CN103175429B - Multidirectional wave-li ke internally finned tubes - Google Patents

Multidirectional wave-li ke internally finned tubes Download PDF

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CN103175429B
CN103175429B CN201310134366.3A CN201310134366A CN103175429B CN 103175429 B CN103175429 B CN 103175429B CN 201310134366 A CN201310134366 A CN 201310134366A CN 103175429 B CN103175429 B CN 103175429B
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tube
multidirectional
fin
ripple
core pipe
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CN103175429A (en
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凌祥
柳林
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Abstract

The invention provides a kind of multidirectional wave-li ke internally finned tubes, comprise outer tube, be evenly distributed with multiple multidirectional ripple inner fin at the inner peripheral surface of outer tube; Described multidirectional ripple inner fin comprises a root, two straight walls and two bendings, and described two straight walls are distributed with multidirectional ripple, and the lines trend of the multidirectional ripple on same wall is always consistent; The inner surface soldering of described bending and described outer tube; Described straight wall is along described outer tube circumferentially extending; Described outer tube and described multidirectional ripple inner fin form multiple concurrent flow circulation passage.Multidirectional wave-li ke internally finned tubes version provided by the present invention is various, and easy-formation processing, effective heat transfer area enlarges markedly compared with light pipe, can mandatory guidance tube fluid Media flow pattern, Secondary Flow strengthens, the aggravation of horizontal flow-disturbing, turbulivity strengthen, powerful interference fluid media (medium) boundary layer, reaches the object of efficient augmentation of heat transfer, in pipe, longitudinal flow resistance is controlled simultaneously, compared with common internally finned tube, identical thermic load, resistance significantly reduces.

Description

Multidirectional wave-li ke internally finned tubes
Technical field
The present invention relates to the augmentation of heat transfer heat exchanger tube being applied to and using in the heat-exchange apparatus of the industrial circles such as oil, chemical industry, power, nuclear energy, metallurgy, refrigeration, Aero-Space, environmental protection and energy saving, particularly relate to a kind of multidirectional wave-li ke internally finned tubes.
Background technology
Energy relations economic development, national security and social stability, is human survival and the basis of the important substance needed for development.Along with the develop rapidly of modern industry, increasing to the demand of the energy, the degree of dependence of the energy is also significantly risen, and energy shortage becomes the significant bottleneck of restriction economic development.Current countries in the world all actively finding the new energy and exploitation clean energy resource, tap a new source of energy no doubt important, but economize energy are but the task of top priority.Resources for construction economizing type and friendly environment society are the fundamental state policies of China.Saving energy and reduce the cost and improving emphatically energy utilization rate is the important channel solving energy problem.The most important thing of industrial energy saving work, as basic heat transfer unit equipment---heat exchanger is widely used in the fields such as oil, chemical industry, power, nuclear energy, metallurgy, refrigeration, Aero-Space, its power consumption and equipment investment occupy sizable ratio in whole production process, and therefore improving heat exchanger performance has very important meaning to energy utilization rate.So the heat conduction reinforced technology of heat exchanger is all an important topic all the time, be subject to the attention of researcher.
Shell-and-tube heat exchanger because structure is reliable, technology maturation, widely applicable, be heat exchange structure form the most conventional in current therrmodynamic system, in current commercial plant, shell-and-tube heat exchanger accounts for 70% of whole heat exchanger.The energy-efficient key realizing shell-and-tube heat exchanger is the efficient augmentation of heat transfer heat exchanger tube of development of new.In heat transfer enhancement technology, finned tube is progressively applied due to the feature that volume is little, heat transfer area is large, efficiency is high.General mode installs fin additional outside pipe, strengthening heat transfer outside a tube.Comparatively speaking, the research work installing the internally finned tube augmentation of heat transfer of fin inside pipe additional is fewer.
Internally finned tube expands heat-transfer area by the mode installing fin in pipe additional, reaches the object of heat transfer efficiency in enhanced tube.Finned tube is gained the name owing to establishing fin on pipe internal surface, and its heat transfer area can increase 2 ~ 10 times than light pipe, and ratio of heat transfer coefficient light pipe can improve 1 ~ 2 times.Because the enhancing of heat-transfer capability and the heat transfer area of unit volume strengthen, therefore compared with light pipe, complete same thermic load and can use comparatively education and correction for juvenile offenders number, make compact equipment and metal wastage is reduced.Because the material of fin can be different from base tube, make the selection and utilization of material just more reasonable.Fin material determines have carbon steel, stainless steel, Al and Alalloy, steel and steel alloy etc. according to environment for use and manufacturing process.In addition, adopt finned tube that the mean temperature difference of medium and wall is reduced, service life extends.
Comprehensive analysis, to the research of existing internally finned tube, finds that its research emphasis is how effective heat transfer area in a large amount of extension tube more, and studies rare for the augmentation of heat transfer mode by reinforced pipe inner fluid Secondary Flow and horizontal flow-disturbing and longitudinal drag reduction.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the invention provides a kind of multidirectional wave-li ke internally finned tubes, its version is various, and easy-formation processing, in pipe, effectively heat transfer area enlarges markedly compared with light pipe, and can mandatory guidance tube fluid Media flow pattern, Secondary Flow strengthens, horizontal flow-disturbing aggravates, turbulivity strengthens, powerful interference fluid media (medium) boundary layer, and reach the object of efficient augmentation of heat transfer, in pipe, longitudinal flow resistance is controlled simultaneously, compared with other common internally finned tube, reach same thermic load, resistance significantly reduces.
For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions: a kind of multidirectional wave-li ke internally finned tubes, and its overall structure is made up of outer tube 1 and core pipe 2 and several multi-directional wave corrugated fins 3.The pipe axis of outer tube 1 and core pipe 2 overlaps, and core pipe 2 is nested in outer tube 1.Several multi-directional wave corrugated fins 3 are uniformly distributed along the ring section circumference formed between outer tube 1 and core pipe 2, and arbitrary neighborhood two multi-directional wave corrugated fins 3 do not contact each other.The formation of multi-directional wave corrugated fin 3, comprises the straight wall 5 of a root 4, two and multidirectional ripple 7 is arranged in two bendings 6 and two.The root 4 of multi-directional wave corrugated fin 3 and the outer surface soldering of core pipe 2, straight wall 5 is along outer tube 1 circumferentially extending, and the inner surface soldering of two bending 6 and outer tube 1.Outer tube 1 is marked off several independently concurrent flow circulation passage by core pipe 2 and several multi-directional wave corrugated fins 3.Multi-directional wave 7 is positioned on the straight wall 5 of multi-directional wave corrugated fin 3; Each straight wall 5 there is one group of multidirectional ripple 7 of continuous print; On same wall 5 always, the lines trend of multidirectional ripple 7 is consistent.
The cross section of described outer tube 1 can be circular, ellipse, rectangle and other polygon, and petal.
The outer surface of described outer tube 1 is dispersed with groove 19; And groove 19 can only be positioned at the top of the concurrent flow circulation passage that multi-directional wave corrugated fin 3 is formed with outer tube 1, on the outer surface of the outer tube 1 that namely this parallel channels is corresponding.The definition of groove 19 is the pits sunk into pipe from outer tube 1 outer surface.
The layout of described groove 19 is divided into two large classes, i.e. regular and non-regularity distribution.Regularity distribution refers to groove 19 generally along the arrangement of outer tube 1 axis direction, can state by certain mathematical function relationship formula; Non-regularity distribution refers to that groove 19 cannot be stated by certain mathematical function relationship formula, is randomly arranged on the outer surface of outer tube 1.
During the regularity distribution of described groove 19, groove 19 can be divided into many groups or arrange more.
The shape of described groove 19 can be spheroid, ellipsoid nullisomic, cube, cuboid, polygon-prism and polygon terrace with edge and Else Rule and anomalistic object.
The cross section of described core pipe 2 can be circular, oval, square, rectangle and other polygon.
Described core pipe 2 can be light pipe, bellows, spiral grooved tube, finned tube and special pipe.
Described core pipe 2 have distributing fin 18 in appearance; And distributing fin 14 can only be positioned at the below of the concurrent flow circulation passage that multi-directional wave corrugated fin adjacent one another are 3 is formed with outer tube 1, on the outer surface of the namely core pipe 2 that this parallel channels is corresponding.
The layout of described distributing fin 18 is divided into two large classes, i.e. regular and non-regularity distribution.Regularity distribution refers to distributing fin 18 generally along the arrangement of core pipe 2 axis direction, can state by certain mathematical function relationship formula; Non-regularity distribution refers to that distributing fin 18 cannot be stated by certain mathematical function relationship formula, is randomly arranged on the outer surface of core pipe 2.
During the regularity distribution of described distributing fin 14, distributing fin 18 can be divided into many groups or arrange more.
Described distributing fin 18 can be continuum, also can be discontinuous or segmented.
The cross section of described distributing fin 18 can be rectangle, trapezoidal, V-arrangement, U-shaped and sinusoidal.
Described core pipe 2 also can have multiple hole or many seams.
Described core pipe 2 as supporter, can become the part of whole multidirectional wave-li ke internally finned tubes, plays multi-directional wave corrugated fin 3 structural strength in reinforced pipe, increases part effectively heat transfer area and guide functions.The root 4 of described multi-directional wave corrugated fin 3 contacts with core pipe 2, can be linear contact lay, also can be face contact.
Described arbitrary neighborhood two multi-directional wave corrugated fins 3 do not contact each other.
The quantity of the multi-directional wave corrugated fin 3 in described multidirectional wave-li ke internally finned tubes, can need according to actual condition and determine.
Outer tube 1 is marked off several independently concurrent flow circulation passage by described core pipe 2 and several multi-directional wave corrugated fins 3, and cross-sectional area comprises petal, trapezoidal, U-shaped, V-arrangement or rectangle.
The concrete form of described multidirectional ripple 3 can be straight wave mode 7, sinusoidal waveform 8, angle wave mode 9.
The rib top 15 of described multidirectional ripple 7 and the angle separately between straight wall 5 cardinal extremity 14 axis 13 direction, place are α, wherein 0≤ α<180; For the angle on same multi-directional wave corrugated fin 3, two straight walls 5 αvalue can be identical, also can be different; For the angle on any two multi-directional wave corrugated fins 3, four straight walls 5 αvalue can be identical, also can part identical, or completely different.
Described for the angle on same multi-directional wave corrugated fin 3, two straight walls 5 αwhen being worth identical, multidirectional ripple 7 has two kinds of special arrangement, namely one be on two straight walls 5 the corresponding crest 10 of crest 10, trough 11 relative to trough 11; Two is the corresponding troughs 11 of crest 10.
On each straight wall 5 of described multidirectional inner fin 3, the multidirectional ripple 7 of many groups can be had; Often organizing multidirectional ripple can be continuous print, also can be discontinuous.
Described multidirectional wave-li ke internally finned tubes for low-viscosity fluid media (medium), the overall length of multidirectional ripple 7 l, beam overall wand crest height hlarger, wave pitch pless, the angle on each straight wall 5 αmore different, the flute pitch 19 of outer tube 1 is less simultaneously, then multidirectional wave-li ke internally finned tubes is stronger to the heat transfer of tube fluid medium.During the above-mentioned each parameter of suitable adjustment, the tube fluid medium of multidirectional ripple inner fin can be conducted heat by efficient hardening, and fluid media (medium) longitudinal flow resistance also can be made controlled, compared with even common with other internally finned tube, reach same thermic load, resistance significantly reduces simultaneously.
The pipe and sheet that described multidirectional wave-li ke internally finned tubes uses comprises carbon steel, stainless steel, Al and Alalloy, steel and steel alloy, Copper and its alloy and other specialty metal.
Same principle, the invention also discloses a kind of multidirectional wave-li ke internally finned tubes, comprises outer tube, it is characterized in that: be evenly distributed with multiple multidirectional ripple inner fin at the inner peripheral surface of described outer tube; Described multidirectional ripple inner fin comprises a root, two straight walls and two bendings, and described two straight walls are distributed with multidirectional ripple, and the lines trend of the multidirectional ripple on same wall is always consistent; The inner surface soldering of described bending and described outer tube; Described straight wall is along described outer tube circumferentially extending; Described outer tube and described multidirectional ripple inner fin form multiple concurrent flow circulation passage.
Further, described multidirectional wave-li ke internally finned tubes also comprises core pipe, and described core pipe is nested with described outer concentric tube, the root of described multidirectional ripple inner fin and the outer surface soldering of described core pipe; Described multiple concurrent flow circulation passage is separate in point cutting off of described outer tube, described core pipe and described multidirectional ripple inner fin.
Core pipe, as supporter, becomes the part of whole multidirectional wave-li ke internally finned tubes, plays the structural strength of multidirectional ripple inner fin in reinforced pipe, increases effective heat transfer area and guide functions.
Further, for being conducive to effective interference and the destruction of High-Sr granite flow boundary layer and temperature boundary layer, thus augmentation of heat transfer, described core pipe has multiple hole or many seams.
Further, described multiple multidirectional ripple inner fin is not in contact with each other mutually.
Further, fluted on described outer tube, described groove is positioned at the outer surface of the described outer tube corresponding with described concurrent flow circulation passage.
Further, described groove arranges along described outer tube axis direction, and the groove corresponding with described concurrent flow circulation passage is one or more groups arbitrarily; Or described groove is randomly dispersed on the outer surface of described outer tube.
For effectively auxiliary multidirectional ripple inner fin, circulation passage inner fluid medium is made to be easier to produce TRANSFER BY PULSATING FLOW or helical flow, and increase heat transfer area, the outer surface of the core pipe that adjacent multidirectional ripple inner fin is corresponding with the concurrent flow circulation passage that outer tube, core pipe are formed is distributed with distributing fin.
Further, described distributing fin arranges along described core tube axis direction, and the distributing fin that arbitrary neighborhood multidirectional ripple inner fin is corresponding with the concurrent flow circulation passage that outer tube, core pipe are formed is one or more groups; Or described distributing fin is randomly dispersed on the outer surface of described core pipe.
Further, the lines on the straight wall of described multidirectional ripple inner fin and the angle between the direction, axis place of this straight wall in lines place are α, wherein 0≤α <180; The value of the angle α between the direction, axis place of the lines on the straight wall of any described multidirectional ripple inner fin and this straight wall in lines place complete identical, part is identical or completely not identical.
Further, the medium viscosity circulated in internally finned tube is less, overall length L, the beam overall W and crest height H of the multidirectional ripple on described straight wall are larger, wave pitch P is less, the value of the angle α between the direction, axis place of the lines on the straight wall of any described multidirectional ripple inner fin and this straight wall in lines place is more different, the flute pitch S of outer tube is less, and the heat transfer of multidirectional wave-li ke internally finned tubes to tube fluid medium is stronger, wherein 45≤α <135.
The present invention compared with prior art has the following advantages: 1, version is various, and easily manufactures processing; 2, adopt multidirectional ripple inner fin, effectively can increase heat transfer area compared with light pipe; 3, adopt multidirectional ripple inner fin, multidirectional ripple can realize the disturbance of circulation passage inner fluid medium side interlayer, increases turbulivity, thus heat convection in enhanced tube; 4, the lines on the straight wall of multidirectional ripple inner fin and the angle between the direction, axis place of this straight wall in lines place are α, and its value can be versatile and flexible as required, excursion 0≤α <180; 5, same multidirectional ripple inner fin, time angle α value on two straight walls identical (0 < α <180), circulation passage inner fluid medium is made to present TRANSFER BY PULSATING FLOW, this liquid form can cause periodicity blending and the mass transfer of near wall fluid in passage, plays significant augmentation of heat transfer effect; 6, same multidirectional ripple inner fin, time angle α value on two straight walls different (0 < α <180), circulation passage inner fluid medium is made to present helical flow, the now flowing of ripple near wall region fluid provides constraints, and produces additional rotational motion, thus is thinned the thickness of heat transfer boundary layer, also cause reverse barometric gradient simultaneously, make boundary layer separation, and make fluid radial direction mixing aggravation, thus totally improve heat transfer efficiency; 7, α value choose the form determining tube fluid, i.e. TRANSFER BY PULSATING FLOW and helical flow, and both all effectively can suppress in-tube fouling, have self-cleaning function; 8, because multidirectional ripple inner fin is absolute construction, same multidirectional wave-li ke internally finned tubes, several multidirectional ripple inner fins can be had, and the α value on each multidirectional ripple inner fin can be identical, also can part identical, even completely different, this just makes in the different fluid passage of same multidirectional wave-li ke internally finned tubes, can simultaneously existing TRANSFER BY PULSATING FLOW, there is helical flow again; 9, outer tube outer surface is dispersed with the groove impacting and produce, the bottom of groove is absorbed in pipe, such surface can realize disturbance or the destruction of managing inside and outside fluid media (medium) boundary layer, thus the inside and outside heat convection of enhanced tube, and a large amount of grooves adds additional heat transfer area; 10, the groove of outer tube outer surface and the distributing fin sheet of core tube outer surface, can effectively assist multidirectional ripple inner fin, make circulation passage inner fluid medium be easier to produce TRANSFER BY PULSATING FLOW or helical flow, distributing fins a large amount of in addition also additionally can increase heat transfer area; 11, especially for low-viscosity fluid, overall length L, the beam overall W and crest height H of multidirectional ripple are larger, wave pitch P is less, the value of the angle α between the direction, cross section place of the lines on the straight wall of any multidirectional ripple inner fin and this straight wall in lines place is more different, the flute pitch S of outer tube is less simultaneously, then multidirectional wave-li ke internally finned tubes is stronger to the heat transfer of tube fluid medium.During the above-mentioned each parameter of suitable adjustment, the tube fluid medium of multidirectional wave-li ke internally finned tubes can be conducted heat by efficient hardening, and fluid media (medium) longitudinal flow resistance also can be made controlled, even compared with common internally finned tube, reach same thermic load, resistance significantly reduces simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of the present invention when having a core pipe.
Fig. 3 is scheme of installation of the present invention.
Fig. 4 is multidirectional ripple inner fin structural representation of the present invention.
Fig. 5 is multidirectional ripple inner fin shaping substrate structural representation of the present invention.
Fig. 6 is multidirectional ripple parameter definition schematic diagram of the present invention.
Fig. 7 is core tubular construction schematic diagram of the present invention.
Fig. 8 is outer tube structure schematic diagram of the present invention.
Fig. 9 is outer tube cross sectional representation of the present invention.
In figure: 1-outer tube; 2-core pipe; The multidirectional ripple inner fin of 3-; 4-root; The straight wall of 5-; 6-bending; The multidirectional ripple of 7-; 8-sinusoidal waveform; 9-angle wave mode; 10-crest; 11-trough; 12-angle α; 13-axis; 14-cardinal extremity; 15-rib top; 16-rib bottom; 17-tail end; 18-distributing fin; 19-groove; S-flute pitch; L-ripple overall length; W-ripple beam overall; H-crest height; P-wave pitch.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1.
As shown in Figure 1 and Figure 4, the present invention includes outer tube 1, multiple multidirectional ripple inner fin 3 is evenly distributed with at the inner peripheral surface of outer tube 1, multidirectional ripple inner fin 3 comprises the straight wall 5 of a root 4, two and two bendings 6, two straight walls 5 are distributed with multidirectional ripple 7, and the lines trend of the multidirectional ripple 7 on same wall is always consistent, the inner surface soldering of bending 6 and outer tube 1, straight wall 5 is along outer tube 1 circumferentially extending, and outer tube 1 and multidirectional ripple inner fin 3 form multiple concurrent flow circulation passage.
Embodiment 2.
As shown in Figure 2, Figure 3 and Figure 4, as improvement of the present invention, multidirectional wave-li ke internally finned tubes of the present invention also comprises core pipe 2, core pipe 2 and outer tube 1 nested, concentric, the pipe axis of outer tube 1 and core pipe 2 overlaps, the root 4 of multidirectional ripple inner fin 3 and the outer surface soldering of core pipe 2, outer tube 1 is divided into several independently concurrent flow circulation passage by core pipe 2 and multiple multidirectional ripple inner fin 3.Core pipe 2, as supporter, becomes the part of whole multidirectional wave-li ke internally finned tubes, plays multidirectional ripple inner fin 3 structural strength of enhancing, increases effective heat transfer area and guide functions.
As shown in Figure 4, Figure 5 and Figure 6, multidirectional ripple inner fin 3 comprises 5, two bendings 6 of the straight wall of a root 4, two and two groups of multidirectional ripples 7.Multidirectional ripple 7 is positioned on the straight wall 5 of multidirectional ripple inner fin 3; Each straight wall 5 there is one group of multidirectional ripple 7 of continuous print; On same wall 5 always, the lines trend of multidirectional ripple 7 is consistent.In the processing and making process of multidirectional ripple inner fin 3 shaping substrate, can roll out multidirectional ripple 7 in substrate axisymmetrical both sides, the multidirectional ripple 7 rolled out can be continuous print, also can be discontinuous.During roll extrusion, also can repeatedly roll extrusion, form the multidirectional ripple 7 of many groups; And the concrete shape of multidirectional ripple 7 according to operating mode needs, can change the shape of gear hobbing, the ripple rolled out can be straight wave mode, sinusoidal waveform 8 or angle wave mode 9.
Here angle parameter is defined, assuming that the arbitrary end of shaping substrate is as cardinal extremity 14, the corresponding other end is tail end 17, after shaping substrate rolls out multidirectional ripple 7, the part of rib (or lines) near shaping substrate edge of multidirectional ripple 7 is called rib top 15, part near shaping substrate inside is called rib bottom 16, the angle in axis 13 direction of the cardinal extremity 14 of the rib top 15 of multidirectional ripple 7 and place shaping substrate (or straight wall 5 of multidirectional ripple inner fin 3) is α (lines on the straight wall of multidirectional ripple inner fin and the angle between the direction, axis place of this straight wall in lines place), wherein 0≤α <180.The concrete lines of multidirectional ripple 7 can according to operating mode needs, and change the angle of gear hobbing, roll extrusion forms specific angle α.For same substrate, when the angle α value of both sides is identical, the multidirectional ripple 7 that roll extrusion is formed has two kinds of arrangement forms, and namely one is that the corresponding crest 10 of crest 10, trough 11 are relative to trough 11; Two is the corresponding troughs 11 of crest 10.Described multidirectional ripple 7, after shaping substrate roll extrusion completes, adopts mechanical pressing and rolling process formable metal substrate to be processed into multidirectional ripple inner fin.
Many parameters of multidirectional wave-li ke internally finned tubes, should determine, and the main operating mode factor that affecting parameters is determined are fluid media (medium) viscosity, heat transfer efficiency and resistance pressure drop according to concrete operating mode.For low-viscosity fluid media (medium), the quantity of multidirectional ripple inner fin 3 the more, its overall length L, beam overall W and crest height H are larger, wave pitch P is less, angle α (scope 45≤α <135) on each straight wall 5 is more different, make any circulation passage inner fluid medium present further violent longitudinal spiral flowing, thus heat transfer efficiency is higher.In addition, increase the group number of the multidirectional ripple 7 on the straight wall 5 of each multidirectional ripple inner fin 3, heat transfer efficiency also can be made to improve.But said method will bring an obvious problem, and namely flow resistance also increases thereupon.The key of head it off, is just choosing of multidirectional ripple inner fin form.When other Parameter Conditions above-mentioned is constant, the angle α (scope 45≤α <135) on each straight wall 5 should be identical as far as possible, although heat transfer efficiency reduces to a certain extent, amplitude is also little, and flow resistance significantly reduces; Adjust multidirectional ripple arrangement further again, namely adopt crest 10 corresponding trough 11 form, flow resistance continues to decline, and heat transfer efficiency is influenced hardly.And for High-Sr granite medium, processing mode is similar to low-viscosity fluid media (medium), its difference is the span (0 < α <45 or 135 < α <180) of angle α, and such difference ensure that the circulation of high viscosity fluid.
According to the feature of above-mentioned multidirectional ripple inner fin 3, manufacture in the process of the multidirectional wave-li ke internally finned tubes of processing, according to the heat exchange amount of working condition requirement, quantity and the length of multidirectional ripple inner fin 3 should be determined, the overall length L of multidirectional ripple 7, beam overall W, and the group number of multidirectional ripple 7 on each straight wall 5; According to the stickiness of fluid media (medium), determine the scope of angle α; According to flow resistance restriction requirement, determine the crest height H of multidirectional ripple 7, wave pitch P, angle α value, shape and arrangement form; According to the parameter of the multidirectional ripple inner fin 3 determined, determine length and the diameter of outer tube 1 and core pipe 2.
As shown in Figure 7, core pipe 2 outer surface, according to the quantity of multidirectional ripple inner fin 3, marks off the region of equal number, by the method for high-frequency welding in this region, and welding distributing fin 18.The welding of distributing fin 18 is arranged and is divided into two large classes, i.e. regular and non-regularity distribution.Regularity distribution refers to distributing fin 18 generally along the arrangement of core pipe 2 axis direction, and can state by certain mathematical function relationship formula, distributing fin 18 can be divided into many groups or arrange more; Non-regularity distribution refers to that distributing fin 18 cannot be stated by certain mathematical function relationship formula, is randomly arranged on the outer surface of core pipe 2.Distributing fin 18 can be continuum, also can be discontinuous or segmented.The cross section of distributing fin 18 can be rectangle, trapezoidal, V-arrangement, U-shaped or sinusoidal.The Main Function of distributing fin is effectively assist multidirectional ripple inner fin 3, and make circulation passage inner fluid medium be easier to produce TRANSFER BY PULSATING FLOW or helical flow, distributing fins 18 a large amount of in addition also can additionally increase a certain amount of heat transfer area.The cross section of core pipe 2 can be processed into circle, ellipse, square, rectangle or other polygon.Core pipe 2 can replace with light pipe, bellows, spiral grooved tube, finned tube or special pipe.Core pipe 2 also can have multiple hole or many seams, be conducive to effective interference and the destruction of High-Sr granite flow boundary layer and temperature boundary layer, thus augmentation of heat transfer.
As shown in Figure 8 and Figure 9, the outer surface of outer tube 1 impacts fluted 19, and groove 19 can only be positioned at the top of the concurrent flow circulation passage that multidirectional ripple inner fin 3 is formed with outer tube 1, on the outer surface of the outer tube 1 that namely this concurrent flow circulation passage is corresponding.The definition of groove 19 is the pits sunk into from the outer surface of outer tube 1 to pipe.The impact position of groove 19 is divided into two large classes, and namely regular and non-regularity impacts distribution.Regular impact distribution and refer to that groove 19 arranges along the axis direction of outer tube 1 generally, can state by certain mathematical function relationship formula, groove 19 can be divided into many groups or arrange more; Non-regularity impacts distribution and refers to that groove 19 cannot be stated by certain mathematical function relationship formula, is randomly arranged on the outer surface of outer tube 1.The impact shape of groove 19 can be spheroid, ellipsoid nullisomic, cube, cuboid, polygon-prism, polygon terrace with edge and Else Rule or anomalistic object.
The above; only embodiments of the invention; not the present invention is imposed any restrictions, every above embodiment is done according to technical spirit of the present invention any simple modification, change and equivalent structure change, all belong to the protection domain of technical solution of the present invention.

Claims (7)

1. a multidirectional wave-li ke internally finned tubes, it is characterized in that: it is made up of outer tube (1) and core pipe (2) and several multi-directional wave corrugated fins (3), the pipe axis of outer tube (1) and core pipe (2) overlaps, core pipe (2) is nested in outer tube (1), several multi-directional wave corrugated fins (3) are uniformly distributed along the ring section circumference formed between outer tube (1) and core pipe (2), arbitrary neighborhood two multi-directional wave corrugated fins (3) do not contact each other, and outer tube (1) outer surface is dispersed with groove (19) regularly; The formation of described multi-directional wave corrugated fin (3): comprise a root (4), two straight walls (5) and two bendings (6) and two groups of multidirectional ripples (7), the root (4) of multi-directional wave corrugated fin (3) and the intimate of core pipe (2) are affixed, straight wall (5) is along outer tube (1) circumferentially extending, and the inner surface rigid contact of two bending (6) and outer tube (1); Outer tube (1) is marked off several independently concurrent flow circulation passage by core pipe (2) and several multi-directional wave corrugated fins (3); Multidirectional ripple (7) is positioned on the straight wall (5) of multi-directional wave corrugated fin (3); Each straight wall (5) there is one group of multidirectional ripple of continuous print (7); On same wall (5) always, the lines trend of multidirectional ripple (7) is consistent;
Angle between the rib top (15) of described multidirectional ripple (7) and respective place Zhi Bi (5) cardinal extremity (14) axis (13) direction is α, wherein 0≤ α<180; For same multi-directional wave corrugated fin (3), the angle on two straight walls (5) αbe worth identical or different; For any two multi-directional wave corrugated fins (3), the angle on four straight walls (5) αbe worth identical, part is identical, or completely different; Described for same multi-directional wave corrugated fin (3), the angle on two straight walls (5) αwhen being worth identical, multidirectional ripple (7) has two kinds of special arrangement, and namely one is that upper crest (10) the corresponding crest (10) of two straight walls (5), trough (11) are relative to trough (11); Two is crest (10) corresponding troughs (11);
Described multidirectional wave-li ke internally finned tubes for low-viscosity fluid media (medium), the overall length of multidirectional ripple (7) l, beam overall wand crest height hlarger, wave pitch pless, the angle on each straight wall (5) αmore different, groove (19) spacing of outer tube (1) is less simultaneously, then multidirectional wave-li ke internally finned tubes is stronger to the heat transfer of tube fluid medium;
Described multi-directional wave corrugated fin (3) root (4) and core pipe (2) are that linear contact lay or face contact; The quantity of the multi-directional wave corrugated fin (3) in described multidirectional wave-li ke internally finned tubes, needs according to actual condition and determines; The concrete form of described multi-directional wave corrugated fin (3) is straight wave mode, sinusoidal waveform (8), angle wave mode (9); On each straight wall (5) of described multi-directional wave corrugated fin (3), have the multidirectional ripple of many groups (7), often organizing multidirectional ripple is continuous print or discontinuous.
2. multidirectional wave-li ke internally finned tubes according to claim 1, is characterized in that: the cross section of described outer tube (1) is circular, oval or rectangle; The cross section of described core pipe (2) is circular, oval, square or rectangle; The shape of described groove (19) is spheroid, ellipsoid nullisomic, cube, cuboid, polygon-prism or polygon terrace with edge.
3. multidirectional wave-li ke internally finned tubes according to claim 1, it is characterized in that: the groove (19) of described outer tube (1) outer surface is positioned at the top of the concurrent flow circulation passage that multi-directional wave corrugated fin (3) is formed with outer tube (1), on the outer surface of the outer tube (1) that namely this parallel channels is corresponding; Described groove (19) is the pit sunk into pipe from outer tube (1) outer surface; The layout of described groove (19) is divided into two large classes, i.e. regular and non-regularity distribution; Regularity distribution refers to groove (19) generally along the arrangement of outer tube (1) axis direction, states by certain mathematical function relationship formula; Non-regularity distribution refers to that groove (19) cannot be stated by certain mathematical function relationship formula, is randomly arranged on the outer surface of outer tube (1); During the regularity distribution of described groove (19), groove (19) is divided into many groups or arrange more.
4. multidirectional wave-li ke internally finned tubes according to claim 1, is characterized in that: described core pipe (2) is light pipe, bellows, spiral grooved tube, finned tube or special pipe; Described core pipe (2) has multiple hole or many seams; Described core pipe (2) have distributing fin (18) in appearance; Described distributing fin (18) is positioned at the below of the concurrent flow circulation passage that multi-directional wave corrugated fin (3) adjacent one another are and outer tube (1) are formed, on the outer surface of the namely core pipe (2) that this parallel channels is corresponding; The layout of described distributing fin (18) is divided into two large classes, i.e. regular and non-regularity distribution; Regularity distribution refers to distributing fin (184) generally along the arrangement of core pipe (2) axis direction, states by certain mathematical function relationship formula; Non-regularity distribution refers to that distributing fin (18) cannot be stated by certain mathematical function relationship formula, is randomly arranged on the outer surface of core pipe (2); During the regularity distribution of described distributing fin (18), distributing fin (18) is divided into many groups or arrange more; Described distributing fin (18) is continuum or discontinuous; The cross section of described distributing fin (18) is rectangle, trapezoidal, V-arrangement, U-shaped or sinusoidal.
5. multidirectional wave-li ke internally finned tubes according to claim 1, it is characterized in that: outer tube (1) is marked off several independently concurrent flow circulation passage by described core pipe (2) and several multi-directional wave corrugated fins (3), and cross-sectional area comprises trapezoidal, U-shaped, V-arrangement or rectangle; The pipe and sheet that described multidirectional wave-li ke internally finned tubes uses comprises carbon steel, stainless steel, Al and Alalloy, steel and steel alloy, Copper and its alloy and other specialty metal.
6. according to the multidirectional wave-li ke internally finned tubes one of claim 1 to 5 Suo Shu, it is characterized in that: described core pipe (2) is as supporter, become the part of whole multidirectional wave-li ke internally finned tubes, play multi-directional wave corrugated fin (3) structural strength in reinforced pipe, increase part effectively heat transfer area and guide functions.
7. a multidirectional wave-li ke internally finned tubes, comprises outer tube, it is characterized in that: be evenly distributed with multiple multidirectional ripple inner fin at the inner peripheral surface of described outer tube; Described multidirectional ripple inner fin comprises a root, two straight walls and two bendings, and described two straight walls are distributed with multidirectional ripple, and the lines trend of the multidirectional ripple on same wall is always consistent; The inner surface soldering of described bending and described outer tube; Described straight wall is along described outer tube circumferentially extending; Described outer tube and described multidirectional ripple inner fin form multiple concurrent flow circulation passage;
Comprise core pipe, described core pipe is nested with described outer concentric tube, the root of described multidirectional ripple inner fin and the outer surface soldering of described core pipe; Described multiple concurrent flow circulation passage is separate in point cutting off of described outer tube, described core pipe and described multidirectional ripple inner fin;
Described core pipe has multiple hole or many seams; Described multiple multidirectional ripple inner fin is not in contact with each other mutually; Fluted on described outer tube, described groove is positioned at the outer surface of the described outer tube corresponding with described concurrent flow circulation passage; Described groove arranges along described outer tube axis direction, and the groove corresponding with described concurrent flow circulation passage is one or more groups arbitrarily; Or described groove is randomly dispersed on the outer surface of described outer tube; The outer surface of the core pipe that adjacent multidirectional ripple inner fin is corresponding with the concurrent flow circulation passage that outer tube, core pipe are formed is distributed with distributing fin; Described distributing fin arranges along described core tube axis direction, and the distributing fin that arbitrary neighborhood multidirectional ripple inner fin is corresponding with the concurrent flow circulation passage that outer tube, core pipe are formed is one or more groups; Or described distributing fin is randomly dispersed on the outer surface of described core pipe;
Lines on the straight wall of described multidirectional ripple inner fin and the angle between the direction, axis place of this straight wall in lines place are α; The value of the angle α between the direction, axis place of the lines on the straight wall of any described multidirectional ripple inner fin and this straight wall in lines place is identical, part is identical or completely not identical; The medium viscosity circulated in internally finned tube is less, overall length L, the beam overall W and crest height H of the multidirectional ripple on described straight wall are larger, wave pitch P is less, the value of the angle α between the direction, axis place of the lines on the straight wall of any described multidirectional ripple inner fin and this straight wall in lines place is more different, the flute pitch S of outer tube is less, the heat transfer of multidirectional wave-li ke internally finned tubes to tube fluid medium is stronger, wherein 45≤α <135.
CN201310134366.3A 2013-04-18 2013-04-18 Multidirectional wave-li ke internally finned tubes Active CN103175429B (en)

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CN108151571B (en) * 2017-12-25 2019-08-09 南京工业大学 A kind of spiral venetian blind type rectangle internally finned tube
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