CN102483313A

CN102483313A - Free-draining finned surface architecture for a heat exchanger

Info

Publication number: CN102483313A
Application number: CN2010800414007A
Authority: CN
Inventors: M.F.塔拉斯; J.L.埃斯富姆斯; S.S.梅亨戴尔; S.本达普迪; A.A.阿拉亚里; A.乔亚达; M.B.戈尔布诺夫
Original assignee: Carrier Corp
Current assignee: Carrier Corp
Priority date: 2009-09-16
Filing date: 2010-03-31
Publication date: 2012-05-30
Also published as: EP2478318A1; SG179189A1; US20120227945A1; EP2478318A4; IN2012DN00867A; WO2011034633A1

Abstract

A free-draining heat exchanger includes a first heat exchange tube, a second heat exchange tube spaced from and generally parallel to the first heat exchange tube, and a fin contacting the first and second heat exchange tubes. The fin includes a louver and at least one drainage enhancement feature for promoting removal of liquid from external surfaces of the heat exchanger. A free-draining fin structure includes an array of fins disposed between adjacent heat exchange tubes for improving water drainage by reducing liquid surface tension. Each fin in the array includes an opening and a louver for directing airflow through the opening and around the fin and at least one drainage enhancement feature.

Description

The band fin surface that freely the discharges structure that is used for heat exchanger

Background technology

The aluminum micro-channel heat exchanger brings some advantages of conventional copper-aluminium of surpassing once or copper-copper coin pipe plate-fin exchanger and is used in the middle of the number of applications.Yet the aluminum micro-channel heat exchanger also brings new challenge, and effectively condensate drain is one of them.Collected water can be detained at fined tube exchanger aluminium in-core for a long time during being formed on condensate liquid or the stall on the heat exchanger surface between on-stream period.This problem was serious further when industrial out of doors, coastal or marine environment used when heat exchanger, especially appeared to be exposed to the place that high humidity level, frequent rainfall and wind bring sea/foreign-water.Be trapped in the lip-deep water of heat exchanger aluminium and can cause the accelerated corrosion on surface and finally cause critical component (such as heat exchanger tube and manifold) perforation, and damage the joint between heat exchanger tube and the thermofin.

So far, the discharging of aluminum micro-channel heat exchanger improves the evaporimeter of being devoted to be used for air-conditioning and heat pump application particularly, and in these were used, spacing of fin was wide relatively and only have an amount of condensate to need to be continued to remove.These improvement as a rule are unprofitable to the aluminum micro-channel condenser, and it has nearer fin at interval usually, and said nearer fin allows more substantial water to be accumulated in the heat exchanger matrix at interval and hinders condensate drain.The aluminum micro-channel condenser also possibly be submerged owing to the accumulation of Environmental Water or the condensation during the stall, causes to be exposed to water for a long time.Therefore, the retention of the needs of these condensers removal is usually obviously than evaporimeter more (and needing corresponding higher condensate or Environmental Water to remove speed).

Summary of the invention

A kind of heat exchanger that freely discharges comprises first heat exchanger tube, second heat exchanger tube and fin structure.Said second heat exchanger tube is from the spaced apart and almost parallel of said first heat exchanger tube.Said fin structure comprises the fin of said first heat exchanger tube of contact and second heat exchanger tube, is used for promoting to remove liquid from said heat exchanger outer surface.

A kind of fin structure that freely discharges comprises the array of fins that is arranged between the adjacent heat exchange tubes, and being used for provides the reinforcement draining through reducing surface tension of liquid.Each fin in the said array comprises opening and screen (louver), and said screen is used to guide air stream to pass said opening and centers on said fin and screen.

Description of drawings

Fig. 1 is the front view of micro-channel heat exchanger.

Fig. 2 is the perspective view of an embodiment of fin.

Fig. 3 is the front view of heat exchanger tube and fin structure.

Fig. 4 is the heat exchanger tube of Fig. 3 and the perspective view of fin structure.

Fig. 5 is the cutaway view that has the fin structure of the fin that overhangs.

Fig. 5 A has the overhang perspective view of fin structure of fin of recess.

Fig. 6 is the cutaway view that has the fin structure of overhang fin and antelabium.

Fig. 6 A is the perspective view that has the fin structure of overhang fin and antelabium.

Fig. 7 is the cutaway view that has the fin structure of overhang fin and two antelabium.

Fig. 8 is the perspective view that has the heat exchanger tube of curved fins.

Fig. 9 is the perspective view that has the heat exchanger tube of angled fin.

Figure 10 A is the fragmentary, perspective view of micro-channel heat exchanger that has the fin structure of vertical heat exchanger tube and rotation.

Figure 10 B is the exploded view of the rotating fins structure of Figure 10 A.

The specific embodiment

The present invention describes the fin structure with screen and discharging reinforcement characteristic, and it provides the improved fluid discharge in the heat exchanger.This fin structure allows water more easily to discharge and improved from the heat exchanger outer surface and removes water.The pipe wing heat exchanger of any kind is all worked this fin structure and especially the aluminum micro-channel condenser is useful to the aluminum micro-channel heat exchanger especially.Though specific embodiment is described with reference to the aluminum micro-channel heat exchanger, the present invention also can manage the wing heat exchanger for other benefit is provided.The aluminum micro-channel heat exchanger has than other heat exchangers compact structure more usually.Typical spacing of fin changes between every centimetre of about 5.5 fin (14 fin per inch) and about 9.1 fins every centimetre (23 fin per inch), and typical heat exchanger tube spacing changes between about 0.5 centimetre (0.19 inch) and about 1.0 centimetres (0.39 inch).Because this tight fin and tube pitch and aluminum design are linked together, it is vital for the aluminum micro-channel heat exchanger, dewatering.

Fig. 1 illustrates an example of aluminum micro-channel heat exchanger.Heat exchanger 20 can be aluminum or aluminium alloy and comprise first manifold 22, and said first manifold 22 has inlet 24 and outlet 26, and inlet 24 is used to receive working fluid (such as cooling agent or cold-producing medium), and outlet 26 is used to discharge this working fluid.First manifold, 22 fluids are connected to each in a plurality of heat exchanger tubes 28, and each all is connected said a plurality of heat exchanger tube 28 with second manifold, 30 fluids on the opposite end.Second manifold 30 is connected with each fluid in a plurality of heat exchanger tubes 32, and said a plurality of heat exchanger tubes 32 turn back to first manifold 22 to discharge through outlet 26 with working fluid.Usually,

heat exchanger tube

28 and 32 each all comprise flow channel or the path that is used for the transportation work fluid, so-called microchannel or mini passage (not shown).Heat exchanger tube 28 is the same with 32 structure in essence; It is the direction difference that working fluid flows.In this application, usually with reference to heat exchanger tube 28 so that design of the present invention to be shown.Same design can be applied to heat exchanger tube 32 with being equal to.Dividing plate 23 is positioned at first manifold 22 to separate the entrance and exit part of first manifold 22.Round trip working fluid flow structure recited above is merely one of numerous possible design arrangement.Can be through with dividing plate 23, inlet 24 with export 26 ad-hoc locations that are placed in first manifold 22 and second manifold 30 and realize one way or other multipass fluid flow structure.Various other working fluid flow structures also are possible, but not crucial for understanding the present invention.As shown in fig. 1, fin 34 extends between heat exchanger tube 28.Fin 34 supports heat exchanger tubes 28 and between heat exchanger tube 28, sets up (for example, being used for air stream) open flow channel.Fin 34 mechanically and/or chemically and/or hot link to heat exchanger tube 28.A plurality of fins 34 can link together to constitute a continuous fin structure 36.Fin 34 can have screen, and what it was used to flow is redirected and augmentation of heat transfer.

According to the present invention, fin 34 and fin structure 36 are arranged to improve and optimize the draining characteristics of heat exchanger 20.Fin 34 and fin structure 36 influence the running of heat exchanger 20 with three kinds of main modes.At first, fin 34 and fin structure 36 help in heat exchanger tube 28 in the flowing process fluid and the space between adjacent heat exchanger tube 28 to pass through heat exchanger tube 28 and fin 34 heat transfer between the air of heat exchanger 20.The second, fin 34 influences the pressure drop on the heat exchanger 20 with fin structure 36.This pressure drop reduce through and around the air stream of heat exchanger 20, aspect heat transfer, negative effect is arranged then.The 3rd, fin 34 is prepared for draining with fin structure 36.Fin 34 and fin structure 36 are set to anti-sealing and are detained by the aluminium of heat exchanger 20 surface and allow water to discharge from the outer surface of heat exchanger 20 effectively.Therefore, through discharge characteristics efficiently is provided, fin 34 has reduced the hydropexis in the fin structure 36 and has reduced pressure drop for heat exchanger 20 Effect on Performance with fin structure 36.Fin used in the heat exchanger of prior art is just considered to optimize with conducting heat for pressure drop usually.Yet fin 34 provides improved draining for heat exchanger 20 with fin structure 36 under the situation of the performance of significantly not damaging pressure drop and heat compensator conducting property or heat exchanger 20.

Fig. 2 illustrates the part perspective view of an embodiment of fin 34.Fin 34 can be aluminium or aluminium alloy.Fin 34 comprises fins 38, screen 40 and screen opening 42.As shown in Figure 2, fins 38 generally is plane and rectangular shape.In other embodiments, fins 38 can be crooked, can be segmentation perhaps, has angled different piece.The civilian more detailed description example crooked and angled fins 38 in the back.The first 44 and second portion 46 of fins 38 longitudinal extensions to form fin 34.

As shown in Figure 2, fin 34 comprise the first screen 40a related with first 44 and with the second related screen 40b of second portion 46.Screen 40 generates screen opening 42 so that emission path to be provided in fins 38, be used to the aluminium surface that guides water to leave fin 34 and leave heat exchanger 20 on the whole.As shown in Figure 2, screen 40 is in the tilted angle and departs from fins 38, generates screen opening 42.So in the diagram, two cover screens 40 (40a and 40b) all are in the tilted angle and make them open away from the center of fins 38.Screen 40 also can be set make them on the leading edge of fin 34 or single direction, be in the tilted angle and open, or be in the tilted angle and make them open towards the center of fins 38 away from the leading edge of fin 34.Between heat exchanger 20 on-stream periods, air is flowing around fin 34 and the screen 40 and is passing screen opening 42 with the heat transfer between the air stream of strengthening fin 34 and process heat exchanger 20 usually.Screen 40 guiding air flow to screen opening 42 and pass screen opening 42 along the surface of fins 38.Pass and leave heat exchanger 20 through guiding water, the air stream that passes heat exchanger 20 helps external aluminium surface removal Environmental Water or the condensate from heat exchanger 20.Fin 34 and fin structure 36 also comprise at least one discharging reinforcement characteristic provides improved draining to reduce or not have air to flow under the situation of passing heat exchanger 20 at the air stream that passes heat exchanger 20.Various dischargings are strengthened characteristic and can be comprised greater than about 50 ° screen angle, recess, the edge that overhangs, decline antelabium, bending, angle and combination thereof, and after will being specified in.

Screen 40 can stretch out from fins 38 with big relatively screen angle (between the plane of the plane of screen 40 and fins 38, measuring).Be adapted at providing in the wet environment screen angle of abundant discharging can be between about 45 ° and about 75 °, about 50 ° especially be suitable as discharging to about 60 ° screen angle and strengthen characteristic.Fin 34 with big relatively screen angle is suitable for heat exchanger tube 28, and no matter heat exchanger tube 28 is flatly to arrange, arrange vertically, still is arranged in vertically and any position between the horizontal alignment.Screen 40 and and then screen opening 42 have width and about 2 mms of about 0.5 mm (0.0197 inch) between about 1.8 mm (0.071 inch) usually to the height between about 10 mm (0.0787 inch to 0.394 inch).On fin 34, screen 40 common spaced apart about 0.7 mm (0.0276 inch) in succession are to about 2 mm (0.0787 inch).Big relatively screen angle and screen opening 42 width have improved the discharge capacity of fin 34.Because the screen angle is big relatively, the lip-deep condensate that appears at fin 34 flows away from fin surface with other water more easily.Water mobile receives gravity and around screen opening 42 and the help of passing any air stream of screen opening 42.Big relatively screen angle has significantly reduced the potential water surface tension effect along fin 34, thereby hinders the hydropexis of fin surface.Owing to lower surface tension, gravity provides enough substantially power alone so that from screen 40 and fin 34 drainings.According to the orientation of fin 34, can water be discharged to the second lower fin 34 or be discharged to lower heat exchanger tube 28 to remove then from first fin 34 through gravity and/or air stream.Air stream further through along fins 38 with water lead downstream screen 40 and screen opening 42 and lead on the outer surface of heat exchanger tube 28 and further strengthen discharging.

A plurality of fins 34 can connect together to form fin structure 36.Fig. 1 illustrates by a plurality of fins 34 and links together with wavy mode and the continuous fin structure 36 that constitutes.The V-arrangement pattern that fin 34 is set to replace repeatedly.Fin structure 36 can be made up of the from one piece with a plurality of fins 34, and the shape of fin structure 36 is configured to be engaged between the heat exchanger tube 28.Continuous fin structure 36 like this can be configured and suitably be positioned between the heat exchanger tube 28 and in one or more positions mechanically or chemically attached (for example, welding, brazing, soldering or gummed) to heat exchanger tube 28.Alternatively, independent fin 34 can be connected to heat exchanger tube 28 or be connected to other fins 34 through similar techniques (welding, brazing, soldering or the like).

Fig. 3 and Fig. 4 illustrate continuous fin structure 36, and said fin structure 36 has between near " sharp " edge fin 34 and the heat exchanger tube 28 and is parallel to and adjacent to the surface of heat exchanger tube 28.Usually, fin structure 36 can have the shape of crooked, shape avette or sine wave type or sharp edge type.Embodiment shown in Fig. 3 and Fig. 4 provides the draining potentiality along the surface tension of the reduction of fin structure 36 and reinforcement.Fig. 3 and Fig. 4 illustrate the fin structure 36 that has a series of wavy geometries.In this embodiment, fin structure 36 is configured to form a series of types of trapezoidal shapes that have fin 34 and parallel fin structure part 50.Between adjacent fin 34, fin structure 36 comprises the series of parallel fin structure part 50 that is parallel to heat exchanger tube 28 extensions haply.Parallel fins structure division 50 is provided with fin 34 to constitute sharp edge at corner 52 places and to eliminate gap and little space possible between heat exchanger tube 28 and crooked, avette or sinusoidal fin structure in fin structure 36.Like Fig. 3 and shown in Figure 4, by the formed corner 52 of the sharp edge of trapezoidal fin structure 36 have possibility near but not exclusively reach 90 ° angle (being that fin 34 is not orthogonal to heat exchanger tube 28).Other geometries such as rectangle, also can be used to form near the sharp edge at corner 52 places the heat exchanger tube 28.When fin structure 36 formed rectangle, fin 34 was usually perpendicular to heat exchanger tube 28.

With near 90 ° angle, the sharp corners 52 of fin structure 36 has been eliminated existing little space between curved edge (not shown) and the heat exchanger tube 28 of sinusoidal fin structure for example.These little spaces that formed by the curved fins structure allow water surface tension with this little space of water suction, and there, it can gather and become and be difficult to lean on separately gravity or even utilize the air stream that passes heat exchanger 20 to remove.Sharp corners 52 minimizes capturing of water between fin structure 36 and the heat exchanger tube 28.For example, sharp corners 52a does not allow water to be captured between fin 34 or parallel fins structure division 50 and the heat exchanger tube 28.The angle of sharp corners 52a is enough big, makes that any water of sharp corners 52a periphery all can be owing to gravity flows down rather than is captured between fin 34 and the heat exchanger tube 28 along fin 34.Because water leaves from sharp corners 52a, so guided the air stream that passes through heat exchanger tube 28 and pass fin structure 36 to remove more easily.Therefore, sharp corners 52a provides and can let the not surface tension potential energy of captive reduction of water.On the other hand, crooked fin structure provides the upper surface of fin structure and the little space between the heat exchanger tube 28, and the surface tension of water can be captured water between the upper surface of fin structure and heat exchanger tube 28 there.

52a is similar with sharp corners, and sharp corners 52b provides enough big angle to make water be not easy to be captured between fin structure 36 and the heat exchanger tube 28.Not to help to remove water (for the heat exchanger tube 28 of horizontal aligument) here from sharp corners 52b through gravity; But; The fin 34 at sharp corners 52b place and the wide-angle between the heat exchanger tube 28 allow air stream to guide any water that accumulates in the sharp corners 52b to arrive (flowing with respect to air) downstream edge until it along the surface of heat exchanger tube 28, and here water is removed from heat exchanger tube 28.The fin 34 at sharp corners 52 places and the wide-angle between the heat exchanger tube 28 are unlike the air stream of the such restriction in less space along sharp corners 52b.

Fig. 4 illustrates the heat exchanger tube 28 of Fig. 3 and the perspective view of fin structure 36.Fig. 4 has provided the different views of the fin structure 36 that has screen 40 and screen opening 42.In the embodiment shown, the fin 34 of fin structure 36 and the width of parallel fin structure part 50 equal the width of heat exchanger tube 28.Among other embodiment that detail in addition in the back, fin 34 and the width of parallel fin structure part 50 are different from the width of heat exchanger tube 28.

Fig. 4 also illustrates the recess 54 that is included in the fin structure 36.Recess 54 has been represented such zone of fin structure 36, and there, the part of structural material is perhaps otherwise removed by excision from fin structure 36, perhaps in fin structure 36, has generated gap, slit or perforate.Recess 54 can be positioned at (as shown in Figure 4) on the fin 34, is positioned at (shown in Fig. 5 A) on the parallel fins structure division 50, or is positioned in its both combination.When being positioned at the 34 last times of fin that are arranged on the horizontal heat exchange tube 28, recess 54 preferably is positioned on the base section of fin 34 (to allow water more freely along the apparent motion of heat exchanger tube 28).Other also allow recess 54 is positioned to be adjacent to the both sides of heat exchanger tube 28 about heat exchanger tubes of gravity 28 orientations (and above-mentioned horizontal alignment).As shown in Figure 4, recess 54 generates the opening in the fin 34 in the place that fin 34 links heat exchanger tube 28.Recess 54a and 54c are positioned on the transverse edge of fin structure 36.In the case,

recess

54a and 54c are positioned on the fin 34, are in respectively in the first 44 and second portion 46 of fins 38.Recess 54b is positioned near the center of fin 34.The combination that can have a recess 54 or some recesses 54 to be improving the motion of water or condensate, and thereby improves along the air stream on heat exchanger tube 28 surfaces.The accurate position of each recess 54, the size of recess 54 and quantity depend on concrete fin structure and size.For the typical micro-channel heat exchanger of current use in air-conditioning and refrigeration industry, the quantity of recess 54 can be between 1 and 5.In addition, the length range of recess 54 can be between about 3 mm (0.118 inch) and about 32 mm (1.26 inches) and the altitude range of recess 54 can be between about 1 mm (0.039 inch) and about 5 mm (0.197 inch).Though the recess structure of rectangle only is shown among Fig. 4, other recess shape, such as avette, oval, track shape, trapezoidal and triangle, also be feasible also within the scope of the invention.

Recess 54 also reduces the surface tension in the fin structure 36 and improves draining.Water even less might accumulate in the sharp corners 52 at recess 54 places.In fin 34 has the zone of opening; Water is not easy to accumulate, because three surfaces (heat exchanger 28, fin 34 and parallel fin structure part 50) that it only contacts with two surfaces (heat exchanger tube 28 and parallel fin structure part 50) rather than prior art is constructed.In addition, recess 54 for pass fin structure 36 and on heat exchanger tube 28 air flowing stream other flow path is provided.This other flow path allows air stream to guide water to leave heat exchanger tube 28 and fin structure 36 better, thereby improves draining.

Fig. 5 illustrates the cutaway view of the fin structure 36 that has the transverse edge that overhangs.Fin structure 36 comprises fin 34, screen 40, screen opening 42, first edge 62 that overhangs, edge 60 and second that overhangs.As stated, fin structure 36 can be single continuous part or a series of fin 34 that does not connect that has parallel fins structure division 50.Work as described above in screen 40, screen opening 42 and parallel fin structure surface 50.But, unlike the fin structure shown in Fig. 4 36, the fin structure 36 shown in Fig. 5 comprises first and

second overhang edge

60 and 62, its respectively horizontal expansion surpass the transverse edge of heat exchanger tube 28.Through the transverse edge (

edge

60 and 62 overhangs) of fin 34 being extended beyond the transverse edge of heat exchanger tube 28, improve from the draining of fin structure 36 and heat exchanger tube 28.For example, the water that occur in the fin structure 36 can under the situation of contact heat-exchanging pipe 28 not by heat exchanger tube 28 and fin structure 36 between the air stream guiding of process leave fin structure 36.Water can be advanced along fin 34 and lower parallel fins structure division 50b.Through extending beyond the transverse edge of heat exchanger tube 28, first and

second edges

60 and 62 that overhang allow water to advance at the edge of the situation lower edge fin structure 36 of contact heat-exchanging pipe 28 not.In case water arrives first or

second overhang edge

60 or 62 or the transverse edge of lower parallel fins structure division 50b, gravity and/or air stream just make water and on the direction of leaving heat exchanger tube 28, discharge downwards.This has prevented water gathered and caused then exchanging the surface of heat pipe 28 along the surface area of heat exchanger tube 28 corrosion.First and

second edges

60 and 62 that overhang can extend beyond the transverse edge different distances of heat exchanger tube 28, preferably, extend beyond the bigger distance of transverse edge of heat exchanger tube 28 about the edge that overhangs, the downstream of air stream.If first and second edges 60 that overhang are identical with 62 both distances of extending beyond the transverse edge of heat exchanger tube 28; Then heat exchanger 20 is symmetrical about the orientation of air stream; Make that any transverse edge of heat exchanger tube 28 can be leading edge (that is, air stream can pass through heat exchanger 20 on arbitrary direction).

In addition, condensate collected on the outer surface of heat exchanger tube 28 can be extracted into

overhang edge

60 and 62 by surface tension, helps to reduce condensate and is detained.Fin structure 36 can only have the edge 60 that overhangs, preferably in the downstream about flow air stream on heat exchanger tube 28 and the fin structure 36.For currently used micro-channel heat exchanger, fin 34 overhang size usually between about 3 mm (0.118 inch) and about 10 mm (0.394 inch).

Overhang edge

60 and 62 can with 54 combinations of the recess of Fig. 4.Fig. 5 A illustrates the perspective view of the fin 34 at the edge 60 that overhangs with band recess.From Fig. 5 A, omitted screen 40 so that the edge 60 that overhangs of band recess to be shown better.The fin 34 that should understand the edge 60 that overhangs with band recess can comprise screen 40.In one embodiment, recess 54 is positioned at the middle part of the parallel fins structure division 50 at the edge 60 that overhangs.In another embodiment, recess 54a is positioned at the intersection of fin 34a separately with the parallel fin structure part 50a of overhang edge 60a and 60b.Therefore; Recess 54 can be positioned on the parallel fins structure division 50; Be positioned at (for example, side rather than bottom) on the fins 38 of fin 34 or be positioned in said both combination (part excision of a part and parallel fin structure part 50 that is about to fins 38 is with at the intersection of fins 38 and parallel fin structure part 50 formation recess).

Fig. 6 illustrates the cutaway view of the fin structure 36 that has overhang a transverse edge and a decline antelabium.Fin structure 36 comprises fin 34, screen 40, screen opening 42, edge 60 and decline antelabium 64 overhang.As stated, fin structure 36 can be single continuous part or a series of disjunct fin 34 with parallel fins structure division 50.Screen 40, screen opening 42, parallel fins structure division 50 and overhang edge 60 as stated.As shown in Figure 6, edge 60 horizontal expansions that overhang surpass the right transverse edge of heat exchanger tube 28.In addition, the edge 60 that overhangs is connected to from the edge 60 that overhangs to the decline antelabium 64 that extends below and is connected to a side of heat exchanger tube 28.Decline antelabium 64 can be to extend with the fin 34 and the edge 60 same angles that overhang.Alternatively, decline antelabium 64 can extend with downward or other roughly downward angles from the edge 60 that overhangs.

Overhang edge

60 and 64 cooperations of decline antelabium to improve the draining from fin structure 36.Water is crossed the fin 34 or the parallel fins structure division 50b of fin structure 36 through the air stream guiding of heat exchanger tube 28 and fin structure 36.In case water arrives the transverse edge of overhang edge 60 or lower parallel fins structure division 50b, advance downwards in the water edge 60 that just overhangs in the help lower edge of gravity.When existing seldom on heat exchanger tube 28 and the fin structure 36 or do not have air stream, decline antelabium 64 still improves draining.Heat exchanger tube 28 possibly left because water surface tension and the water of contact heat-exchanging pipe 28 are lowered by antelabium 64 and guide downwards in the transverse edge vicinity of parallel fins structure division 50b.Decline antelabium 64 can overlap each other, and perhaps can have the gap that line contacted or had space between adjacent decline antelabium 64.Decline antelabium 64 can be related with each fin 34 or alternatively only with AD HOC (for example, per three fins, per four fins, or the like) some fin 34 association.

Fig. 6 A illustrates the perspective view of the fin structure 36 that has overhang edge 60 and decline antelabium 64a and 64c.From Fig. 6 A, omitted screen 40 so that overhang edge 60 and decline

antelabium

64a and 64c to be shown better.Should be understood that the fin 34 that has overhang edge 60 and decline

antelabium

64a and 64c can comprise screen 40.Fin 34a and 34c comprise

overhang edge

60a and 60c respectively.

Overhang edge

60a and 60c laterally extends beyond the edge of heat exchanger tube 28.The fins 38 that

fin

34b and 34d do not have overhang edge 60 and fin 34b and a 34d does not laterally extend beyond the edge of heat exchanger tube 28.

Decline antelabium

64a and 64c are positioned to be adjacent to overhang edge 60a and 60c.The part of

decline antelabium

64a and 64c is extended from

overhang edge

60a and 60c on the direction that is roughly parallel to parallel fins structure division 50.Other parts of

decline antelabium

64a and 64c are to extending below.

Decline antelabium

64a and 64c are usually located at the downstream of heat exchanger tube 28, but also can be positioned at the upstream side of heat exchanger tube 28.

Decline antelabium

64a and 64c help water is walked from fin structure 36 guiding through impelling water on roughly downward direction, to flow.In one embodiment, decline

antelabium

64a and 64c are through following mode form: the fins 38 of cutting

fin

34b and 34d and the part of parallel fins structure division 50 also form

decline antelabium

64a and 64c with the fins of being cut 38 bending on downward direction.

Fig. 7 illustrates the cutaway view of the fin structure 36 that has two overhang

transverse edge

60a and 60b and two decline antelabium 64a and 64b.Have the cross section of rectangle haply though decline

antelabium

64,64a and 64b are shown as, any other cross section is such as trapezoidal, leg-of-mutton or crooked also can accepting and can benefit from the present invention equally.

Fig. 8 illustrates the perspective view of the fin structure 36 with curved fins 34.Fin structure 36 with heat exchange of top part pipe 28 for being shown in dotted line, so that the element of curved fins structure 36 to be shown better.As shown in Figure 8, fin structure 36 comprises fin 34, screen 40 and screen opening 42.Fin structure 36 can also comprise that (fin 34a comprises recess 54 to recess 54; Fin 34b does not comprise recess 54).Screen 40, screen opening 42 and recess 54 are as stated.Fin structure 36 can be provided with about heat exchanger tube 29 as shown in Figure 8, and the plane that wherein forms between every end of fin 34 is approximately perpendicular to the longitudinal axis of heat exchanger tube 28 (fin structure 36a).Alternatively, fin structure 36 can be rotated so that better drainage performance to be provided.Fin structure 36 can be rotated into and guide air stream to pass heat exchanger 20 to remove water from heat exchanger tube 28 (fin structure 36b) better.In VERTICAL TUBE was arranged, fin structure 36 can be rotated to improve the draining of gravity effect.The rotation of curved fins structure 36 can be used for the hot property and the drooping characteristic of balance draining demand and heat exchanger 20.Fin structure 36 can as shown in Figure 8ly be made up of independent fin 34, or is made up of the fin 34 that is interconnected at together through parallel fins structure division 50, as stated.

Fig. 9 illustrates the perspective view of the fin structure 36 that has angled fin.Fin structure 36 with heat exchange of top part pipe 28 for being shown in dotted line, so that the element of angled fin structure 36 to be shown better.As shown in Figure 8, fin structure 36 comprises two or more fin sections 66, screen 40 and screen opening 42.Fin structure 36 can also comprise recess 54 (fin structure 36a does not comprise recess 54, and fin structure 36b comprises recess 54).Screen 40, screen opening 42 and recess 54 are as stated.Similar with the embodiment shown in Fig. 8, angled fin structure 36 can be rotated to improve draining.Fin structure 36a comprises two fin section 66a and

66b.Fin section

66a and 66b interconnect (being that

fin section

66a and 66b are not parallel) with an angle.Angle between fin section 66a and the 66b can according to the orientation of heat exchanger tube 28 (be level or vertical, or any position therebetween) and heat exchanger 20 on the expectation pressure drop and change.Proper angle between fin section 66a and the 66b comprises the angle between about 100 ° and about 170 °.Each

fin section

66a and 66b have screen 40 and screen opening 42.Fin structure 36b comprises three fin section 66c, 66d and 66e.Fin section 66d comprises recess 54.The rotation of angled fin structure 36 can be used for the hot property and the drooping characteristic of balance draining demand and heat exchanger 20.Fin structure 36 can as shown in Figure 9ly be made up of independent fin 34, or is made up of the fin 34 that is interconnected at together through parallel fins structure division 50, as stated.And, though bending shown in Fig. 8 and Fig. 9 and angled fin structure 36, also can comprise one in overhang edge 60 and the decline antelabium 64 or the two as stated through himself having reduced the condensate surface tension.

Figure 10 A is the part perspective view with micro-channel heat exchanger of VERTICAL TUBE.Shown in the part of heat exchanger 20 clipped, so that heat exchanger tube 28 and fin structure 36 to be shown better.Figure 10 B is the exploded view of the fin structure 36 of Figure 10 A.Fin structure 36 comprises the fin 34 with screen 40 and screen opening 42.Screen 40 is described as above with screen opening 42.The distinctive feature of the fin structure 36 shown in Figure 10 A and Figure 10 B is with fin structure 36 half-twists when fin structure 36 being assembled and be integrated in the heat exchanger 20.The fin 34 of fin structure 36 forms along the wavy pattern of the longitudinal axis of heat exchanger tube 28.This just allows condensate under the gravity effect, to arrange from fin structure 36 naturally.Every other characteristic recited above also can be included in such design.Screen opening 42 can be designed and limit size to obtain the suitable Pressure Drop Characteristics of heat exchanger 20 with possible extra recess 54.

Although the present invention has been described, those skilled in the art will appreciate that under the situation that does not deviate from the scope of the invention and can make various changes, and available equivalents replaces its element with reference to example embodiment.In addition, under the situation that does not deviate from its essential scope, can make many modification to adapt to concrete situation or material to instruction of the present invention.Therefore, anticipate and seek for, the invention is not restricted to disclosed specific embodiment, but the present invention will comprise falling all embodiment within the scope of the appended claims.

Claims

1. one kind is freely discharged heat exchanger, comprising:

First heat exchanger tube;

Second heat exchanger tube of and almost parallel spaced apart with said first heat exchanger tube; And

Contact the fin of said first and second heat exchanger tubes, said fin comprises:

Screen;

Characteristic is strengthened at least one discharging, is used to promote the outer surface from said heat exchanger to remove liquid.

2. the heat exchanger that freely discharges as claimed in claim 1; Wherein, said at least one discharging reinforcement characteristic is selected from the group of following composition: greater than the fin structure and the combination thereof of 45 ° screen angle, recesses, the edge that overhangs, decline antelabium, bending, angle, rotation.

3. the heat exchanger that freely discharges as claimed in claim 1, wherein, said screen has the screen angle between 45 ° and about 75 °.

4. the heat exchanger that freely discharges as claimed in claim 1, wherein, said first heat exchanger tube comprises first transverse edge, and wherein, said fin also comprises:

First edge that overhangs, it extends beyond said first transverse edge of said first heat exchanger tube.

5. the heat exchanger that freely discharges as claimed in claim 4, wherein, said first edge that overhangs extends beyond about 3 mm of said first transverse edge of said first heat exchanger tube and the distance between about 10 mm.

6. the heat exchanger that freely discharges as claimed in claim 4, wherein, said fin also comprises:

From the said first first decline antelabium that the edge extends that overhangs.

7. the heat exchanger that freely discharges as claimed in claim 6, wherein, the said first decline antelabium comprises the cross section of from the group of following composition, selecting: rectangle, trapezoidal, leg-of-mutton, crooked and combination.

8. the heat exchanger that freely discharges as claimed in claim 6 also comprises:

The 3rd heat exchanger tube; And

Contact second fin of the said second and the 3rd heat exchanger tube, said second fin comprises:

Second edge that overhangs, it extends beyond said first transverse edge of said first heat exchanger tube; With

From said second second drop edge that the edge extends that overhangs, wherein, the part of the said first decline antelabium and the said second decline antelabium a part of overlapping.

9. the heat exchanger that freely discharges as claimed in claim 6 also comprises:

The 3rd heat exchanger tube; And

From the said second second decline antelabium that the edge extends that overhangs, wherein, the said second decline antelabium is from the spaced apart gap of the said first decline antelabium.

10. the heat exchanger that freely discharges as claimed in claim 1, wherein, said first heat exchanger tube is included in first transverse edge and second transverse edge on the opposite side of said first heat exchanger tube, and wherein, said fin also comprises:

First edge that overhangs, it extends beyond said first transverse edge of said first heat exchanger tube; With

Second edge that overhangs, it extends beyond said second transverse edge of said first heat exchanger tube.

11. the heat exchanger that freely discharges as claimed in claim 10; Wherein, said first overhang said first transverse edge that the edge extends beyond said first heat exchanger tube overhangs than said second that to extend beyond said second transverse edge of said first heat exchanger tube farther at the edge.

12. the heat exchanger that freely discharges as claimed in claim 10, wherein, said fin also comprises:

From the said first first decline antelabium that the edge extends that overhangs; With

From the said second second decline antelabium that the edge extends that overhangs.

13. the heat exchanger that freely discharges as claimed in claim 1 also comprises:

Contact second fin of said first and second heat exchanger tubes; With

Connect said fin and said second fin and be parallel to and contact the parallel portion of one of said first or second heat exchanger tube substantially.

14. the heat exchanger tube that freely discharges as claimed in claim 13, wherein, said fin, said second fin and said parallel portion are formed by a continuous material.

15. the heat exchanger that freely discharges as claimed in claim 13, wherein, said parallel portion formation has the sharp corners of said fin to reduce surface tension of liquid.

16. the heat exchanger that freely discharges as claimed in claim 13, wherein, said fin is included in the recess that is adjacent to said parallel portion office on the said fin.

17. the heat exchanger that freely discharges as claimed in claim 16, wherein, said recess is crossed over the edge of said fin.

18. the heat exchanger that freely discharges as claimed in claim 16, wherein, said recess is crossed between the edge of said fin but is not comprised the zone of said fin at the edge of said fin.

19. the heat exchanger that freely discharges as claimed in claim 16, wherein, said recess comprises the cross section of from the group of following composition, selecting: avette, rectangle, trapezoidal, leg-of-mutton, oval-shaped, track shape and combination.

20. the heat exchanger that freely discharges as claimed in claim 16, wherein, said fin comprises between an about recess and about five recesses, and wherein, and each recess has length and the height between about 1 mm and about 5 mm between about 3 mm and about 32 mm.

21. the heat exchanger that freely discharges as claimed in claim 14; Wherein, said fin also comprises first edge that overhangs, and said first edge that overhangs extends beyond said first transverse edge of said first heat exchanger tube; And wherein; Said second fin comprises second edge that overhangs, and said second edge that overhangs extends beyond said first transverse edge of said first heat exchanger tube, and wherein; Said parallel portion comprises the 3rd edge that overhangs, and the said the 3rd edge that overhangs extends beyond said first transverse edge of said first heat exchanger tube.

22. the heat exchanger that freely discharges as claimed in claim 21, wherein, the said the 3rd edge that overhangs comprises recess.

23. the heat exchanger that freely discharges as claimed in claim 21 also comprises:

Be positioned at the said first and the 3rd overhang the edge the recess of intersection.

24. the heat exchanger that freely discharges as claimed in claim 21, wherein, said first overhang the edge from said fin separately and downwarping be adjacent to the decline antelabium of said second fin with formation.

25. the heat exchanger that freely discharges as claimed in claim 1, wherein, said fin has bending.

26. the heat exchanger that freely discharges as claimed in claim 25, wherein, said fin comprises and is adjacent to said first or the recess of second heat exchanger tube.

27. the heat exchanger that freely discharges as claimed in claim 1, wherein, said fin comprises:

The first fin section; With

Be connected to the second fin section of the said first fin section, wherein, said first fin section and the said second fin section form the angle between about 100 ° and about 170 °.

28. the heat exchanger that freely discharges as claimed in claim 27, wherein, the said first fin section comprises and is adjacent to said first or the recess of second heat exchanger tube.

29. the heat exchanger that freely discharges as claimed in claim 1 also comprises:

Contact a plurality of fins of said first and second heat exchanger tubes, wherein, adjacent fin is connected to form along the wavy pattern of the longitudinal axis of said first and second heat exchanger tubes.

30. a fin structure that freely discharges comprises:

Be arranged in the array of fins between the adjacent heat exchange tubes, be used for through reducing surface tension of liquid the reinforcement draining being provided, each fin in the said array of fins comprises:

Opening;

Be used to guide air stream to pass the screen that said opening also centers on said fin; And

Characteristic is strengthened at least one discharging.

31. the fin structure that freely discharges as claimed in claim 30; Wherein, said at least one discharging reinforcement characteristic is selected from the group of following composition: greater than the fin structure and the combination thereof of 45 ° screen angles, recess, sharp corners, the edge that overhangs, decline antelabium, bending, angle, rotation.

32. the fin structure that freely discharges as claimed in claim 30 also comprises:

The parallel portion that connects the adjacent fins in the said array is used for engaging with heat exchanger tube.

33. the fin structure that freely discharges as claimed in claim 30, wherein, said screen has the screen angle greater than 45 °.