CN1455220A - Tubulation and/or sepcial-section tubulation reforced heat exchange tube - Google Patents
Tubulation and/or sepcial-section tubulation reforced heat exchange tube Download PDFInfo
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- CN1455220A CN1455220A CN 03138077 CN03138077A CN1455220A CN 1455220 A CN1455220 A CN 1455220A CN 03138077 CN03138077 CN 03138077 CN 03138077 A CN03138077 A CN 03138077A CN 1455220 A CN1455220 A CN 1455220A
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Abstract
The heat exchange tube comprises of tabulations with different sections: circular tube (base tube), elliptical tube section, oblateness tube section, egg-shaped tube section, the half moon tube section, triangle tube section, transformation tube section and transition tube section. The strengthened heat exchange tube comprises at least three of above said tube sections with other five tube sections being assorted. The different sections can be combined randomly or arranged according to following sequence periodically: circular tube - transition tube - elliptical tube (or oblateness tube, egg-shaped tube, half moon tube, triangle tube) - transformation tube - elliptical tube (or oblateness tube, egg-shaped tube, etc.) - transformation tube - elliptical tube, ect. The combined tube strengthens heat exchange 30-500% but the flow resistance is only raised 20-100%. The invented tube possesses the advantages of not easy of scaling, easy of cleaning and reducing vibration.
Description
Technical field
The thermoexcell that pipeline section and/or pipeline section cross section are abnormal shape/shape belongs to enhanced heat exchange 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.The volume chapter 8 all has introduction more in detail 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 uses " passive facilitation technology " mostly, promptly needn't rely on the energy of heat exchanging fluid itself to reach invigoration effect from the energy outside the extraneous amount of imports (as electric field-enhanced, magnetic field-intensification, vibrating enhanced or the like).If classify from the architectural feature of 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 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 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.
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.
Summary of the invention
The object of the present invention is to provide a kind of pipeline section and/or pipeline section cross section to be the thermoexcell of abnormal shape/shape.
The invention is characterized in that it contains in the following various pipeline section three kinds at least; (1) pipe section: any cross section of pipeline section is circle, belongs to parent tube; (2) oval pipeline section:
The standard ellipse pipeline section: the pipeline section cross section is a standard oval;
The sub-elliptical pipeline section: the pipeline section cross section is the approximate ellipsoidal of four sections camber line matches; (3) oblate pipeline section;
Cross section is that two parallel lines add the oblateness that two circular arcs constitute;
Cross section is the oblateness of multistage camber line match; (4) egg type pipeline section:
Cross section is that a relative little circular arc of orthodrome adds egg type that two transition camber lines couple together or avette;
Cross section is that a relative little circular arc of orthodrome adds egg type that two tangent lines couple together or avette; (5) semilune pipeline section:
Cross section is that a circular arc adds the semilune that straight line constitutes, between circular arc and the straight line by little arc transition;
Cross section is the semilune of multistage camber line match; (6) triangle pipeline section:
Cross section is a triangle, three drift angle arc transition;
Cross section is an equilateral triangle, three drift angle arc transition; (7) distortion pipeline section:
Just be out of shape pipeline section: pipeline section two ends cross section is ellipse or oblateness or egg type or triangle, and intersect certain angle between the two sections symmetry axis, trend towards circle by these pipeline section two ends gradually to the shape of its cross section of center, the cross section of its intersection is circle or sub-circular, and the center of cross section or center of gravity are all on the parent tube axis arbitrarily;
Be out of shape pipeline section partially: pipeline section two ends cross section is ellipse or oblateness or egg type or triangle or semilune, and intersect certain angle between the symmetry axis of two cross sections, trend towards circle by these pipeline section two ends gradually to the shape of its cross section of center, the cross section of its intersection is circle or sub-circular, at least the center of two ends cross section or deviation of gravity center parent tube axis and keep certain distance with the parent tube axis; (8) transitional pipe segment: pipeline section one end cross section is circular, and other end cross section is ellipse or oblateness or egg type or triangle or semilune.
Described thermoexcell is by selecting arbitrarily and combine in the above various pipeline sections.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: for described distortion pipeline section, become (15～90) degree angle to intersect between the symmetry axis of two end sections, be preferably 30 degree and 60 degree;
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: described thermoexcell is by the pipe section after selecting, and---transitional pipe segment---------the distortion pipeline section is arranged the distortion pipeline section by the order of distortion pipeline section---transitional pipe segment---pipe section;
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: described thermoexcell is by the pipe section after selecting, and---transitional pipe segment be---the order periodic arrangement of oval or oblate or egg type or triangle or semilune pipeline section---transitional pipe segment---pipe section.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: described thermoexcell is by the pipe section after selecting, and------------oval or oblate or egg type or triangle pipeline section be---just be out of shape pipeline section---the order periodic arrangement of oval or oblate or egg type or triangle pipeline section---transitional pipe segment---pipe section just to be out of shape pipeline section for oval or oblate or egg type or triangle pipeline section for transitional pipe segment.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: described thermoexcell is by the pipe section after selecting, and------------oval or oblate or egg type or triangle or semilune pipeline section be---be out of shape pipeline section partially---the order periodic arrangement of oval or oblate or egg type or semilune pipeline section---transitional pipe segment---pipe section to be out of shape pipeline section partially for oval or oblate or egg type or triangle or semilune pipeline section for transitional pipe segment.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is; Described converting pipe segment length Lr is 0.2～15 with the ratio of parent tube inner diameter d.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and the length L e that its feature also is described ellipse or oblate or egg type or triangle or semilune pipeline section is 0.2～15 with the ratio of its bore d.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: the ratio of described ellipse or the long and short shaft length of oblate pipeline section external diameter is 1.1～2.5, preferred 1.3～1.7.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: described egg type or semilune pipeline section, and the ratio of the long and short edge lengths of the circumscribed rectangle of its cross section is 1.1～2.5, preferred 1.3～1.7.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: described triangle pipeline section, and leg-of-mutton height and its base length ratio are 1.1～2.5, preferred 1.3～1.7.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature also is: the length L t of described transitional pipe segment is 0.1～7.5 with the ratio of parent tube inner diameter d, is preferably Lt=d/2.
Described pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, and its feature is that also the inner surface of described thermoexcell or outer surface or inside and outside surface are smooth surface or low rib surface or thread surface.
The present invention can provide a kind of heat exchange strengthening effect good, flow that resistance is littler, compressive resistance is high and be convenient to the thermoexcell that heat exchanger is made, it not only can reach the multiple target that strengthens heat exchange, conserve energy, raising heat exchanger economic benefit better than prior art, also has advantages such as less scaling, easy cleaning, minimizing vibration simultaneously.
Description of drawings
Fig. 1: the cross section of shape tube is that two parallel lines add the oblateness that two circular arcs constitute.
Fig. 2: the cross section of shape tube is the oblateness of multistage camber line match.
Fig. 3: the cross section of shape tube is that a relative little circular arc of orthodrome adds egg type that two transition camber lines couple together or avette.
Fig. 4 is that a relative little circular arc of orthodrome adds egg type that two tangent lines couple together or avette.
Fig. 5 is that a circular arc adds the semilune that straight line constitutes, between circular arc and the straight line by little arc transition.
Fig. 6 is the semilune of multistage camber line match.
Fig. 7 is an equilateral triangle, three drift angle arc transition.
Fig. 8 is a triangle, three drift angle arc transition.
Fig. 9 is embodiment 1 a positive shape tube structural representation.
Figure 10 is the E-E view of Fig. 9.
The structural representation of Figure 11 embodiment 2 inclined to one side special pipes.
Figure 12 is the E-E view of Figure 11.
The specific embodiment
The various forms of the cross section of special pipe is seen Fig. 1-8.
Embodiment 1:
Fig. 9 is the structural representation of embodiment 1 positive special pipe.Whole positive special pipe contains distortion pipeline section 1, oval pipeline section 2, transitional pipe segment 3 and 4 compositions of pipe section; Fig. 9 from left to right four kinds of basic pipeline sections according to " the pipe section---transitional pipe segment---oval pipeline section---just be out of shape pipeline section---oval pipeline section---just be out of shape pipeline section---oval pipeline section---transitional pipe segment---pipe section-... " the order periodic arrangement, distortion pipeline section and oval pipeline section are the main bodys of heat exchange.Can increase or reduce the quantity of pipe section during enforcement according to the needs of pipe compressive resistance, the pipe section can be arranged in other appropriate locations according to the needs that deflection plate or rod baffle are installed.
The positive special pipe of embodiment 1 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 that just is being out of shape pipeline section gets Lr/d=2, and each distortion pipeline section is isometric.The length L e of oval pipeline section gets Le/Lr=1, and each oval pipeline section is isometric.Oval pipeline section shape of cross section is that standard ellipse also can be sub-elliptical or oblateness.The ratio of the long and short axle of oval (or oblate) external diameter of pipe is got A/B=1.5.Adjacent two oval pipeline sections have an angle C (see figure 2) between the major axis of its ellipse (oblate), get C and equal 60 degree or 90 degree; 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 pipe section 4 gets 2 times of tube plate thickness, and the two terminal circle pipeline section is isometric.The length L t of transitional pipe segment is isometric, and Lt=d/2.
Embodiment 2:
Figure 11 is the structural representation of the inclined to one side special pipe of embodiment 2.Whole inclined to one side special pipe contains inclined to one side distortion pipeline section 1, oval pipeline section 2, transitional pipe segment 3 and pipe section 4 to be formed.Four kinds of basic pipeline sections according to " the pipe section---transitional pipe segment---oval pipeline section---be out of shape pipeline section partially---oval pipeline section---be out of shape pipeline section partially---oval pipeline section---transitional pipe segment---pipe section-... " the order periodic arrangement.Whole inclined to one side special 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 value of the length L e of the length L o of pipe section, the length L t of transitional pipe segment, inclined to one side converting pipe segment length Lr, oval pipeline section etc. is identical with positive special pipe.The shape of cross section of oval pipeline section is standard ellipse (or sub-elliptical), also can be oblate (or semilune).The ratio A/B of the long and short axle of oval (or 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 embodiment 1 positive special pipe.Different with positive special pipe is: concerning inclined to one side special pipe, wherein the center in the center in each oval pipeline section cross section and distortion cross section, pipeline section two ends 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.
The inside and outside surface of described 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).Multiform pipe with low rib surface is called low positive special pipe of rib and the inclined to one side special pipe of low rib; What have thread surface then is positive special pipe of screw thread and the inclined to one side special pipe of screw thread.Low rib shape tube and screw thread shape tube 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 shape tube 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.
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 30%～500% in the pipe of thermoexcell of the present invention, and corresponding resistance coefficient only increases by 20%～100%, and it also has and well reduces vibration and the dirty performance of resistive connection simultaneously.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, thermoexcell of the present invention 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.
Claims (13)
1. pipeline section and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, contain special-shaped pipeline section, it is characterized in that, it contains in the following various pipeline section three kinds at least:
(1) pipe section: any cross section of pipeline section is circle, belongs to parent tube;
(2) oval pipeline section:
The standard ellipse pipeline section: the pipeline section cross section is a standard oval;
The sub-elliptical pipeline section: the pipeline section cross section is the approximate ellipsoidal of four sections camber line matches;
(3) oblate pipeline section:
Cross section is that two parallel lines add the oblateness that two circular arcs constitute;
Cross section is the oblateness of multistage camber line match;
(4) egg type pipeline section:
Cross section is that a relative little circular arc of orthodrome adds egg type that two transition camber lines couple together or avette;
Cross section is that a relative little circular arc of orthodrome adds egg type that two tangent lines couple together or avette;
(5) semilune pipeline section:
Cross section is that a circular arc adds the semilune that straight line constitutes, between circular arc and the straight line by little arc transition;
Cross section is the semilune of multistage camber line match;
(6) triangle pipeline section:
Cross section is a triangle, three drift angle arc transition;
Cross section is an equilateral triangle, three drift angle arc transition;
(7) distortion pipeline section:
Just be out of shape pipeline section: pipeline section two ends cross section is ellipse or oblateness or egg type or triangle, and intersect certain angle between the two sections symmetry axis, trend towards circle by these pipeline section two ends gradually to the shape of its cross section of center, the cross section of its intersection is circle or sub-circular, and the center of cross section or center of gravity are all on the parent tube axis arbitrarily;
Be out of shape pipeline section partially: pipeline section two ends cross section is ellipse or oblateness or egg type or triangle or semilune, and intersect certain angle between the symmetry axis of two cross sections, trend towards circle by these pipeline section two ends gradually to the shape of its cross section of center, the cross section of its intersection is circle or sub-circular, at least the center of two ends cross section or deviation of gravity center parent tube axis and keep certain distance with the parent tube axis;
(8) transitional pipe segment: pipeline section one end cross section is circular, and other end cross section is ellipse or oblateness or egg type or triangle or semilune;
Described thermoexcell is by selecting arbitrarily and combine in the above various pipeline sections.
2. pipeline section according to claim 1 and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, it is characterized in that: for described distortion pipeline section, become (15～90) degree angle to intersect between the symmetry axis of two end sections, be preferably 30 degree and 60 degree.
3. pipeline section according to claim 1 and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, it is characterized in that: described thermoexcell is by the pipe section after selecting, and---------the distortion pipeline section be---the order periodic arrangement of distortion pipeline section----transitional pipe segment---pipe section for the distortion pipeline section for transitional pipe segment.
4. pipeline section according to claim 1 and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, it is characterized in that: described thermoexcell is by the pipe section after selecting, and---transitional pipe segment be---the order periodic arrangement of oval or oblate or egg type or triangle or semilune pipeline section---transitional pipe segment---pipe section.
5. pipeline section according to claim 1 and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, it is characterized in that: described thermoexcell is by the pipe section after selecting, and------------oval or oblate or egg type or triangle pipeline section be---just be out of shape pipeline section---the order periodic arrangement of oval or oblate or egg type or triangle pipeline section---transitional pipe segment---pipe section just to be out of shape pipeline section for oval or oblate or egg type pipe or triangle pipeline section for transitional pipe segment.
6. pipeline section according to claim 1 and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, it is characterized in that: described thermoexcell is by the pipe section after selecting, and------------oval or oblate or egg type or triangle or semilune pipeline section be---be out of shape pipeline section partially---the order periodic arrangement of oval or oblate or egg type or triangle or semilune pipeline section---transitional pipe segment---pipe section to be out of shape pipeline section partially for oval or oblate or egg type or triangle or semilune pipeline section for transitional pipe segment.
7. be the thermoexcell of abnormal shape/shape according to each described pipeline section and/or pipeline section cross section in the claim 1,3,5,6, it is characterized in that; Described converting pipe segment length Lr is 0.2～15 with the ratio of parent tube inner diameter d.
8. the thermoexcell that is abnormal shape/shape according to each described pipeline section and/or pipeline section cross section in the claim 1,4,5,6, the length L e that it is characterized in that described ellipse or oblate or egg type or triangle or semilune pipeline section is 0.2～15 with the ratio of parent tube inner diameter d.
9. be the thermoexcell of abnormal shape/shape according to each described pipeline section and/or pipeline section cross section in the claim 1,4,5,6, it is characterized in that: the ratio of described ellipse or the long and short shaft length of oblate pipeline section external diameter is 1.1～2.5, preferred 1.3～1.7.
10. the thermoexcell that is abnormal shape/shape according to each described pipeline section and/or pipeline section cross section in the claim 1,4,5,6, it is characterized in that: described egg type or semilune pipeline section, the ratio of the long and short edge lengths of the circumscribed rectangle of its cross section is 1.1～2.5, preferred 1.3～1.7.
11. be the thermoexcell of abnormal shape/shape according to each described pipeline section and/or pipeline section cross section in the claim 1,4,5,6, it is characterized in that: described triangle pipeline section, leg-of-mutton height and its base length ratio are 1.1～2.5, preferred 1.3～1.7.
12. be the thermoexcell of abnormal shape/shape according to claim 1,3,4,5,6 described pipeline sections and/or pipeline section cross section, it is characterized in that: the length L t of described transitional pipe segment is 0.1～7.5 with the ratio of parent tube inner diameter d, is preferably Lt=d/2.
13. pipeline section according to claim 1 and/or pipeline section cross section are the thermoexcell of abnormal shape/shape, it is characterized in that the inner surface of described thermoexcell or outer surface or inside and outside surface are smooth surface or low rib surface or thread surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031380778A CN1190647C (en) | 2003-05-27 | 2003-05-27 | Tubulation and/or sepcial-section tubulation reforced heat exchange tube |
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| CNB031380778A CN1190647C (en) | 2003-05-27 | 2003-05-27 | Tubulation and/or sepcial-section tubulation reforced heat exchange tube |
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| CN1455220A true CN1455220A (en) | 2003-11-12 |
| CN1190647C CN1190647C (en) | 2005-02-23 |
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| CN105387750A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Heat exchange enhanced pipe |
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| CN105387757A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Improved heat exchange enhanced pipe |
| CN105387748A (en) * | 2015-11-25 | 2016-03-09 | 重庆祥吉机械制造有限公司 | Novel heat exchange enhanced pipe |
| CN105651094A (en) * | 2016-03-17 | 2016-06-08 | 郑州大学 | Novel variable-section alternating spiral twisted heat exchange tube |
| CN105890407A (en) * | 2016-05-31 | 2016-08-24 | 中冶焦耐工程技术有限公司 | Self-supporting type contracted-expanded tube heat exchanger and heat exchange method |
| CN105973054A (en) * | 2016-03-25 | 2016-09-28 | 深圳市英维克科技股份有限公司 | Heat exchanger core |
| CN108731513A (en) * | 2018-06-22 | 2018-11-02 | 郑州大学 | A kind of torsion flow tube shell type heat exchanger |
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2003
- 2003-05-27 CN CNB031380778A patent/CN1190647C/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100395506C (en) * | 2004-12-23 | 2008-06-18 | 中国石油化工集团公司 | Tube sheet type heat exchanger |
| CN105387756A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Improved heat exchange enhanced air conditioner |
| CN105387750A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Heat exchange enhanced pipe |
| CN105387753A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Improved heat exchange enhanced radiator |
| CN105387747A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Cross oval section and round face heat exchange enhanced pipe |
| CN105387760A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Heat exchange reinforcement air conditioner |
| CN105387751A (en) * | 2015-11-25 | 2016-03-09 | 重庆祥吉机械制造有限公司 | Novel heat exchange reinforcement water heater |
| CN105387749A (en) * | 2015-11-25 | 2016-03-09 | 重庆祥吉机械制造有限公司 | Novel heat exchange enhanced floor heating system |
| CN105387745A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Improved heat exchange enhanced water heater |
| CN105387755A (en) * | 2015-11-25 | 2016-03-09 | 重庆祥吉机械制造有限公司 | Heat exchange reinforcement radiator |
| CN105387757A (en) * | 2015-11-25 | 2016-03-09 | 重庆市龙山金属材料有限公司 | Improved heat exchange enhanced pipe |
| CN105387748A (en) * | 2015-11-25 | 2016-03-09 | 重庆祥吉机械制造有限公司 | Novel heat exchange enhanced pipe |
| CN105651094A (en) * | 2016-03-17 | 2016-06-08 | 郑州大学 | Novel variable-section alternating spiral twisted heat exchange tube |
| CN105973054A (en) * | 2016-03-25 | 2016-09-28 | 深圳市英维克科技股份有限公司 | Heat exchanger core |
| CN105890407A (en) * | 2016-05-31 | 2016-08-24 | 中冶焦耐工程技术有限公司 | Self-supporting type contracted-expanded tube heat exchanger and heat exchange method |
| CN108731513A (en) * | 2018-06-22 | 2018-11-02 | 郑州大学 | A kind of torsion flow tube shell type heat exchanger |
| CN108731513B (en) * | 2018-06-22 | 2020-07-14 | 郑州大学 | Torsional flow shell-and-tube heat exchanger |
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