CN103203606B - Method for producing multi-cavity phase change temperature-equalization plate - Google Patents

Method for producing multi-cavity phase change temperature-equalization plate Download PDF

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CN103203606B
CN103203606B CN201210008326.XA CN201210008326A CN103203606B CN 103203606 B CN103203606 B CN 103203606B CN 201210008326 A CN201210008326 A CN 201210008326A CN 103203606 B CN103203606 B CN 103203606B
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aluminium alloy
cavity
lower house
aluminums
foam
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CN103203606A (en
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刘晓东
王子杰
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State Energy Research (beijing) Steady-State Heat And Mass Transfer Technology Research Institute Co Ltd
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State Energy Research (beijing) Steady-State Heat And Mass Transfer Technology Research Institute Co Ltd
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Abstract

The invention discloses a method for producing a multi-cavity phase change temperature-equalization plate, comprising the steps of: A, processing an aluminium alloy plate into an aluminium alloy lower shell with multiple cavities; B, producing an aluminium alloy upper shell matched with the aluminium alloy lower shell; C, producing multiple aluminium foam plates matched with the multiple cavities; D, arranging the multiple aluminium foam plates in the corresponding multiple cavities in the aluminium alloy lower shell to form an aluminium alloy lower shell assembly with multiple aluminium foam cavities; and E, buckling the aluminium alloy upper shell on the aluminium alloy lower shell assembly and performing sealing treatment. The method for producing the multi-cavity phase change temperature-equalization plate disclosed by the invention realizes reliable redundancy by forming the multiple full-separate sealing cavities in the temperature-equalization plate and meets the heat conduction needs of multiple heat sources.

Description

A kind of method manufacturing multi-cavity phase change temperature-equalization plate
Technical field
The present invention relates to a kind of manufacture method of temperature-uniforming plate.
Background technology
Along with the develop rapidly of the industries such as electronics, IT, communication, LED, solar energy, wherein the heating power of electronic element used is also improving constantly, heat flow density significantly promotes, traditional radiating subassembly is utilized to be difficult to well solve relevant hot arraign topic, particularly at the field of radiating such as IGBT (Insulated Gate BipolarTransistor, insulated gate bipolar transistor), communication power amplifier, high-power LED street lamp.
Traditional heat radiation is mainly with the radiating mode of thermal source radiation fin, by the heat exchange of hot fin and air, heat loss is fallen, but due to restrictions such as its structure space, material heat transfer characteristic and heat radiation module weight, structural strength and reliabilities, when running into high-power, high heat flux, traditional radiating mode cannot meet radiating requirements.Meanwhile, for IGBT, communication and military project electronics high power consumption field of radiating, the reliability of radiator and redundancy are the emphasis that must consider.
As shown in Figure 1, modular design all forms single seal chamber by airtight housing 1, liquid-sucking core and working solution to the operation principle of tradition phase transformation temperature-uniforming plate (Vapor Chamber), will be pumped into 1.3 × (10 in pipe -2~ 10 - 3) Pa negative pressure after fill with appropriate hydraulic fluid, make to be close to be full of liquid in the liquid-sucking core capillary wick of cavity inner wall after sealed.One end of cavity is evaporator section (bringing-up section), and the other end is condensation segment (cooling section).Liquid carburation by evaporation when one end of cavity is heated in capillary wick, steam flows to other end releasing heat and condenses into liquid under small pressure reduction in steam channel 3, and liquid flows back to evaporator section by capillary force or acting in fluid passage 4 of gravity.Endlessly, heat reaches the other end by one end of Vapor Chamber in circulation like this.
The heat flow density of tradition Vapor Chamber can reach 200W/cm2 ~ 300W/cm2, and its thermal resistance is 0.03W/ DEG C ~ 0.08W/ DEG C, and phase opposite heat tube has larger Heat transmission amount, and can meet the radiating requirements of multi-point heat sources.But; tradition temperature-uniforming plate generally only has a seal chamber; if temperature-uniforming plate local damage or inefficacy; to cause all electronic components (thermal source) of contacting with temperature-uniforming plate cannot the problem of proper heat reduction; especially in the equipment such as military project electronics, communication; it is often the normal operation of guarantee equipment; corresponding redundancy protecting measure will be increased in set of system; when one of them power amplifier is at circuit; or IGBT is when going wrong; the circuit of Redundancy Design or power supply will substitute the parts gone wrong, to ensure the normal use of communication or power-supply system.
If all these heater elements share a single cavity temperature-uniforming plate, just cannot reach the object of reliability redundancy, for this reason, be badly in need of a kind of novel redundancy multi-cavity phase change temperature-equalization plate of research and development.
Summary of the invention
The object of the present invention is to provide a kind of method manufacturing multi-cavity phase change temperature-equalization plate, all heater elements in set of system can be solved better and share the problem that single cavity temperature-uniforming plate cannot reach reliability redundancy.
According to an aspect of the present invention, a kind of method manufacturing multi-cavity phase change temperature-equalization plate provided, comprises the following steps:
A) aluminium alloy plate is processed into the aluminium alloy lower house with multiple cavity;
B) the aluminium alloy upper shell matched with described aluminium alloy lower house is made;
C) the multiple aluminums foam boards matched with described multiple cavity are made;
D) described multiple aluminums foam board is respectively installed in aluminium alloy lower house in corresponding multiple cavity, forms the aluminium alloy lower house assembly with multiple aluminum foam cavity;
E) described aluminium alloy upper shell is fastened on described aluminium alloy lower house assembly, and carry out encapsulation process.
Further, in described steps A) in, described aluminium alloy lower house has the sidewall processing sealed step, and is used for being formed the supporting construction of multiple cavity.
Further, at described step B) in, described aluminium alloy upper shell have match with described sealed step and described supporting construction respectively weld side and weld groove and the multiple fabrication holes corresponding with described multiple cavity.
Further, described step C) comprising:
C1) the multiple aluminums foam boards matched with described multiple cavity are cut out;
C2) the described multiple aluminums foam board cut out is carried out mold pressing process.
Further, described step C) also comprise:
C3) at the described step C2 of enforcement) after, utilize ultrasonic wave, described multiple aluminums foam board is carried out decontamination, cleaning by degreasing and drying and processing, and the multiple aluminums foam boards obtained are carried out surface finish roughening treatment, remove surface oxide layer.
Utilize the different abrasive band of 60-100 object, surface finish roughening treatment is carried out to described multiple aluminums foam board.
Further, described step D) comprising:
D1), after described multiple aluminums foam board of surface finish alligatoring being cleaned, in aluminum brazing flux, carry out immersion treatment and dry;
D2), after utilizing ultrasonic wave to be cleaned by described aluminium alloy lower house, carry out the process of surface spraying aluminum brazing flux or in aluminum brazing flux, carry out immersion treatment and dry;
D3) soldering oven temperature is adjusted between 450 ~ 650 DEG C, under gas shield, make aluminium alloy lower house and aluminums foam board carry out sealed welding in soldering oven, form the aluminium alloy lower house assembly with multiple aluminum foam cavity.
Further, described step e) comprising:
E1) multiple process duct is inserted respectively in multiple fabrication holes of described aluminium alloy upper shell;
E2) argon arc welding is utilized described process duct and described aluminium alloy upper shell to be welded together;
E3) the aluminium alloy upper shell being provided with multiple process duct to be fastened on described aluminium alloy lower house assembly and to utilize friction stir welding, in the described supporting construction that the described welding groove of described aluminium alloy upper shell and described welding side are welded to described aluminium alloy lower house assembly and described sealed step.
Further, described step e) also comprise:
E4) in the described step e 3 of enforcement) after, utilize process duct to vacuumize multiple aluminum foam cavity, note working medium process.
E5) in the described step e 4 of enforcement) after, utilize process duct described in argon arc welding soldering and sealing.
Compared with prior art, beneficial effect of the present invention is: the present invention, by forming multiple completely independent sealed cavity in temperature-uniforming plate inside, achieves reliability redundancy, and can meet the heat transfer requirement of multiple thermal source.
Accompanying drawing explanation
Fig. 1 is traditional phase transformation temperature-uniforming plate fundamental diagram that prior art provides;
Fig. 2 is the aluminium alloy lower house structure chart that the embodiment of the present invention provides;
Fig. 3 is the aluminium alloy upper shell structure chart that the embodiment of the present invention provides;
Fig. 4 is the aluminums foam board structure chart cut out that the embodiment of the present invention provides;
Fig. 5 is the aluminums foam board structure chart after the compacting that provides of the embodiment of the present invention;
Fig. 6 is the aluminium alloy lower house assembly assumption diagram that the embodiment of the present invention provides;
Fig. 7 is the Al-alloy casing Welding Structure figure that the embodiment of the present invention provides;
Fig. 8 is the application schematic diagram of the multi-cavity phase change temperature-equalization plate that the embodiment of the present invention provides.
Description of reference numerals: 1-housing; 2-capillary structure; 3-steam channel; 4-fluid passage; 51a-first cavity; 51b-second cavity; 51c-the 3rd cavity; 51d-the 4th cavity; 52a-first aluminums foam board; 52b-second aluminums foam board; 52c-the 3rd aluminums foam board; 52d-the 4th aluminums foam board; 53a-first aluminum foam cavity; 53b-second aluminum foam cavity; 53c-the 3rd aluminum foam cavity; 53d-the 4th aluminum foam cavity; 6-sidewall; 7-supporting construction; 8-sealed step; 9-welds side; 10-welds groove; 11-fabrication hole; 12-side seam groove; 13a-first thermal source; 13-Secondary Heat Source; 13c-the 3rd thermal source.
Detailed description of the invention
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, should be appreciated that following illustrated preferred embodiment is only for instruction and explanation of the present invention, is not intended to limit the present invention.
As shown in Figures 2 to 7, the method for manufacture multi-cavity phase change temperature-equalization plate of the present invention comprises the steps:
A) aluminium alloy plate is processed into the aluminium alloy lower house with multiple cavity.Described aluminium alloy lower house has the sidewall 6 processing sealed step 8, and is used for being formed the supporting construction 7 of multiple cavity 51a-51d.
B) the aluminium alloy upper shell matched with described aluminium alloy lower house is made.Described aluminium alloy upper shell have match with described sealed step 8 and described supporting construction 7 respectively weld side 9 and weld groove 10, and multiple fabrication holes 11 corresponding with described multiple cavity 51a-51d.
C) the multiple aluminums foam board 52a-52d matched with described multiple cavity 51a-51d are made.Specifically, first cut out the multiple aluminums foam board 52a-52d matched with described multiple cavity 51a-51d, then the described multiple aluminums foam board 52a-52d cut out are carried out mold pressing process.After enforcement mold pressing process, utilize ultrasonic wave, described multiple aluminums foam board 52a-52d is carried out decontamination, cleaning by degreasing and drying and processing, and utilize the different abrasive band of 60-100 object, the multiple aluminums foam board 52a-52d obtained are carried out surface finish roughening treatment, removes surface oxide layer.
D) described multiple aluminums foam board 52a-52d is respectively installed in aluminium alloy lower house in corresponding multiple cavity 51a-51d, forms the aluminium alloy lower house assembly with multiple aluminum foam cavity 53a-53d.Specifically; first in aluminum brazing flux, carry out immersion treatment after being cleaned by described multiple aluminums foam board 52a-52d of surface finish alligatoring and dry; carry out the process of surface spraying aluminum brazing flux after utilizing ultrasonic wave to be cleaned by described aluminium alloy lower house or in aluminum brazing flux, carry out immersion treatment and dry; then soldering oven temperature is adjusted between 450 ~ 650 DEG C; under gas shield; make aluminium alloy lower house and aluminums foam board 52a-52d carry out sealed welding in soldering oven, form the aluminium alloy lower house assembly with multiple aluminum foam cavity 53a-53d.
E) described aluminium alloy upper shell is fastened on described aluminium alloy lower house assembly, and carry out encapsulation process.Specifically, first multiple process duct is inserted respectively in multiple fabrication holes 11 of described aluminium alloy upper shell, argon arc welding is utilized described process duct and described aluminium alloy upper shell to be welded together, then the aluminium alloy upper shell being provided with multiple process duct is fastened on described aluminium alloy lower house assembly, and utilize friction stir welding, in the described supporting construction 7 that the described welding groove 10 of described aluminium alloy upper shell and described welding side 9 are welded to described aluminium alloy lower house assembly and described sealed step 8, finally, process duct is utilized to vacuumize multiple aluminum foam cavity 53a-53d, the process of note working medium, and utilize process duct described in argon arc welding soldering and sealing.
Below for four cavitys, in conjunction with such as Fig. 2 to Fig. 7, above-mentioned manufacture method is described in detail.
1, the making of multi-cavity phase change temperature-equalization plate aluminum enclosure
By aluminium extrusion process or utilize CNC process technology, the aluminium alloy lower house of multi-cavity phase change temperature-equalization plate is as shown in Figure 2 produced with aluminium alloy plate, and with supporting construction 7 wherein, described aluminium alloy lower house is divided into four cavitys, form the aluminium alloy lower house with the first cavity 51a, the second cavity 51b, the 3rd cavity 51c and the 4th cavity 51d.Wherein, described supporting construction 7 not only can make phase transformation equalizing plate structure strengthen, and, be also the step of four cavity 51a-51d welded seals.The surrounding sidewall 6 of described aluminium alloy lower house processes sealed step 8, and described sealed step 8 and described supporting construction 7 are with high.
According to the size of the sealed step 8 of the aluminium alloy lower house of multi-cavity phase change temperature-equalization plate, aluminium alloy plate is cut out aluminium alloy upper shell as shown in Figure 3, its Surface Machining has welding groove 10 and the welding side 9 with inclination angle.That is, the described aluminium alloy upper shell produced will match with described aluminium alloy lower house, have match with described sealed step 8 and described supporting construction 7 respectively weld side 9 and weld groove 10.Further, have four fabrication holes 11 in four bights of aluminium alloy upper shell, the process duct that described fabrication hole 11 is vented for being welded as each cavity and filling working medium.
2. foamed aluminium is shaping:
According to the design requirement of different product, select the foamed aluminium (80 ~ 120 order) of different mesh, and according to the hot biography demand of product, different mould of cutting is utilized to cut out the first aluminums foam board 52a (1# cavity cystosepiment), the second aluminums foam board 52b (2# cavity cystosepiment), the 3rd aluminums foam board 52c (3# cavity cystosepiment), the 4th aluminums foam board 52d (4# cavity cystosepiment) as shown in Figure 4 respectively, to coordinate the size of each cavity 51a-51d of multi-cavity phase change temperature-equalization plate aluminium alloy lower house.
To cutting the described aluminums foam board 52a-52d that obtains, utilize pressing mold respectively processing and fabricating go out the aluminum foam cavity geometry of the multiple cavity 51a-51d of correspondence as Fig. 5, utilize ultrasonic wave to carry out decontamination, cleaning by degreasing afterwards, post-drying.
3. foamed aluminium surface coarsening process
Utilize the different abrasive band of 60 ~ 100 orders, aluminums foam board 52a-52d and Al-alloy casing contact surface are carried out polishing roughening treatment, to increase the contact area on aluminums foam board 52a-52d surface and Al-alloy casing, and aluminums foam board 52a-52d surface oxide layer can be removed.
4. aluminums foam board pretreatment:
The aluminums foam board 52a-52d of roughening treatment is cleaned, afterwards aluminum foam 52a-52d plate is immersed in aluminum brazing flux liquid, and make aluminums foam board 52a-52d not stop swing in aluminum brazing flux, and vertical tremor, to make aluminums foam board 52a-52d surface can fully be soaked in aluminum brazing flux liquid, take out and dry in drying tunnel.
5. Al-alloy casing pretreatment
Aluminium alloy lower house is carried out Ultrasonic Cleaning, and use aluminum brazing flux to carry out surface of shell spray or immersion treatment afterwards, rear taking-up is dried in drying tunnel.
6. aluminums foam board and aluminium alloy lower house are assembled
Cleaning, the aluminums foam board 52a-52d of having dried and aluminium alloy lower house are fitted together, as shown in Figure 6, and (keeps certain pressure, 10kg/cm by sealed for soldering core 2) in corresponding aluminum foam cavity 53a-53d, and protect fabrication hole 11.
7. aluminium alloy lower house and aluminums foam board soldering
Adjustment soldering oven temperature (between 450 ~ 650 DEG C); under the gas shield of nitrogen (or other protective gas); aluminium soldering workpiece is made to carry out soldering in gas protecting soldering furnace, together with disposable to aluminium alloy lower house and aluminums foam board seal welding.Then under gas shield condition, be cooled to 45 degree below and take out workpiece.
8. annex assembling
Process duct (vacuum tube and filling tube) and aluminium alloy upper shell four fabrication holes 11 are fitted together.The fit clearance controlled well in an assembling process between housing and case weld gap, described fit clearance is generally less than 0.08mm.Then, argon arc welding is utilized process duct and aluminium alloy upper shell to be welded together.
9, housing seal welding
Adopt friction stir welding (Friction Stir Welding, be called for short FSW) technology, in welding process, soldering tip rotates by welding groove 10 as described in Figure 7 and side seam groove 12 curve and stretches in the seam of workpiece, frictional heat between rotary horn and workpiece, makes the aluminum alloy materials generation intense plastic strain before soldering tip, then along with the movement of soldering tip, the flow of material of superplasticity's distortion to the behind of soldering tip, by side seam and groove gap seal welding.Thus make each aluminum foam cavity reach completely independent sealed effect.
10, vacuumize, note working medium
The aluminum hull cavity of each seal welding is vacuumized (< 1.3X10 by the process duct of each independent aluminum foam cavity -2~ 5.0X10 -3pa), and according to product design demand, the working medium (141b, acetone, ethylene glycol etc.) of different amount is injected at each aluminum foam cavity.
11, process duct sealing.
After injecting the working medium of respective amount, utilize argon arc welding, the process duct of each aluminum foam cavity of soldering and sealing.
12, welded case sealing detection:
Utilize helium Mass Spectrometer Method, sealing detection is carried out to each sealing aluminium alloy housing, air pressure detection (5 ~ 15kgf/cm2) is carried out according to different product structural design and different demand, or utilize helium mass spectrum carry out sealing detection (vary in size according to product design requirement, cavity volume, working material, the difference of service life etc., its micro-leakage controls at 3.0X10 -10~ 1.0X10 -11pa.m 3/ S).
13, Performance Detection
The aluminium temperature-uniforming plate made is carried out the performance tests such as heat output, uniform temperature, thermal resistance.
Fig. 8 shows the application schematic diagram of the multi-cavity phase change temperature-equalization plate that the embodiment of the present invention provides, as shown in Figure 8, in a power module, there are three pyrotoxins simultaneously, the first thermal source 13a, Secondary Heat Source 13b, the 3rd thermal source 13c respectively, described three thermals source are positioned at the below of multi-cavity phase transformation temperature-uniforming plate, and with temperature-uniforming plate plane close contact.Colling end is transferred to by multi-cavity phase transformation temperature-uniforming plate in order to what can ensure that heat that described three heat source module produce can be safe and reliable, have employed Redundancy Design, namely each thermal source contacts with two independent sealed temperature-uniforming plate cavitys simultaneously, as shown in Figure 8, described first thermal source 13a is positioned at below the first aluminum foam cavity 53a and the second aluminum foam cavity 53b, described Secondary Heat Source 13b is positioned at below the second aluminum foam cavity 53b and the 3rd aluminum foam cavity 53c, described 3rd thermal source 13c is positioned at below the 3rd aluminum foam cavity 53c and the 4th aluminum foam cavity 53d, namely the heat that the first thermal source 13a produces can be transferred to colling end by the working medium (working solution) in the first aluminum foam cavity 53a and second aluminum foam cavity 53b two independent sealed chambeies.Equally, the heat that Secondary Heat Source 13b produces can be transferred to colling end by the working solution in the second aluminum foam cavity 53b and the 3rd aluminum foam cavity 53c two independent sealed chambeies; The heat that described 3rd thermal source 13c produces can be transferred to colling end by the working solution in the 3rd aluminum foam cavity 53c and the 4th aluminum foam cavity 53d two independent sealed chambeies.
Its reliability shows, when one of them independent sealed chamber, such as the first aluminum foam cavity 53a, when there is leakage or other damage, the heat that first thermal source 13a produces still can be taken away by the working medium in the second aluminum foam cavity 53b, thus ensure that the first thermal source 14a can normal use, enhance reliability and the security of power module.
In sum, the present invention has following technique effect:
1. can meet multi-heat source heat transfer requirement simultaneously;
2. multiple aluminum foam cavity can be utilized to reach the design requirement of redundant reliability;
3. multi-cavity phase change temperature-equalization plate has better structural strength;
4. manufacture craft is simple, and relative copper samming cost can significantly reduce;
5. effectively can reduce heatsink weight.
Although above to invention has been detailed description, the present invention is not limited thereto, those skilled in the art of the present technique can carry out various amendment according to principle of the present invention.Therefore, all amendments done according to the principle of the invention, all should be understood to fall into protection scope of the present invention.

Claims (8)

1. manufacture a method for multi-cavity phase change temperature-equalization plate, it is characterized in that, comprise the following steps:
A) aluminium alloy plate is processed into the aluminium alloy lower house with multiple cavity;
B) the aluminium alloy upper shell matched with described aluminium alloy lower house is made;
C) the multiple aluminums foam boards matched with described multiple cavity are made;
D) described multiple aluminums foam board is respectively installed in aluminium alloy lower house in corresponding multiple cavity, forms the aluminium alloy lower house assembly with multiple aluminum foam cavity;
E) described aluminium alloy upper shell is fastened on described aluminium alloy lower house assembly, and carry out encapsulation process;
Wherein, in described steps A) in, described aluminium alloy lower house has the sidewall processing sealed step, and is used for being formed the supporting construction of multiple cavity;
Wherein, at described step B) in, described aluminium alloy upper shell have match with described sealed step and described supporting construction respectively weld side and weld groove and the multiple fabrication holes corresponding with described multiple cavity.
2. method according to claim 1, is characterized in that, described step C) comprising:
C1) the multiple aluminums foam boards matched with described multiple cavity are cut out;
C2) the described multiple aluminums foam board cut out is carried out mold pressing process.
3. method according to claim 2, is characterized in that, described step C) also comprise:
C3) at the described step C2 of enforcement) after, utilize ultrasonic wave, described multiple aluminums foam board is carried out decontamination, cleaning by degreasing and drying and processing, and the multiple aluminums foam boards obtained are carried out surface finish roughening treatment, remove surface oxide layer.
4. method according to claim 3, is characterized in that, utilizes the different abrasive band of 60-100 object, carries out surface finish roughening treatment to described multiple aluminums foam board.
5. the method according to claim 3 or 4, is characterized in that, described step D) comprising:
D1), after described multiple aluminums foam board of surface finish alligatoring being cleaned, in aluminum brazing flux, carry out immersion treatment and dry;
D2), after utilizing ultrasonic wave to be cleaned by described aluminium alloy lower house, carry out the process of surface spraying aluminum brazing flux or in aluminum brazing flux, carry out immersion treatment and dry;
D3) soldering oven temperature is adjusted between 450 ~ 650 DEG C, under gas shield, make aluminium alloy lower house and aluminums foam board carry out sealed welding in soldering oven, form the aluminium alloy lower house assembly with multiple aluminum foam cavity.
6. method according to claim 5, is characterized in that, described step e) comprising:
E1) multiple process duct is inserted respectively in multiple fabrication holes of described aluminium alloy upper shell;
E2) argon arc welding is utilized described process duct and described aluminium alloy upper shell to be welded together;
E3) the aluminium alloy upper shell being provided with multiple process duct to be fastened on described aluminium alloy lower house assembly and to utilize friction stir welding, in the described supporting construction that the described welding groove of described aluminium alloy upper shell and described welding side are welded to described aluminium alloy lower house assembly and described sealed step.
7. method according to claim 6, described step e) also comprise:
E4) in the described step e 3 of enforcement) after, utilize process duct to vacuumize multiple aluminum foam cavity, note working medium process.
8. method according to claim 7, described step e) also comprise:
E5) in the described step e 4 of enforcement) after, utilize process duct described in argon arc welding soldering and sealing.
CN201210008326.XA 2012-01-12 2012-01-12 Method for producing multi-cavity phase change temperature-equalization plate Active CN103203606B (en)

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CN106409792A (en) * 2016-10-18 2017-02-15 武汉征原电气有限公司 Water cooling plate radiator and the preparation technology for the same
CN109618532B (en) * 2018-12-18 2020-08-28 山东超越数控电子股份有限公司 Multi-channel heat dissipation and temperature equalization device
CN112719821B (en) * 2020-12-16 2022-12-16 北京有色金属与稀土应用研究所 Ultrathin vacuum cavity vapor chamber composite material and sealing forming method thereof

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