CN1053119A - Metal composite mesh on two surfaces intensify heat transfer pipe and heat transfer plate - Google Patents
Metal composite mesh on two surfaces intensify heat transfer pipe and heat transfer plate Download PDFInfo
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- CN1053119A CN1053119A CN 91100831 CN91100831A CN1053119A CN 1053119 A CN1053119 A CN 1053119A CN 91100831 CN91100831 CN 91100831 CN 91100831 A CN91100831 A CN 91100831A CN 1053119 A CN1053119 A CN 1053119A
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- heat transfer
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Abstract
The invention provides a kind of strengthening heat transfer, reduce heat transfer temperature difference, improve critical thermal load and with metal porous property tectal (single or multiple lift) the efficient heat transfer mass transfer component and the manufacture method thereof with unlike material of energy-saving effect: the metal surfaces externally and internally of unlike material (or one side) composite web intensify heat transfer pipe and heat transfer plate.
Description
The invention belongs to the diabatic process enhanced heat transfer component
The cover layer of having porous or other geometry at the metal surfaces externally and internally of unlike material is one of effective ways of augmentation of heat transfer, and it can adopt multiple manufacture method to obtain.
From reported in literature as can be known, commonplace in the world manufacture method mostly is sintering process, mechanical processing method at present, galvanoplastic and flame spraying, and its feature mainly is:
1. sintering process: according to U.S. Pat P3,384,154 and USP3,607,369 reports are bonded on the copper pipe of handling or aluminum tube surfaces, under 510～850 ° high temperature with copper powder, aluminium powder or alloyed powder and the low-melting-point metal powder of organic bond carrier with the certain granules degree, make the adhesive decomposition evaporation, the metal powder particle then with the tube wall sintering together.Adopt the acid wash dissolving to remove for the low-melting-point metal powder.Like this, just can obtain forming thickness less than 3 millimeters on copper pipe or aluminum tube surfaces, porosity is 40～60% porous layer.But its processing technology complexity, the hole irregularity, connective poor, energy consumption is big, and the cost height has three-waste pollution, and at high temperature is easy to generate deformation annealing.
2. mechanical processing method: according to U.S. Pat P3,696,861 and Chinese patent CN87 2 17208U, CN2047001U and Japanese numerous patent report, its manufacture method is:
(1) with the cutter of particular design on special purpose machine tool, copper, aluminium and compo pipe outer surface thereof directly process different shape fin, fine pore and below be the spirality tunnel of different shape.
(2) directly process in copper, aluminium and compo pipe appearance thereof with rolling (roll extrusion) method and have low thread shape fin, the surface detail pipe of low rib shape fin or different shape.
(3) draw out axial grooves such as V-arrangement with special type knife at copper, aluminium and compo pipe inner surface thereof.
The mechanical processing method cost is lower, and processing is simple.But to the original size tolerance strictness of tubing, and only be applicable to soft metal tubing, the porous layer porosity that makes only has 30～35%, and the porous layer aperture of other manufacture method moulding is big relatively, and result of use is not remarkable in the less medium of surface tension.
3. galvanoplastic: according to U.S. Pat P4,018,264 and USP4,129,181 reports are plated to the copper pipe outer surface with copper powder in electroplate liquid, and the porosity that forms 0.4 millimeters thick is 40～55% porous copper coating.According to day disclosure special permission newspaper " clear 53-138969 ", " clear 54-76440 " and Chinese patent CN85 1 02762A report, in electrolyte, utilize intergranular and pitting corrosion principle, stainless steel outer surface and inside corrosion are gone out the porous surface layer.And the aperture of porous layer is less, and pore size distribution is inhomogeneous, and result of use is not remarkable in the bigger medium of surface tension.Owing to intercrystalline corrosion takes place, the body intensity of material is descended.Because processing technology complexity, process-cycle are long, make cost and energy consumption all bigger, and three-waste pollution is arranged.
4. flame spraying: according to DRP DT2227747, U.S. Pat P3,990,862 and Chinese patent CN85 1 00996A report, adopt special flame-spraying rifle, utilize high-molecular organic material powder or the low-melting-point metal mixture of powders of specific flame, be ejected into treated at high speed varigrained metal dust (as aluminium powder, copper powder, stainless steel powder etc.) and auxiliary pore creating material, on the metal tube outer surface matrix of preheating, produce certain chemical metallurgy combination.And then unnecessary high-molecular organic material powder is burnt or with acid solution low-melting-point metal fusion is removed with flame, be that 0.3～0.6 millimeter, porosity are 30～45% metal porous coating thereby obtain thickness.
This method can be at carbon steel pipe, and copper and aluminium and compo pipe thereof, stainless steel tube outer surface cover porous metallic layers such as going up aluminium, copper, stainless steel, and processing cost decreases.But, can not produce metal porous layer at inner surface of tube, and porous layer thickness and aperture inequality, and have environmental pollution, the boiling heat transfer that strengthening effect is only arranged also is difficult to reach optimum organization.
The purpose of this invention is to provide a kind of strengthening heat transfer, reduce heat transfer temperature difference, improve critical thermal load and with metal porous property tectal (single or multiple lift) the efficient heat transfer mass transfer component and the manufacture method thereof with unlike material of energy-saving effect: the metal surfaces externally and internally of unlike material (or one side) composite web intensify heat transfer pipe and heat transfer plate.
The composite web of employing pressure welding technology provided by the invention has mesh and is evenly distributed, and is interconnected between the hole, causes the liquid film in the porous layer evenly to distribute, and has promoted liquid film interface and inner turbulent flow, thereby reaches the purpose of strengthening heat transfer.
Adopt metal surfaces externally and internally (or one side) the composite web intensify heat transfer pipe and the heat transfer plate of unlike material provided by the invention, can be used for the heat transmission equipment of manufacturing structure compactness, film-type evaporation equipment and short-path distillation equipment etc.Diabatic process is strengthened, and operating flexibility is big, is more suitable for the processing of a large amount of heat sensitive materials that exist in the Chemical Manufacture.
Principal character of the present invention is that plain weave, the twill, Seats type line woven wire of distinct methods braiding are realized combining securely with the metal tube or the metallic plate of the metal surfaces externally and internally (or one side) of unlike material with non-melt press welding method.And can ensure that the original micropore of woven wire is not destroyed, thereby can obtain having the metal porous property cover layer of high porosity.Certainly, according to the equipment needs that are processed into, also can the single face pressure welding on woven wire.
Pressure welding is when temperature is lower than the fusing point (without solder) of weld metal, and apply certain plus load so that the junction produces necessary plastic deformation, the surface of welding is close in the distance that adhesion works between atom, thereby make the process that produces phase counterdiffusion (infiltration) between the atom on the solder side, to reach the method that produces adhesion.Sometimes can between soldered material contact-making surface, add another kind of material as intermediate course, thereby can improve the scope that this welding method is used widely, and can obtain mechanical performance and the good joint of physical and chemical performance, the especially welding between dissimilar metal.
Welding process of the present invention is to carry out on special welding machine.Parts to be processed all or the part be in the vacuum or in inert gas and protect; utilize induction, radiation or other heating means solder side to be heated to temperature required; under certain plus load effect, keep after a period of time woven wire just and metal tube or metallic plate wall pressure welded together.According to purposes and material properties, the metal tube of various materials or the woven wire of metallic plate and identical or different material can be welded into required product, and the woven wire assembled arrangement of the different model (or order number) that the structure in porous layer thickness, porosity and hole and geomery can be produced according to different weaving methods forms.
Realize that method of the present invention is:
One. material
1. metal tube and metallic plate: copper, aluminium, silver, nickel, titanium and alloy thereof, carbon steel, stainless steel etc.
2. woven wire: copper, aluminium, silver, nickel, titanium and alloy thereof, carbon steel, stainless steel etc.
Two. operating parameter
1. temperature: be generally 400～1800 ℃.The welding temperature of same material be generally metal and alloy fusion temperature 0.6～0.8; And the welding temperature of dissimilar metal is to get fusing point than 0.6～0.86 of the fusion temperature of hanging down metal.The lower limit of said temperature is the activationary temperature that spreads between the recrystallization temperature of welding material and atom; The upper limit of said temperature is the crystal grain of welding material temperature that begins to increase sharp and the temperature that makes material softening.
2. pressure: welding pressure approximately is the yield point of welding material under welding temperature, and does not cause the macroscopic deformation of welding material shape and size in the weld zone along with the kind of soldered material is different and different, general within the scope of 1～110MPa.To the welding of foreign material, should determine pressure according to the performance of lower welding material.
3. time: under given temperature and pressure, guarantee that adequate time can be carried out the atom diffusion process between the solder side, generally need 1～60 minute time, it is just much of that to make the mechanical strength of welding point can equal the mechanical strength limit of base metal.Prolong weld interval excessively, can make grain growth, or the fragility that can produce intermetallic compound during with alloy at the welding dissimilar metal mutually.Generally, be short more good more weld interval.
4. vacuum: welding method of the present invention requires working space to have 10～10 usually
-5The vacuum of pa or be to carry out under the inert gas shielding of anaerobic of 0.03～0.6MPa at pressure is to guarantee that material is not oxidated and to pollute.
Three. technical process
1. the welding front surface is handled: adopt the way of air sand blower to remove iron rust, oxide skin and the greasy dirt of face of weld to carbon steel pipe and plate.Cleaning agents such as the pipe of other metal and alloy thereof and plate employing acetone are removed the greasy dirt of face of weld.Also take identical method to remove greasy dirt to woven wire.
2. preheating: the weldment of handling well is placed on the special welding machine immediately by predetermined ordering, and applies certain plus load that is used for pretension, vacuum chamber is sealed, begin vacuum pumping then.After vacuum reaches certain numerical value, begin the weldment pre-heating temperature elevation, in official hour, weldment is heated to given temperature.
3. welding: relies on controlled certain plus load effect, under given welding temperature, the maintenance regular hour, make interatomic diffusion motion can pass through the joint face of welding material and carried out fully.
4. cooling: after welding finishes,, part is cooled off in a vacuum or in air according to the character of materials to be welded.
5. various materials and mutual combination thereof need be taked different manufacture methods, and variation of operating parameters is bigger, and is as follows according to the technical process example:
Characteristics of the present invention are:
One. adopt the press welding method can be at copper, aluminium, silver, nickel, titanium and alloy thereof, carbon steel, metal tube surfaces externally and internallies such as stainless steel are compound to be gone up identical type or different kinds of metals silk screen and makes the metal surface antipriming pipe.Generally every welding layer of metal silk screen just can make heat transfer area than the long-pending increase of original smooth surface more than 2 times; Its porosity is up to 45～75%, and average pore size can be selected arbitrarily more than 5 microns, and pore-size distribution is very even; Porous layer thickness is also than uniformity, and the porous layer average thickness can be determined its number of plies arbitrarily more than 0.05 millimeter the time; Improve more than 10 times in boiling heat transfer film coefficient under the porous layer condition than plain tube; The mass transfer film coefficient improves more than 3 times than plain tube.
Two. the performance of the mechanical strength of the numerous small solder side of porous surface layer and physical and chemical performance and parent metal is basic identical, thereby has guaranteed metal tube and metallic plate mechanical strength and decay resistance in use.
Three. the wicking property that the height that forms in porous surface layer as thin as a wafer evenly is interconnected, can make liquid film extremely be evenly distributed in the inside and outside of whole heat and mass wall as thin as a wafer, and guarantee fully wetting, thereby:
1. prevent dried wall phenomenon effectively, improved critical thermal load;
2. liquid has the high circulation rate more than 10 times in the porous surface layer, has improved its stain resistance greatly;
3. the countless uniform nucleus of boiling have been strengthened the heat and mass effect, and operating flexibility is increased greatly.
Four. a large amount of stable nucleus of boiling just can be provided under extremely low heat transfer temperature difference, thereby reduce the irreversible loss and the hysteresis of conducting heat, and the boiling degree of superheat is reduced greatly.Conduct heat and mass transfer so be particularly suitable for the membrane type of heat sensitive material, avoided at high temperature being easy to generate the difficulty of polymerization or decomposition.
Five. use the metal surface composite web enhanced heat transfer component of press welding method manufacturing provided by the invention that polytype can be arranged, can make plurality of devices with it, and equipment is simple, easy to operate, the utilization rate of raw materials height, cost is lower, non-environmental-pollution etc.
Embodiment is as follows:
1. adopt said method with 57 * 1.5 millimeters of Φ, long 800 millimeters 1Cr18Ni9Ti steel pipe inwall, welding last layer 120 orders (0.140 millimeter in aperture, 0.071 millimeter in silk directly) and two-layer 280 orders (0.050 millimeter in aperture, the 1Cr18Ni9Ti woven wire of plain weave 0.040 millimeter in silk footpath) is made the downward film evaporator single tube.
Record the boiling heat transfer coefficient up to 4.8 * 10 through experiment
4W/(m
2.k), than plain tube 3.2 * 10
3W/(m
2K) improve 14 times; Critical thermal load surpasses 6.5 * 10
5W/m
2, than plain tube 1.8 * 10
5W/m
2Improve more than 2.6 times; Under 0.3～0.7 ℃ the temperature difference, just can keep the carrying out of boiling process.The porous layer porosity is 63%.
2. with the red copper woven wire of the plain weave of three layer of 120 order (0.140 millimeter in aperture, 0.071 millimeter in silk footpath) in the copper plate one side weld of 4 millimeters thick, then porous layer is welded into 300 millimeters of internal diameters to curls inward, long 2000 millimeters downward film evaporator.
Recording the boiling heat transfer coefficient through experiment is 1.2 * 10
5W/(m
2.k); Critical thermal load is 1.4 * 10
6W/m
2; Under 0.2～0.3 ℃ the temperature difference, just produce boiling.Strengthening effect than the identical device made from stainless steel is multiplied again.
Claims (7)
1, strengthening heat transfer element and manufacture method.It is characterized in that at the metal tube of unlike material or the surfaces externally and internally of plate (or one side), with press welding method under certain operational parameters, with unlike material, the woven wire (single or multiple lift) of different manufacture methods under the condition that guarantees aperture and porosity with pipe or firm and hard existing firm combining, constitute metal composite mesh on two surfaces intensify heat transfer pipe and heat transfer plate.
2, according to the metal tube or the plate of said unlike material in the claim 1, it is characterized in that referring to copper, aluminium, silver, nickel, titanium and alloy thereof, carbon steel, stainless steel etc.
3,, it is characterized in that on special welding machine, realizing its operating parameter, wherein according to said press welding method and certain operational parameters thereof in the claim 1
Welding temperature: 400～1800 ℃, (directly relevant) with material
Welding pressure: 1～110MPa,
Weld interval: 1～60 minute,
Welding vacuum: 10～10
-5Pa,
Inert gas protection pressure: 0.03～0.6MPa.
4, according to said unlike material in the claim 1, the woven wire of different manufacture methods is characterized in that referring to adopt copper, aluminium, silver, nickel, titanium and alloy thereof, carbon steel, the plain weave of the different meshes (mesh) that metal wire knitted such as stainless steel become, woven wires such as twill, Seats type line.
5, according to said aperture and porosity in the claim 1, it is characterized in that referring to individual layer composite web average pore size greater than 5 microns, average thickness is greater than 0.05 millimeter, and mean porosities is 45～75%.
6,, it is characterized in that promptly available seamless pipe moulding also can be adopted the moulding of composite web augmentation of heat transfer soil weld under the condition that guarantees aperture and porosity according to said composite web intensify heat transfer pipe in the claim 1.
7,, it is characterized in that employed material can match arbitrarily as required according to said composite web intensify heat transfer pipe and heat transfer plate in the claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91100831 CN1028900C (en) | 1991-02-13 | 1991-02-13 | Heat transmitting tubes and plates reinforced with metal mesh at both inner and outer surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91100831 CN1028900C (en) | 1991-02-13 | 1991-02-13 | Heat transmitting tubes and plates reinforced with metal mesh at both inner and outer surfaces |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93112899 Division CN1033628C (en) | 1993-12-22 | 1993-12-22 | Method for mfg. reinforced heat-transfer tube and heat-transfer plate with copper composite mesh on two surfaces |
| CN 93112898 Division CN1033627C (en) | 1993-12-22 | 1993-12-22 | Method for mfg. reinforced heat-transfer tube and heat-transfer plate with aluminium composite mesh on two surfaces |
| CN 93112897 Division CN1033626C (en) | 1993-12-22 | 1993-12-22 | Method for mfg. reinforced heat-transfer tube and heat-transfer plate with titanium composite mesh on two surfaces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1053119A true CN1053119A (en) | 1991-07-17 |
| CN1028900C CN1028900C (en) | 1995-06-14 |
Family
ID=4904850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91100831 Expired - Fee Related CN1028900C (en) | 1991-02-13 | 1991-02-13 | Heat transmitting tubes and plates reinforced with metal mesh at both inner and outer surfaces |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1028900C (en) |
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|---|---|---|---|---|
| CN101195186B (en) * | 2006-12-05 | 2010-06-30 | 王强 | Heat exchanger aluminum pipe brazing flame shunting net and method of aluminum pipe brazing by using the shunting net |
| CN102152072A (en) * | 2011-02-25 | 2011-08-17 | 天津商业大学 | Method for machining porous-surface heat-exchange pipe for boiling heat-transfer equipment |
| CN102285646A (en) * | 2011-06-17 | 2011-12-21 | 中国海洋石油总公司 | Heat tube type sulfur melting slot and special heat tube thereof |
| CN103567624A (en) * | 2013-11-05 | 2014-02-12 | 南京三乐电子信息产业集团有限公司 | Welding method for composite cavity sheets of high-power coupled-cavity traveling-wave tube |
| CN104228185A (en) * | 2014-07-16 | 2014-12-24 | 华南理工大学 | Method for firmly compounding filament material on surface of metal |
| WO2017107191A1 (en) * | 2015-12-25 | 2017-06-29 | Kechuang Lin | Heat exchange material, apparatus and system |
| CN108267026A (en) * | 2018-02-28 | 2018-07-10 | 杭州众盛新科技有限公司 | A kind of efficient condenser |
| CN108278919A (en) * | 2017-11-11 | 2018-07-13 | 杭州众盛新科技有限公司 | A kind of efficient heat-exchanging pipe |
| CN108398033A (en) * | 2018-02-28 | 2018-08-14 | 杭州众盛新科技有限公司 | A kind of VOCS processing condenser |
| CN112397245A (en) * | 2020-09-29 | 2021-02-23 | 广东电网有限责任公司 | Cable filler thermochromism color development device capable of developing color more quickly |
-
1991
- 1991-02-13 CN CN 91100831 patent/CN1028900C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195186B (en) * | 2006-12-05 | 2010-06-30 | 王强 | Heat exchanger aluminum pipe brazing flame shunting net and method of aluminum pipe brazing by using the shunting net |
| CN102152072A (en) * | 2011-02-25 | 2011-08-17 | 天津商业大学 | Method for machining porous-surface heat-exchange pipe for boiling heat-transfer equipment |
| CN102152072B (en) * | 2011-02-25 | 2012-11-07 | 天津商业大学 | Method for machining porous-surface heat-exchange pipe for boiling heat-transfer equipment |
| CN102285646A (en) * | 2011-06-17 | 2011-12-21 | 中国海洋石油总公司 | Heat tube type sulfur melting slot and special heat tube thereof |
| CN102285646B (en) * | 2011-06-17 | 2013-08-21 | 中国海洋石油总公司 | Heat tube type sulfur melting slot and special heat tube thereof |
| CN103567624B (en) * | 2013-11-05 | 2015-08-05 | 南京三乐电子信息产业集团有限公司 | The welding method of the Compound Cavity sheet of high-power coupled-cavity TWT |
| CN103567624A (en) * | 2013-11-05 | 2014-02-12 | 南京三乐电子信息产业集团有限公司 | Welding method for composite cavity sheets of high-power coupled-cavity traveling-wave tube |
| CN104228185A (en) * | 2014-07-16 | 2014-12-24 | 华南理工大学 | Method for firmly compounding filament material on surface of metal |
| WO2017107191A1 (en) * | 2015-12-25 | 2017-06-29 | Kechuang Lin | Heat exchange material, apparatus and system |
| CN108278919A (en) * | 2017-11-11 | 2018-07-13 | 杭州众盛新科技有限公司 | A kind of efficient heat-exchanging pipe |
| CN108267026A (en) * | 2018-02-28 | 2018-07-10 | 杭州众盛新科技有限公司 | A kind of efficient condenser |
| CN108398033A (en) * | 2018-02-28 | 2018-08-14 | 杭州众盛新科技有限公司 | A kind of VOCS processing condenser |
| CN112397245A (en) * | 2020-09-29 | 2021-02-23 | 广东电网有限责任公司 | Cable filler thermochromism color development device capable of developing color more quickly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1028900C (en) | 1995-06-14 |
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