• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Electro-hydro-dynamic heat sink comprising a base electrode (10) that receives heat from a heat source to dissipate, the base electrode (10) having a convergent shape with a cavity (11) in which it is arranged in use a fluid, and a corona electrode (20) that is disposed in the cavity (11) of the base electrode (10), the corona electrode (20) being connected to an electrical power source (FA) to ionize the fluid of the base electrode (10) and generate an ionic wind (w) from the corona electrode (20) towards the base electrode (10), such that a laminar current of the fluid is generated for the evacuation of heat to the outside of the cavity (11). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2726228A1
    申请号:ES201830328
    申请日:2018-04-02
    公开日:2019-10-02
    发明作者:Martinez Hector Puago
    申请人:Cedrion Consultoria Tecnica E Ingenieria Sl；
    IPC主号:
    专利说明:

    [0001]
    [0002] Electro-hydro-dynamic heat sink
    [0003]
    [0004] Technical sector
    [0005]
    [0006] The present invention is related to the cooling of small scale components. The invention proposes a heat sink that allows the acceleration of ions under the action of an electric field to produce the movement of a fluid in order to dissipate heat into the environment. The invention is applicable to the thermal control of a wide variety of components or equipment, being especially suitable for the field of electronics.
    [0007]
    [0008] State of the art
    [0009]
    [0010] EHD devices that use Electro-Hydro-Dynamic technology are known producing a corona effect that allows the ionization of a fluid surrounding a charged conductor. These types of devices are mainly used as fluid conditioners in various industries, typically as precipitators.
    [0011]
    [0012] EHD devices offer advantages due to the reduction of their dimensions, their low weight and electrical consumption, as well as the reduction of noise and vibrations. These characteristics mean that they are being used in refrigeration applications of small-scale components, replacing heat sinks or conventional fans.
    [0013]
    [0014] The EHD devices currently used in cooling take advantage of the corona effect to direct a stream of air towards a heat dissipation element provided with fins disposed downstream of the EHD device, so that the EHD device is used to produce air movement in the Inside the component that is intended to be cooled and the fins of the heat sink are responsible for receiving the heat and dissipating it. The EHD devices used in refrigeration are conventionally known as EHD pumps since their function is the impulsion of the air, the dissipator being the one that performs the dissipation function. See for example document US2012314334A1.
    [0015]
    [0016] There are also various academic studies that glimpse devices of very diverse design as reflected in the document “Recent advances in electrohydrodynamic pumps operated by ionic winds: a review” published in 2017 by Michael J Johnsosn and David B Go.
    [0017]
    [0018] When using fins dissipators, the dimensions of the equipment necessary for cooling are increased, which is especially counterproductive in small-scale components, such as those used in the electronics field. In addition, conventional heat sinks provided with fins that generate the same problems in the field of fluid mechanics, such as the effect of the boundary layer, or heat transfer, or temperature distribution.
    [0019]
    [0020] Therefore, a solution that allows the use of EHD technology in refrigeration without the need to use heat sinks provided with fins is necessary, thereby reducing the dimensions of the dissipating element to improve its integration into the component to be cooled.
    [0021]
    [0022] Object of the invention
    [0023]
    [0024] The invention relates to an electro-hydro-dynamic heat sink "EHD" of reduced dimensions that generates the movement of a fluid by corona effect increasing heat transfer with respect to conventional solutions, thus improving the cooling of the component where the EHD heatsink is arranged.
    [0025]
    [0026] The electro-hydro-dynamic heat sink comprises:
    [0027]
    [0028] - a base electrode that receives heat from a heat source to dissipate, the base electrode having a convergent shape with a cavity in which a fluid is in use, and
    [0029]
    [0030] - a corona electrode that is disposed in the cavity of the base electrode, the crown electrode being connected to an electrical power source to ionize the fluid of the base electrode and generate an ionic wind from the crown electrode to the base electrode, such that It generates a laminar current of the fluid for the evacuation of heat outside the cavity.
    [0031] In this way a heat sink is obtained, which in a single device integrates the functions of generating the fluid laminar current and the heat dissipation function, avoiding having to use a fin heat sink as in the solutions of the state of The technique.
    [0032]
    [0033] Preferably, the corona electrode is separated from the base electrode a minimum distance between 1 and 5 mm to allow adequate fluid ionization.
    [0034]
    [0035] The base electrode cavity has a bottom and side walls arranged in continuity of the bottom.
    [0036]
    [0037] Preferably the side walls are separated from each other a distance that is at least 5 times the minimum separation distance of the crown electrode from the base electrode.
    [0038]
    [0039] According to a preferred embodiment of the invention, the cavity has a "U" shape with arched edges at the bottom joint with the side walls.
    [0040]
    [0041] The fluid in the base electrode cavity is a dielectric fluid, such as, for example, water or air.
    [0042]
    [0043] If atmospheric pressure air is used as a fluid, the corona electrode is electrically powered between a minimum value between 500-2000 volts and a maximum value between 3000-7000 volts. In this way, a sufficient power supply is achieved to guarantee ionization and that in turn does not generate electric arcs. In this case, the corona electrode has a tip with a radius between 5 and 100 microns.
    [0044]
    [0045] Preferably, the crown electrode has an elongated shape that extends substantially parallel to the bottom of the base electrode cavity.
    [0046]
    [0047] According to another embodiment of the invention, the heat sink additionally comprises a channel arranged between the side walls and crown electrode. Preferably the channel is formed by two walls arranged on both sides of the corona electrode that extend in a direction perpendicular to the bottom of the cavity.
    [0048] According to another embodiment of the invention, the base electrode has two or more cavities, where in each of the cavities a single crown electrode is arranged.
    [0049]
    [0050] Description of the figures
    [0051]
    [0052] Figure 1 shows a perspective view of a first embodiment of the EHD electro-hydro-dynamic heat sink of the invention.
    [0053]
    [0054] Figure 2 shows a front view of the heatsink of Figure 1 showing the ionic wind generated between the electrodes of the trigger and the laminar current generated for the evacuation of heat out of the cavity.
    [0055]
    [0056] Figure 3 shows a schematic view of the power supply of the heat sink of the previous figures.
    [0057]
    [0058] Figure 4 shows a view of a second embodiment of the EHD electro-hydro-dynamic heat sink of the invention.
    [0059]
    [0060] Figure 5 shows an example with different shapes of the base electrode cavity.
    [0061]
    [0062] Figure 6 shows an example with different shapes of the crown electrode that is disposed in the base electrode cavity.
    [0063]
    [0064] Detailed description of the invention
    [0065]
    [0066] An electro-hydro-dynamic "EHD" heat sink according to a first embodiment of the invention is shown in Figures 1 to 3. The EHD heat sink is intended to be arranged in a component or equipment having a source which generates a heat that needs to dissipate, such as for example an electronic component or equipment.
    [0067]
    [0068] The EHD heat sink comprises a base electrode (10) and a corona electrode (20).
    [0069]
    [0070] The electrodes (10, 20) are made of an electrically conductive solid material. The selection of the type of material will depend on the requirements for heat dissipation of the component or equipment where the heatsink is arranged.
    [0071] The base electrode (10) has an outer face that is exposed to the heat source and an inner face, opposite the outer face, where the cavity (11) containing the fluid is arranged.
    [0072]
    [0073] The cavity (11) has a bottom (12) and side walls (13) arranged in continuity of the bottom (12).
    [0074]
    [0075] The base electrode (10) has a convergent shape with a cavity (11) in which a fluid is in use, while in said cavity (11) the crown electrode (20) is arranged. The corona electrode (20) is connected to an electrical power source (F.A) while the base electrode (10) is preferably grounded.
    [0076]
    [0077] With this arrangement the base electrode (10) receives the heat to dissipate, while in use when the corona electrode (20) is electrically powered, a corona effect occurs between the crown electrode (20) and the base electrode (10). The electric field generated between the electrodes (10, 20) produces the ionization of the fluid in the cavity (11), producing an electro-hydro-dynamic effect and thereby an ionic wind (w) from the corona electrode (20) towards the base electrode (10). The ionic wind (w) generates a laminar current of the fluid that absorbs the heat of the base electrode (10) and causes the heat to escape outside the cavity (11). The laminar flow of the fluid is generated by the impact of the moving ions with the neutral particles of the fluid.
    [0078]
    [0079] Figure 2 illustrates the operation of the heat sink, where the dashed arrows represent the ionic wind (w), the continuous arrows represent the laminar current for the evacuation of heat, and the larger arrows represent the heat received by the base electrode (10) from the heat source.
    [0080]
    [0081] The corona electrode (20) is separated from the base electrode (10) a minimum distance (G), such that for a potential difference given by corona effect the electric field generated around the corona electrode (20) is sufficient to ionize the surrounding fluid remaining in corona discharge regime and not in electric arc regime.
    [0082]
    [0083] Preferably the minimum distance (G) in which the crown electrode (20) is separated from the base electrode (10) is between 1 and 5 mm.
    [0084] As can be seen in Figure 3, the minimum distance (G) is established as the minimum distance between the crown electrode (20) and the bottom (12) of the cavity (11) of the base electrode (10).
    [0085]
    [0086] Preferably the side walls (13) of the cavity (11) are separated from each other a distance that is at least 5 times the minimum distance (G). This separation allows the ionic wind (w) to have a single principally vertical component, that is, the ion flow is directed from the electro corona (20) towards the bottom (12) of the cavity (11) of the base electrode (10). ), which is the area where most of the heat to dissipate is concentrated, since it is the outer face of the base electrode (10) that is directly exposed to the heat.
    [0087]
    [0088] Figures 1 to 4 show a cavity (11) having a "U" shape with arched edges at the bottom of the bottom (12) with the side walls (13). Other examples of embodiment of the bottom (12) and the side walls (13) of the cavity (11), for example, the cavity (11) can have a "U" shape with a right angle between the bottom (12) and the side walls ( 13), may have a "U" shape with an obtuse angle between the bottom (12) and the side walls (13), or the cavity (11) may have a circular shape. In any case the distance between the side walls ( 13), the angle of these (13) with respect to the bottom (12), or the shape of the cavity (11) is not essential, a result only necessary for the invention that the base electrode (10) has the cavity (11) and that the ionic wind (w) is generated from the corona electrode (20) to the base electrode (10).
    [0089]
    [0090] The circular shape of the cavity (11) has a smaller contact surface exposed to heat flow than the "U" shapes of Figure 5, however it does not have edges in the transition between the side walls (13) and the bottom ( 12), this transition being continuous in the case of the cavity with a circular shape, so that backwaters or sudden shocks are prevented that slow down the flow and therefore can reduce cooling. That is why the preferred form of The cavity (11) is that shown in Figures 1 to 4 with the arched edges at the bottom joint (12) with the side walls (13).
    [0091]
    [0092] The fluid in the cavity (11) is a dielectric fluid that can be ionized by the corona effect, that is, a non-conductive fluid. For example, the fluid can be a gas or a liquid, such as air or water. Industrial refrigerant can also be used as a fluid.
    [0093] The corona electrode (20) is connected to the positive terminal of the power supply (F.A), and it can be the nature of the electrical signal of any known type, such as direct, alternating, or pulsed current.
    [0094]
    [0095] The power supply conditions of the corona electrode (20) vary depending on the fluid used. For example, using air at atmospheric pressure as a fluid, the corona electrode (20) is electrically powered between a minimum value between 500-2000 volts, sufficient to ensure that air ionization occurs, and a maximum value between 3000- 7000 volts, ensuring that electric arcs are not produced. Under such power supply conditions, the corona electrode (20) has a tip with a radius between 5 and 100 microns.
    [0096]
    [0097] The crown electrode (20) has an elongated shape that extends substantially parallel to the bottom (12) of the cavity (11) of the base electrode (10). Apart from this elongated configuration, Figure 6 shows different geometries that can be adapted by the crown electrode (20).
    [0098]
    [0099] A heat sink according to a second embodiment of the invention is shown in Figure 4. The second embodiment is identical to the first embodiment described above in Figures 1 to 3 and only differs in that the heat sink additionally comprises means for channeling the ionic wind.
    [0100]
    [0101] The means for channeling the ionic wind (w) comprise a channel (30) disposed in the cavity (11) of the base electrode (10) between the side walls (13) of the cavity (11) and the crown electrode (20) .
    [0102]
    [0103] The channel (30) is made of an electrically insulating material so that it does not alter the electric field that is established between the two electrodes (10,20).
    [0104]
    [0105] The channel (30) is formed by two walls arranged on both sides of the crown electrode (20) that extend in a direction perpendicular to the bottom (12) of the cavity (11). The channel (30) restricts the movement of the fluid ion flow perpendicular to the bottom (12), so that a fluid circuit is created where the cold fluid passes between the walls of the channel (30) to direct to the bottom (12) of the cavity (11), and the bottom is evacuated to the outside of the cavity (11) along the side walls (13), such that the fluid absorbs heat from the base electrode (10) as it travels along the inside of the cavity (11).
    [0106]
    [0107] The channel (30) allows to improve the cooling conditions by breaking down the cold and hot fluid and also allows to obtain a more compact heat recuperator, since the channel (30) acts as an electrostatic barrier so that the fluid ions do not travel in An unwanted address.
    [0108]
    [0109] A heat sink with the corona electrode (20) arranged in the cavity (11) of the base electrode (10) is shown in Figures 1 to 6, although a base electrode (10) could be used depending on the cooling needs ) with two or more cavities (11), where in each of the cavities (11) a single corona electrode (20) is arranged.
    [0110]
    [0111] The isolated operation of a corona electrode (20) with respect to the other corona electrodes (20) that could be placed in a modular way prevents shielding effects between them at electrostatic level and avoids generating opposing fluid currents that reduce cooling.
    权利要求:
    Claims (13)
    [1]
    1. - Electro-hydro-dynamic heat sink characterized by comprising:
    - a base electrode (10) that receives heat from a heat source to dissipate, the base electrode (10) having a convergent shape with a cavity (11) in which a fluid is in use, and
    - a corona electrode (20) which is arranged in the cavity (11) of the base electrode (10), the corona electrode (20) being connected to an electrical power source (FA) to ionize the fluid of the base electrode (10) and generating an ionic wind (w) from the corona electrode (20) to the base electrode (10), such that a laminar current of the fluid is generated for the evacuation of heat to the outside of the cavity (11).
    [2]
    2. - Electro-hydro-dynamic heat sink according to claim 1, characterized in that the corona electrode (20) is separated from the base electrode (10) a minimum distance (G) of between 1 and 5 mm.
    [3]
    3. - Electro-hydro-dynamic heat sink according to any one of the preceding claims, characterized in that the cavity (11) has a bottom (12) and side walls (13) arranged in continuity of the bottom (12).
    [4]
    4. - Electro-hydro-dynamic heat sink according to the preceding claim, characterized in that the side walls (13) are separated from each other a distance that is at least 5 times the minimum distance (G).
    [5]
    5. - Electro-hydro-dynamic heat sink according to claim 3 or 4, characterized in that the cavity (11) has a "U" shape with arched edges at the bottom joint (12) with the side walls ( 13).
    [6]
    6. - Electro-hydro-dynamic heat sink according to any one of the preceding claims, characterized in that the cavity fluid (11) of the base electrode (10) is a dielectric fluid.
    [7]
    7. - Electro-hydro-dynamic heat sink according to the preceding claim, characterized in that the dielectric fluid is water or air.
    [8]
    8. - Electro-hydro-dynamic heat sink according to the preceding claim, characterized in that the air is at atmospheric pressure, the corona electrode (20) being electrically powered between a minimum value between 500-2000 volts and a maximum value comprised between 3000-7000 volts.
    [9]
    9. - Electro-hydro-dynamic heat sink according to the preceding claim, characterized in that the corona electrode (20) has a tip with a radius of between 5 and 100 microns.
    [10]
    10. - Electro-hydro-dynamic heat sink according to any one of claims 3 to 9, characterized in that the corona electrode (20) has an elongated shape that extends substantially parallel to the bottom (12) of the cavity ( 11) of the base electrode (10).
    [11]
    11. - Electro-hydro-dynamic heat sink according to any one of claims 3 to 10, characterized in that it additionally comprises a channel (30) disposed between the side walls (13) and corona electrode (20).
    [12]
    12. - Electro-hydro-dynamic heat sink according to the preceding claim, characterized in that the channel (30) is formed by two walls arranged on both sides of the corona electrode (20) that extend in a direction perpendicular to the bottom (12 ) of the cavity (11).
    [13]
    13. - Electro-hydro-dynamic heat sink according to any one of the preceding claims, characterized in that the base electrode (10) has two or more cavities (11), wherein each of the cavities (11) is arranged a single crown electrode (20).
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH09252068A|1996-03-15|1997-09-22|Yaskawa Electric Corp|Ion wind cooler|
    US20120175663A1|2011-01-07|2012-07-12|Samsung Electronics Co., Ltd.|Cooling unit using ionic wind and led lighting unit including the cooling unit|
    US20050007726A1|2003-01-10|2005-01-13|Schlitz Daniel J.|Ion-driven air pump device and method|
    US7830643B2|2006-01-23|2010-11-09|Igo, Inc.|Power supply with electrostatic cooling fan|
    US20090168344A1|2007-12-31|2009-07-02|Ploeg Johan F|Thermal device with electrokinetic air flow|
    JP4314307B1|2008-02-21|2009-08-12|シャープ株式会社|Heat exchanger|
    US20120314334A1|2011-06-08|2012-12-13|Tessera, Inc.|Ehd device in-situ airflow|ES2871201A1|2020-04-27|2021-10-28|Advances & Devices Healthtech S L|AIR TREATMENT DEVICE AND PROCEDURE |
    法律状态:
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    优先权:
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    ES201830328A|ES2726228B2|2018-04-02|2018-04-02|Electro-Hydro-Dynamic Heat Sink|ES201830328A| ES2726228B2|2018-04-02|2018-04-02|Electro-Hydro-Dynamic Heat Sink|
    EP19781659.8A| EP3780091A4|2018-04-02|2019-03-29|Electrohydrodynamic heat sink|
    US17/044,964| US20210164704A1|2018-04-02|2019-03-29|Electrohydrodynamic heat sink|
    PCT/ES2019/070214| WO2019193225A1|2018-04-02|2019-03-29|Electrohydrodynamic heat sink|
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