CN1190646C - Rhombic intensified heat exchange tube - Google Patents
Rhombic intensified heat exchange tube Download PDFInfo
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- CN1190646C CN1190646C CNB031047688A CN03104768A CN1190646C CN 1190646 C CN1190646 C CN 1190646C CN B031047688 A CNB031047688 A CN B031047688A CN 03104768 A CN03104768 A CN 03104768A CN 1190646 C CN1190646 C CN 1190646C
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- rhombus
- pipeline section
- section
- tube
- rhombic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
Abstract
The present invention provides a reinforced heat exchange tube of a rhombic tube, which relates to a reinforced heat exchange element. The reinforced heat exchange tube of a rhombic tube is composed of a plurality of rhombic tube sections, elliptical tube sections and circular-elliptical transition sections. The cross sections of both ends of the rhombic tube section form elliptical shapes, and two elliptical long axes cross 15 to 90 DEG of an angle. Both of the two ends of the tube section change towards a center, and the ellipticity of the cross section is gradually reduced until the cross section of the tube section center changes into a circle. The elliptical tube sections are positioned on both ends of each rhombic tube section, the rhombic tubes are divided into regular rhombic tubes and irregular rhombic tubes, and the inner surface and the outer surface of the rhombic tube are smooth and can be replaced by low ribs surfaces or threaded surfaces. The rhombic reinforced heat exchange tube provided by the present invention is designed according to 'a field synergy principle ', and has the advantages of remarkable heat exchanging and reinforcing function and little flow resistance increase. A heat exchanger manufactured by the rhombic reinforced heat exchange tube of the present invention has the advantages of less possibility of scale formation, small vibration, long service life, etc., and the performance of the heat exchanger can be greatly increased.
Description
Technical field
The present invention relates to a kind of enhanced heat exchange element, particularly a kind of rhombus thermoexcell belongs to heat exchange reinforcement and technical field of heat exchangers.
Background technology
Shell-and-tube heat exchanger (comprising double pipe heat exchanger) is one of most popular heat exchanger in the heat exchanger family.History that let it be to the greatest extent is very long, technology is ancient relatively, yet because its manufacturing technology is fairly simple, material obtains easily, cost is cheap relatively, and can adapt to high temperature, condition of high voltage or the like fine quality, still extensive use in oil, chemical industry, power or the like industrial department so far.On the other hand, people also constantly making great efforts to improve it, particularly invent various thermoexcells and replace common pipe to make shell-and-tube heat exchanger, and its heat exchange efficiency is lower to overcome, consumption of materials big and huger or the like the shortcoming of volume ratio.A chapter 8 all has detailed introduction to existing various thermoexcells among institutes work " enhanced heat exchange " (Science Press 1990) book such as Gu Weizao, refreshing family are sharp, Ma Chongfang, Zhang Yuming and the chief editor of Lanzhou Oil Machine Research Institute " heat exchanger " (hydrocarbon processing publishing house 1988).Existing thermoexcell cardinal principle can be divided into two classes, and the first kind is that insertion fried dough twist iron, spinning disk, lap-ups silk, palpus hair wait disturbance fluid, manufacturing eddy current or the heat conduction of increase fluid or the like to strengthen intraductal heat exchange in pipe; Second class is to be shape tubes such as elliptical tube, convergent-divergent pipe, screwed pipe, low ribbed pipe with pipe by the transformation of the way of common pipe, comes heat exchange inside and outside the enhanced tube simultaneously or the like by increasing heat exchange area or increasing the unstability that flows.Though prior art is having positive effect aspect the enhancing heat exchange, but also there is some weak point: at first be that some enhanced tube is in enhanced heat exchange, flow resistance or power consumption increase manyly, therefore little from the angle income of energy effective utilization, secondly be that some enhanced tube manufacturing expense increases more and heat exchange area reduces little so that economic benefit is obvious inadequately.In addition, it is very tight that the clean-up performance of first kind method convection cell requires, and increased the workload of cleaning, maintenance.Therefore, prior art does not obtain general applying as yet.
According to the academician of the Chinese Academy of Sciences, the professor of Tsing-Hua University crosses the newest research results that increases people such as unit---and " synergistic principle ", in Convective Heat Transfer,, the collaborative degree of velocity field and temperature gradient field (for example reduces the angle between velocity and the thermograde vector if being improved, uniformity that gathers way or the like) just can enhanced heat exchange and flow resistance increase (Guo Z.Y seldom, Mechanism and Control of Convective Heat Transfer-Coordination of Velocity and Heat FlowField, Chinese Science Bulletin, 46 (7): 596-599 Apr.2001).As everyone knows, impact jet flow is very strong to the heat convection of wall, and its reason is close to zero with regard to being the angle between velocity and the thermograde vector.
Chinese invention patent " cross elliptic-section heat exchange pipe " (application number: 00136122.8, Gazette of Patent for Invention the 18th the 31st phase of volume) has proposed a kind of new heat exchanger tube.This heat exchanger tube is interconnected by changeover portion by many oval pipeline sections and forms, and between the transverse of adjacent ellipses pipeline section mutually at an angle, normally 60 the degree or 90 the degree, oval pipeline section is the main body of heat exchange.In this pipe, the collaborative degree of the velocity field of tube fluid and temperature gradient field obtains very big improvement, the increase of flow resistance and not very big so its heat exchange obtains bigger reinforcement.But find after deliberation: the collaborative situation of fluid velocity field and temperature gradient field is only relatively good near the import of oval pipeline section, and reaches desirable degree, the leeway so its heat exchange property also improves a lot far away in other places.
Summary of the invention
The objective of the invention is according to " synergistic principle " and at the defective of above-mentioned prior art, a kind of rhombus thermoexcell is provided, this pipe can reach the multiple target that strengthens heat exchange, conserve energy, raising heat exchanger economic benefit better than above-mentioned technology, simultaneously, it also has advantages such as less scaling, easy cleaning, minimizing vibration.
Technical solution of the present invention is as follows: a kind of rhombus thermoexcell, and it is the rhombus pipeline section by some longitudinal sections, and cross section is formed by oval pipeline section and circle-oval transitional pipe segment, and the rhombus pipeline section is the main body of heat exchange; Its two ends cross section of described rhombus pipeline section is reduced by the ovality of pipeline section two ends to its cross section of center gradually for intersecting 15～an angle of 90 degrees between oval and two transverses, becomes circle (or sub-circular) up to the pipeline section center cross-sectional; Rhombus pipeline section and oval pipeline section be periodic arrangement successively.
Rhombus pipeline section two ends shape of cross section of the present invention or oval pipeline section shape of cross section are standard ellipse or sub-elliptical.
Technical characterictic of the present invention is that also the center of the center of described rhombus pipeline section two ends cross section and oval pipeline section cross section on the axis of parent tube, forms normal rhombus pipe; Or on the axis of parent tube, not forming rhomboid pipe, its off-axis is apart from t≤(A-B)/2.
The length of rhombus pipeline section of the present invention is 1～10 with the ratio of its parent tube inner diameter d, and the length of each rhombus pipeline section is isometric or not isometric; The length of elliptical tube is 0.05～1.0 with the ratio of its parent tube inner diameter d, and the length of oval pipeline section is isometric or not isometric; The major axis of oval pipeline section external diameter is 1.1～2.5 with the ratio of its minor axis, and it is preferably 1.3～1.7.The length L t of circle-oval changeover portion gets Lr/2 〉=Lt 〉=0.1d; Its preferred length is got Lt=Lr/2.
Another technical characterictic of the present invention also is: also can comprise the rhombus pipeline section of some lengthenings in whole rhumbatron, the part of this lengthening is positioned at the middle part of this rhombus pipeline section and has circular cross-section.
In order further to increase its heat exchange area, the surfaces externally and internally of thermoexcell of the present invention is smooth surface, low rib surface or thread surface.
The present invention compared with prior art has the following advantages and the high-lighting progress:
Compare with common pipe, average convection transfer rate increases 50% (turbulent flow)～500% (laminar flow) in the pipe of rhombus thermoexcell provided by the invention, and corresponding resistance coefficient only increases by 40%～100%.Studies show that: though pipe is interior without any insert, because several vertical whirlpools bundles have been brought out in the ingenious variation of cross section of fluid channel in fluid inside.The existence of these whirlpool bundles is greatly improved the collaborative degree of velocity field and temperature gradient field, thereby has strengthened heat transfer process greatly just.Simultaneously, owing to there are not various inserts to consume mobile energy, the energy of whirlpool bundle can well be recovered, so flow resistance can significantly not increase.The continuous generation and the disappearance of the continuous variation of flow direction, whirlpool bundle make near the mobile very unsure state that presents of wall, have delayed the generation of dirt greatly; The change repeatedly of wall shape also makes dirt became uneven, the density of generation differ, and is very easy to come off and wash away.So compare with common pipe, the rhombus thermoexcell has good resistive connection dirt performance.Because there is not insert in the pipe, its cleaning does not increase extra trouble still as common pipe.Compare with " cross elliptic-section heat exchange pipe ", " rhombus thermoexcell " replaces the main body of oval pipeline section as heat exchange with the rhombus pipeline section, makes heat exchange better effects if, flow resistance littler.
Description of drawings
Fig. 1 is the structural representation of normal rhombus pipe of the present invention.
Fig. 2 is the E-E view of Fig. 1.
Fig. 3 is the structural representation of rhomboid pipe of the present invention.
Fig. 4 is the E-E view of Fig. 3.
The specific embodiment
Further specify concrete structure of the present invention below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the normal rhombus pipe made with common pipe.Whole normal rhombus pipe is made up of some normal rhombus pipe sections 1, oval pipeline section 2, circle-oval transitional pipe segment 3 and two terminal circle pipeline section 4.All there is very short oval pipeline section 2 (for the needs of rhombus pipeline section shaping) at the two ends of each rhombus pipeline section, and rhombus pipeline section and oval pipeline section be periodic arrangement successively, and the rhombus pipeline section is the main body of heat exchange.Reduce gradually to the ovality that the center changes its cross section by rhombus pipeline section two ends, become circle (or sub-circular) up to the pipeline section center cross-sectional.
Whole normal rhombus pipe is to be that the parent tube of d is made after rolling or mold pressing by internal diameter, also can be when rolling seamless pipe once-forming.The length L r of normal rhombus pipe section gets Lr/d=1～10, and each rhombus pipeline section can be isometric or not isometric.The length L e of oval pipeline section gets Le/d=0.05～1.0 (recommending to get the small value) or Lr/Le 〉=1 under the permission of creating conditions, each oval pipeline section can be isometric or not isometric.Oval pipeline section shape of cross section is that standard ellipse or sub-elliptical or two straight lines add oblateness or the symmetry of multistage camber line match and the oblateness of near symmetrical that two circular arcs constitute.The ratio of the long and short axle of oval (oblate) external diameter of pipe is got A/B=1.1～2.5, recommends to select for use A/B=1.3～1.7.Adjacent two oval pipeline sections have an angle C (see figure 2) between the major axis of its ellipse (oblate), get C=15～an angle of 90 degrees, recommend to select for use C to equal 60 degree and 90 and spend two kinds; If heat exchanger tube is got the C=90 degree by quadrangular array in the heat exchanger,, get the C=60 degree if the heat exchanger tube triangularity is arranged.The length L o of two terminal circle pipeline section 4 can get 2～4 times of tube plate thickness, decide on the needs of it and tube sheet assembling, gets the small value satisfying under the prerequisite of assembling needs.The length L t of circle-oval changeover portion gets Lr/2 〉=Lt 〉=0.1d, and two changeover portions can be isometric or not isometric, recommends to select for use isometric and Lt=Lr/2.
Fig. 3 is the structural representation of the rhomboid pipe made with common pipe.Whole rhomboid pipe is made up of some rhomboid pipeline sections 1, oval pipeline section 2, circle-oval changeover portion 3 and two terminal circle pipeline section 4.Whole rhomboid pipe is to be that the parent tube of d is made after rolling or mold pressing by internal diameter, also can be when rolling seamless pipe once-forming.The span of the length L e of the length L t of the length L o of two terminal circle pipeline section, circle-oval changeover portion, rhomboid pipe segment length Lr, oval pipeline section etc. is identical with normal rhombus pipe.The shape of cross section of oval pipeline section is that standard ellipse or sub-elliptical or two straight lines add the oblateness that two circular arcs constitute or symmetry and asymmetric oblateness, semilune and the waist shape of multistage camber line match.The ratio A/B of the long and short axle of oval (oblate) external diameter of pipe, the span of the angle C (see figure 4) between adjacent two its ellipse of oval pipeline section (oblate) major axis are also identical with normal rhombus pipe.Different with normal rhombus pipe is: concerning rhomboid pipe, wherein the center in ellipse (oblate) cross section of initial and end of a period place of each rhomboid pipeline section is not on the axis of parent tube, and certain departing from arranged with axis, and its off-axis is apart from being the t (see figure 3), the span of t is t≤(A-B)/2.
When making shell-and-tube heat exchanger with rhumbatron, if be convenient to install rod baffle, several special rhombus pipeline sections can be set in whole rhumbatron.These special rhombus pipeline sections than other rhumbatrons segment length some, the part of lengthening is positioned at the middle part of pipeline section and has circular cross-section.
The inside and outside surface of rhombus thermoexcell can be smooth surface (for example using common pipe manufacturing), also can be low rib surface or thread surface (for example making with low ribbed pipe or screwed pipe).Rhumbatron with low rib surface is called low rib normal rhombus pipe and low rib rhomboid pipe; What have thread surface then is screw thread normal rhombus pipe and screw thread rhomboid pipe.Low rib rhumbatron and screw thread rhumbatron had not only had an effect of cooperative reinforcing heat exchange but also had had the effect of extended surface enhanced heat exchange, the better effects if of enhanced heat exchange, but the corresponding increase of flow resistance, and also strict to the clean-up performance of working fluid.This two classes rhumbatron is more suitable for being used for working fluid not fibre-bearing and particle, and the occasion that viscosity is big, flowing velocity is very little.
Claims (10)
1. rhombus thermoexcell, it is characterized in that: it is the pipeline section of rhombus by some longitudinal sections, cross section is formed by oval pipeline section, circle-oval changeover portion, the two ends cross section of described rhombus pipeline section is for intersecting 15～an angle of 90 degrees between oval and two transverses, reduce gradually to the ovality that the center changes its cross section by the pipeline section two ends, become circle or sub-circular up to the pipeline section center cross-sectional, rhombus pipeline section and oval pipeline section be periodic arrangement successively.
2. rhombus thermoexcell according to claim 1 is characterized in that: the shape of cross section of the oval pipeline section at described rhombus pipeline section two ends is standard ellipse or sub-elliptical.
3. rhombus thermoexcell according to claim 1 is characterized in that: the center of rhombus pipeline section two ends cross section and the center of oval pipeline section cross section form normal rhombus pipe on the axis of parent tube; Or on the axis of parent tube, not forming rhomboid pipe, its off-axis is apart from t≤(A-B)/2.
4. according to the described rhombus thermoexcell of the arbitrary claim of claim 1～3, it is characterized in that: the length of described rhumbatron is 1～10 with the ratio of its parent tube inner diameter d; The length of described oval pipeline section is 0.05～1.0 with the ratio of its parent tube inner diameter d; The major axis of oval pipeline section external diameter is 1.1～2.5 with the ratio of its minor axis.
5. rhombus thermoexcell according to claim 4 is characterized in that: the major axis of described oval pipeline section external diameter is 1.3～1.7 with the ratio of its minor axis.
6. rhombus thermoexcell according to claim 4 is characterized in that: the length L t of described circle-oval changeover portion gets Lr/2 〉=Lt 〉=0.1d.
7. rhombus thermoexcell according to claim 6 is characterized in that: the length L t=Lr/2 of described circle-oval changeover portion.
8. rhombus thermoexcell according to claim 1 is characterized in that: comprise the rhombus pipeline section of some lengthenings in whole rhumbatron, the part of this lengthening is positioned at the middle part of this rhombus pipeline section and has circular cross-section.
9. rhombus thermoexcell according to claim 1 is characterized in that: the angle of the crossing is 60 degree or 90 degree between the adjacent ellipses pipeline section major axis.
10. rhombus thermoexcell according to claim 1 is characterized in that: the surfaces externally and internally of described thermoexcell is smooth surface, low rib surface or thread surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031047688A CN1190646C (en) | 2003-02-28 | 2003-02-28 | Rhombic intensified heat exchange tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031047688A CN1190646C (en) | 2003-02-28 | 2003-02-28 | Rhombic intensified heat exchange tube |
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| Publication Number | Publication Date |
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| CN1447089A CN1447089A (en) | 2003-10-08 |
| CN1190646C true CN1190646C (en) | 2005-02-23 |
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| CNB031047688A Expired - Fee Related CN1190646C (en) | 2003-02-28 | 2003-02-28 | Rhombic intensified heat exchange tube |
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2003
- 2003-02-28 CN CNB031047688A patent/CN1190646C/en not_active Expired - Fee Related
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| CN1447089A (en) | 2003-10-08 |
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