CN113365471B - Self-circulation phase change cooling device and method based on electric drive technology - Google Patents
Self-circulation phase change cooling device and method based on electric drive technology Download PDFInfo
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- CN113365471B CN113365471B CN202110553353.4A CN202110553353A CN113365471B CN 113365471 B CN113365471 B CN 113365471B CN 202110553353 A CN202110553353 A CN 202110553353A CN 113365471 B CN113365471 B CN 113365471B
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- 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
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20309—Evaporators
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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
- F28D15/04—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 with tubes having a capillary structure
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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
- F28D15/04—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 with tubes having a capillary structure
- F28D15/046—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 with tubes having a capillary structure characterised by the material or the construction of the capillary structure
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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
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/16—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying an electrostatic field to the body of the heat-exchange medium
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- 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
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20318—Condensers
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- 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
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20327—Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds
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Abstract
The invention provides a self-circulation phase change cooling device based on an electric drive technology and a method thereof, wherein the device comprises a device shell, a high-voltage electrostatic generator, a condenser, an overflow plate, a liquid storage tank steam channel, a capillary tube integrated plate, a plurality of capillary tubes, an insulating layer and a heat sink; the overflow plate is vertically arranged in the device shell to divide the inner part of the device shell into a liquid storage tank and a steam channel; the capillary storage tube is connected with a high-voltage electrostatic generator; the heat sink is positioned at the bottom in the device shell, and the upper surface of the heat sink is covered with an insulating layer and is subjected to grounding treatment; the invention takes volatile liquid as a cooling working medium, adopts an external high-voltage static mode, and under the comprehensive action of electric field force and pressure, the liquid working medium is driven to continuously flow to the heating surface, the liquid working medium generates phase change heat exchange on the bottom hot surface, superheated working medium steam flows upwards to be condensed and liquefied by the condenser and enters the liquid storage tank, and the electric drive technology effectively promotes the circulating flow of working liquid, thereby greatly improving the cooling and heat exchange capacity of the device.
Description
Technical Field
The invention belongs to the technical field of electronic component thermal management, and particularly relates to a self-circulation phase change cooling device and a self-circulation phase change cooling method based on an electric drive technology.
Background
At present, with the continuous improvement of the performance and the continuous reduction of the volume of the electronic device, the heat flux density of the electronic device is higher and higher, and the passive cooling modes such as air cooling and natural convection are difficult to meet the heat dissipation requirements of the electronic device. The phase change cooling can fully utilize the latent heat of vaporization of the liquid to realize the high-efficiency heat dissipation of the heating element with large heat flux density, such as a heat pipe. The heat pipe technology is a phase change process that a medium is condensed at a cold end after being evaporated at a hot end, the heat conduction principle and the rapid heat transfer property of the phase change medium are fully utilized, heat of a heating object is rapidly transferred to the outside of a heat source through a heat pipe, the heat conduction capability of the heat pipe exceeds the heat conduction capability of any known metal, and the heat pipe has the advantages of simple structure, stable performance, low noise and the like, and is widely applied to the fields of chips, high-power lasers, LEDs and the like in recent years.
However, the heat dissipation capability of conventional heat pipes is typically limited by the capillary limit and the liquid loading of the wick. The capillary limit, i.e. the capillary head, is the main driving force for the circulation of the working liquid inside the heat pipe, and is used to overcome the pressure drop of the vapor flowing from the evaporation section to the condensation section. Under the working condition of large heat flux density, the untimely circulation of the working medium can generally cause the evaporation of the evaporation section and even damage, thereby causing the overheating of the electronic component to generate faults.
Disclosure of Invention
In order to solve the technical problems, the invention provides a self-circulation phase change cooling device based on an electric drive technology and a method thereof, volatile liquid is used as a cooling working medium, a high-voltage static electricity mode is additionally adopted, the liquid working medium is driven to continuously flow to a heating surface under the comprehensive action of electric field force and pressure, the device has good sealing performance, the liquid working medium generates phase change heat exchange on the bottom heat surface, subsequently, superheated working medium steam flows upwards to flow through a condenser to be condensed and liquefied and enters a liquid storage tank under the action of pressure difference, the electric drive technology effectively promotes the circulation flow of working liquid, and therefore, the cooling and heat exchange capacity of the device is greatly improved.
The technical scheme of the invention is as follows: a self-circulation phase change cooling device based on an electric drive technology comprises a device shell, a high-voltage electrostatic generator, a condenser, an overflow plate, a liquid storage tank steam channel, a capillary tube integrated plate, a plurality of capillary tubes, an insulating layer and a heat sink; the overflow plate is vertically arranged in the device shell, and the inner part of the device shell is divided into a liquid storage tank and a steam channel; the bottom of the liquid storage tank is provided with a capillary tube integration plate, and the capillary tube integration plate is provided with a plurality of capillary tubes; the capillary tube is connected with a high-voltage electrostatic generator; the heat sink is positioned at the bottom in the device shell and below the capillary tube, and the upper surface of the heat sink is covered with an insulating layer and is subjected to grounding treatment; the steam channel is used for condensing and recycling the evaporated gas-phase working medium; the condenser is arranged right above the liquid storage tank; the liquid working medium in the liquid storage tank flows downwards to the surface of the heat sink from the capillary under the action of electrostatic force, the liquid working medium is heated and evaporated on the surface of the heat sink to form a gas phase working medium, the gas phase working medium moves upwards along the steam channel and is condensed near the condenser at the top, the condenser discharges heat to the outside, and the liquefied working medium falls and is recovered to the liquid storage tank below.
In the scheme, the device shell and the overflow plate are made of insulating materials, the capillary integrated plate is made of metal materials and is connected with the high-voltage electrostatic generator, and a strong needle-plate non-uniform electric field is formed between the capillary integrated plate and the grounded heat sink.
In the scheme, the cooling working medium is low-boiling-point volatile dielectric liquid.
In the scheme, the device further comprises a pressure release valve; the pressure relief valve is mounted on the device housing.
In the above scheme, the capillary is made of metal, and the pore diameter range is 100-500 μm.
In the above scheme, the upper surface of the heat sink is coated with an insulating layer in a spinning manner, and the thickness range is 100-.
In the scheme, the distance H between the capillary and the heat sink upper surface insulating layer ranges from 5 mm to 10 mm.
In the scheme, the liquid working medium is always kept on the upper surface of the heat sink, and the tail end of the capillary tube is immersed by the liquid level.
In the above scheme, the capillaries are arranged in an equidistant array, and the distance between the adjacent capillaries is not less than 10 mm.
A control method of the self-circulation phase-change cooling device based on the electric drive technology comprises the following steps:
filling a cooling liquid working medium into the liquid storage tank, tightly connecting the bottom heat sink with the surface to be cooled, and simultaneously opening the high-voltage electrostatic generator;
the liquid working medium in the liquid storage tank flows downwards from the capillary to the surface of the heat sink under the action of electrostatic force, and the liquid level is higher than that of the liquid on the surface of the heat sink and the tail end of the capillary is immersed;
the liquid working medium is heated and evaporated on the surface of the heat sink, the gas pressure near the heat sink rises along with the evaporation of the liquid working medium, the gas working medium continuously moves upwards along the steam channel under the action of pressure difference and is condensed near the condenser at the top, the condenser discharges heat to the outside in time, and the liquefied liquid working medium falls down and is recovered to a liquid storage tank below;
and repeating the steps to realize the liquid phase/gas phase state conversion and self circulation of the cooling working medium in the device shell under the action of the electrostatic force and the pressure.
Compared with the prior art, the invention has the beneficial effects that: the invention utilizes the electrowetting technology to drive the cooling working medium to flow, thereby obviously improving the working medium circulation capacity and the cooling heat exchange performance of the device; meanwhile, the high-voltage electrostatic generator is used as the only energy input of the cooling device, has the characteristics of high voltage and low current, and greatly reduces the energy consumption of equipment; the device has good sealing performance, realizes self circulation of the liquid working medium by the action of pressure and electrostatic force, and has high operation stability; the evaporation and condensation processes of the working medium respectively occur near the surface of the bottom heat sink and the top condenser, the integral integration degree of the device is higher, and the heat sink shape and the capillary array scheme can be adjusted according to the structural characteristics of the surface to be cooled. The invention realizes the control of the circulation flow of the cooling working medium by utilizing the high-voltage electrostatic technology, and can obviously improve the cooling capacity of the device.
Drawings
FIG. 1 is a schematic structural diagram of a self-circulating phase change cooling device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electrical drive configuration of one embodiment of the present invention;
FIG. 3 is a capillary array arrangement according to one embodiment of the present invention.
In the figure: 1. a high voltage electrostatic generator; 2. a pressure relief valve; 3. a condenser; 4. an overflow plate; 5. a liquid storage tank; 6. a steam channel; 7. a capillary tube; 8. an insulating layer; 9. a heat sink.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 shows a preferred embodiment of the self-circulation phase change cooling device based on the electric driving technology, which comprises a device shell, a high-voltage electrostatic generator 1, a condenser 3, an overflow plate 4, a liquid storage tank 5, a vapor channel 6, a capillary tube integrated plate, a plurality of capillary tubes 7, an insulating layer 8 and a heat sink 9.
The overflow plate 4 is vertically arranged in the device shell, and the inner part of the device shell is divided into a liquid storage tank 5 and a steam channel 6; the bottom of the liquid storage tank 5 is provided with a capillary tube integrated plate, and the capillary tube integrated plate is provided with a plurality of capillary tubes 7; the capillary 7 is connected with the high-voltage electrostatic generator 1 to form a contact type charge mode; the heat sink 9 is positioned at the bottom in the device shell and below the capillary 7, the upper surface of the heat sink 9 is covered with an insulating layer 8 and is grounded, and a high-voltage electrostatic field is formed between the heat sink 9 and the capillary 7; the steam channel 6 is used for condensing and recycling the evaporated gas-phase working medium; the condenser 3 is arranged right above the liquid storage tank 5; under the action of electrostatic force, liquid in the liquid storage tank 5 continuously overcomes pressure and capillary resistance and flows downwards from the capillary 7 to the surface of the heat sink 9, liquid working medium is heated and evaporated on the surface of the heat sink 9, the gas pressure near the heat sink 9 rises along with the rise of the pressure, gas-phase working medium continuously moves upwards along the steam channel 6 under the action of pressure difference and is condensed near the top condenser 3, the condenser 3 timely discharges heat to the outside, and the liquefied working medium falls and is recovered into the liquid storage tank 5 below.
The device shell and the overflow plate 4 are made of insulating materials, the capillary integrated plate is made of metal materials and is connected with the high-voltage electrostatic generator 1, and a strong needle-plate non-uniform electric field is formed between the capillary integrated plate and the grounded heat sink 9.
The cooling working medium is low-boiling-point volatile dielectric liquid.
The cooling device has good sealing performance and also comprises a pressure release valve 2; the pressure relief valve 2 is mounted on the device housing.
The capillary 7 is made of metal, and according to the embodiment, the pore diameter is preferably in the range of 100-500 μm.
The upper surface of the heat sink 9 is coated with an insulating layer 8, preferably with a thickness of 100 and 200 μm according to the present embodiment, to prevent electrostatic breakdown.
According to the present embodiment, it is preferable that the distance H of the capillary 7 from the heat sink upper surface insulating layer 8 is in the range of 5-10 mm.
The upper surface of the heat sink 9 is always kept with liquid working medium, and the liquid level submerges the tail end of the capillary 7.
According to the present embodiment, it is preferable that the capillaries 7 are arranged in an equidistant array, and the distance between adjacent capillaries is not less than 10 mm.
A control method of the self-circulation phase-change cooling device based on the electric drive technology comprises the following steps:
filling a cooling liquid working medium into the liquid storage tank 5, tightly connecting the bottom heat sink 9 with a surface to be cooled through heat-conducting silicone grease, and simultaneously opening the high-voltage electrostatic generator 1;
under the action of electrostatic force, the liquid working medium in the liquid storage tank 5 continuously overcomes pressure and capillary resistance and flows downwards from the capillary 7 to the surface of the heat sink 9, and the liquid level is preferably higher than the liquid level on the surface of the heat sink 9 and submerges the tail end of the capillary 7; the whole device is sealed, and a pressure release valve 2 is additionally arranged to ensure the operation safety of the device;
the liquid working medium is heated and evaporated on the surface of the heat sink 9, the gas pressure near the heat sink 9 rises along with the evaporation, the gas working medium continuously moves upwards along the steam channel 6 under the action of pressure difference and is condensed near the condenser 3 at the top, the condenser 3 timely discharges heat to the outside, and the liquefied liquid working medium falls and is recovered to the liquid storage tank 5 below;
and repeating the steps to realize the liquid phase/gas phase state conversion and self circulation of the cooling working medium in the device under the comprehensive action of the electrostatic force and the pressure.
The high-voltage electrostatic generator 1 is connected with the capillary 7, and preferably can generate voltage in the range of 0-10 kV; the pressure release valve 2 is used for guaranteeing the operation safety of the device; the condenser 3 is positioned right above the liquid storage tank 5 and used for condensing the superheated steam and exchanging heat with the outside; the overflow plate 4 is vertically arranged, and the whole device is roughly divided into a liquid storage tank 5 and a steam channel 6; the capillaries 7 are positioned at the bottom of the liquid storage tank 5 and used for conveying liquid working media to the surface of the heat sink 9; after being evaporated on the surface of the heat sink 9, the liquid working medium flows upwards from the steam channel 6 to the vicinity of the condenser 3 for condensation.
Fig. 2 shows an embodiment of the electrically driven structure of the present invention, in which the capillary 7 is made of metal and is connected to the high voltage electrostatic generator 1 to form a contact type charging mode; the heat sink 9 is grounded, and the upper surface is covered with an insulating layer 8, according to the present embodiment, the preferred thickness range is 100-; according to the present embodiment, it is preferable that the distance H between the capillary 7 and the heat sink insulation layer 8 is in the range of 5-10mm, and the capillary 7 is immersed in the liquid working medium.
Fig. 3 shows an embodiment of the capillary array arrangement of the present invention, in which the plurality of capillaries 7 are integrated on a metal bottom plate, connected to the high voltage electrostatic generator 1, and enclose the liquid storage tank 5 with the overflow plate 4; according to the embodiment, the aperture range of the capillary is preferably 100-500 μm, so as to prevent the liquid working medium from flowing out of the reservoir in a large amount due to the action of gravity; according to the present embodiment, it is preferable that the pitch L of the adjacent capillaries 7 is not less than 10mm to exclude mutual electrostatic interference.
According to the embodiment, preferably, the device shell and the overflow plate 4 are made of insulating materials, the capillary tube 7 integration plate is made of metal materials, and is connected with the high-voltage electrostatic generator 1 to form a strong needle-plate non-uniform electric field with the grounding heat sink 9; further, the high-voltage electrostatic generator 1 continuously charges the liquid working medium in the liquid storage tank 5, and the liquid overcomes the pressure to flow from the capillary 7 to the surface of the heat sink 9 to exchange heat under the electrostatic action; static electricity can weaken the surface tension of the liquid working medium to a certain extent, accelerate the flow of the liquid on the surface of the heat sink 9, and further promote the spreading and heat exchange process of the cooling working medium;
according to the embodiment, preferably, the cooling working medium is a low-boiling-point and volatile liquid, such as fluorinated liquid HFE-7100, the boiling point of which is 61 ℃, and the phase-change heat exchange can be realized at a lower temperature, so that the cooling working medium is particularly suitable for rapidly cooling high-power precise electronic components.
The working process of the self-circulation phase change cooling device based on the electric drive technology comprises the following steps:
firstly, a certain amount of cooling working medium is filled into the liquid storage tank 5, and the liquid level is higher than that of the liquid on the surface of the heat sink 9, so that the capillary 7 is immersed; then the whole device is sealed, and a pressure release valve 2 is additionally arranged to ensure the operation safety of the device; tightly connecting the bottom heat sink 9 with the surface to be cooled through the heat-conducting silicone grease, and simultaneously opening the high-voltage electrostatic generator 1;
the liquid working medium is heated and evaporated on the surface of the heat sink 9, the gas pressure near the heat sink 9 rises along with the liquid working medium, under the action of pressure difference, the working medium steam continuously moves upwards along the right-side steam channel 6 and is condensed near the condenser 3 at the top, the condenser discharges heat to the outside in time, and the liquefied working medium falls and is recovered to the liquid storage tank 5 below;
the liquid in the liquid storage tank 5 continuously overcomes the pressure and the capillary resistance to flow downwards from the capillary 7 to the surface of the heat sink 9 under the action of electrostatic force, and the downward flow rate of the liquid can be adjusted by adjusting the magnitude of the external voltage so as to adapt to different cooling working condition requirements;
the above steps are repeated, and the liquid phase/gas phase state conversion and self circulation of the cooling working medium in the device shell can be realized under the comprehensive action of the electrostatic force and the pressure.
According to the invention, a liquid working medium is subjected to evaporation phase change on the surface of a heat sink 9, so that the pressure nearby is increased, working medium steam moves upwards along a steam channel 6 under the action of pressure difference driving, further performs heat exchange condensation with the outside through a condenser 3, and the condensed liquid working medium falls into a liquid storage tank 5 below; the bottom of the liquid storage tank 5 is provided with a plurality of metal capillary tubes 7 which are connected with the high-voltage electrostatic generator 1, and the liquid working medium in the liquid storage tank 5 continuously flows to the surface of the heat sink 9 from the capillary tubes 7 under the electrostatic action.
The invention takes the electrostatic force as the driving force to drive the cooling working medium to realize circulation, and is particularly suitable for the precise and efficient cooling of high-heat-flow-density electronic components. Meanwhile, the external voltage can be changed according to the surface temperature distribution condition of the heat sink to adjust the circulation rate of the working medium, so that the cooling and heat exchange capacity is adjusted, and the waste of the working medium and the evaporation loss condition are effectively avoided.
It should be understood that although the specification has been described in terms of various embodiments, not every embodiment includes every single embodiment, and such description is for clarity purposes only, and it will be appreciated by those skilled in the art that the specification as a whole can be combined as appropriate to form additional embodiments as will be apparent to those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A self-circulation phase change cooling device based on an electric drive technology is characterized by comprising a device shell, a high-voltage electrostatic generator (1), a condenser (3), an overflow plate (4), a liquid storage tank (5), a steam channel (6), a capillary tube integrated plate, a plurality of capillary tubes (7), an insulating layer (8) and a heat sink (9);
the overflow plate (4) is vertically arranged in the device shell, and the inner part of the device shell is divided into a liquid storage tank (5) and a steam channel (6); the bottom of the liquid storage tank (5) is provided with a capillary tube integrated plate, and the capillary tube integrated plate is provided with a plurality of capillary tubes (7); the capillary tube (7) is connected with the high-voltage electrostatic generator (1); the heat sink (9) is positioned at the bottom in the device shell and below the capillary tube (7), and the upper surface of the heat sink (9) is covered with an insulating layer (8) and is subjected to grounding treatment; the steam channel (6) is used for condensing and recycling the evaporated gas-phase working medium; the condenser (3) is arranged right above the liquid storage tank (5); liquid working media in the liquid storage tank (5) flow downwards to the surface of the heat sink (9) from the capillary tube (7) under the action of electrostatic force, the liquid working media are heated and evaporated on the surface of the heat sink (9) to form gas-phase working media, the gas-phase working media move upwards along the steam channel (6) and are condensed near the top condenser (3), the condenser (3) discharges heat to the outside, and the liquefied working media fall and are recovered into the liquid storage tank (5) below.
2. The self-circulating phase change cooling device based on electric drive technology of claim 1, characterized in that the device housing and the overflow plate (4) are made of insulating material, and the capillary manifold plate is made of metal material.
3. The electrically driven technology based self-circulating phase change cooling device of claim 1 wherein the liquid working substance is a low boiling point, volatile dielectric liquid.
4. The self-circulating phase change cooling device based on electric drive technology of claim 1, characterized by further comprising a pressure relief valve (2); the pressure relief valve (2) is mounted on the device housing.
5. The self-circulation phase-change cooling device based on the electric drive technology as claimed in claim 1, wherein the capillary tube (7) is made of metal and has a pore size in the range of 100-500 μm.
6. Self-circulating phase change cooling device based on electric drive technology according to claim 1, characterized in that the heat sink (9) is spin coated with an insulating layer (8) on its upper surface with a thickness in the range of 100 and 200 μm.
7. Self-circulating phase change cooling device based on electrical drive technology according to claim 1, characterized in that the capillary (7) is at a distance H in the range of 5-10mm from the top surface insulation layer (8) of the heat sink.
8. Self-circulating phase change cooling device based on electric drive technology according to claim 1, characterized in that the upper surface of the heat sink (9) always holds liquid working medium and the liquid level submerges the end of the capillary tube (7).
9. Self-circulating phase change cooling device based on electric drive technology according to claim 1, characterized in that the capillaries (7) are arranged in an equidistant array with a neighboring capillary spacing not less than 10 mm.
10. A control method of a self-circulation phase change cooling device based on electric drive technology according to any one of claims 1-9, characterized by comprising the following steps:
filling a cooling liquid working medium into the liquid storage tank (5), tightly connecting the bottom heat sink (9) with the surface to be cooled, and simultaneously opening the high-voltage electrostatic generator (1);
the liquid working medium in the liquid storage tank (5) flows downwards from the capillary (7) to the surface of the heat sink (9) under the action of electrostatic force, and the liquid level is preferably higher than the liquid level on the surface of the heat sink (9) and submerges the tail end of the capillary (7);
the liquid working medium is heated and evaporated on the surface of the heat sink (9), the gas pressure near the heat sink (9) rises along with the evaporation, the gas working medium continuously moves upwards along the steam channel (6) under the action of pressure difference and is condensed near the condenser (3) at the top, the condenser (3) timely discharges heat to the outside, and the liquefied liquid working medium falls down and is recovered to the liquid storage tank (5) below;
and repeating the steps to realize the liquid phase/gas phase state conversion and self circulation of the cooling working medium in the device shell under the action of the electrostatic force and the pressure.
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| CN102997729A (en) * | 2012-12-24 | 2013-03-27 | 天津商业大学 | Heat pipe radiator of phase change drive loop |
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| CN102997729A (en) * | 2012-12-24 | 2013-03-27 | 天津商业大学 | Heat pipe radiator of phase change drive loop |
| CN103759563A (en) * | 2014-02-21 | 2014-04-30 | 电子科技大学 | Micro-channel heat dissipation device achieving heat transfer through phase-change circulating motion of working medium |
| CN208554664U (en) * | 2018-05-17 | 2019-03-01 | 江苏大学 | A kind of electrostatic atomization cooling system for high heat flux density surface |
| CN208368683U (en) * | 2018-05-30 | 2019-01-11 | 华南理工大学 | A kind of power battery compound thermal management system based on Natural Circulation |
| CN111642103A (en) * | 2020-04-29 | 2020-09-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High heat flow density porous heat sink flow cooling device |
| CN111726973A (en) * | 2020-07-22 | 2020-09-29 | 中国科学院大学 | Device and method for cooling high-heat-flux-density device by using magnetic field |
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