CN101793474A - Outer vertical cannelure internal sintering type metal porous layer two-sided strengthened heat exchange tube - Google Patents
Outer vertical cannelure internal sintering type metal porous layer two-sided strengthened heat exchange tube Download PDFInfo
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- CN101793474A CN101793474A CN201010105190A CN201010105190A CN101793474A CN 101793474 A CN101793474 A CN 101793474A CN 201010105190 A CN201010105190 A CN 201010105190A CN 201010105190 A CN201010105190 A CN 201010105190A CN 101793474 A CN101793474 A CN 101793474A
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Abstract
The invention relates to an outer vertical cannelure internal sintering type metal porous layer two-sided strengthened heat exchange tube. The heat exchange tube comprises a middle two-sided strengthened heat exchange segment and smooth tube joint segments at both ends, wherein the outer surface of the two-sided strengthened heat exchange segment is a vertical cannelure surface layer, and the inner surface is a metal porous surface layer. Compared with the prior art, the invention can strengthen external tube condensation heat transfer and internal tube boiling heat transfer simultaneously, and at the outside of the tube, a liquid film is scarified by a protruding part of the cannelure top via increasing the heat exchange area, and then condensate is brought to the bottom of the cannelure by the surface tension of the liquid and is discharged along a channel at the bottom of the cannelure, so the thickness of the liquid film can be reduced, the heat transfer efficiency is increased, the condensation heat exchange coefficient is increased by 3 to 5 times, the boiling heat exchange efficiency in the tube can be increased by one order of magnitude by the method of increasing boiling nucleuses, the strengthening effects inside and outside the tube are both very obvious, and the heat exchange tube belongs to the two-sided strengthened heat exchange tube, which can greatly reduce the heat exchange area and volume of a heat exchanger.
Description
Technical field
The present invention relates to a kind of heat exchanger tube, particularly relate to a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell, is to the improvement of existing thermoexcell, belongs to the enhanced heat exchange Element Technology.
Background technology
The augmentation of heat transfer technology has been widely used in the heat exchanger of industries such as petrochemical industry, electric power, metallurgy at present, but mostly based on the single face reinforcement, because heat-transfer effect is decided by the common influence of both sides, so the single face reinforcement technique can not increase substantially the heat exchange efficiency of whole heat exchanger tube.Heat exchange tube with two reinforced surfaces and high-performance heat exchanger thereof are with a wide range of applications with its excellent heat transfer property, thereby have the enormous and latent market demand.At present that is that all right is ripe about the technical research of such heat exchanger tube.
For example publication number is the Chinese patent " petal-shaped spiral pod pipe " of CN2556587, the radius of curvature R at groove line peak
1Radius of curvature R greater than groove line paddy
2, R
1Be 1～3mm, 1.5＜R
1/ R
2＜2.5, the degree of depth of groove line paddy is between 1.0～1.1mm, spiral cannelure line and body axis angle α are 5～15 °, though this technology strengthens the outer liquid film horse traction dagger-axe Buddhist nun effect of pipe, and the disturbance aggravation, heat and mass transfer performance improves significantly, but, opposite side is not optimized, so have a greatly reduced quality by the total heat transfer efficiency of the heat exchanger of its manufacturing because it has strengthened the heat transfer of condensation side, the augmentation of heat transfer effect is also not obvious, and the value of practical application is little.
For example publication number is the Chinese invention patent " porous surface metal high flux heat exchanger tube " of CN1730204A, it directly is sprayed onto the metal heat exchange pipe external surface by flame gun after with metal powders melt, form metal porous laminar surface, its boiling heat transfer coefficient is 3～8 times of light pipe.Defectives such as but its preparation technology is comparatively complicated, and the metal dust waste is serious, and the porous layer of its formation simultaneously exists porosity lower, and it is insecure to bond have limited this The Application of Technology.
All there is certain defective in the technology of above patent disclosure, and therefore, it is extremely urgent to research and develop out the two-sided strengthened heat-transfer matcrial with independent intellectual property right.The purpose of patent of the present invention is exactly to overcome the deficiency that prior art exists, and whitewashes technology by change, improves porous layer and high base strength and production efficiency.By sintered porous layer and vertical cannelure surface is organic compound, prepare the high and widely used heat exchange tube with two reinforced surfaces of a kind of heat transfer coefficient.
This slug type surface has the inner concave shape hole, and inside interconnects, because lip-deep hole has formed a lot of nucleate points, greatly reduce the required overtemperature of liquid boiling vaporization, enhanced boiling heat transfer reduces required heat exchange area significantly, boiling heat transfer coefficient is brought up to 9～10 times of smooth surface, simultaneously owing to can not form the phenomenon that local concentration increases, thus its hole be difficult for stopping up because of fouling or crystallization, thereby enhanced boiling heat transfer that can long-term stability.
Mainly by special rolling mill processing, the reason of this heat exchange surface enforcing condensation is on this vertical cannelure surface: (1) increases the condensing heat-exchange area; (2) condensate film thickness on the attenuate tube wall; (3) aggravation fluid turbulent intensity.The out-tubular condensing coefficient of heat transfer is brought up to 3～5 times of smooth surface like this.
Summary of the invention
Purpose of the present invention is exactly the outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell that a kind of enhanced boiling heat transfer simultaneously and condensation heat transfer are provided for the defective that overcomes existing common intensify heat transfer pipe existence.
Purpose of the present invention can be achieved through the following technical solutions: a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell, this heat exchanger tube includes middle double surface strengthening heat exchanging segment and two ends plain tube junction, it is characterized in that, the outer surface of described two-sided strengthened heat exchanging segment is the vertical cannelure superficial layer, and inner surface is a porous surface metal.
It is 10～100 that the groove of described vertical cannelure superficial layer is counted n, and groove width is 0.2～1.5mm, and groove depth e is 0.5～1.5mm, groove peak and bottom land radius of curvature (R
1And R
2) be 0.2～1.5mm, the thick w of diapire is 0.5～3.8mm.
Described vertical cannelure superficial layer is to adopt milling train to process at the plain tube outer surface.
The material of described vertical cannelure superficial layer comprises copper alloy, carbon steel or stainless steel.
The specification of described plain tube is φ (15～40) * (2～5) * (500～12000) mm.
The thickness of described porous surface metal layer is 0.1～1mm, and porosity is 50～85%, and the aperture is 30～150 μ m.
Described porous surface metal layer is that the mixed slurry with metal dust and binding agent sprays to the plain tube inwall, forms at 700～1100 ℃ of following sintering then.
The weight ratio of described metal dust and binding agent is 10: (1～5), described metal dust comprises iron alloy powder or copper alloy powder, and described binding agent comprises polypropylene, polyethylene, polystyrene, PETG, polymethylacrylic acid and dimethylbenzene.
The processing method of described vertical cannelure superficial layer adopts multiple tooth rolling system on special rolling mill, adopt the method for adding excellent core to prevent pipe deformation.Described porous surface metal layer adopts directly with a certain proportion of metal dust and binding agent furnishing slip, be sprayed directly into the method on plain tube surface then, it is tightr and even that the method can make metal dust contact with matrix, more firm behind the sintering with bond matrix, improved production efficiency simultaneously.By add assistant activator in metal dust, the porosity of control porous layer reduces sintering temperature simultaneously.
The preparation method of heat exchange tube with two reinforced surfaces of the present invention processes earlier the outer surface vertical cannelure on plain tube, then at plain tube inner surface spraying slip and dry, in high temperature sintering furnace, carry out sintering (700～1100 ℃) then, come out of the stove after the cooling, promptly prepare heat exchange tube with two reinforced surfaces.
Heat exchanger tube of the present invention enhanced tube condensed exterior simultaneously conducts heat and the boiling in ducts heat transfer, pipe is outer by increasing heat exchange area, play part by the groove rostellum and scratch liquid film, utilize surface tension of liquid to take the condensate liquid on groove top to bottom land then, drain along the bottom land passage then, like this can the reducer film thickness, improve heat transfer efficiency, make the condensing heat-exchange coefficient improve 3～5 times, can make boiling heat transfer efficient improve about 10 times by the method that increases the nucleus of boiling in the pipe, in the pipe, outer strengthening effect is all very remarkable, belongs to heat exchange tube with two reinforced surfaces, can reduce the heat exchange area and the volume of heat exchanger significantly.
Description of drawings
Fig. 1 is the profile of the outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell of the present invention;
Fig. 2 is the schematic partial cross-sectional view of the outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell of the present invention.
Wherein: the 1-plain tube, 2-vertical cannelure superficial layer, 3-porous surface metal layer, the w-diapire is thick, e-groove depth, n-groove number, R
1-groove top radius, R
2-bottom radius.
The specific embodiment
The present invention is described in detail below in conjunction with accompanying drawing and instantiation.
Embodiment 1
Be that the specification of processing tube outer vertical cannelure superficial layer 2 is that groove is counted n=50 on the red copper light pipe matrix plain tube 1 of φ 32 * 3 * 1000mm in specification, the thick w=2.5mm of diapire, groove depth e=0.8mm, groove width 0.6mm, in the condensation heat transfer experiment that with the cold-producing medium is medium, condensation coefficient can improve 3.5 times.The specification of pipe internal sintering type metal porous surface layer 3 is: porous bed thickness 0.2mm, equivalent aperture 70 μ m, porosity 75% is being in the boiling heat transfer experiment of medium with ethanol, boiling heat transfer coefficient can reach 10 times of plain tube, and the overall heat-transfer coefficient of single heat exchange tube can improve about 3 times.
Embodiment 2
The specification that in specification is the pipe outer vertical cannelure processed on the carbon steel pipe basis of φ 22 * 2 * 3000mm is that groove is counted n=30, the thick w=1.4mm of diapire, groove depth e=0.7mm, groove width 0.2mm, in the condensation heat transfer experiment that with the cold-producing medium is medium, condensation coefficient can improve 4 times.The specification of pipe internal sintering type porous layer heat exchanger tube is, porous bed thickness 0.25mm, and equivalent aperture 40 μ m, porosity 65% is being in the boiling heat transfer experiment of medium with acetone, boiling heat transfer coefficient can reach 8 times of plain tube.The overall heat-transfer coefficient of whole heat exchanger tube can improve 2.5 times.
Embodiment 3
A kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell, this heat exchanger tube includes middle double surface strengthening heat exchanging segment and two ends plain tube junction, the outer surface of described two-sided strengthened heat exchanging segment is the vertical cannelure superficial layer, and inner surface is a porous surface metal.
Described vertical cannelure superficial layer is the outer surface employing milling train processing at stainless steel plain tube interlude, stainless steel plain tube two ends are exposed and are junction, the specification of stainless steel plain tube is φ 40 * 4 * 12000mm, the specification of vertical cannelure superficial layer is: groove is counted n=100, groove width 1.5mm, groove depth e=1.6mm, groove peak and bottom land radius of curvature (R
1And R
2) be 1.5mm, the thick w=2.5mm of diapire; The thickness of described porous surface metal layer is 1mm, porosity is 80%, the aperture is 150 μ m, and described porous surface metal layer is to be that 10: 1 the iron alloy powder and the mixed slurry of polypropylene adhesive spray to the matrix inwall with weight ratio, forms at 1100 ℃ of following sintering then.
The preparation method of described heat exchange tube with two reinforced surfaces processes earlier the outer surface vertical cannelure on plain tube, then at plain tube inner surface spraying slip and dry, in high temperature sintering furnace, carry out sintering then, come out of the stove after the cooling, promptly prepare heat exchange tube with two reinforced surfaces.
Embodiment 4
A kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell, this heat exchanger tube includes middle double surface strengthening heat exchanging segment and two ends plain tube junction, the outer surface of described two-sided strengthened heat exchanging segment is the vertical cannelure superficial layer, and inner surface is a porous surface metal.
Described vertical cannelure superficial layer is the outer surface employing milling train processing at stainless steel plain tube interlude, stainless steel plain tube two ends are exposed and are junction, the specification of stainless steel plain tube is φ 15 * 2 * 500mm, the specification of vertical cannelure superficial layer is: groove is counted n=10, groove width 0.2mm, groove depth e=1.5mm, groove peak and bottom land radius of curvature (R
1And R
2) be 0.5mm, the thick w=0.5mm of diapire; The thickness of described porous surface metal layer is 0.1mm, porosity is 50%, the aperture is 30 μ m, and described porous surface metal layer is to be that 10: 1 the copper alloy powder and the mixed slurry of polyethylene binder spray to the matrix inwall with weight ratio, forms at 700 ℃ of following sintering then.
The preparation method of described heat exchange tube with two reinforced surfaces processes earlier the outer surface vertical cannelure on plain tube, then at plain tube inner surface spraying slip and dry, in high temperature sintering furnace, carry out sintering then, come out of the stove after the cooling, promptly prepare heat exchange tube with two reinforced surfaces.
Embodiment 5
A kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell, this heat exchanger tube includes middle double surface strengthening heat exchanging segment and two ends plain tube junction, the outer surface of described two-sided strengthened heat exchanging segment is the vertical cannelure superficial layer, and inner surface is a porous surface metal.
Described vertical cannelure superficial layer is the outer surface employing milling train processing at stainless steel plain tube interlude, stainless steel plain tube two ends are exposed and are junction, the specification of stainless steel plain tube is φ 20 * 4 * 10000mm, the specification of vertical cannelure superficial layer is: groove is counted n=80, groove width 1.3mm, groove depth e=1.0mm, groove peak and bottom land radius of curvature (R
1And R
2) be 1.0mm, the thick w=3.0mm of diapire; The thickness of described porous surface metal layer is 0.2mm, porosity is 85%, the aperture is 100 μ m, and described porous surface metal layer is to be that 10: 3 the copper alloy powder and the mixed slurry of poly terephthalic acid binding agent spray to the matrix inwall with weight ratio, forms at 900 ℃ of following sintering then.
The preparation method of described heat exchange tube with two reinforced surfaces processes earlier the outer surface vertical cannelure on plain tube, then at plain tube inner surface spraying slip and dry, in high temperature sintering furnace, carry out sintering then, come out of the stove after the cooling, promptly prepare heat exchange tube with two reinforced surfaces.
Claims (8)
1. outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell, this heat exchanger tube includes middle double surface strengthening heat exchanging segment and two ends plain tube junction, it is characterized in that the outer surface of described two-sided strengthened heat exchanging segment is the vertical cannelure surface, inner surface is a porous surface metal.
2. a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell according to claim 1, it is characterized in that it is 10～100 that the groove of described vertical cannelure superficial layer is counted n, groove width is 0.2～1.5mm, groove depth e is 0.5～1.5mm, groove peak and bottom land radius of curvature (R
1And R
2) be 0.2～1.5mm, the thick w of diapire is 0.5～3.8mm.
3. a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell according to claim 1 and 2 is characterized in that, described vertical cannelure superficial layer is to adopt milling train to process at the plain tube outer surface.
4. a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell according to claim 3 is characterized in that the material of described vertical cannelure superficial layer comprises copper alloy, carbon steel or stainless steel.
5. a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell according to claim 3 is characterized in that, the specification of described plain tube is φ (15～40) * (2～5) * (500～12000) mm.
6. a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell according to claim 1 is characterized in that the thickness of described porous surface metal layer is 0.1～1mm, and porosity is 50～85%, and the aperture is 30～150 μ m.
7. a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell according to claim 1, it is characterized in that, described porous surface metal layer is that the mixed slurry with metal dust and binding agent sprays to the plain tube inwall, forms at 700～1100 ℃ of following sintering then.
8. a kind of outer vertical cannelure internal sintering type metal porous layer two-sided thermoexcell according to claim 7, it is characterized in that, the weight ratio of described metal dust and binding agent is 10: (1～5), described metal dust comprises iron alloy powder or copper alloy powder, and described binding agent comprises polypropylene, polyethylene, polystyrene, PETG, polymethylacrylic acid and dimethylbenzene.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010105190A CN101793474A (en) | 2010-02-03 | 2010-02-03 | Outer vertical cannelure internal sintering type metal porous layer two-sided strengthened heat exchange tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010105190A CN101793474A (en) | 2010-02-03 | 2010-02-03 | Outer vertical cannelure internal sintering type metal porous layer two-sided strengthened heat exchange tube |
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| CN101793474A true CN101793474A (en) | 2010-08-04 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975522A (en) * | 2010-11-09 | 2011-02-16 | 上海化工研究院 | High-efficient heat exchanger |
| CN102829667A (en) * | 2012-09-11 | 2012-12-19 | 天津大学 | Foam metal heat exchange tube |
| CN105806132A (en) * | 2014-12-31 | 2016-07-27 | 江苏信换热器科技有限公司 | Aluminum powder porous layer manufacturing technology and aluminum high-throughput pipe applying porous layer |
| EP3067653A4 (en) * | 2013-11-06 | 2016-11-16 | Sumitomo Electric Industries | Metal tube, heat transfer tube, heat exchange device, and method for manufacturing metal tube |
| CN106440912A (en) * | 2015-08-07 | 2017-02-22 | 江苏信换热器科技有限公司 | Stainless steel high throughput pipe and manufacturing process thereof |
| CN107168493A (en) * | 2017-06-01 | 2017-09-15 | 曙光节能技术（北京）股份有限公司 | A kind of CPU heat dissipating methods and device |
| CN112648867A (en) * | 2020-11-30 | 2021-04-13 | 合肥通用机械研究院有限公司 | Integrated diffusion welding heat exchanger for enhancing heat transfer |
-
2010
- 2010-02-03 CN CN201010105190A patent/CN101793474A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975522A (en) * | 2010-11-09 | 2011-02-16 | 上海化工研究院 | High-efficient heat exchanger |
| CN102829667A (en) * | 2012-09-11 | 2012-12-19 | 天津大学 | Foam metal heat exchange tube |
| EP3067653A4 (en) * | 2013-11-06 | 2016-11-16 | Sumitomo Electric Industries | Metal tube, heat transfer tube, heat exchange device, and method for manufacturing metal tube |
| CN105806132A (en) * | 2014-12-31 | 2016-07-27 | 江苏信换热器科技有限公司 | Aluminum powder porous layer manufacturing technology and aluminum high-throughput pipe applying porous layer |
| CN106440912A (en) * | 2015-08-07 | 2017-02-22 | 江苏信换热器科技有限公司 | Stainless steel high throughput pipe and manufacturing process thereof |
| CN107168493A (en) * | 2017-06-01 | 2017-09-15 | 曙光节能技术（北京）股份有限公司 | A kind of CPU heat dissipating methods and device |
| CN112648867A (en) * | 2020-11-30 | 2021-04-13 | 合肥通用机械研究院有限公司 | Integrated diffusion welding heat exchanger for enhancing heat transfer |
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Open date: 20100804 |