is achieved by a single part; however, in practice, the vibratingpart 16 can be achieved by several separate components which work in cooperation with each other to vibrate theframe sheet 12 and thefirst cover film 14. Please refer toFIG. 5 , which is another sectional view of an air flow generating device 3 according to another embodiment, of which the location of the cutting plane refers to the line X-X inFIG. 1 . The air flow generating device 3 and the airflow generating device 1 are structurally similar. Therefore, the air flow generating device 3 still uses the reference numbers used in the airflow generating device 1. For other descriptions of the air flow generating device 3, please refer to the relevant descriptions of the airflow generating device 1 and the variants thereof, which will not be repeatedly described in addition. A main difference between the air flow generating device 3 and the airflow generating device 1 is that a vibratingpart 36 of the air flow generating device 3 includes amagnet 362 and an electromagnet 364 (shown by a rectangle inFIG. 5 ). Themagnet 362 is fixedly connected to thecentral portion 12 c of theframe sheet 12. Theelectromagnet 364 is disposed on thelower support 18 opposite to themagnet 362. In the embodiment, the directions of the magnetic moments of themagnet 362 and theelectromagnet 364 are parallel to the first direction D1 (or the second direction D2); however, the invention is not limited thereto in practice. When the coils of the electromagnet 364 (of which the connection wires to an external power source are indicated by dashed lines inFIG. 5 ) conduct alternating current, theelectromagnet 364 and themagnet 362 alternatively form repulsion force and attraction force, so as to produce the repetitively moving in the first direction D1 and the second direction D2. Furthermore, in the embodiment, the strength of thelower support 18 is larger than the strength of theframe sheet 12, so that when the vibratingpart 36 operates, themagnet 362 and theframe sheet 12 will produce a larger vibration (or vibration amplitude) relative to the enclosingwall 10. Thereby, the vibratingpart 36 also can make theframe sheet 12 and thefirst cover film 14 act as theframe sheet 12 and thefirst cover film 14 of the airflow generating device 1 do, so that the air flow generating device 3 also can produce an air flow as the airflow generating device 1 does. - In addition, in practice, if the
periphery 12 b is disposed to slidably contact the enclosingwall 10, theperiphery 12 b and the enclosingwall 10 also can maintain airtight connection therebetween in a certain degree, so that when themagnet 362 vibrates, theframe sheet 12 vibrates together with themagnet 362 and theperiphery 12 b slides on the enclosingwall 10, so as also to generate an air flow like the above-mentioned description. Furthermore, theperiphery 12 b and the enclosingwall 10 therebetween can be filled with lubrication oil, which can enhance the airtightness between theperiphery 12 b and the enclosingwall 10 and further increase the contact area between theperiphery 12 b and the enclosingwall 10 so as to enhance the sliding stability of theperiphery 12 b on the enclosingwall 10. - In addition, in practice, the
electromagnet 364 and themagnet 362 can exchanged, which also can make theframe sheet 12 and thefirst cover film 14 act as theframe sheet 12 and thefirst cover film 14 of the airflow generating device 1 do. Furthermore, in practice, the vibratingpart 36 can be disposed above theframe sheet 12. For example, themagnet 362 is fixed on the firstcentral connection portion 142 of the first cover film 14 (i.e. fixedly connected to thecentral portion 12 c of the frame sheet 12) while theelectromagnet 364 is disposed on theupper support 20, which also can make the air flow generating device 3 generate an air flow. Furthermore, in practice, theframe sheet 12 and thefirst cover film 14 can be equipped with a spring for enhancing the efficiency of the vibration. As shown byFIG. 6 , compared with the air flow generating device 3, the airflow generating device 4 further includes alower spring 22 and anupper spring 24. Thelower spring 22 is disposed between theframe sheet 12 and thelower support 18; in the embodiment, the two ends of thelower spring 22 abut against and between thecentral portion 12 c of theframe sheet 12 and the lower support 18 (or between themagnet 362 and theelectromagnet 364 in practice). When the vibratingpart 36 vibrates, thelower spring 22 is elastically deformed. Theupper spring 24 is disposed between theframe sheet 12 and theupper support 20; in the embodiment, the two ends of theupper spring 24 abut against and between the firstcentral connection portion 142 and theupper support 20. When the vibratingpart 36 vibrates, theupper spring 24 is elastically deformed. Thelower spring 22 and theupper spring 24 also can be used in the airflow generating device 1, which will not be repeatedly described in addition. - In the above embodiments, the air flow is driven mainly by the
frame sheet 12 and thefirst cover film 14. Thelower support 18 and theupper support 20 themselves do not have a valve function. However, in practice, thelower support 18 and theupper support 20 can be replaced with a structure having a valve function for enhancing the efficiency of generating the air flow. Please refer toFIG. 7 toFIG. 9 , which are exploded and sectional views of an airflow generating device 5 according to another embodiment, of which the location of the cutting plane refers to the line X-X inFIG. 1 . The airflow generating device 5 and the air flow generating device 3 are structurally similar. Therefore, the airflow generating device 5 still uses the reference numbers used in the air flow generating device 3. For other descriptions of the airflow generating device 5, please refer to the relevant descriptions of the airflow generating devices 1 and 3 and the variants thereof, which will not be repeatedly described in addition. Compared with the air flow generating device 3, the airflow generating device 5 further includes asecond cover film 52 and athird cover film 54. Thesecond cover film 52 is connected to thelower support 18 of the airflow generating device 5. Thethird cover film 54 is connected to theupper support 20 of the airflow generating device 5. In the embodiment, the profiles of thelower support 56 and theupper support 58 are different than the profiles of thelower support 18 and theupper support 20 of the air flow generating device 3. This is because thelower support 56 and theupper support 58 are required to cooperate with thesecond cover film 52 and thethird cover film 54. However, in practice, if thesecond cover film 52 and thethird cover film 54 can effectively cover the through holes of thelower support 18 and theupper support 20, thelower support 18 and theupper support 20 still can be used in the airflow generating device 5. - Further, the
lower support 56 is fixedly connected to the enclosingwall 10 through itsperiphery 56 b and is located at theinlet 102 a. Thelower support 56 has a plurality of second throughholes 56 a. Thesecond cover film 52 includes a secondcentral connection portion 522 and a plurality of secondmovable cover portions 524 connected to the secondcentral connection portion 522. Thesecond cover film 52 is located between thelower support 56 and theframe sheet 12. The secondcentral connection portion 522 is fixed on acentral portion 56 c of thelower support 56. The secondmovable cover portions 524 cover the second throughholes 56 a. Furthermore, theupper support 58 is fixedly connected to the enclosingwall 10 through itsperiphery 58 b and is located at theoutlet 102 b. Theupper support 58 has a plurality of third throughholes 58 a. Thethird cover film 54 includes a thirdcentral connection portion 542 and a plurality of thirdmovable cover portions 544 connected to the thirdcentral connection portion 542. Theupper support 58 is located between thethird cover film 54 and thefirst cover film 52. The thirdcentral connection portion 542 is fixed on acentral portion 58 c of theupper support 58. The thirdmovable cover portions 544 cover the third throughholes 58 a. On the whole, the space inside the enclosing wall 10 (i.e. equivalent to the air flow passage 102) is divided into a lower air cavity B and an upper air cavity A by the lower support (together with the second cover film 52), the frame sheet 12 (together with the first cover film 14), and the upper support 58 (together with the third cover film 54). - As shown by
FIG. 8 , when themagnet 362 of the vibratingpart 36 moves in the first direction D1, thecentral portion 12 c of theframe sheet 12 and the firstcentral connection portion 142 of thefirst cover film 14 move in the first direction D1, so that the firstmovable cover portions 144 seal the first throughholes 12 a, free ends of the secondmovable cover portions 524 move in the first direction D1 relative to the second throughholes 56 a, and free ends of the thirdmovable cover portions 544 move in the first direction D1 relative to the third throughholes 58 a. Therein, in the view point ofFIG. 8 , in the process that themagnet 362 of the vibratingpart 36 vibrates upward, the air in the upper air cavity A above theframe sheet 12 is compressed by the frame sheet 12 (and the first cover film 14) so as to increase the air pressure of the air in the upper air cavity A (or decrease the volume of the upper air cavity A), so that the free ends of the thirdmovable cover portions 544 lift in the first direction D1 relative to the third throughhole 58 a. Thereby, the air in the upper air cavity A can blow out the enclosingwall 10 through the third throughholes 58 a (indicated by hollow arrows inFIG. 8 ). Similarly, in the process that themagnet 362 of the vibratingpart 36 vibrates upward, the lower air cavity B expands so as to decrease the air pressure of the air in the lower air cavity B, so that the secondmovable cover portions 524 lift in the first direction D1 relative to the second throughholes 56 a under the larger air pressure of the external air. Thereby, the external air can be drawn into the lower air cavity B through the second throughholes 56 a (indicated by hollow arrows inFIG. 8 ). - As shown by
FIG. 9 , when themagnet 362 of the vibratingpart 36 moves in the second direction D2, thecentral portion 12 c of theframe sheet 12 and the firstcentral connection portion 142 of thefirst cover film 14 also move in the second direction D2, so that the free ends of the firstmovable cover portions 144 lift in the first direction D1 relative to the first throughholes 12 a, the secondmovable cover portions 524 seal the second throughholes 56 a, and the thirdmovable cover portions 544 seal the third throughholes 58 a. Therein, in the view point ofFIG. 9 , in the process that themagnet 362 of the vibratingpart 36 vibrates downward, the upper air cavity A expands so as to decrease the air pressure of the air in the upper air cavity A, so that the thirdmovable cover portions 544 seal the third throughholes 58 a under the larger air pressure of the external air. Similarly, in the process that themagnet 362 of the vibratingpart 36 vibrates downward, the lower air cavity B shrinks so as to the air pressure of the air in the lower air cavity B, so that the secondmovable cover portions 524 seal the second throughholes 56 a. In another aspect, when themagnet 362 of the vibratingpart 36 moves in the second direction D2, the air pressure of the air in the upper air cavity A decreases and the air pressure of the air in the lower air cavity B increases, so that the first throughholes 12 a are opened, the second throughholes 56 a are closed, and the third throughholes 58 a are closed. That is, the air drawn in the air cavity B below theframe sheet 12 inFIG. 8 can enter the upper air cavity A above theframe sheet 12 through the first throughholes 12 a (indicated by hollow arrows inFIG. 9 ). - Furthermore, in the embodiment, the structure formed by the
frame sheet 12 and thefirst cover film 14, the structure formed by thelower support 56 and thesecond cover film 52, and the structure formed by theupper support 58 and thethird cover film 54 all have an effect as a one-way valve. By the up and down reciprocating motion of themagnet 362 and the vibratingpart 36, the airflow generating device 5 can draw external air from theinlet 102 a through the second throughholes 56 a into the lower air cavity B, push the drawn air to pass through the first throughholes 12 a of theframe sheet 12 into the upper air cavity A, and then blow the air in the upper air cavity A out from theoutlet 102 b through the third throughholes 58 a, resulting in an air flow. - In addition, in the embodiment, when the
magnet 362 of the vibratingpart 36 up and down moves, thelower support 56 and the upper support 58 (like thelower support 18 and the upper support 20) can keep their shape unchanged and are stiff in a certain degree, which is conducive to enhancement of the whole structural strength of the airflow generating device 5. However, in practice, thelower support 56 and theupper support 58 can be made of a membrane and are flexible like theframe sheet 12 so as to deform as themagnet 362 of the vibratingpart 36 up and down moves. In this case, thelower support 56 and theupper support 58 will deform as the air pressures of the lower air cavity B and the upper air cavity A vary (relative to the external air pressure outside the enclosing wall 10). - In addition, in practice, the air
flow generating device 5 also can be equipped with thelower spring 22 and theupper spring 24 for enhancing the efficiency of the vibration. As shown byFIG. 10 , compared with the airflow generating device 5, the airflow generating device 6 is equipped with thelower spring 22 and theupper spring 24. Therein, thelower spring 22 is disposed between theframe sheet 12 and thelower support 56. Theupper spring 24 is disposed between theframe sheet 12 and theupper support 58. When the vibratingpart 36 acts (i.e. making themagnet 362 vibrate), thelower spring 22 and theupper spring 24 elastically deform. - In addition, in practice, without changing the action of the components that are used to generate air flow (e.g. the
frame sheet 12, thefirst cover film 14, the vibratingpart 16 and so on), the airflow generating devices first opening 104 or thesecond opening 106 for enhancing the structural strength of the whole devices. - Furthermore, in other embodiments, the air
flow generating device 5 can includes only one of the secondmovable cover portions 524 and one of the thirdmovable cover portions 544, besides thefirst cover film 14. - Thereby, compared with the prior art, the air flow generating device of the invention uses pressure difference produced by the reciprocating motion of a vibrating part in cooperation with a film and coordinates with a one-way valve structure so as to generate a forced air flow that is capable of dissipating heat, which is different from the conventional fans with rotatory blades. The device volume of the air flow generating device can be smaller than the conventional fans with rotatory blades, so that the air flow generating device is applicable to the heat-dissipating systems of thin notebooks, tablets, cellular phones and can enhance the performance of heat dissipation and improve the operation performance thereof.
- Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims (15)
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CN110878747A (en) * | 2019-12-10 | 2020-03-13 | 太湖县裕顺防水工程有限公司 | Air compressor |
CN113597193A (en) * | 2020-04-30 | 2021-11-02 | 维沃移动通信有限公司 | Airflow generating device, heat radiating device and electronic equipment |
CN111867325B (en) * | 2020-07-01 | 2021-04-20 | 南京航空航天大学 | Electronic component heat dissipation system and method based on electromagnetic vibration and evaporative cooling |
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Also Published As
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CN109899327A (en) | 2019-06-18 |
US11466674B2 (en) | 2022-10-11 |
US20210140422A1 (en) | 2021-05-13 |
TW201925623A (en) | 2019-07-01 |
TWI658209B (en) | 2019-05-01 |
CN109899327B (en) | 2021-09-21 |
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