Summary of the invention
The problem that the present invention solves is that radiating tube adopts single capillary structure, and after radiating tube was flattened, radiating tube maximal heat transfer amount can decline to a great extent and thermal resistance can increase; Radiating tube is prone to form seeping phenomenon in adiabatic section and condensation segment.
For addressing the above problem; The invention provides a kind of flat radiating tube, comprise the tube chamber of closed at both ends and surround the tube wall of said tube chamber vertically, said tube chamber and tube wall are defined as evaporator section, adiabatic section and condensation segment vertically successively; It is characterized in that, be provided with in the said tube chamber:
Master capillary structure contacts with the tube wall of said evaporator section, and extends to the adiabatic section of tube chamber;
The auxiliary capillary structure contacts with the tube wall of said adiabatic section and condensation segment, and in the adiabatic section of tube chamber, the said auxiliary capillary structure of part is covered by said master capillary structure,
Be filled with working media in the tube chamber that said master capillary structure and auxiliary capillary structure are surrounded.
Optional, the length that said auxiliary capillary structure is covered by said master capillary structure account for said tube chamber adiabatic section length 7%~15%.
Optional, the material of said tube wall comprises metal, alloy, the macromolecular material that thermal conductivity is high.
Optional, the tube chamber width between the said master capillary structure is greater than 0.5mm.
Optional, said master capillary structure is powder sintered shape, is formed by the powder particle sintering.
Optional, the diameter range of said powder particle is 0.1mm to 0.18mm.
Optional, said powder particle is ceramic powder particle or is metal powder granulates.
Optional, the thickness of said master capillary structure is greater than the auxiliary capillary thickness of structure.
Optional, the auxiliary capillary structure is a wire mesh shape, is formed by the individual layer silk screen sintering.。
Optional, said individual layer screen thickness is less than 0.15mm.
Optional, the material of said individual layer silk screen is a copper
For addressing the above problem; The present invention also provides a kind of manufacturing approach of flat radiating tube; Said flat radiating tube is processed by a pipe; Said pipe comprises tube chamber and surrounds the tube wall of said tube chamber vertically that the tube chamber of said pipe and tube wall are defined as evaporator section, adiabatic section and condensation segment vertically successively, comprise the steps:
At the adiabatic section and the inboard auxiliary capillary structural material that covers of condensation segment of said tube wall, the said auxiliary capillary structural material of sintering forms auxiliary capillary structure precursor;
In said pipe, insert a tube core; Said tube core comprises fills out powder section and positioning section; The said tube wall of powder section and positioning section and said evaporator section and the part auxiliary capillary structure precursor formation packing space of adiabatic section filled out; Fill the master capillary structure material to said packing space, the said master capillary structure material of sintering forms the master capillary structure precursor;
Extract said tube core, seal an end of said pipe, fill working media in the tube chamber of said master capillary structure precursor and the encirclement of auxiliary capillary structure precursor, vacuumize and seal the other end of said pipe;
Flatten the pipe of said closed at both ends; Form flat radiating tube; Have in the tube chamber of said flat radiating tube by said master capillary structure precursor and flattened the auxiliary capillary structure that the back forms by the master capillary structure that forms after flattening with by said auxiliary capillary structure precursor; Said master capillary structure contacts with the tube wall of said evaporator section, and extends to the adiabatic section of tube chamber, and said auxiliary capillary structure contacts with the tube wall of said adiabatic section and condensation segment; In the adiabatic section of tube chamber, the said auxiliary capillary structure of part is covered by said master capillary structure
Optional, the sintering temperature that forms said auxiliary capillary structure precursor is 850 degree.
Optional, the sintering temperature that forms said master capillary structure precursor is 950 degree.
Optional, said master capillary structure material is a powder particle.
Optional, said auxiliary capillary structural material is the individual layer silk screen.
Compared with prior art, technique scheme has the following advantages:
1. be provided with the compound capillary structure of forming by master capillary structure and auxiliary capillary structure in the flat radiating tube; Compare with single capillary structure; Compound capillary structure is not easy to occur situations such as distortion, disintegration; Thereby compound capillary structure guaranteed the conveying capacity to working media, thereby can prevent declining to a great extent and the increase of thermal resistance of radiating tube maximal heat transfer amount.
2. be provided with the compound capillary structure of forming by master capillary structure and auxiliary capillary structure in the flat radiating tube; Said master capillary structure contacts with the tube wall of said evaporator section; Said auxiliary capillary structure contacts with the tube wall of said adiabatic section and condensation segment; The part that master capillary structure extends to the adiabatic section of tube chamber covers said auxiliary capillary structure; Above-mentioned covering design makes two kinds of capillary structures can be good at contact; Promptly when the terminal working media of condensation segment flow to the junction of master capillary structure and auxiliary capillary structure, the part of having only said master capillary structure to extend to the adiabatic section of tube chamber covers said auxiliary capillary structure just can give full play to the advantage of compound capillary structure, improved the radiating tube heat transfer property thereby reach better backflow effect.
3. be provided with the compound capillary structure of forming by master capillary structure and auxiliary capillary structure in the flat radiating tube; Wherein, master capillary structure is arranged at the evaporator section of this flat radiating tube, adopts powder sintered capillary structure; The auxiliary capillary structure is arranged at the adiabatic section and the condensation segment of this flat radiating tube; Adopt the screen net structure of thinner thickness to replace powder sintered capillary structure, increased adiabatic section and condensation segment volume largely, promptly in the axial section of radiating tube at the gas passage of flat radiating tube; Increased the tube chamber width between the auxiliary capillary structure; Improved the ponding problem of flat radiating tube, thereby improved the backflow efficient of working media, improved the radiating tube heat transfer property greatly in adiabatic section and condensation segment generation.
The specific embodiment
The invention provides a kind of NEW TYPE OF COMPOSITE capillary structure radiating tube; This radiating tube main body adopts powder sintered capillary structure; To flatten the back big or in the axial section of radiating tube because of powder sintered capillary structure layer thickness but in order to improve radiating tube; In order to improve tube chamber width between the radiating tube capillary structure relatively very little and the adiabatic section and the condensation segment ponding problem that cause; This invention adopts the screen net structure of capillary structure layer thinner thickness to replace powder sintered structure radiating tube adiabatic section and condensation segment; The volume that has increased adiabatic section and the condensation segment main gas passage after flattening largely promptly in the axial section of radiating tube, has increased the tube chamber width between the capillary structure, has improved radiating tube and has flattened the ponding problem that produces to very thin back.Improved the backflow efficient of working media, this kind compound capillary structure has improved the radiating tube heat transfer property greatly.
Elaborate below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 2 is the axial section sketch map of the flat radiating tube of the embodiment of the invention, and Fig. 3 is a flat radiating tube shown in Figure 2 schematic cross-section in the AA direction, and Fig. 4 is a flat radiating tube shown in Figure 2 schematic cross-section in the BB direction.In conjunction with Fig. 2, Fig. 3 and Fig. 4, flat radiating tube 10 comprises tube wall 11 and tube chamber, the closed at both ends of tube chamber, and tube wall 11 is processed by the material of tool thermal conductive resins such as copper, aluminium, surrounds tube chamber vertically, and said axially be the direction of the flat heat radiation tubular axis X in edge.Said flat radiating tube 10 (comprising tube wall 11 and tube chamber) is defined as evaporator section 111, adiabatic end 112 and condensation segment 113 vertically successively.
In conjunction with Fig. 3 and Fig. 4, two flat wall 15 that tube wall 11 comprises the arcwall 16 that is positioned at both sides and connects said arcwall 16.Above-mentioned two flat wall 15 are parallel to each other, and the arc of the arcwall 16 of both sides is positioned at the relative both sides of two flat wall 15 to tube chamber outside protrusion and symmetry.
In conjunction with Fig. 3 and Fig. 4; Be provided with compound capillary structure in the tube chamber of said flat radiating tube 10, compound capillary structure contacts with the tube wall 11 of flat radiating tube, is used to support flat radiating tube 10; In the present embodiment; The tube wall 11 of compound capillary structure and flat radiating tube 10 is fit-states, can support the tube wall 11 of flat radiating tube 10 preferably, and can improve the capillary force of capillary structure.Compound capillary structure comprises master capillary structure 12 and auxiliary capillary structure 13.As shown in Figure 2, master capillary structure 12 is fitted with the tube wall 11 of said evaporator section 111, and is extended to tube chamber adiabatic section 112; Auxiliary capillary structure 13 is fitted with the tube wall of said adiabatic section 112 and condensation segment 113, and in the adiabatic section 112 of tube chamber, the said auxiliary capillary structure 13 of part is covered by said master capillary structure 12.
All be main gas passage 14 with auxiliary capillary structure 13 in the tube chamber except master capillary structure 12; Promptly main gas passage 14 comprises evaporator section 111, adiabatic section 112 and the condensation segment 113 of the tube chamber that master capillary structure 12 and auxiliary capillary structure 13 are surrounded; As shown in Figure 2; So in the axial section of flat radiating tube 10, main gas passage 14 greater than the width W of main gas passage at evaporator section 111, is full of working media (not shown) in the main gas passage 14 in the width W 1 of condensation segment 113.
As shown in Figure 2; The length of flat radiating tube 10 is L, can be 80mm to 400mm in the present embodiment, is preferably 200mm; Flat radiating tube 10 comprises evaporator section 111, adiabatic section 112 and condensation segment 113 vertically; Wherein evaporator section 111 is positioned at an end of flat radiating tube 10, and the length of evaporator section 111 is 1/3rd of flat radiating tube 10 length L, and condensation segment 113 is positioned at the other end of flat radiating tube 10; The length of condensation segment 113 is 1/3rd to 1/2nd of flat radiating tube 10 length L, and the length of the condensation segment 113 of present embodiment can be 1/3rd of flat radiating tube 10 length L; Adiabatic section 112 connects the evaporator section 111 and condensation segment 113 of flat radiating tube 10; Therefore the length of adiabatic section 112 is that the length L of whole flat radiating tube 10 deducts the length of evaporator section 111 and the length of condensation segment 113, and the length of adiabatic section 112 can be 1/3rd of flat radiating tube 10 length L in the present embodiment.Flat radiating tube 10 is divided into tube wall 11 and tube chamber two parts, and the heat that heat generating component produces can be passed to tube chamber by tube wall 11.
Like Fig. 3 and shown in Figure 4; The thickness H of flat radiating tube 10 can be less than or equal to 1.5mm, is 1.5mm at present embodiment, and tube wall 11 thickness are h; The h of present embodiment can be 0.3mm; The tube wall 11 of flat radiating tube 10 is divided into flat wall 15 and is parallel to each other with 16, two flat wall 15 of arcwall, and the arc of two arcwalls 16 of flat radiating tube 10 is positioned at the relative both sides of two flat wall 15 to tube chamber outside protrusion and symmetry; One of them flat wall 15 is connected with two arcwalls 16, and another flat wall 15 also is connected with two arcwalls 16.
As shown in Figure 2; The tube chamber two ends of flat radiating tube 10 are closed; Compound capillary structure is positioned at the tube chamber of flat radiating tube 10, and compound capillary structure comprises 13 two kinds on master capillary structure 12 and auxiliary capillary structure, and master capillary structure 12 is formed by the powder particle sintering; Be sintering shape structure, the powder particle that is used for powder sintered processing can or be metal powder granulates such as copper powder etc. for ceramic powder particle.Master capillary structure 12 is fitted with the tube wall of said evaporator section 111, and extends to tube chamber adiabatic section 112; In conjunction with Fig. 2, Fig. 3 and Fig. 4; In the tube chamber adiabatic section 112; Extend to the said auxiliary capillary structure 13 in part cover part of the master capillary structure 12 of tube chamber adiabatic section 112; Be the surface that master capillary structure 12 is covered in auxiliary capillary structure 13, the length (part of master capillary structure 12 that promptly extends to the adiabatic section 112 of tube chamber covers the length of said auxiliary capillary structure 13) that said master capillary structure 12 covers said auxiliary capillary structure 13 account for said tube chamber adiabatic section 112 length 7%~15%.
Master capillary structure 12 is supporting flat radiating tube 10; Prevent that flat radiating tube 10 surfaces from producing significantly depression; Cause flat radiating tube 10 can produce working media in actual use and be blocked mobile situation, effectively guaranteed main gas passage 14 unimpeded of flat radiating tube 10.Another effect of master capillary structure 12 is to produce stronger capillary force; The working media that flat radiating tube 10 condensation segments 113 is condensed form is at the evaporator section 111 of effect refluxed to the flat radiating tube 10 of master capillary structure capillary force; Realize the shuttling movement of working media in flat radiating tube 10, to accomplish lasting heat radiation to heat generating component.
Auxiliary capillary structure 13 is formed by silk screen sintering, belongs to the wire mesh shape structure.As shown in Figure 2; Auxiliary capillary structure 13 is fitted with the tube wall of said adiabatic section 112 and condensation segment 113; The length that is auxiliary capillary structure 13 equals the length of flat radiating tube 10 tube chamber adiabatic sections 112 and the length addition of condensation segment 113, can be 2/3L at present embodiment.In tube chamber adiabatic section 112; The surface of said part auxiliary capillary structure 13 is covered by said master capillary structure 12; In the adiabatic section 112 of tube chamber, the length that said part auxiliary capillary structure 13 is covered by said master capillary structure 12 account for said tube chamber adiabatic section length 7%~15%.The distance of the surface of auxiliary capillary structure 13 to flat radiating tube tube wall 11 is less than the distance of surface to the flat radiating tube tube wall 11 of master capillary structure 12, and promptly the thickness of auxiliary capillary structure 13 is less than the thickness of master capillary structure 12.
Auxiliary capillary structure 13 works to support flat radiating tube 10 equally; Auxiliary capillary structure 13 also can produce capillary force; Because in the present embodiment; The length of auxiliary capillary structure 13 equal flat radiating tube 10 condensation segment 113 length and adiabatic section 112 length with; This auxiliary capillary structure 13 enough capillary forces that can produce help master capillary structure 12 that flat radiating tube 10 condensation segments 113 terminal working medias are transported to the evaporator section 111 of flat radiating tube 10 like this, compared to the radiating tube that has single capillary structure, and the composite capillary structure 12 of above-mentioned flat radiating tube 10 and the 13 effective heat transfer efficiencys of raising radiating tubes.Auxiliary capillary structure 13 is the individual layer silk screen sintering, and thickness can be the individual layer copper mesh in the present embodiment below 0.15mm.Auxiliary capillary structure 13 can guarantee the volume of flat radiating tube 10 main gas passages 14 like this; Promptly in the axial section of radiating tube; Increased the tube chamber width between the capillary structure, in the present embodiment, as shown in Figure 2; Especially the part adiabatic section 112 of flat radiating tube and the width W 1 of the main gas passage of condensation segment 113 have been increased; Improve the condensation segment seeping phenomenon that radiating tube causes when flattening to thinner thickness, improved the service efficiency of working media, improved the performance of radiating tube.
As shown in Figure 2; Adiabatic section 112 at flat radiating tube 10; The part that said master capillary structure 12 extends to the adiabatic section 112 of tube chamber covers said auxiliary capillary structure 13; Be the surface that master capillary structure 12 is covered in auxiliary capillary structure 13, overlay length account for said tube chamber adiabatic section 112 length 7%~15%.In flat radiating tube 10; The covering design that the part that said master capillary structure 12 extends to the adiabatic section 112 of tube chamber covers said auxiliary capillary structure 13 makes two kinds of capillary structures can be good at contact; Give full play to the advantage of compound capillary structure; Be in the process of the terminal working medias of condensation segment 113 evaporator section 111 that flows to flat radiating tube 10; Especially when condensation segment 113 terminal working medias flow to the junction of master capillary structure 12 and auxiliary capillary structure 13,, make condensation segment 113 terminal working medias better flow to the evaporator section 111 of flat radiating tube 10 in order to reach better backflow effect; Master capillary structure 12 is covered in the surface of auxiliary capillary structure 13, and accounts for 7%~15% of said tube chamber adiabatic section 112 length with auxiliary capillary structure 13 overlap lengths.If master capillary structure 12 and auxiliary capillary structure 13 overlapping points or contact point are more after a little while; Be unfavorable for that condensation segment 113 terminal working medias flow to the evaporator section 111 of flat radiating tube 10; If master capillary structure 12 and auxiliary capillary structure 13 overlap lengths were greater than 15% o'clock of tube chamber adiabatic section 112 length; The volume of compound capillary structure can occupy the volume of main gas passage; Make condensation segment produce the ponding problem easily, influence the backflow effect of working media equally, influence the lasting heat radiation of 10 pairs of heat generating components of flat radiating tube.
All be main gas passage 14 with auxiliary capillary structure 13 in flat radiating tube 10 tube chambers except master capillary structure 12; Therefore; This main gas passage 14 also is flat, and the length of main gas passage 14 is the length L of flat radiating tube 10, and is as shown in Figure 2; The distance of the surface of master capillary structure 12 to flat radiating tube tube wall 11 is greater than the distance of surface to the flat radiating tube tube wall 11 of auxiliary capillary structure 13; Be the thickness of the thickness of master capillary structure 12 greater than auxiliary capillary structure 13, thus in the axial section of flat radiating tube, main gas passage 14 in the width W 1 of condensation segment 113 greater than the width W of main gas passage 14 at evaporator section 111.Be full of working media in this main gas passage 14, the main gas passage 14 of flat radiating tube 10 at least more than or equal to 0.5mm, has guaranteed the conveying capacity to working media in the width W of evaporator section 111, can effectively promote the suction exothermic effect of working media.
Above-mentioned working media is the liquid hydraulic fluid that heat of vaporization height, good fluidity, chemical property are stable, boiling point is lower, like water, alcohol, methyl alcohol, acetone etc.Have 2~4 * 10 in the cavity of flat radiating tube 10
-3The negative pressure of Pa.The start principle of above-mentioned working media is: flat radiating tube 10 is ultra-thin shape radiating tube;, the evaporator section 111 of flat radiating tube 10 conducts to flat radiating tube 10 internal work media after being heated; Working media is that the phase transformation effect of gaseous state makes a large amount of heat by with the evaporator section 111 from flat radiating tube 10 by liquid transformation in the tube chamber of flat radiating tube 10; It transfers to the condensation segment 113 of flat radiating tube 10 via the adiabatic section 112 of flat radiating tube 10; And working media steam condenses into liquid working media after flowing to these condensation segment 113 heat releases under the small pressure reduction, and heat is discharged, and accomplishes the heat radiation to heat generating component.
Compound capillary structure 12 and 13 has guaranteed that effectively the main gas passage 14 of flat radiating tube 10 has enough spaces; Promptly the master capillary structure 12 of this flat radiating tube adopts powder sintered capillary structure; Part adiabatic section 112 adopts the copper mesh structure of capillary structure layer thinner thickness to replace powder sintered structure with condensation segment 113; Adiabatic section 112 and the volume of condensation segment 113 have been increased largely at the main gas passage 14 of flat radiating tube 10; Therefore; Compound capillary structure produces capillary force is transported to condensed liquid working media flat radiating tube 10 from the condensation segment 113 of flat radiating tube evaporator section 111 jointly; Improved flat radiating tube 10 in the adiabatic section the 112 ponding problems that are easy to generate with condensation segment 113, can effectively promote the suction exothermic effect of working media, and then improve the overall performance of flat radiating tube.
According to another aspect of the present invention; A kind of manufacturing approach of above-mentioned flat radiating tube also is provided; Said flat radiating tube is processed by a pipe, and said pipe comprises tube chamber and surround the tube wall of said tube chamber vertically, and the tube chamber and the tube wall of said pipe is defined as evaporator section, adiabatic section and condensation segment vertically successively; As shown in Figure 5, said manufacturing approach comprises step:
S301, at the adiabatic section and the inboard auxiliary capillary structural material that covers of condensation segment of said tube wall, the said auxiliary capillary structural material of sintering forms auxiliary capillary structure precursor;
S302; In said pipe, insert a tube core; Said tube core comprises fills out powder section and positioning section; The said tube wall of powder section and positioning section and said evaporator section and the part auxiliary capillary structure precursor formation packing space of adiabatic section filled out filled the master capillary structure material to said packing space, and the said master capillary structure material of sintering forms the master capillary structure precursor;
S303 extracts said tube core, seals an end of said pipe, fill working media in the tube chamber of master capillary structure precursor and the encirclement of auxiliary capillary structure precursor, vacuumize and seal the other end of said pipe;
S304; Flatten the pipe of said closed at both ends; Form flat radiating tube, have in the tube chamber of said flat radiating tube by said master capillary structure precursor and flattened the auxiliary capillary structure that the back forms by the master capillary structure that forms after flattening with by said auxiliary capillary structure precursor, said master capillary structure contacts with the tube wall of said evaporator section; And extend to the tube chamber adiabatic section; Said auxiliary capillary structure contacts with the tube wall of said adiabatic section and condensation segment, and in the adiabatic section of tube chamber, the said auxiliary capillary structure of part is covered by said master capillary structure.
The flat radiating tube of present embodiment is processed by a pipe, and said pipe comprises tube chamber and surround the tube wall of said tube chamber vertically that the tube chamber of said pipe and tube wall are defined as evaporator section, adiabatic section and condensation segment vertically successively.Before making flat radiating tube, at first need the inside of said pipe to be removed totally, remove burr, then pipe is put into and uses ultrasonic waves for cleaning in the dilute sulfuric acid.After cleaning up, just can obtain all very smooth, oxide-free pipe of an inside and outside wall.This pipe is processed by the material of tool thermal conductive resins such as copper, aluminium.The length of pipe is L, and the length range of pipe can be 80mm to 400mm in the present embodiment, is preferable with 200mm.As shown in Figure 6; The inside radius of pipe 10 ' can be 2.7mm in the present embodiment, and the outer radius of pipe 10 ' in the present embodiment can be for equaling 3mm, and pipe 10 ' comprises tube chamber and tube wall 11; The difference of interior outer radius is exactly the thickness of tube wall 11, and present embodiment is 0.3mm.
In the present embodiment, corresponding to figure 6, be followed successively by evaporator section 111, adiabatic section 112 and condensation segment 113 vertically from an end of pipe 10 '.The length of evaporator section 111 is 1/3rd of this pipe 10 ' length L; The length of the evaporator section 111 of present embodiment can be 1/3rd of pipe 10 ' length; Condensation segment 113 is positioned at the other end of this pipe 10 '; The length of condensation segment 113 is 1/3rd to 1/2nd of this pipe 10 ' length L; The length of the condensation segment 113 of present embodiment can be 1/3rd of pipe 10 ' length; Adiabatic section 112 connects evaporator sections 111 and condensation segments 113, so the length of adiabatic section 112 deducts the length of evaporator section 111 and the length of condensation segment 113 for the length of this pipe 10 ', and the length of adiabatic section 112 also can be 1/3rd of this pipe 10 ' length in the present embodiment.Fig. 6 to Figure 12 is elaborated to above-mentioned manufacturing approach below in conjunction with Fig. 6 to Figure 12 for the sketch map of flat radiating tube structure manufacture process among the embodiment of manufacturing approach of the present invention.
At first execution in step S301 covers the said auxiliary capillary structural material formation of auxiliary capillary structural material sintering auxiliary capillary structure precursor in the adiabatic section and the condensation segment inboard of said tube wall.
The auxiliary capillary structural material is inserted pipe 10 ' from an end of pipe; In the present embodiment; Said auxiliary capillary structural material can be less than or equal to 0.15mm individual layer silk screen for thickness; This individual layer silk screen is sticked the tube wall inboard in said adiabatic section 112 and condensation segment 113, and said individual layer silk screen can be the individual layer copper mesh in the present embodiment.The pipe that is built-in with the individual layer copper mesh 10 ' put into 850 degrees centigrade high temperature sintering furnace; Make the inwall sintering of individual layer copper mesh and pipe adiabatic section 112 and condensation segment 113 be in the same place; Form auxiliary capillary tubular construction precursor 13 '; As shown in Figure 6; The auxiliary capillary structure precursor 13 ' that forms is fitted with the adiabatic section 112 of tube wall and condensation segment 113, and the length of auxiliary capillary structure precursor 13 ' 112 extends to condensation segment 113 from the adiabatic section, can be 2/3rds of said pipe length L at present embodiment.Concrete processing step is well known to those skilled in the art, repeats no more at this.
Execution in step S302 then; In said pipe, insert a tube core; Said tube core comprises fills out powder section, positioning section; The said tube wall of powder section and positioning section and said evaporator section and the part auxiliary capillary structure precursor formation packing space of adiabatic section filled out filled the master capillary structure material to said packing space, and the said master capillary structure material of sintering forms the master capillary structure precursor.Fig. 7 is the axial sketch map of present embodiment tube core, and tube core 30 is divided into four sections, is followed successively by to add powder section 311, positioning section 312, linkage section 313 and supporting section 314.Tube core 30 plays the mould effect in the manufacturing process of flat radiating tube 10.
As shown in Figure 8, said tube core 30 is inserted in the pipe 10 ' from pipe 10 ' condensation segment 113, make the supporting section 314 of tube core 30 prop up the end of pipe 10 ' near condensation segment 113, guarantee that pipe 10 ' does not have slip with respect to tube core 30 at pipe 10 ' axial direction.Positioning section 312 also fits tightly with the part adiabatic section 112 of pipe 10 ', and is as shown in Figure 8, said powder section 311 and positioning section 312 and the tube wall of said evaporator section 111 and part auxiliary capillary structure precursor 13 ' the formation packing space 12 of adiabatic section 112 filled out ".The length of the evaporator section of pipe 10 ' is La, said packing space 12 " length be Lb, the length difference of La and Lb account for said pipe tube chamber adiabatic section 112 length 7%~15%.
As shown in Figure 9, to said packing space 12 " fill the master capillary structure material, said master capillary structure material can be powder particle, said powder particle comprises ceramic powder particle and is metal powder granulates.In the present embodiment, choose copper powder, the particle diameter scope of copper powder is 0.1mm~0.18mm.If the particle diameter of copper powder is less than 0.1mm, the penetration of the master capillary structure that the copper powder sintering forms makes the heat flux of flat radiating tube reduce inadequately; If the particle diameter of copper powder is greater than 0.18mm, the capillary force of the master capillary structure that the copper powder sintering forms is not enough, makes the working media of condensation segment 113 can't normally be back to evaporator section 111.Positioning section 312 need fit tightly with the part adiabatic section 112 of pipe 10 ', prevents that the copper powder particle of inserting in the pipe from leaking to the zone of positioning section below 312, guarantees that copper powder particle is all at packing space 12 " in.Insert in the 950 celsius temperature stoves and carry out sintering filling out pipe 10 ' behind the powder; Said copper powder particles sintering is formed master capillary structure precursor 12 '; Master capillary structure precursor 12 ' tube core 30 add the powder section and auxiliary capillary structure precursor 13 ' is overlapping; Auxiliary capillary structure precursor 13 ' contacts at the tube wall of this section with the part adiabatic section, and auxiliary capillary structure precursor 13 ' also contacts with master capillary structure precursor 12 ' in this section.The vertical range of surface to the tube wall of master capillary structure precursor 12 ' is greater than the vertical range of surface to the tube wall of auxiliary capillary structure precursor 13 ' at this moment, and promptly the thickness of master capillary structure precursor 12 ' is greater than the thickness of auxiliary capillary structure precursor 13 '.Concrete processing step is well known to those skilled in the art, repeats no more at this.
Execution in step S303 extracts said tube core then, seals an end of said pipe, fill working media in the tube chamber of master capillary structure precursor and the encirclement of auxiliary capillary structure precursor, vacuumize and seal the other end of said pipe.
Specifically, sintering is intact fill out the pipe 10 ' behind the powder after, uses an aid to clamp pipe 10 ', tool using is extracted tube core 30 out, and an end of pipe one end of condensation segment (for example near) is sealed filling working media in pipe 10 '.Above-mentioned working media is the liquid hydraulic fluid that heat of vaporization height, good fluidity, chemical property are stable, boiling point is lower, like water, alcohol, methyl alcohol, acetone etc.Concrete processing step is well known to those skilled in the art, repeats no more at this.
With vaccum-pumping equipment with being pumped into 2~4 * 10 in the pipe 10 '
-3The negative pressure of Pa helps the circulation of working media in the heat radiation process.The other end (present embodiment is the end near evaporator section) with pipe 10 ' carries out the tube sealing PROCESS FOR TREATMENT then, forms radiating tube shown in figure 10.Figure 11 is the generalized section of the evaporator section of the said radiating tube of Figure 10 AA direction perpendicular to axial direction; Figure 12 is the generalized section of the condensation segment of the said radiating tube of Figure 10 BB direction perpendicular to axial direction.The concrete grammar of evacuation process and tube sealing technology is well known to those skilled in the art, repeats no more at this.
Execution in step S304 then; Flatten the pipe of said closed at both ends, form flat radiating tube, have in the tube chamber of said flat radiating tube by said master capillary structure precursor and flattened the auxiliary capillary structure that the back forms by the master capillary structure that forms after flattening with by said auxiliary capillary structure precursor; Said master capillary structure contacts with the tube wall of said evaporator section; And extend to the tube chamber adiabatic section, said auxiliary capillary structure contacts with the tube wall of said adiabatic section and condensation segment; And in the adiabatic section of tube chamber, being covered of the said auxiliary capillary structure of part by said master capillary structure.
Flatten the pipe 10 ' of said closed at both ends, form flat radiating tube 10.In conjunction with Fig. 3 and Figure 11, Fig. 4 and Figure 12, the thickness of pipe 10 ' is 2R, present embodiment can be 6mm, the thickness H of flat radiating tube 10 in the present embodiment, can be 1.5mm less than 1.6mm.The tube wall of said pipe 10 ' is flattened the tube wall that the back forms flat radiating tube, and the tube chamber of said pipe 10 ' is flattened the tube chamber that the back forms flat radiating tube 10.After pipe 10 ' is flattened; The tube wall of said pipe 10 ' is flattened the tube wall 11 that the back forms flat radiating tube; Wherein, The tube wall 11 of said flat radiating tube comprises arcwall 16 that is positioned at both sides and the flat wall 15 that connects said arcwall, is provided with in the tube chamber of said flat radiating tube 10 by said master capillary structure precursor 12 ' and is flattened the auxiliary capillary structure 13 that the back forms by the master capillary structure 12 that forms after flattening with by said auxiliary capillary structure precursor 13 '.
With reference to figure 2, said master capillary structure 12 contacts with the tube wall of said evaporator section, and extends to tube chamber adiabatic section 112; Adiabatic section 112 at tube chamber; Master capillary structure 12 is covered on the surface of part auxiliary capillary structure 13, and said auxiliary capillary structure 13 contacts with the tube wall of said adiabatic section and condensation segment; And in the adiabatic section 112 of tube chamber, the surface of the said auxiliary capillary structure 13 of part is covered by said master capillary structure 12.The overlap length of master capillary structure 12 and auxiliary capillary structure 13 account for said tube chamber adiabatic section 112 length 7%~15%.The thickness of master capillary structure 12 is greater than the thickness of auxiliary capillary structure 13, thus in the axial section of flat radiating tube, main gas passage 14 in the width W 1 of condensation segment 113 greater than the width W of main gas passage 14 at evaporator section 111.The concrete grammar of flattening above-mentioned pipe 10 ' is well known to those skilled in the art, repeats no more at this.
The measurement parameter of radiating tube performance is average maximal heat transfer amount Q
Max(unit: W) with average thermal resistance R
Th(unit: ℃/W).Average maximal heat transfer amount Q
MaxBe the maximal heat transfer amount of radiating tube when operating temperature is 50 ℃; Evenly heat resistance R
ThFor the temperature gap of the evaporator section mean temperature of radiating tube and condensation segment mean temperature again and Q
MaxRatio.Average maximal heat transfer amount Q
MaxValue big more, explain that the performance of radiating tube is good more, average thermal resistance R
ThValue more little, explain that the performance of radiating tube is good more; Vice versa.
Two kinds of radiating tubes before flattening are compared the radiating tube of finding to have compound capillary structure is lower than the radiating tube thermal resistance with traditional single capillary structure, heat transfer property is strong.
Specifically; With a specification is that (diameter is 6mm to φ 6 * 200mm; Length is 200mm) the pipe 10 ' of the compound capillary structure of forming by master capillary structure precursor 12 ' and auxiliary capillary structure precursor 13 ' of the same size made according to the manufacturing approach in the embodiments of the invention of the radiating tube 100 ' with single powder sintered capillary structure and compare, as shown in table 1.
The performance comparison form of table 1 radiating tube 100 ' and pipe 10 '
As shown in table 1, have pipe 10 ' the available average maximal heat transfer amount Q of master capillary structure precursor and auxiliary capillary structure precursor
MaxExceed than the radiating tube with single powder sintered capillary structure 100 ' about 25%, the evenly heat resistance R of pipe 10 '
ThLess than radiating tube 100 ', the pipe 10 ' heat transfer property that is provided with compound capillary structure significantly promotes.
If above-mentioned two types radiating tube is flattened the flat radiating tube of formation; A kind of for the flat radiating tube with compound capillary structure of preferred embodiments of the present invention; Another is the identical flat radiating tube with single capillary structure of specification, and the former is lower than the latter's thermal resistance, heat transfer property is strong.
Specifically, it is thick that a specification is that the conventional powder sintering post radiating tube of φ 6 * 200mm (diameter is 6mm, and length is 200mm) is flattened to 1.5mm, forms flat radiating tube 100.According to the manufacturing approach in the embodiments of the invention pipe of a same size (diameter is 6mm, and length is 200mm) is manufactured the flat radiating tube 10 of the thick compound capillary structure of forming by master capillary structure 12 and auxiliary capillary structure 13 of 1.5mm then.The performance of flat radiating tube 100 with flat radiating tube 10 compared, as shown in table 2.
The performance comparison form of flat radiating tube 100 of table 2 and flat radiating tube 10
As shown in table 2, have the flat radiating tube 10 available average maximal heat transfer amount Q of compound capillary structure
MaxExceed than flat radiating tube 100 with single capillary structure about 140%, the evenly heat resistance R of flat radiating tube 10
ThTherefore less than flat radiating tube 100, having has the flat radiating tube of compound capillary structure 10 heat transfer properties to compare the flat radiating tube 100 with single capillary structure significantly to promote.
And, can see that from table 1 and table 2 radiating tube with compound capillary structure is littler by the changing value of the average maximal heat transfer amount before and after flattening than the radiating tube with single capillary structure by the changing value of the average maximal heat transfer amount before and after flattening; Radiating tube with compound capillary structure is littler by the changing value of the average thermal resistance before and after being flattened than the radiating tube with single capillary structure by the changing value of the average thermal resistance before and after being flattened, and the thermal loss that promptly forms in the process of flattening than the radiating tube with single capillary structure in the process of flat radiating tube of the radiating tube of explanation with compound capillary structure is little thus.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting claim; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.