CN100506004C - Remote passive circulating phase-change heat-diffusing method and system - Google Patents

Remote passive circulating phase-change heat-diffusing method and system Download PDF

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CN100506004C
CN100506004C CNB2005100987334A CN200510098733A CN100506004C CN 100506004 C CN100506004 C CN 100506004C CN B2005100987334 A CNB2005100987334 A CN B2005100987334A CN 200510098733 A CN200510098733 A CN 200510098733A CN 100506004 C CN100506004 C CN 100506004C
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heat
micro
free convection
channel
microflute
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CN1929727A (en
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胡学功
赵耀华
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Institute of Engineering Thermophysics of CAS
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Institute of Engineering Thermophysics of CAS
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Abstract

This invention relates to remote passive recycle phase dissipation system and method, wherein, the system comprises the following parts: one vapor filled with liquid work medium with its heat surface set with micro tanks group; the vapor top and end inner wall is set with crossed micro tanks; one pair of natural condenser inner wall is distributed with open condense micro tanks; the inner chamber bottom is set with inclination with several guide micro tanks.

Description

A kind of long-range passive type circulating phase-change heat method and cooling system
Technical field
The present invention relates to a kind of radiation cooling method of electric components and parts, particularly be applied to the long-range passive type circulating phase-change heat method and the cooling system of various high-performance calculation machine chips and great-power electronic electric component.
Background technology
At present, both at home and abroad to electric components and parts particularly the cooling great majority of computer chip adopt single fin in conjunction with fan in the residing locational space of heating electronic device, carry out local air cooling and single utilize the high-efficiency heat conduction flow of liquid through heating electronic device position by carry out the single-phase convection heat exchange with the contacted heat-conducting metal wall of heating electronic device and by liquid with the local single-phase liquid forced-convection heat transfer dual mode of heat transportation to electric system outside.Wherein, utilizing fan to carry out local air cooling is the most widely used at present radiating mode, this technology is sticked on aluminum thermal fin on the computer chip surface usually, and on both contact-making surfaces, smear heat conductive silica gel (silicone grease) to reduce thermal conduction resistance, utilize aluminum thermal fin to increase the heat convection area, carry out forced convertion air cooling with small-sized fans again, will be lost to the computer cabinet environment by fin surface from the heat that chip is derived and go, thereby reach the effect that makes the chip cooling.The design of fin cooperates with fan, has determined the quality of this air cooling mode radiating effect.But along with the improving constantly of microelectronic chip integrated level, the continuous increase of clock frequency and constantly reducing of chip size, chip energy consumption and heat dissipation problem also become increasingly conspicuous, the combination of fin and fan is difficult to satisfy the cooling requirement of high performance chips near the limit load state on the market at present.The major defect of the air-cooled technology in this this locality is: there is power consumption in the running of fan, and increases along with the raising of chip frequency; Simultaneously, raising along with the power density of electric components and parts or chip, the area of dissipation of the fin in this cooling device has to increase, make whole cooling device need take bigger volumetric spaces, this can't realize now and in the narrow space of following increasing electric system or computer.Exactly because and be subjected to the restriction in this little space, make the heat radiation total capacity of whole device to be further improved.In addition, because at the electric system equipment or the computer cabinet internal work that seal, the noise of this cooling device is bigger.Single local single-phase liquid forced-convection heat transfer radiating mode is based on then that the liquid heat capacity is big, thermal conductivity is high, can be under controlled fully situation, make heat finish the directed principle that shifts, utilize the circulation line of special-purpose cooling fluid, conducting-heat elements, pump, valve and connection, heat with the chip generation, by circulating in the high-efficiency heat conduction liquid in the pipeline, transfer to electric rapidly or the computer system external environment condition in go, thereby reach the effect that reduces electric or chip temperature.The unitary construction of this local single-phase liquid forced-convection heat transfer heat abstractor is the liquid circulation cooling system of a complete closed.The defective of this system mainly is: the device complexity of this radiating mode, the power of the required consumption of pressure drop in the time of must overcoming boiler water circulation, the liquid circulation cooling system of whole sealing almost all be in electric or computer function internal system space in, thereby very high to the sealing requirements of cooling system.
The inventor's ZL021306257 patent, disclosing a kind of also is the local radiating mode that cold junction adopts the combination that is similar to fin and fan, there is power consumption in the running of fan, and increases along with the raising of chip frequency; Simultaneously, the required area of dissipation of cold junction is just big more, and this is difficult to realize in the narrow space of computer, thereby has limited the significantly raising of heat radiation total capacity.Though this method hot junction heat-obtaining mode does not have power consumption, is the passive type heat-obtaining; But the exotherm of cold junction has adopted fan, has power consumption, is active heat release, and therefore, on the angle of whole system, this heat dissipating method in fact still belongs to the active heat radiation that there is power consumption a kind of this locality.
Summary of the invention
The objective of the invention is to: solve that the efficient that existing local wind-cooling heat dissipating technology exists is low, noise is big, power consumption is high, need take the limited function space of bigger electric system or computer, the technological deficiency of heat-sinking capability deficiency; Also to solve power consumption height, device that existing single local single-phase liquid forced-convection heat transfer heat dissipation technology exists complicated, need to adopt fluidic such as pump valve and need the technological deficiency of higher seal request, be transported to long-range condenser and external environment by steam through the insulation pipeline through phase transformation heat-obtaining in heat-obtaining unit in the short space, heat and carry out the heat release of large space natural air cooling, condensed liquid transport and return the method that the heat radiation of circulation successively of heat-obtaining unit is cooled off thereby provide a kind of; And provide a kind of have no power consumption, quiet, the heat-obtaining area is little, the heat radiation density of heat flow rate is high and big a kind of long-range passive type circulating phase-change heat method and the cooling system of heat radiation total capacity.
Technical scheme of the present invention is such:
Long-range passive type circulating phase-change heat method provided by the invention comprises:
1. directly in the place that heater need dispel the heat, its heat-obtaining area is set and needs the suitable local heat-obtaining element of area of dissipation, i.e. a seal chamber, its inwall has many open micro-channel, forms open microflute group, and inside cavity has liquid working substance; The heat-obtaining face of local heat-obtaining element is attached to heater, liquid working substance in the local heat-obtaining element can form many thin liquid films zone by surface tension in micro-channel, realize high-intensity evaporation and boiling in the heat affected zone of liquid working substance in the microflute group in the microflute group, become steam and take away the heat that heater produces;
With steam insulation flexible pipe and one or more return flexible hose that can form the capillary force driving action as heat and fluid transport device, be connected between local heat-obtaining element and the free convection formula condenser, form a system to outer closure; This cooling system has intrasystem absolute pressure and is in 0.1~50kPa scope;
3. on free convection formula condenser outer surface, radiated rib is set then, be furnished with the vertically open microflute that condenses with its inwall, make steam condensation heat in free convection formula condenser, under capillary effect, condensation water along continuous straight runs in the open microflute that condenses of free convection formula condenser inwall flows to microflute trough valley zone, make the liquid film attenuate at place, groove top, condensate liquid then is excreted to the bottom of condenser along the trough valley from top to down; The heat that vapor condenses discharged is transmitted on the rib surface of free convection formula condenser outer walls by free convection formula condenser inwall, finally be lost in the external environment by carrying out large tracts of land heat transfer free convection, realize the long-range lost purpose of heat of system with external environment;
4. again by the condensation water of return flexible hose,, flow back in the local heat-obtaining element, thereby finish the circulation of a heat-obtaining and heat release, reach and make the heater cooling purpose by means of the effect of gravity and capillary force with long-range free convection formula condenser bottom.
Long-range passive type circulating phase-change heat provided by the invention system, comprise: an annular seal space that vacuumizes, and the evaporator 3 that perfusion fluid working medium forms in it, the micro-channel 2 of this evaporator 3 are arranged on the inner surface of heating surface of annular seal space, form the microflute group, shown in Fig. 1 a and Fig. 1 b; It is characterized in that the top that also is included in evaporator 3 has steam (vapor) outlet and the bottom has inlet, and crisscross micro-channel 4 (as shown in Figure 2) is set on top and bottom interior wall; One annular seal space of being made by thermal conductive metallic material that vacuumizes is a free convection formula condenser 6, the side inwall of this free convection formula condenser 6 is the vertical open microflute 10 that condenses of distribution vertically, with open a condensate outlet 13 in bottom center, and bottom interior wall makes the slope 11 in order to rapid collection condensation water, it is low to form condensate outlet 13 places, the structure (shown in Fig. 3 a) that the inwall both sides are high can utilize the effect of gravity and capillary force to quicken compiling of condensation water; Slope, slope upper edge length direction is furnished with water conservancy diversion microflute 9, and the vertical fin 7 of heat transmission is set on 6 liang of lateral surfaces of free convection formula condenser, forms fin group (shown in Fig. 3 b); One end of heat-preserving hose 5 links to each other with the steam (vapor) outlet of evaporator 3, and the steam inlet of the other end and free convection formula condenser 6 joins; One end of return flexible hose 8 links to each other with condensate outlet 13 places of free convection formula condenser 6, and the inlet of the other end and evaporator 3 joins (as shown in Figure 4); Install capillary wick additional in the described return flexible hose 8, be used for increasing the capillary force that makes condensate liquid flow back into evaporator 3 rapidly.
In above-mentioned technical scheme, described evaporator 3 is made by thermal conductive metallic material, for example metallic copper, metallic aluminium or stainless steel; The micro-channel 2 that is provided with on evaporator 3 internal faces (as shown in Figure 1a) vertically arranged evenly, the geometry of this micro-channel is the conduit of rectangular duct, triangle conduit, trapezoidal conduit or U-shaped, all in 0.01-1mm scope, the spacing between the micro-channel is in 0.01-1mm scope for the width of conduit and the degree of depth.The size of described micro-channel 2 can be drawn into the liquid working substance on described micro-channel limit in the micro-channel 2 to be fit to forming capillary force.
The width of described crisscross micro-channel and the degree of depth are in 0.01-1mm scope, and the spacing between the micro-channel is (as shown in Figure 2) in 0.01-1mm scope; Described crisscross micro-channel and micro-channel 2 (form microflute group heat sink) are formed and are connected conduit, form continuous capillary attraction effect, with the timely backflow that guarantees condensation water in the free convection formula condenser with avoid in the steam pipe along the obstruction of journey condensate liquid to venthole.
In above-mentioned technical scheme, described free convection formula condenser 6 is made by the higher metal material of conductive coefficient, for example metallic copper, metallic aluminium or stainless steel.Free convection formula condenser inwall vertically is densely covered with many vertically open microflutes 10 that condense, the geometry of microflute 10 of condensing is trapezoidal, triangle or waveform, condense the width of microflute 10 and the degree of depth in 0.01-10mm scope, condense spacing between the microflute in the 0.01-20mm scope, shown in Fig. 3 c and Fig. 3 d.The outer surface of free convection formula condenser 6 vertically is densely covered with vertical miniature fin 7, forms the fin group, and wherein all in the scope of 0.1-20mm, spacing of fins is in 0.1-20mm scope for the height of fin 7 and width.
In above-mentioned technical scheme, all in 0.01-1mm scope, the spacing between the water conservancy diversion micro-channel is in 0.01-1mm scope for the width of the water conservancy diversion micro-channel 9 on the slope of described free convection formula condenser inside and the degree of depth.
In above-mentioned technical scheme, the internal diameter of described steam insulation flexible pipe is directly made by the less crooked arbitrarily material of energy of conductive coefficient in the scope of 1-20mm, is selected from polyurethane tube; Or adopt softer metal material and add thermal insulation casing and make at pipe.The steam that this heat-preserving hose plays a part to produce in the evaporator with this locality is transported in the long-range free convection formula condenser and goes.
In above-mentioned technical scheme, an end of described return flexible hose links to each other with the condensate outlet place of free convection formula condenser, and the inlet of the other end and evaporator joins.The internal diameter of return flexible hose by making by crooked arbitrarily material, is selected from polyurethane tube in the scope of 0.1-10mm, can form the capillary force effect.Can install capillary wick in the return flexible hose additional and be used for increasing the capillary force that makes condensate liquid flow back into evaporator rapidly.Capillary wick is the solid material of porous, installs capillary wick additional along tube axial direction in the described return flexible hose, and this capillary wick is 2 layer of 250 purpose stainless steel wire web-roll core.Return flexible hose can utilize the effect of gravity and capillary force that the condensate liquid that condenses in the long-range free convection formula condenser is transported back local evaporator.
Technique effect:
Domestic and international research shows, overall characteristic that flows and conduct heat in the microchannel and the result in the large scale passage have a great difference, the evaporation and the boiling of working medium have high intensity in the micro-channel, the extraordinary phenomenon that belongs to the heat and mass under the yardstick between microvoid, for example the highest heating density of heat flow rate of high-performance calculation machine chip is taller goes out about two orders of magnitude than present great-power electronic electric components for the theoretical limit of its phase transformation heat of evaporation current density, is a kind of high performance cooling heat dissipation mode.Local heat-obtaining element (micro capillary groove evaporator 3) among the present invention has been owing to adopted the evaporation and the boiling heat transfer principle of working medium in the micro-channel, its size may diminish to the heating face of very little electric components and parts for example the size of high-performance calculation machine chip be complementary; Simultaneously, the free convection formula condenser among the present invention is arranged in the space beyond the function system away from electronic electric equipment, can and external environment between by large space heat transfer free convection dissipated heat.In addition, heat among the present invention and fluid transport device have adopted capillary pump two-phase aspiration circuit principle, and the heat of the high heat flux that local heat-obtaining element can be got in time is transported to far.Therefore, the present invention is by local heat-obtaining element (micro capillary groove evaporator), heat and fluid transport device, long-range cartridge element (free convection formula condenser) three's combination can size in the narrow space is small the caloric value of the high heat flux that produced of great-power electronic electric components be lost in time in the extraneous large environmental space in strange land and go, and need not as some traditional heat-dissipating types of cooling, must put the bigger fin of volume at the residing confined space lining of electric components and parts of heating for strengthening the heat convection cooling, electric fan and relevant heat radiation cooling-part, thereby can save the functional space of electronic electric equipment system significantly, realize the long-range of entire heat dissipation system, quiet, no power consumption, high-intensity heat radiation cooling purpose.
In sum, the different part that has that the present invention and prior art have is:
1. cooling system of the present invention is strange land (long-range) heat radiation, is not local heat radiation;
2. cooling system of the present invention does not have fan, no power consumption, be the entirely passive type heat radiation, is passive type though prior art also has the heat-obtaining mode, and the heat release link has fan, and power consumption is arranged, thereby from the angle of whole system, still belongs to active heat radiation;
3. though the heat-obtaining link of cooling system of the present invention is identical with prior art, but cooling system of the present invention highlights the associating heat exchange pattern that thin liquid film evaporates and thick liquid film seethes with excitement in the micro-channel, and existing technology is only emphasized the single heat exchange pattern of the thin liquid film evaporation in the micro-channel.
4. cooling system of the present invention has long-range heat and fluid transport pipeline device, and unique free convection formula condenser structure, can utilize the large tracts of land radiating surface of free convection formula condenser, realize and the efficiently radiates heat of external environment that existing technology does not then have.
Description of drawings
Fig. 1 a is the micro-channel structural plan schematic diagram in the evaporator of the present invention
Fig. 1 b is the micro-channel generalized section in the evaporator of the present invention
The crisscross micro-channel structural plan schematic diagram of Fig. 2 evaporator inside
The bottom ramp structure cutaway view of Fig. 3 a free convection formula condenser
The side sectional view of Fig. 3 b free convection formula condenser
Fig. 3 c is the micro groove structure schematic diagram that condenses on the free convection formula condenser inwall of the present invention
Fig. 3 d is the microflute generalized section of condensing on the free convection formula condenser inwall of the present invention
Fig. 4 is that the long-range passive type circulating phase-change heat of the present invention system forms schematic diagram
Drawing is described as follows:
Heater-1; Micro-channel-2; Micro capillary groove evaporator-3;
Microflute-4 in length and breadth; Steam insulation flexible pipe-5; Free convection formula condenser-6;
Fin-7; Return flexible hose-8; Water conservancy diversion micro-channel-9
Microflute-10 slope-11 steam inlet-12 condenses
Condensate outlet-13
Embodiment
Embodiment 1
Below in conjunction with drawings and Examples the present invention is described in detail:
Referring to Fig. 4, make a kind of long-range passive type circulating phase-change heat system.It comprises that one is made a rectangle seal chamber with the good metallic copper of thermal conductivity, and the evaporator 3 by vacuumizing formation, also can be called the heat-obtaining element.The top of this evaporator 3 has steam (vapor) outlet and the bottom has inlet, and crisscross micro-channel 4 (as shown in Figure 2) is set on top and bottom interior wall.Have rectangle micro-channel 2 on the inwall of its micro capillary groove evaporator 3 cavity heating surfaces, form the microflute group, also can be called micro capillary groove evaporator 3.The spacing of this micro-channel 2 is that the width of 0.3mm, micro-channel 2 is that the 0.2mm and the conduit degree of depth are 0.7mm.The size of described rectangle micro-channel 2 is fit to form stronger capillary force, with with absolute ethyl alcohol in the micro capillary groove evaporator 3 or distilled water etc., liquid working substance with higher latent heat of vaporization, be drawn into high-intensity evaporation of formation and boiling in the heat affected zone in the micro-channel 2 by micro-channel 2, become steam to take away the heat that heater produces.The outer surface of present embodiment micro capillary groove evaporator 3 cavity heating surfaces is close together by heat conductive silica gel (silicone grease) and heater 1 outer surface.
The free convection formula condenser 6 of present embodiment, it is the good metal of a usefulness thermal conductivity, for example metallic aluminium or copper become a rectangle seal chamber, its inwall is provided with many vertically open trapezoidal microflutes 10 that condense, condense the width of microflute 10 and the degree of depth all at 1.5mm, condense spacing between the microflute 10 at 0.5mm, shown in Fig. 3 c and Fig. 3 d.The both sides of free convection formula condenser 6 outer surfaces respectively are furnished with vertical 38 rectangle fins 7 of heat transmission, form the fin group; This fin is the metal aluminium flake, and it highly is 10mm, and width is 1mm, and spacing of fins is 2mm.Open condensate outlet 13 at inner bottom surface center, free convection formula condenser 6 chamber, and (condensate outlet 13 places are minimum to make slope 11 in the bottom surface, the structure that both sides are high), the angle on slope is 45 °, leave rectangle water conservancy diversion micro-channel 9 on its slope 11, the width of water conservancy diversion micro-channel 9 is 1.5mm, and the degree of depth is 2mm, and the spacing between the water conservancy diversion micro-channel is 1.5mm.
Heat-preserving hose 5, one ends of the polyurethane material that internal diameter is 4mm link to each other with the steam (vapor) outlet of micro capillary groove evaporator 3, and the steam inlet 12 of the other end and free convection formula condenser 6 joins; The polyurethane return flexible hose 8 that another root internal diameter is 3mm, the one end links to each other with condensate outlet 13 places of free convection formula condenser 6, the other end is connected with the inlet of micro capillary groove evaporator 3, and steam flow in the free convection formula condenser 6 by the heat-preserving hose 5 that links to each other with micro capillary groove evaporator 3.
The geometry that the microflute 10 that condenses on free convection formula condenser 6 inwalls of another embodiment can also be arranged, indention, shown in Fig. 3 c and Fig. 3 d, zigzag is condensed the width of microflute 10 and the degree of depth all in the 2mm scope, and the spacing between the microflute is at 0.6mm.Outer surface vertically is densely covered with vertical miniature fin 7, and wherein the height of fin is that 12mm and width are 2mm, and spacing of fins is 4mm.
This free convection formula condenser 6 vertically is placed on the outside of the cabinet or the rack of electronic electric equipment, perhaps is embedded in cabinet or the rack wall.Steam is mainly at open trapezoidal place, the microflute groove top condensation heat that condenses of free convection formula condenser 6 inwalls, under capillary effect, the condensation water along continuous straight runs flows to microflute trough valley zone, make the liquid film attenuate at place, groove top, condensate liquid then is excreted to the bottom of free convection formula condenser 6 along the trough valley from top to down, the bottom of free convection formula condenser 6 inside is furnished with the slope in order to rapid collection condensation water, slope, slope upper edge length direction is furnished with rectangle water conservancy diversion microflute, can utilize the effect of gravity and capillary force to quicken compiling of condensation water.The heat that vapor condenses discharged is transmitted to by free convection formula condenser 6 inwalls on rectangle fin 7 surfaces of free convection formula condenser 6 outer walls, finally is lost in the external environment by the heat transfer free convection of carrying out with external environment.The condensation water of free convection formula condenser 6 bottoms is then by return flexible hose 8, in time be back in the evaporator 3 by means of gravity with by crisscross microflute 4 on the condensate liquid refluxing opening place wall in return flexible hose 8, the micro capillary groove evaporator 3 and the 2 formed stronger continuous capillary attraction effects of evaporation microflute, thereby finish the circulation of a heat-obtaining and heat release, reach and make the heater cooling purpose.
Embodiment 2: the heating surface in the present embodiment heat-obtaining element (micro capillary groove evaporator) is the appearance heating face of heater.Promptly directly heater outer surface and micro capillary groove evaporator are made of one, carve cloth rectangle micro-channel, form the microflute group as the micro capillary groove evaporator internal heating surface and on its surface.Wherein steam insulation pipe 5 is made by copper tube, and coats plastic bushing outside copper tube, and other parts of present embodiment are with embodiment 1.
Embodiment 3: in the present embodiment, directly utilize the big wall of the cabinet of electronic electric equipment and rack to make thin free convection formula condenser, the free convection formula condenser among the internal structure of this free convection formula condenser and the embodiment 1 identical.Other parts of present embodiment are with embodiment 1.
Embodiment 4: in the present embodiment, install capillary wick additional along tube axial direction in the return flexible hose 8 and be used for increasing the capillary force that makes condensate liquid flow back into evaporator rapidly.Capillary wick is 2 layer of 250 purpose stainless steel wire web-roll core.Other parts of present embodiment are with embodiment 1.
Embodiment 5: the method that the long-range passive type circulating phase-change heat system that utilizes that embodiment 1 makes dispels the heat may further comprise the steps:
1. with the micro capillary groove evaporator 3 of the rectangle seal chamber of this system, be close together by heat conductive silica gel (silicone grease) and heater 1 outer surface, liquid working substance in the micro capillary groove evaporator 3 can form many thin liquid films zone by surface tension in micro-channel, realize high-intensity evaporation and boiling in the heat affected zone of liquid working substance in the microflute group in the microflute group, become steam and take away the heat that heater produces;
2. steam insulation flexible pipe, return flexible hose are connected between local heat-obtaining element and the free convection formula condenser, form a system outer closure; And making this cooling system have intrasystem absolute pressure, to be in 0.1~50kPa scope all passable;
3. on free convection formula condenser outer surface, radiated rib is set then, be furnished with the vertically open microflute that condenses with its inwall, make steam condensation heat in free convection formula condenser, under capillary effect, condensation water along continuous straight runs in the open microflute of free convection formula condenser inwall flows to microflute trough valley zone, make the liquid film attenuate at place, groove top, condensate liquid then is excreted to the bottom of condenser along the trough valley from top to down; The heat that vapor condenses discharged is transmitted on the rib surface of free convection formula condenser outer walls by free convection formula condenser inwall, finally be lost in the external environment by the large tracts of land heat transfer free convection of carrying out with external environment, thus the long-range lost purpose of heat of the system of realization;
4. again by the condensation water of return flexible hose,, flow back in the local heat-obtaining element, thereby finish the circulation of a heat-obtaining and heat release, reach and make the heater cooling purpose by means of the effect of gravity and capillary force with long-range free convection formula condenser bottom.

Claims (10)

1. long-range passive type circulating phase-change heat method comprises:
A. directly in place that heater need dispel the heat, one its heat-obtaining area is set and needs the suitable local heat-obtaining element of area of dissipation, this this locality heat-obtaining element is a seal chamber, and its inwall has many open micro-channel, form open microflute group, inside cavity has liquid working substance; The heat-obtaining face of local heat-obtaining element is attached to heater, liquid working substance in the local heat-obtaining element can form many thin liquid films zone by surface tension in micro-channel, realize high-intensity evaporation and boiling in the heat affected zone of liquid working substance in the microflute group in the microflute group, become steam and take away the heat that heater produces;
B. with steam insulation flexible pipe and the return flexible hose that can form the capillary force driving action as heat and fluid transport device, be connected between local heat-obtaining element and the free convection formula condenser, form a system to outer closure; This cooling system has intrasystem absolute pressure and is in 0.1~50kPa scope;
C. on free convection formula condenser outer surface, radiated rib is set then, be furnished with the vertically open microflute that condenses with its inwall, make steam condensation heat in free convection formula condenser, under capillary effect, condensation water along continuous straight runs in the open microflute of free convection formula condenser inwall flows to microflute trough valley zone, make the liquid film attenuate at place, groove top, condensate liquid then is excreted to the bottom of condenser along the trough valley from top to down; The heat that vapor condenses discharged is transmitted on the rib surface of free convection formula condenser outer walls by free convection formula condenser inwall, finally be lost in the external environment by the large tracts of land heat transfer free convection of carrying out with external environment, thus the long-range lost purpose of heat of the system of realization;
D. again by the condensation water of return flexible hose,, flow back in the local heat-obtaining element, thereby finish the circulation of a heat-obtaining and heat release, reach and make the heater cooling purpose by means of the effect of gravity and capillary force with long-range free convection formula condenser bottom.
2. long-range passive type circulating phase-change heat system, comprise: an annular seal space that vacuumizes of making by thermal conductive metallic material, and the evaporator (3) that perfusion fluid working medium forms in it, the micro-channel (2) of this evaporator (3) are arranged on the inner surface of heating surface of annular seal space, form the microflute group; It is characterized in that the top that also is included in evaporator (3) has steam (vapor) outlet and the bottom has inlet, and crisscross micro-channel (4) is set on top and bottom interior wall; One annular seal space of being made by thermal conductive metallic material that vacuumizes is a free convection formula condenser (6), the side inwall of this free convection formula condenser (6) is the vertical open microflute that condenses (10) of distribution vertically, with open a condensate outlet (13) in bottom center, and bottom interior wall makes in order to the slope of rapid collection condensation water (11), formation condensate outlet (13) is located low, the structure that the inwall both sides are high; Slope, slope upper edge length direction is furnished with water conservancy diversion microflute (9), on free convection formula condenser (6) two lateral surfaces the vertical fin of heat transmission (7) is set, and forms the fin group; One end of heat-preserving hose (5) links to each other with the steam (vapor) outlet of evaporator (3), and the steam inlet of the other end and free convection formula condenser (6) joins; One end of return flexible hose (8) is located to link to each other with the condensate outlet (13) of free convection formula condenser (6), and the inlet of the other end and evaporator (3) joins; Install 2 layer of 250 purpose stainless steel cloth capillary wick in the described return flexible hose (8) additional.
3. by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that, the micro-channel (2) that is provided with on the described evaporator internal face is a rectangular duct, the conduit of rectangle, triangle, trapezoidal or U-shaped, this micro-channel (2) is vertically arranged evenly, all in 0.01-1mm scope, the spacing between this micro-channel (2) is in 0.01-1mm scope for the width of this micro-channel (2) and the degree of depth.
4. by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that described free convection formula condenser (6) is made by thermal conductive metallic material; The vertically densely covered vertically open microflute that condenses (10) of this free convection formula condenser (6) inwall, the geometry of the described microflute that condenses (10) is trapezoidal, triangle or waveform, condense the width of microflute (10) and the degree of depth in 0.01-10mm scope, the spacing between the described microflute that condenses (10) is in the 0.01-20mm scope.
5. by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that all in the scope of 0.1-20mm, fin (7) spacing is in 0.1-20mm scope for the height of described fin (7) and width.
6. by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that all in 0.01-1mm scope, the spacing between the described water conservancy diversion micro-channel (9) is in 0.01-1mm scope for the width of described water conservancy diversion micro-channel (9) and the degree of depth.
7. by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that the geometry of described crisscross micro-channel (4) is rectangle, triangle, trapezoidal or U-shaped; The width of described crisscross micro-channel (4) and the degree of depth are in 0.01-1mm scope, and the spacing between the crisscross micro-channel (4) is in 0.01-1mm scope.
8. by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that, described steam insulation flexible pipe (5) is by making by crooked arbitrarily material, and this can be selected from polyurethane tube by crooked arbitrarily material, or employing is covered the plastic, thermal-insulation pipe in the outsourcing of metal copper pipe; Described return flexible hose (8) is by making by crooked arbitrarily material, and this can be selected from polyurethane tube by crooked arbitrarily material, or adopts metallic copper, stainless steel tube; Its steam insulation flexible pipe (5) and return flexible hose (8) internal diameter are in the scope of 1-20mm.
9. by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that described thermal conductive metallic material is selected from metallic copper, metallic aluminium or stainless steel.
10 by the described long-range passive type circulating phase-change heat of claim 2 system, it is characterized in that installs capillary wick additional along tube axial direction in the described return flexible hose, this capillary wick is 2 layer of 250 purpose stainless steel wire web-roll core.
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CN102123575B (en) * 2010-01-12 2012-10-24 纬创资通股份有限公司 Heat radiation module and portable electronic device provided with same
CN102235615A (en) * 2010-04-21 2011-11-09 中国科学院工程热物理研究所 Cavity-type light emitting diode lamp
CN102036512A (en) * 2010-12-29 2011-04-27 北大方正集团有限公司 Printed circuit board and fabricating method thereof
CN106839826A (en) * 2012-07-11 2017-06-13 边疆 A kind of passive heat dissipating method and application
CN103292195B (en) * 2013-06-21 2015-03-25 中国科学院工程热物理研究所 Split type LED lamp
CN106211726A (en) * 2016-09-21 2016-12-07 江苏科技大学 The phase-change radiation system of a kind of band porous inner rib plate and preparation method
CN110996618A (en) * 2019-12-10 2020-04-10 江苏南通申通机械有限公司 Water-cooling type phase change cooling method and device for data center and machine room
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