CN104236369B - Inner spiral outer crossed tunnel double-side reinforced boiling heat transfer pipe - Google Patents
Inner spiral outer crossed tunnel double-side reinforced boiling heat transfer pipe Download PDFInfo
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- CN104236369B CN104236369B CN201410467011.0A CN201410467011A CN104236369B CN 104236369 B CN104236369 B CN 104236369B CN 201410467011 A CN201410467011 A CN 201410467011A CN 104236369 B CN104236369 B CN 104236369B
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Abstract
The invention provides an inner spiral outer crossed tunnel double-side reinforced boiling heat transfer pipe, which comprises a heat transfer pipe base body, wherein an inner spiral groove is formed in the inner surface of the heat transfer pipe base body and is in spiral distribution along the inner surface, a spiral axial line is coaxial with the axial line of the heat transfer pipe, a plurality of rib sheets in spiral distribution are arranged on the outer surface of the heat pipe base body along a pipe axis and are mutually independent, and a three-dimensional expansion curve surface of the outer surface of the whole heat transfer pipe wall is formed. The inner spiral outer crossed tunnel double-side reinforced boiling heat transfer pipe has the advantages that the heat transfer area can be greatly increased, the viscous flow edge layer can also be damaged by the rib sheets, and the boiling heat transfer film coefficient can be improved; the secondary separation flow can be induced through the spiral grooves distributed in the pipe, the liquid turbulence degree in the pipe can be improved, the convection heat transfer film coefficient in the pipe can be improved, and in addition, a certain scale-resistant capability is realized. The inner spiral outer crossed tunnel double-side reinforced boiling heat transfer pipe is applicable to the heat exchange of low-viscosity liquid containing certain impurities in a reinforced pipe and high-viscosity and high-boiling-point liquid outside the pipe, particularly liquid organic compounds.
Description
Technical field
The present invention relates to a kind of augmentation of heat transfer pipe is and in particular to one kind can increase substantially the outer boiling heat transfer of pipe and pipe simultaneously
Interior convection heat transfer' heat-transfer by convection film coefficient, and there is the two-sided strengthened boiling heat transfer pipe in internal coiling external chiasma tunnel of certain enhanced fouling resistance.
Background technology
Shell-and-tube heat exchanger is a kind of heat exchanger being most widely used at present, is widely used in energy source and power, oil
The industrial circles such as work, pharmacy, metallurgy, the ratio that its investment accounts for total equipment investment can reach more than 35%, thus is passed using strengthening
Pyrogen reason is designed to shell-and-tube heat exchanger, improves the key just becoming energy-conservation, improving utilization rate of equipment and installations and availability.Its
In, design the basic heat exchange element of efficient heat-transfer pipe shell-and-tube heat exchanger, be the master realizing heat exchanger high efficient heat exchanging
Want approach.
The outer boiling heat transfer of enhanced tube can take different measures, wherein for the various factors of impact boiling heat transfer efficiency
More generally change heat-transfer pipe heating surface roughened state (Cheng Lixin, Chen Tingkuan. boiling heat transfer reinforcement technique and method
[J]. chemical equipment technology, 1999,20 (1)：30-34), to form more nucleus of boiling, increase the probability that bubble produces, reach
Effect to enhanced boiling heat transfer.Based on this theory, a collection of new and effective augmentation of heat transfer pipe is developed, and has
Applied for patent, such as now more typically have porous surface heat-exchanging tube, T-shaped finned tube and low fin tube.Every kind of augmentation of heat transfer pipe is all
There is corresponding enhanced heat transfer mechanism, and have its corresponding range of application.Porous surface heat-exchanging tube (Liao Lihua, Dong Qingbo,
Shen Chuanwen, Bai Eryi, Wang Zhijuan. the research of aluminum porous surface heat-exchanging tube enhanced boiling heat transfer and its commercial Application [J]. chemical industry fills
Standby technology, 2003,24 (1)：It is 27-30) to cover metal dust porous layer on heating surface surface, compared with plain tube, its boiling
Film coefficient of heat transfer can increase 5～6 times, but such heat exchange tube machining technique is complicated, and relatively costly, the investment of heat exchanger is compared with light
Slip pipe is also significantly increased.T-shaped finned tube (Luo Guoqin, Lu Yingsheng, Zhuan Lixian, Deng Song nine .T shape finned tube boiling heat transfer
The research [J] of characteristic. colleges and universities' Chemical Engineering journal, 1989,3 (2)：56-62) compared with plain tube, its boiling heat transfer coefficient
It is obviously improved with critical thermal load, and processes extremely easy, but T-shaped finned tube initiates boiling stage and there is serious boiling
Rise hysteresis, the presence of this hysteresis leverages the performance of its strengthening performance.Low fin tube structure is simple, easy processing,
Its boiling heat transfer film coefficient is higher than plain tube but is less than T-shaped finned tube[3], and different condition is issued to the optimal pipe strengthening effect
Geometric parameter often different (Dong Jing, Zhang Hongji, Cheng Junguo. low help the impact to boiling heat transfer for the pipe geometric parameter and its optimization
[J]. University Of Chongqing's journal, 1990,13 (1)：35-41), this brings very big inconvenience to practical application.Above-mentioned several heat-transfer pipe
All there are certain effect, especially T-shaped finned tube to improving the outer boiling heat transfer coefficient of pipe, its heat transfer property approaches or even super
Cross the level of E pipe.But they are only capable of accomplishing unilateral augmentation of heat transfer outside pipe, exist and are unable to convective heat-transfer coefficient in enhanced tube
The deficiency of aspect, this also limit their commercial Application in some aspects to a certain extent, such as manage in for low-viscosity (mobile) liquid,
It is the heat exchange place between high viscosity, high boiling liquid outside pipe.
Content of the invention
It is an object of the invention to avoid referring in above-mentioned background technology in some places, the deficiency of existing heat-transfer pipe,
And provide a kind of internal coiling external chiasma tunnel two-sided strengthened boiling heat transfer pipe, the outer boiling heat transfer of pipe and pipe can be increased substantially simultaneously
Interior convection heat transfer' heat-transfer by convection film coefficient, and there is the two-sided strengthened heat-transfer pipe of certain enhanced fouling resistance, directly meet current and futuristic design
Design requirement for high viscosity, high boiling point heat transfer tube in heat exchanger.
The purpose of the present invention is realized at least through one of following technical scheme.
A kind of two-sided strengthened boiling heat transfer pipe in internal coiling external chiasma tunnel, including heat-transfer pipe matrix, table in heat-transfer pipe matrix
Face is provided with inter-spiral groove, and inter-spiral groove is distributed in the shape of a spiral along inner surface, the axis of screw and heat-transfer pipe axis coaxle；Heat pipe
Outer surface of matrix is provided with the multiple fins becoming Spiral distribution along pipe axle；Described fin independently of one another, constitutes the whole tube wall that conducts heat
The three-dimensional extended curved surface of outer surface；Described inter-spiral groove, fin and heat-transfer pipe matrix are integrated, contactless heat
Resistance.
Further optimal enforcement, the fin of described heat-transfer pipe outer surface of matrix is the left-handed bow by from the beginning of end surfaces
Tee section spiral grooves and dextrorotation bow-shaped cross-section spiral grooves intersect nature molding, and the axial spacing of fin is 30～
50mm, fin height is 3.0～8.0mm.
Further optimal enforcement, the inter-spiral groove of described heat-transfer pipe base inner surface is left-handed or dextrorotation, groove
The value of helixangleθ is 65 °～85 °, and its helical pitch is pitch d is 15～25mm, groove depth b=1.5mm～4.5mm.
Further optimal enforcement, the pitch of left-handed bow-shaped cross-section spiral grooves forming described fin is cut with dextrorotation arch
The pitch of surface helix groove is equal or unequal, the pitch c=30～50mm of bow-shaped cross-section spiral grooves,
Diameter of phi=4.0 of bow-shaped cross-section～10mm, bow-shaped cross-section spiral goove groove depth e=3.0～8mm.
Further optimal enforcement, described fin overall volume is equal or unequal, but the height of fin is equal,
The height h of fin is identical with bow-shaped cross-section spiral goove groove depth e.
Further optimal enforcement, the axial cross section shape of described heat-transfer pipe matrix inter-spiral groove is semicircle, falls
One of triangle.
Further optimal enforcement, described fin is vertical with pipe outer wall face, and the angle with pipe axis is 75 °～88 °, and
Curl arrangement in the axial direction.
Further optimal enforcement, the material of heat-transfer pipe includes pyrite, red copper, soft aluminum or mild alloy material.
Preferably, the outer fin of described pipe is integrated with pipe matrix, contactless thermal resistance.And manage between outer fin
Separate, along the distribution of outer surface of matrix curl and vertical with pipe outer wall face, the angle with pipe axis is 75 °～88 °,
Thus forming complete three-dimensional extended curved surface in outer surface of tube wall.The gap left between separate fin forms and intersects tunnel
Road space, the height of each fin is identical with bow-shaped cross-section spiral goove groove depth, is 3.0mm～8.0mm.This structure can be significantly
Improve boiling heat transfer surface area, and the height of described fin is higher, fin external surface area is bigger, and boiling heat transfer performance is got over
Good.In addition, the clearance gap between described fin is adjustable, can be for different operating modes, and different heat-transfer fluid viscositys is adjusted
Section arrange parameter, has given play to surface tension of liquid effect to a greater degree, strengthens liquid phase shearing force to heat-transfer pipe upstream body fluid
The turbulence effect of film, augmentation of heat transfer effect.It is secondary that the spiral grooves of this structure can induce spiral flow and boundary layer separation flow etc.
Stream, while increasing substantially convection heat transfer' heat-transfer by convection film coefficient in pipe, also has the ability of certain ant-scaling.
Described pipe inter-spiral groove, its rotation direction can be left-handed or be dextrorotation, and the value of the helixangleθ of groove is
65 °～85 °, its helical pitch (or pitch) d is 15～25mm, groove depth b=1.5mm～4.5mm.
Heat-transfer pipe main material can be selected for other non-ferrous metals such as pyrite, red copper, soft aluminum or mild alloy material.
The main more excellent enforcement parameter of the present invention is as follows：
Heat-transfer pipe outer tube diameter D：100～200mm
Pipe thickness δ：10～20mm
Indent arch left hand thread pitch angle alpha：75 °～88 °
Indent arch right-handed thread helixangleβ：95 °～110 °
The helixangleθ of spiral grooves：65 °～85 °
Helical pitch (or pitch) d of inner surface spiral grooves：15～25mm
The diameter of phi of bow-shaped cross-section：4.0～10mm
Bow-shaped cross-section spiral goove groove depth e：3.0～8mm.
The height h of fin：Identical with bow-shaped cross-section spiral goove groove depth e
Pitch c of bow-shaped cross-section spiral grooves：30～50mm
Groove depth b of inner surface spiral grooves：1.5～4.5mm.
The principle of the present invention and effect are as follows：
Outside enhanced tube of the present invention, the mechanism of boiling heat transfer is：Manage outer liquid to be heated by liquid in pipe, in boiling process,
Certain temperature difference is existed on the curved surface direction of described fin, this temperature difference will cause the interior liquid of two fins to form free convection.
The curved surface of fin provides steam bubble nuclearing centre simultaneously, promotes steam bubble nucleation and grows up, when the steam bubble producing on the curved surface of fin is long
Big to a certain extent after, heating curved surface will be departed from, float from inside to outside, then rupture.This class behavior not only disturbance of steam bubble
It is close to the thin layer liquid of curved surface, exacerbate the bulk convection turbulence of liquid simultaneously.In addition, becoming spiral outside pipe of the present invention vertically
The rib structure of shape distribution also limit the effusion of the steam bubble producing in pipe outer tunnel so that steam bubble makees ring along tunnel wall curved surface
To motion.The chance of steam bubble and tunnel inner wall curved face contact is just strengthened, thus improving in this ring flow process
Boiling heat transfer film coefficient.
In enhanced tube of the present invention, the mechanism of convection heat transfer' heat-transfer by convection is：The spiral grooves of inside pipe wall can make a part of liquid near wall
Body produces additional spiral flowing, also makes liquid make corkscrew motion while improving flow rate of liquid, and then so that thermal resistance is reduced, in pipe
Convection heat transfer' heat-transfer by convection film coefficient is increased.Meanwhile, near wall another part liquid is acted on by spiral grooves fin, dirty in rib
Face produces reverse barometric gradient, causes secondary separation stream.This separation stream will promote liquid in pipe to occur radially to mix, and increase main flow
Body and the mixability of boundary layer flow, thus accelerating liquid is to the rate of heat transfer of wall.
In the pipe of the present invention, ant-scaling mechanism is：Inside pipe wall is provided with semicircle, the spiral grooves in del section, this spiral shell
Rotation groove can make low-viscosity (mobile) liquid in pipe under low speed or low reynolds number (Re), produce the helical flow along tube axial direction, thus
Additional separation is caused to flow, this has preferable souring to inside pipe wall, and the probability of dielectric deposition has a certain degree of subtracting
Few, fully extend the inductive phase of fine particle fouling in liquid.On the other hand, the spiral grooves in semicircle or del section
There is larger local curvature's gradient in tube axial direction, the dirty layer having been formed also can be forced again to ftracture, fall from inside pipe wall emaciated face
Get off, the additional effect separating stream of cooperation, can reach certain ant-scaling effect.
Compared with prior art, advantages of the present invention and beneficial effect are：
1st, processing and forming forms several times using no cutting rolling for the fin outside tube wall, pipe inter-spiral groove, makes fin
Continuous distribution, and integrated with pipe matrix connected, entirely without thermal contact resistance.Pipe is outer to utilize separate fin strengthening boiling to pass
Heat, strengthens heat convection using spiral grooves in pipe, so can fully take into account in pipe and the outer requirement to enhanced heat exchange of pipe.
2nd, special spiral grooves structure in pipe of the present invention can make to produce in liquid in pipe flow process additional separate stream and
Longitudinal turbulence, plays the effect scrubbing wall, makes inside pipe wall face less scaling, so that it is guaranteed that heat convection in persistently good pipe
Performance, has certain anti-tartar and antiscale efficiency.
3rd, the present invention is compared with caliber parameter identical plain tube, under boiling heat transfer operating mode, the outer boiling heat transfer of single tube
Film coefficient can improve convection heat transfer' heat-transfer by convection film coefficient in more than 200%, pipe and can improve more than 125%, and overall heat-transfer coefficient can improve 85%
More than, and the increase of tube drop is less than 5%, not fairly obvious.
4th, under same heat transfer boundary condition, heat exchange area can be made to reduce using the present invention, tubing and tube sheet, the material of cylinder, whole
Individual processing assembling man-hour correspondingly also can reduce, so that the compact conformation of heat exchanger, manufacturing cost reduce.
The present invention, as the high-effect two-sided strengthened boiling heat transfer pipe of one kind, can be widely applied to high viscosity, high boiling liquid
The occasion of boiling heat transfer.For example, manage the interior liquid using low viscosity and containing certain impurity, to the outer high viscosity of pipe, high boiling liquid
The heat exchange element of the reboiler that (especially liquid organic compound) is heated just is very suitable for adopting the present invention.
Brief description
Fig. 1 is the tomograph of embodiment heat-transfer pipe.
Fig. 2 is the partial 3 d structure chart of embodiment heat-transfer pipe.
Fig. 3 is the partial sectional view of the positive apparent direction of embodiment heat-transfer pipe.
Fig. 4 is the partial sectional view of the overlook direction of embodiment heat-transfer pipe.
Fig. 5 is a kind of axial cross-sectional views of embodiment heat-transfer pipe.
Fig. 6 is axial cross-sectional views on the direction in 90 ° with Fig. 5 visual angle for the embodiment heat-transfer pipe.
Fig. 7 is the axial view of embodiment heat-transfer pipe.
In figure：1- fin；2- heat-transfer pipe matrix；3- semi-circular cross-section inter-spiral groove；D- heat-transfer pipe external diameter；δ-thickness of pipe wall
Degree；α-pipe outer indent arch left hand thread helical angle；β-pipe outer indent arch right-handed thread helical angle；θ-pipe inter-spiral groove
Helical angle；The groove depth of b- inner surface spiral grooves；The pitch of c- bow-shaped cross-section spiral grooves；The helical pitch of d- inner surface spiral grooves
(or pitch)；The diameter of Φ-bow-shaped cross-section.E- bow-shaped cross-section spiral grooves depth.The height of h- fin.
Specific embodiment
Enforcement to invention is described further with reference to the accompanying drawings and examples, but the enforcement of the present invention and protection do not limit
In this.Hereinafter the process especially not described in detail is all that those skilled in the art can refer to prior art and carry out.
As Fig. 1 implements the tomograph of heat-transfer pipe, shown in the tomograph of this local of Fig. 2, a kind of internal coiling external chiasma
Tunnel two-sided strengthened boiling heat transfer pipe, including heat-transfer pipe matrix 2, along the fin 1 of outer surface of matrix curl distribution, along matrix
The semi-circular cross-section inter-spiral groove 3 of inner surface distribution.Wherein, the outer fin 1 of described pipe is the left-handed bow by from the beginning of end surfaces
Tee section spiral grooves and dextrorotation bow-shaped cross-section spiral grooves intersect nature molding；Described pipe inter-spiral groove be by
Left-handed or dextrorotation indent single head or multi-head spiral groove are formed.
As shown in figure 1, the lateral surface of tube wall is fin of the present invention, medial surface is spiral grooves, clear for representing
For the sake of, Fig. 2 gives the partial 3 d structure chart of the present invention, and Fig. 3 gives the present invention partial sectional view of positive apparent direction, Fig. 4
Give the partial sectional view of overlook direction of the present invention, Fig. 5, Fig. 6 give the axial section of the present invention under different visual angles direction
Schematic diagram, Fig. 7 gives the axial view of the present invention.Present invention incorporates porous surface heat-exchanging tube, T-shaped finned tube and low fin tube
Deng the advantage in terms of boiling heat transfer and convection heat transfer' heat-transfer by convection, and avoid their deficiency.
The embodiment of the present invention is in indent that tube outer surface is provided with two cross-distribution, that pitch is identical, oppositely oriented of conducting heat
Arch screw thread, indent arch screw thread cuts into the fin of many curl distributions tube outer surface, and these fins constitute pipe
Outer three-dimensional extended inner sunken face.Each fin is integrated with heat-transfer pipe outer tube wall, and with around 4 fins in trench bottom
Portion is connected, and each fin is all mutually perpendicular to (referring to Fig. 1～6) with tube wall.The height managing outer fin is higher, three-dimensional extended surface
Specific surface area bigger, it is also higher that it manages outer boiling heat transfer coefficient of intensification, but also increases the resistance of extratubal fluid simultaneously.
Therefore, each fin height can be taken as 3.0mm～8.0mm (being slightly less than bow-shaped cross-section diameter of phi), and axial spacing c=30～
50mm.
It is provided with single head or bull left-turn spiral groove or right hand helix groove (referring to Fig. 1～6) in the medial surface of heat-transfer pipe.
The depth of pipe inter-spiral groove is deeper, and helical pitch (or pitch) is less, and in its pipe, strengthening convective heat-transfer coefficient is also bigger, but simultaneously
Increased the pressure drop of tube fluid.Therefore, the helixangleθ of every spiral grooves can be taken as 65 °～85 °, helical pitch (or pitch) d
15～25mm, groove depth b=1.5mm～4.5mm can be taken as.
It is blank that the enforcement of the present invention can use plain tube, using special pipe mill and with extruding and less or no machining
Mode is carried out, pipe inter-spiral groove 3 and pipe outer fin 1 separate machined molding.
A kind of feasible processing method is that copper or aluminum plain tube are placed on special pipe mill, and by smooth pipe box
Enter in the special die of equilateral triangle arrangement, along pipe radial clamping mould, start pipe mill, the synchronously left-handed rotation of 3 molds
Turn, the mould gradually tightened up can make tube wall metal produce plastic deformation and make pipe produce left-handed and axially-movable, thus being formed
Recessed left-handed bow-shaped cross-section spiral grooves.After the completion of this operation, more again the pipe after the processing of this procedure is inserted in same
In one mould (also can be replaced into another mold), clamping mold, start pipe mill, now make 3 mold synchronization dextrorotation, can shape
The bow-shaped cross-section spiral grooves with back machine-shaping are become to intersect and oppositely oriented dextrorotation bow-shaped cross-section spiral grooves, two
A diameter of Φ in spiral grooves section.This operation completion after, by die change be outer surface for the face of cylinder roller, by premenstrual 2
Pipe after procedure processing is inserted in, clamping simultaneously swing roller, slowly pulls out pipe vertically, with the increase of amount of compression, gold
Belong to and flowing radially and axially.Processed by this 3 step, the fin (1) that just outside formable pipe, curl is distributed.Finally, will
In the special slot rolling knife insertion tube of a kind of semicircle or triangle, extruded and lacked machining, slot rolling knife passes through extruded tube
The material of medial wall can form left-turn spiral groove, if reversely rotating pipe fitting, the material by slot rolling knife extruded tube medial wall can
Form right hand helix groove, you can shape the spiral grooves surface of inside pipe wall.Through several roads manufacturing procedure above, just can will be smooth
Pipe blank processing cost is invented.
The specific example of a present invention is presented herein below, the design parameter of heat-transfer pipe is shown in Table 1.
Table 1
The outer three-dimensional extended inner sunken face of the pipe of the invention described above, it is possible to provide the nuclearing centre of steam bubble during boiling, promotes steam bubble
Nucleation is simultaneously grown up.Meanwhile, it is also beneficial to the flowing flow pattern of disturbance liquid, reduce laminar sublayer thickness and thermal resistance, thus there is height
The outer boiling heat transfer film coefficient of pipe.Furthermore, application tube rolling method produce it is ensured that manage outer fin surface, pipe septal fossula rooved face and
The structural intergrity of pipe matrix, completely eliminates the quality such as the thermal resistance increase causing because covering metal dust on heating surface surface
The drawback such as problem and shape dislocation.The present invention has the characteristics that the coefficient of heat transfer is high, big and ant-scaling is it is adaptable to strong than heating surface
Changing in pipe is low viscosity and the liquid containing certain impurity, and pipe is outer to be high viscosity, the heat exchange of high boiling liquid, can be widely applied to
The heat exchange of various high viscosity oils in the fields such as power source, petrochemical industry, to replace plain tube or low fin corrugated tubing, porous
Surface heat exchanging pipe etc..
Applicating example
Now so that chemical plant ethanol distillation is with reboiler transformation as a example：
The heat transfer efficiency of certain chemical plant bronzing slip pipe reboiler is low, leads to not ethanol is heated to the temperature of setting, shadow
Ring the normal production of ethanol distillation.Now manufacture the present invention with smooth copper, the specific example of structural parameters such as the invention described above, with
Substitute original plain tube in reboiler, undergo technological transformation.
After technological transformation, under identical operating mode, using the present invention reboiler than former plain tube reboiler total heat transfer system
Number is high by 50%～75%.This shows：When other conditions are identical, total heat transfer efficiency of the present invention is higher than plain tube.This is due to this
Fin outside invention heat-transfer pipe is along the distribution of tube wall curl, and the three-dimensional extended concave surface that this fin is formed provides second
Steam bubble nuclearing centre during alcohol boiling, simultaneously this special concave surface easily induces and separates stream, so as to reduce ethanol laminar flow
The thickness of bottom and the thermal contact resistance with pipe outer wall, and specific surface area is 3.5 times of plain tube.For ethanol, this shape
The low fin corrugated tubing of three-dimensional extended concave surface enhanced boiling heat transfer efficiency ratio of formula, porous surface heat-exchanging tube etc. are more preferably.
Claims (3)
1. the two-sided strengthened boiling heat transfer pipe in a kind of internal coiling external chiasma tunnel, including heat-transfer pipe matrix it is characterised in that heat-transfer pipe
Base inner surface is provided with inter-spiral groove, and inter-spiral groove is distributed in the shape of a spiral along inner surface, the axis of screw and heat-transfer pipe axis
Coaxially；Heat-transfer pipe outer surface of matrix is provided with the multiple fins becoming Spiral distribution along pipe axle；Described fin independently of one another, constitutes whole
The three-dimensional extended curved surface of individual heat transfer outer surface of tube wall；The fin of described heat-transfer pipe outer surface of matrix is by from the beginning of end surfaces,
Left-handed bow-shaped cross-section spiral grooves and dextrorotation bow-shaped cross-section spiral grooves intersect nature molding, and the axial spacing of fin is
30 ~ 50mm, fin height is 3.0 ~ 8.0mm；The inter-spiral groove of described heat-transfer pipe base inner surface is left-handed or dextrorotation, groove
Helixangleθ value be 65 ° ~ 85 °, its helical pitch is pitchdFor 15 ~ 25mm, groove depthb=1.5mm~4.5mm；Form described rib
The pitch of left-handed bow-shaped cross-section spiral grooves of piece is equal or unequal with the pitch of dextrorotation bow-shaped cross-section spiral grooves, and arch is cut
Pitch c=30 of surface helix groove ~ 50mm, the diameter of phi=4.0 ~ 10mm of bow-shaped cross-section, bow-shaped cross-section spiral goove groove depth e=3.0 ~
8mm；Described fin overall volume is equal or unequal, but the height of fin is equal, the height h of fin and bow-shaped cross-section spiral shell
Rotation ditch groove depth e is identical；The axial cross section shape of described heat-transfer pipe matrix inter-spiral groove is in semicircle, del
Kind；Described fin is vertical with pipe outer wall face, and the angle with pipe axis is 75 ° ~ 88 °, and curl arrangement in the axial direction.
2. the two-sided strengthened boiling heat transfer pipe in internal coiling external chiasma tunnel according to claim 1 is it is characterised in that heat-transfer pipe
Material include pyrite, red copper, soft aluminum or mild alloy material.
3. the two-sided strengthened boiling heat transfer pipe in internal coiling external chiasma tunnel according to claim 1 and 2 is it is characterised in that described
Inter-spiral groove, fin and heat-transfer pipe matrix be integrated, contactless thermal resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410467011.0A CN104236369B (en) | 2014-09-12 | 2014-09-12 | Inner spiral outer crossed tunnel double-side reinforced boiling heat transfer pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410467011.0A CN104236369B (en) | 2014-09-12 | 2014-09-12 | Inner spiral outer crossed tunnel double-side reinforced boiling heat transfer pipe |
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| CN104236369B true CN104236369B (en) | 2017-02-15 |
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| CN201885619U (en) * | 2010-12-02 | 2011-06-29 | 珠海格力电器股份有限公司 | Heat exchange tube and air conditioner heat exchanger comprising same |
| CN202442625U (en) * | 2012-02-18 | 2012-09-19 | 董斌 | Energy-saving self-cleaning pipe |
| CN204202459U (en) * | 2014-09-12 | 2015-03-11 | 华南理工大学 | Inside spin external chiasma tunnel and Double surface strengthening boiling heat transfer pipe |
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