A kind of tabular heat pipe and processing technology thereof
Technical field
The present invention relates to hot pipe technique, particularly a kind of tabular heat pipe and processing technology thereof that is used for phase-change heat-exchange.
Background technology
Compare with the heat exchange mode of free convection and forced convertion; Because the mode heat transfer efficiency of phase-change heat-exchange is high; Utilize the heat exchanger of phase-change heat-exchange technology in industry, to obtain using widely, in this type of phase-change heat-exchanger technology, most typically will belong to the heat exchange of heat pipe technology; The main heat transfer type of heat pipe has the advantages that for evaporation and condensation heat-transfer capability is big, temperature control capability is strong, heat transfer efficiency is high.Though wherein oscillation mode heat pipe heat transfer efficiency is higher, this kind heat transfer element needs the starting of oscillation temperature difference; The extraction of common its manufacture craft of capillary wick heat pipe such as the preparation of capillary wick material, vacuum, the encapsulation of working medium and maintenance process are very complicated, make its application receive very big restriction.
Summary of the invention
To defective and the deficiency that existing hot pipe technique exists, the object of the present invention is to provide a kind of structural strength height, make and safeguard simple novel plate shaped heat pipe applicable to heat exchange of heat pipe.
The present invention also provides a kind of processing technology of said tabular heat pipe.
Technical scheme of the present invention is following:
A kind of tabular heat pipe; Comprise tabular heat pipe framework; It is characterized in that: have the microporous pipe group structure that microporous pipe in groups constitutes in the said tabular heat pipe framework, interconnect between said each microporous pipe sidewall, with the intensity and the augmentation of heat transfer performance of mutual each microporous pipe of reinforcement; Be filled with the working medium of phase-change heat-exchange effect in the said microporous pipe, the sealed at both ends of said tabular heat pipe and at least one termination have the Sealing strap of the gradual change contraction that is formed by cold welding.
At least one longitudinal section of said each microporous pipe is punctured into a bit along the gradual change of microporous pipe pipe range direction in the outer side edges at this Sealing strap place, and said outer side edges is two arc limits of relative indent.
At least one longitudinal section of said each microporous pipe is punctured into a bit along the gradual change of microporous pipe pipe range direction at the inner side edge at this Sealing strap place, and said inner side edge is two arc limits of relative indent.
End has the reinforcing weld bond that curls that is formed by soldering or ratio-frequency welding to tabular heat pipe at the Sealing strap place, and/or the outer setting of said tabular heat pipe end at the Sealing strap place has protective sleeve.
Be connected with reinforcement between said each microporous pipe.
The length-width ratio of channel cross-section that microporous pipe is set is between
is to 1.5, and the minimum tube wall of said tabular heat pipe and the ratio of each microporous pipe equivalent diameter are all more than or equal to 0.2.
When the gross thickness of tabular heat pipe during smaller or equal to 3mm, the extended length that said Sealing strap gradual change is shunk and the ratio of tabular heat pipe gross thickness are between 0.75 to 1.5; When the gross thickness of tabular heat pipe between the 3mm to 5mm the time, the extended length that said Sealing strap gradual change is shunk and the ratio of tabular heat pipe gross thickness are between 0.6 to 1.5; When the gross thickness of tabular heat pipe during greater than 5mm, the extended length that said Sealing strap gradual change is shunk and the ratio of tabular heat pipe gross thickness are between 0.5 to 1.5.
Said each microporous pipe is independent heat pipe structure; Or said micropore nest of tubes one end is open in framework, other end sealing, and each microporous pipe all can form semi-independent heat pipe structure.
The evaporating surface of said tabular heat pipe links to each other with the heating face of electronic device, and other part of tabular heat pipe is a cryosurface; Or an end of said tabular heat pipe is positioned among the thermal source, and the heat absorption evaporation, and the other end is arranged in heat exchanging water pipe's condensation heat release; Or said tabular heat pipe is as the heat collector of solar water heater, and each micropore nest of tubes one end absorbs the evaporation of solar radiation energy as heat pipe, the other end in heat storage water tank the condensation heat release with preparation hot water; Or the evaporating surface of said tabular heat pipe contacts with the backboard of solar energy power generating cell panel, with heat and the evaporation that absorbs the solar energy power generating cell panel, the cryosurface of tabular heat pipe in heat exchanger the condensation heat release with preparation hot water.
A kind of processing technology of aforesaid tabular heat pipe is characterized in that: said micropore nest of tubes is structure as a whole for adopting extruding or welding or sintering or being stamped to form, or said micropore nest of tubes is processed for the screen net structure thing; The end sealer technology that the end sealer technology of said tabular heat pipe comprises tabular heat pipe before the can working medium and can working medium is another termination sealing process of tabular heat pipe afterwards; Another termination sealing process of tabular heat pipe adopts cold welding technique after the said can working medium, and said cold welding technique makes it distortion for this termination of pushing tabular heat pipe through the edge of a knife and seals and cut off.
After an end sealer technology of tabular heat pipe also adopts cold welding technique or this termination of tabular heat pipe flattened, curls before the said can working medium, adopt soldering or ratio-frequency welding to seal and reinforce or seal at this termination point casing upper bush.
After accomplishing, the end sealer technology of said tabular heat pipe again the two ends of tabular heat pipe is installed protective sleeve.
Technique effect of the present invention:
The present invention is through being provided with interconnective micropore nest of tubes in flat framework; In the plate frame after application of vacuum filling liquid working medium; Liquid working substance is in the pipeline of each microporous pipe; Naturally form the heat pipe effect, heat pipe can use separately, also can the cryosurface of heat pipe partly be provided with outer fin and fan.Mode with free convection or forced convertion is passed to heat in the atmosphere.Tabular heat pipe of the present invention not only has the high efficiency and the inner heat pipe high efficient heat exchanging characteristic of the heat absorption of full platen surface, and has structural strength height, ultra-thin, non-maintaining advantage.The sealed at both ends of tabular heat pipe and the Sealing strap that at least one termination has the gradual change contraction that is formed by cold welding are set; Be through using cold welding technique to prepare the unique texture that this tabular heat pipe forms; Pack in the sleeve again with the capping of heat pipe termination or with heat pipe sleeve-port is welded capping or is processed as one the termination fusion is integral braze-welded and traditional end sealer technology typically uses hot welding; Technology is complicacy very, and the present invention adopts unique end sealer cold welding technique disposable closure to encapsulate to form the tabular heat pipe of unique Sealing strap with gradual change contraction.
Can the framework internal cavity be separated into some a large amount of parallel duct (being the microporous pipe pipeline of parallel arrangement) structures through interior extruding; Through filling liquid working medium after the application of vacuum; Thereby make each duct in the inner chamber all form heat pipe structure, this heat pipe structure has then possessed the high characteristic of heat pipe-type heat transfer efficiency, eliminated general heat pipe and oscillating heat pipe and the face contact area that is cooled little; The characteristics that equivalent thermal resistance is big have overcome the shortcoming that oscillating heat pipe needs the starting of oscillation temperature difference simultaneously.Have simple in structure, ultra-thin, reliable operation, with low cost, non-maintaining, characteristics that radiating efficiency is high, can be used for replacing oscillating heat pipe and general heat pipe.
Through seal and the oxidation resistance that reinforcing weld bond and protective sleeve can strengthen the end sealer of the tabular heat pipe of the present invention is set.
Each microporous pipe directly interconnects, and plays the effect of reinforcement, can improve the intensity of micropore pipeline, makes tabular heat pipe of the present invention have better withstand voltage properties, and therefore, safe and reliable property is good.
Adopt plate armature of the present invention, can reduce the sheet metal thickness of frame structure, reduce the material consumption of framework, reduce the material cost of product, have energy-saving and cost-reducing advantage.
Gross thickness through tabular heat pipe is in different spans; Set the span of ratio between the extended length that the Sealing strap gradual change of this gross thickness and tabular heat pipe shrinks; The pressure that makes microporous pipe inside bear can be greater than 2.0MPa; To satisfy the pressure that different liquids working medium can be born in the microporous pipe under various operating temperatures, adapt to the need of work of heat pipe under various situation.
The integrative-structure of micropore nest of tubes for adopting extruding or welding or sintering or being stamped to form in the processing technology of the tabular heat pipe that the present invention relates to; Especially extruding or punch forming; Technology is simple; When having saved existing heat pipe and having made such as technologies such as capillary wick material preparation and maintenance, again because be global formation, so need not to use soldering processes in soldering oven through the integral braze-welded structure that is processed as one.The tube wall of the aluminothermy pipe pipe material of GB (GB9082.1-88) defined should be greater than 1.0mm,, and the application's tabular heat pipe is owing to support between each microporous pipe in the micropore nest of tubes each other; Can strengthen the intensity of each microporous pipe each other; So the tube wall of tabular heat pipe can be reduced to about 0.2-0.4mm, for the termination sealed package technology of heat pipe, if adopt capping encapsulation of the prior art with light wall pipe wall like this; Be easy to reveal; Influence airtight performance, if adopt the encapsulation of termination fusion soldering processes, rupture again easily in the termination.The application's end sealer adopts cold welding technique; Can make it distortion through the termination that the edge of a knife pushes tabular heat pipe and seal and cut off, make the termination form the Sealing strap that gradual change is shunk, can disposable closed encapsulation; Technology is simple; Good airproof performance can not revealed, and has strengthened reliability and security performance.
Description of drawings
Shown in Figure 1 is a kind of embodiment-solar thermal collector structural representation of the tabular heat pipe of the present invention;
Shown in Figure 2 is a kind of structural representation of the tabular inside heat pipe micropore of the present invention nest of tubes;
Shown in Figure 3 is the vertical section structure sketch map of the tabular heat pipe of the present invention;
Shown in Figure 4 is the another kind of structural representation of the tabular inside heat pipe micropore of the present invention nest of tubes;
Shown in Figure 5 is the another kind of structural representation of the tabular inside heat pipe micropore of the present invention nest of tubes;
Shown in Figure 6 is the process chart of the tabular heat pipe end sealer of the tabular heat pipe processing technology of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Be illustrated in figure 1 as the tabular heat pipe of the present invention at structural representation as solar thermal collector.
Solar thermal collector comprises absorber plate 7, heat exchanger 2 and import and export thereof---the water pipe 3 and water pipe 4 that tabular heat pipe constitutes in the present embodiment; Wherein the endotherm section of absorber plate 7 (being the evaporating surface of tabular heat pipe) is exposed on the sunny side is provided with to absorb sunray; Heat release section is arranged in the heat exchanger 2; Heat release section is the condensation heat release in heat exchanger 2, and the water storage in the heat exchanger 2 is heated.
The side that endotherm section faces south is the extinction face; Its outer surface can be provided with the heat absorbing coating of ability efficient absorption solar energy, to improve heat absorption efficiency as far as possible, is provided with the microporous pipe group structure in the tabular heat pipe framework of absorber plate 7; Inside, framework duct is vacuum structure; And be filled with refrigeration working medium, and working medium is filled in an end of each microporous pipe respectively, and these microporous pipe are the corresponding heat pipe that becomes respectively just.
The operation principle of present embodiment: the endotherm section of absorber plate 7 absorbs solar radiant heat; Working medium heat absorption evaporation in the heat pipe; High-temperature vapour carries out the condensation heat release through the pipeline entering heat release section of each microporous pipe respectively; With heat exchanger 2 in the water heat-shift after be condensed into flow of liquid resorption hot plate 7 bottoms, liquid heat absorption is evaporation again ..., so go round and begin again; Just can the radiations heat energy that absorber plate 7 is absorbed be passed to the water in the heat exchanger 2 continuously, thereby with reaching the purpose of utilizing solar radiation heat.
Shown in Figure 2 is a kind of embodiment of the microporous pipe group structure of the tabular heat pipe of the present invention.Tabular heat pipe among this embodiment; Comprise tabular
heat pipe framework 1; Have the micropore nest of
tubes 5 that
microporous pipe 6 in groups constitutes in the tabular
heat pipe framework 1, interconnect between each
microporous pipe 6, with the intensity of each
microporous pipe 6 of mutual reinforcement; Be filled with the working medium of phase-change heat-exchange effect in the
microporous pipe 6, in tabular
heat pipe framework 1, formed the micro heat pipe array.Wherein, The sealed at both ends of tabular heat pipe and two ends all have the Sealing strap of the gradual change contraction that is formed by cold welding; The two ends of each
microporous pipe 6 is all sealed and at least one longitudinal section of each
microporous pipe 6 all is punctured into a bit along
microporous pipe 6 pipe range direction gradual changes on the outer side edges and the interior survey limit at this Sealing strap place; This outer side edges and interior survey limit are two arc limits of relative indent; The vertical section structure sketch map of the tabular heat pipe of the present invention as shown in Figure 3, tabular heat pipe have by soldering or ratio-frequency welding or other welding method at Sealing strap place end reinforces the curling reinforcing
weld bond 8 that forms, and the outer setting of this reinforcing
weld bond 8 has protective sleeve.Micropore nest of
tubes 5 adopts extrusion forming process processing; The cross section of each
microporous pipe 6 is an approximate ellipsoidal; Each
microporous pipe 6 sides adjacent is the plane and interconnects; Micropore size or hydraulic diameter are between 0.1mm-3.5mm; The length-width ratio of channel cross-section that
microporous pipe 6 preferably is set is between
is to 1.5, and the minimum tube wall of tabular heat pipe and the ratio of each microporous pipe equivalent diameter are all more than or equal to 0.2.Such microporous pipe group structure, each microporous pipe are strengthened intensity each other each other, improve whole withstand voltage properties, and therefore, safe and reliable property is higher.
Suppose that the extended length that the Sealing strap gradual change is shunk and the ratio of tabular heat pipe gross thickness are δ, when the gross thickness of tabular heat pipe during smaller or equal to 3mm, 0.75≤δ≤1.5; When the gross thickness of tabular heat pipe between the 3mm to 5mm the time, 0.6≤δ≤1.5; When the gross thickness of tabular heat pipe during greater than 5mm, 0.5≤δ≤1.5.The relation of the extended length of shrinking for the gross thickness of tabular heat pipe and Sealing strap gradual change is set; Make sealing part can possess enough intensity; Thereby the pressure that microporous pipe inside is born can be greater than 2.0MPa; To satisfy the pressure that different liquids working medium can be born in the microporous pipe under various operating temperatures, adapt to the need of work of heat pipe under various situation.For example, when the gross thickness of tabular heat pipe was 3mm, the extended length that Sealing strap gradual change contraction can be set was 2.5mm or 3mm etc., and when the gross thickness of tabular heat pipe was 4mm, the extended length that Sealing strap gradual change contraction can be set was 2.8mm or 3mm etc.
Each microporous pipe 6 can form independent heat pipe structure or semi-independent heat pipe structure.For example; Each microporous pipe 6 is independent heat pipe structure when each microporous pipe 6 two ends is all sealed; Constitute the micro heat pipe array, be not communicated with between each microporous pipe 6, all can work independently; Help heat pipe whole reliability and security maintenance so more, just in case a certain microporous pipe is damaged such as the work that also can not influence other microporous pipe after the gas leakage.Open in framework when each microporous pipe 6 one end, promptly microporous pipe 6 communicates with each other, and open mode can be hollow sleeve on this termination point casing of tabular heat pipe; Make this end of tabular heat pipe seal, and each microporous pipe 6 communicates with each other at this end, promptly each microporous pipe 6 is semi-independent heat pipe structure; Semi-independent heat pipe structure integral body has constituted microporous pipe array heat pipe, need not to seal the termination of each microporous pipe because microporous pipe 6 terminations are open, thereby has reduced heat pipe to the vacuum requirement; But this structure needs welding procedure when making; As use welding procedures such as argon arc welding, ratio-frequency welding or soldering to make, and each microporous pipe is communicated with in the end between each microporous pipe owing to be semi-independent heat pipe each other; Real is single heat pipe structure; Will influence the work of other microporous pipe in case a certain microporous pipe is damaged, cause the whole inefficacy of heat pipe, so reliability is understood some reduction.
Wherein, the two ends of tabular heat pipe all need seal, and the end sealer technology of this tabular heat pipe comprises another termination sealing process of tabular heat pipe after an end sealer technology and the filling liquid working medium of tabular heat pipe before the filling liquid working medium.An end sealer technology of tabular heat pipe can have three kinds before the filling liquid working medium; A kind of is to adopt the cold welding technique sealed package; The process chart of the tabular heat pipe end sealer of the tabular heat pipe processing technology of the present invention as shown in Figure 6; This cold welding technique in tabular heat pipe termination upper and lower place cutter 9 respectively, the termination that the edge of a knife through cutter 9 pushes tabular heat pipe makes it distortion and seals and cut off; Second method is after being flattened, curl in this termination of tabular heat pipe, to adopt soldering or ratio-frequency welding to seal reinforcing; The third method is to seal at this termination point casing upper bush.Another termination sealing process of tabular heat pipe adopts cold welding technique after the filling liquid working medium, and the cold welding technique that this cold welding technique and filling liquid working medium are mentioned in the first method of an end sealer technology of tabular heat pipe before is identical.Adopt the cold welding technique sealed package again after also can be earlier aluminium wire being inserted into the mouth of pipe of microporous pipe 6.Can also the two ends of tabular heat pipe be installed protective sleeve after the end sealer technology of tabular heat pipe is accomplished, realize the reinforcing weldering of the end sealer of tabular heat pipe like sleeve, with the sealing and the oxidation resistance of further its port of enhancing.
Shown in Figure 4 is the another kind of embodiment of the microporous pipe group structure of the tabular heat pipe of the present invention.In the present embodiment, micropore nest of tubes 5 adopts the processing of particle sintering process, and the cross section of each microporous pipe 6 is circular, interconnects between each microporous pipe 6; Shown in Figure 5 is the another kind of embodiment of the microporous pipe group structure of the tabular heat pipe of the present invention.In the present embodiment, micropore nest of tubes 5 adopts screen net structure, and the cross section of each microporous pipe 6 is a rectangle, interconnects reinforcement between each microporous pipe 6.
Certainly; Among the above each embodiment; The cross section of microporous pipe 6 need not be defined as illustrated shape, and under the situation that processing conditions allows, its cross section can not form the arbitrary shape that stress is concentrated for other polygonal (like triangle and square etc.) or other; Wherein, polygonal drift angle place should be the level and smooth fillet with certain curvature.
Tabular heat pipe framework of the present invention and micropore nest of tubes thereof are that metal material is processed.
This tabular heat pipe that has a plurality of fine conduits; Tabular heat pipe can utilize gravity and REFRIGERATION SYSTEM DRIVEN BY CAPILLARY FORCE to make every effort to promote the steam of evaporator section is moved to condensation segment faster; Simultaneously also can impel condensate liquid to turn back to evaporator section faster evaporates once more; Circulation successively, clearly, the absorber plate structure that this tabular heat pipe constitutes has than the existing bigger collecting efficiency of common thermal-arrest plate.
Novel plate shaped heat pipe involved in the present invention can be applicable among solar thermal collector, electronic radiation device and the heat exchange of heat pipe.
When tabular heat pipe of the present invention is used for dissipation from electronic devices; The evaporating surface of tabular heat pipe and the heating face of electronic device are joined; The heat that tabular heat pipe will absorb electronic device automatically and distributed, the remainder of tabular heat pipe be as condensation segment, thereby reach the purpose of high efficiency and heat radiation.
When tabular heat pipe of the present invention was used for heat exchange of heat pipe, the two ends of tabular heat pipe laid respectively in the thermal source and refrigerant that needs heat exchange, and tabular heat pipe just can carry out high efficient heat exchanging through the evaporative condenser of self.
When tabular heat pipe of the present invention is used for heat radiation or the cogeneration system of solar energy power generating cell panel; The evaporating surface of tabular heat pipe contacts with the backboard of solar energy power generating cell panel; As through closely pasting mutually or closely bonding, also evaporate with the heat that absorbs the solar energy power generating cell panel; The cryosurface of tabular heat pipe in heat exchanger the condensation heat release with the preparation hot water.The above is merely preferred implementation of the present invention.For a person skilled in the art, can also make a lot of modification and improvement, but these modification all will fall into protection scope of the present invention with improving according to essence of the present invention.