CN1188889A - Pipe for heat exchanger - Google Patents

Abstract

The invention provides tubes for a heat exchanger having a higher corrosion resistance and capable of contributing to a longer life of the heat exchanger, the tubes having recesses resulting from beads or grooves formed on the upper and lower tube walls. Tubes for the heat exchanger, each tube being formed by bending a sheet of plate or by joining two sheets of plates, wherein the tube 2 is formed with a plurality of beads 11A, 11B, the top of each bead being joined with the surface of the opposite tube wall to form a plurality of divided passages in the tube. Of the beads 11A and 11B, at least one bead located on the most upstream side of the air flow projects upwardly from the lower tube wall.

Description

Heat exchanger pipe

The present invention is used for relevant to the inner flange that is provided with a plurality of streams of formation of pipe, and is provided with the flat tube for heat exchanger of recess in the tube outside, especially can be used for the circulation along with air, can reduce the residual grit at pipe upside recess; Thereby improve the structure of its corrosion resistance.

We know, general multilayered heat exchanger, and its structure is to adopt a plurality of flat tubes to parallel lamination, the both ends of each flat tube is connected with two radiating tubes, and on the radiating tube assigned position, is respectively equipped with to discharge and the exit port connector of injection.This heat exchanger, it is injecting the heat exchange media in the heat exchanger, carries out heat exchange with ventilating air by each flat tube outside, carrying out between radiating tube repeatedly goes in ring refluxes and discharges.

The flat tube that this multilayered heat exchanger is used, for example Fig. 8 shows its transverse shape, and it is to make the long plate shape of regulation constitute the flat tube with single ribs, the end that flat board is horizontal, soldering and constitute flat tube 20 each other.20a among the figure, 20b are the junction surfaces that is illustrated in the set plane of dull and stereotyped lateral ends, and by this junction surface 20a, 20b has expanded bonding area, have therefore guaranteed enough soldered joint intensity.

The material usage of this in recent years flat tube 20 has minimizing slightly, mainly is to improve heat exchanger effectiveness and lightweight in order to reduce cost, and has promoted also that therefore thickness of pipe wall develops to thin direction.But these thin-walled property flat tubes 20, because (21A, 21B) molten is one, the actual intensity of also having guaranteed tubular construction by a plurality of flanges 21.

Promptly at the horizontal assigned position of flat tube 20, vertically join along it in the end of pipe top and bottom and the pipe inner face on opposite, making its height projection of joining is a plurality of flange 21A, 21B, and make it form an integral body, by these flanges 21A, 21B, a plurality of medium streams 22 of formation in pipe, the contact area that had so both increased with medium has improved heat exchanger effectiveness, strengthen the function of parts again by flange 21, thereby improved the withstand voltage properties of managing self.

Certainly we know that this flat tube is not shaped by individual flat board, but engage the flat tube that forms by two Zhang Ping's plates.And it adopts the aluminum or aluminum alloy material to shape by extruding.This pipe inside is provided with internal flow path, promptly along the next door that laterally is provided with separation of its pipe, makes it be separated into a plurality of streams.But the flat tube of this extrusion molding increases surface area for reaching, reduces cost, purposes such as lightweight and discharge dewfall, and the structure that forms section concavity ditch portion in the tube outside is also arranged.

In the above-mentioned existing flat tube for heat exchanger, as shown in Figure 8, owing to foreign material such as contained dust x in the easy residual air stream of the formed recess of flange 21A above the side pipe on ventilating, these residual dust foreign material easily form the source of corrosion, therefore can directly reduce its corrosive nature, and shorten its service life.

And be not only by the formed recess of such flange, promptly or the pipe of extrusion molding, increasing surface area for consideration and the recess that ditch portion forms is put in institutes such as lightweight and economical with materials at it, also there is the problem that causes corrosion because of residual dust in reality.

Promptly resemble this heat exchanger in general, its air stream is along managing laterally circulation, owing to be provided with the fin of heat radiation, form the tube-surface of upstream side from facing the air flow tube front about pipe, in air stream, easily adhere to contained dust, and be difficult for contaminated on the surface of dirty side pipe.Yet at the ventilation upside of tube-surface,, promptly easily facilitate this tendency, promptly concentrate the dust in the residual this air stream at the recess place as long as there is the position of above-mentioned recess.Although and the recess below pipe is full of dust, the dust that it filled also can obtain discharging, and the recess place above the pipe is quite different, remove in case wherein fill residual dust then be difficult to, and the source of very easy formation corrosion, and also dust is piled up.

Heat exchanger can be immersed by rainwater directly, also contain moisture content in the air stream, heat exchange condition limit also can produce dew near pipe, but these current recess place above the inflow pipe all equally, and passing through flowing of these current, the dust that adheres in other place also may be filled into recess.

In addition,, therefore produce corrosion slightly and will reduce the withstand voltage properties of this part, also may produce medium and leak, may cause various troubles in a word because the thickness of pipe wall thinning for considering to reduce cost and lightweight, considers to improve the heat exchanger effectiveness of foreign medium.

Especially take the heat exchanger that is contained on the vehicle,, contain many dusts in the air, so just more facilitate this tendency to take place, thereby shorten the service life of pipe because of drawing tempering air from the outside.

Such organization plan is also arranged, be about to recess, be combined into the way (for example Japan Patent discloses No. 86489/1992) of an integral body in advance by pressing at flange that the tube outside forms.

But adopt this scheme, can bring complicatedly, and can increase cost to manufacturing engineering.

The object of the invention provides a pipe that is provided with flange and ditch portion in the pipe top and bottom, and the recess that is formed by flange on pipe owing to be difficult for residual its dust, therefore can realize improving corrosion-resistant long-life heat exchanger tube.

The present invention carries out bending with Zhang Ping's plate to it, or two Zhang Ping's plate overlaids are carried out bending and form heat exchanger pipe, this pipe is to be formed by a plurality of flanges of section concavity, and the top of above-mentioned flange is connected with the flat board on opposite, and at a plurality of separation streams of the inner formation of pipe, in above-mentioned flange, promptly to be in the flange of maximum air flow upstream side at least, need below pipe, side carry out projection towards the top.

Therefore the pipe of the upstream side on air stream opposite like this owing to be provided with the recess that flange forms below pipe, can prevent that dust etc. is residual at the recess that flange forms.And at the downstream side of air stream, also be provided with the recess that flange forms at the pipe upper face side, but can remove dust in the air stream by fin packaged between the multilayer pipe,, can reduce much so remain in the dust that flange forms recess because air stream is cleaned.Consequently improve the corrosion resistance of pipe, and prolonged the life-span of heat exchanger.Certainly at the position of flowing upstream side in the face of air, contained dust also is attached on pipe easily in its air stream, but since this recess towards the below, though at flange recess dust accretions, therefore but the dust of its accumulation also is easy to fall and be eliminated from recess, can prevent that tube-surface dust etc. from be left behind.

The top of above-mentioned flange is connected with the par of opposite flat board, or be connected with the dull and stereotyped formed flange top in opposite, when the flange that is in the maximum air flow upstream side forms below pipe, the flange that is positioned at air stream downstream side also forms successively, promptly the top and pipe of pipe below, interlock projection each other and form one, thereby constitute heat exchanger tube.

The flange that on pipe, forms like this, along the flow direction of ventilating air, when being staggered to form in the pipe top and bottom, the pipe cross section after it is shaped, almost be the shape of symmetry above, therefore shaping easily, and top and bottom is at the flange of formation in shape of symmetry, so the residual stress that tube material produced also equates top and bottom, because the pipe intensity of material up and down equates, therefore can improve the resistance to pressure of himself, guarantee the durability of its heat exchanger, thereby realize prolonging the life-span of heat exchanger.

This pipe is the heat exchanger tube that adopts aluminum or aluminum alloy to be shaped by extruding, aforementioned tube is in the pipe outside, form section and be a plurality of ditch portion of concavity, and laterally be provided with the next door that internal flow path is separated mutually at it, in above-mentioned ditch portion, at least to be in the ditch portion of maximum air flow upstream side, need formation below pipe.

Like this, on the pipe that forms by extrusion molding, do grooving portion,, therefore can improve its heat exchanger effectiveness because of having increased surface area.Owing to used aluminium or aluminum alloy materials, also can reduce its cost again, make the pipe lightweight simultaneously.In addition because below pipe, formed the recess that flows upstream side its ditch portion in the face of air, therefore dust in air is not easy to enter its recess slit, even the recess that has is piled up dust, because the dust of piling up can be removed by falling, so can prevent at residual dust of tube-surface or moisture content etc.The result can improve the corrosion resistance of pipe, prolongs its life-span.

The invention will be further described below in conjunction with accompanying drawing.

Fig. 1 represents the front view of the present invention's the 1st concrete example multilayered heat exchanger;

Fig. 2 represents the cross-sectional view of flat tube, the sectional drawing of the A-A direction among Fig. 1;

Fig. 3 represents the cross-sectional view of the present invention's the 1st concrete example flat tube;

Fig. 4 represents the cross-sectional view of the present invention's the 1st concrete example flat tube;

Fig. 5 represents the cross-sectional view of the present invention's the 2nd concrete example flat tube;

Fig. 6 represents the cross-sectional view of the present invention's the 3rd concrete example flat tube;

Fig. 7 represents the cross-sectional view of the present invention's the 4th concrete example flat tube;

Fig. 8 represents the flat tube cross-sectional view of the existing flat pipe of routine heat exchanger.

According to Fig. 1 and Fig. 2 the present invention's the 1st concrete example is described below.And in the back with in the concrete example of stating, because of the multilayered heat exchanger structure that is adopted with this routine flat tube basic identical, so take identical symbol to omit its explanation.

At multilayered heat exchanger shown in Fig. 11, be to be contained between two radiating tubes 3,4, with a plurality of flat tubes 2 of equal length, 2 laminations that are parallel to each other, the tabular corrugated fin 5 of thinner package in flat tube 2, and with these flat tubes 2,2 both ends are connected with each radiating tube 3,4 and constitute.As shown in Figure 2, corrugated fin 5, its top is to be connected with the plane of flat tube 2.

Each radiating tube 3,4 upper and lower opening portion, seal by end cap 6, make the import connector 3a that injects heat exchange media from the outside at its assigned position, be interconnected with outlet connector 4a that the medium that heat exchange process is intact are discharged to the outside and be connected, and, separate by dividing plate 7 in the inside of each radiating tube 3,4.And 8 among Fig. 1 is side plates that expression multilayer flat tube is disposed about in the of 2, utilizes this side plate 8 to protect corrugated fin 5, the structural strength of also having reinforced heat exchanger 1 simultaneously.

The heat exchange media that injects from this import connector 3a between the radiating tube 3,4 about flowing through, flows through each pipe through repeatedly going in ring and carries out heat exchange, discharges from outlet connector 4a then.Promptly the medium that flowed at heat exchanger 1 by flat tube 2 colonies of regulation radical, flow through in the heat exchanger 1 with the form of going in ring downwards.

Fig. 3 and shown in Figure 4 be the expression flat tube 2, be carried out bending forming by Zhang Ping's plate, with its upper and lower end parts 2b, 2a is connected, and make by the pipe top and bottom 2A, 2B forms a plurality of flange 11A of mutual different projections, 11B forms one.Above-mentioned flange 11A, 11B be at flat tube 2 horizontal assigned positions, from the top and bottom side of flat tube 2 staggered in pipe direction carry out projection, have 4 rows, and in flat tube 2, formed 5 almost equal mutually streams 12,12 of its basal area.The medium that flow through these streams 12 have increased its contact area, have improved heat exchanger effectiveness, and simultaneously to flange 11A, 11B has also reinforced the intensity of parts, thereby have improved the withstand voltage properties of flat tube 2.

To these flanges 11A, 11B has been owing to done suitable configuration, in the tube outside by 11A, the formed recess 11a of 11B, 11b, the dust accretions that the air that makes stream reach flat tube 2,2 is taken away can have certain minimizing.

Since on flat tube, form the tabular ribs, the pipe cross section after the shaping, and it almost is up and down the shape of symmetry, therefore makes to be easy to.Promptly form flange 11A at flat-sheet material, the position of 11B, there is residual stress to exist slightly, because of timber intensity different with other parts, forming property is descended and produce and be out of shape, certainly form flange 11A, also not wishing during 11B has this phenomenon, wishes the shape that the top and bottom of manufacturing can both be symmetrical.In this example, though the top and bottom of its flat tube 2 are not complete symmetric shapes, because its top and bottom are provided with the flange 11A of equal number, therefore 11B utilizes this condition, can satisfy the requirement in the practicality fully.

Promptly arrange flanges along the horizontal of pipe or along direction formed 4 by air stream, in the interlaced formation in the top and bottom of pipe, the 1st flange 11B (1) is a side direction top projection below pipe, and the 2nd flange 11A (2) is towards the below projection from the pipe upper face side, the 3rd flange 11B (3) is from pipe downside projection upward, and the 4th flange 11A (4) is towards the below projection from the pipe upside.

Therefore as shown in Figure 4, near in the face of air stream position by heat exchanger 1, the recess 11b that forms by flange 11B be positioned at flat tube 2 below, so dust x is difficult for remaining in recess 11b part.Certainly, at the upstream side of the flow direction of air stream, owing to produce dust accretions, also there is dust x to pile up unavoidably at the recess 11b place that forms by flange 11B, but in this case, its dust is easy to come off from recess 11b and is eliminated, and therefore finally still can prevent remaining dust among the recess 11b.In addition again owing to downstream side at air stream, flange 11A by flat tube 2 upper face sides and following side, the formed recess 11a of 11B, 11b, its position is staggered each other, and flows through the dust in the air stream in the fin that is provided with up and down 5 of flat tube 2, has considered the cleaner air stream that is filtered, so by the recess 11a that flange forms, the 11b place is difficult for residual dust.

Dust that our imagination is excluded from air stream and the dust of being got rid of from the flange 11B of flat tube 2, after corrugated fin 5 filtrations, to fin 5 also is the source of a corrosion, but flowing through being corroded of flat tube 2 with its heat exchange media compares, 5 pairs of corrosion-damaged little that heat exchanger brought of corrugated fin are crossed in circulation of air, the infringement that is brought by corrosion can be narrowed down to Min..

Dextrad arrow in Fig. 3 and Fig. 4 is expressed as the flow direction of air stream, and the downward arrow among Fig. 4 is represented the direction that dust falls.

Like this, at the upstream side in the face of air stream, its recess that is formed by flange is positioned at side below the pipe, so can prevent that dust from left behind.And, also be formed the recess of flange at the pipe upper face side of air stream downstream side, and therefore flow through the air that relatively purifies, be difficult for residual dust at the recess place of flange.Also be easy to adhere to contained dust in the air stream at upstream side in the face of air stream, but be filtered as dust at the flange recess, and recess is again to be in the following side of pipe, therefore the as easy as rolling off a log whereabouts of its dust and removing, also can prevent simultaneously residual dust and moisture content, thereby can improve the corrosion resistance of pipe and prolong its life-span from pipe.

According to the 2nd concrete example shown in Figure 5, flat tube for heat exchanger of the present invention is described below.Arrow among Fig. 5 is represented the flow direction of air stream.

The flat pipe 2 of this routine heat exchanger is identical with above-mentioned concrete example, also is to be provided with 4 flanges, just arrange different, its position be with the upstream side of the air stream by the pipe top and bottom from the position, thereby can further reduce the flange recess residual dust.

Promptly form 4 row's flanges along the horizontal of pipe or along the direction by air stream, the 1st and the 2nd flange side direction upper process below managing, the 3rd and the 4th flange are from managing upper face side towards lower process.Along the horizontal air of pipe stream, progressively be cleaned by fin, therefore apart from the face of air stream position far away, as will be below it flange of side direction upper process be located at and concentrate, reality thus much also can prevent the residual dust of flange recess.In addition, the 1st of the side direction upper process the and the 2nd flange 11B (1) below managing, 11B (2), and from the 3rd and 4th flange 11A (3) of pipe upper face side to lower process, 11A (4), they laterally form left-right symmetry at pipe, therefore can not produce problems such as the low and distortion of formability.

According to the 3rd concrete example shown in Figure 6, flat tube for heat exchanger of the present invention is described below.Arrow among Fig. 6 is represented the air flow direction.

The flat pipe 2 of this routine heat exchanger, except the 1st flange of the upstream side that flows through air, the the 2nd, the 3 and the 4th flange, from the top and bottom 2A of flat tube 2,2B is square projection and form 13A, 13B in pipe, and each flange 13A, the projection amount of 13B is set half that is about flat tube 2 inner heights.And each flange 13A on opposite about the pipe, the top of 13B engages each other, thereby forms a plurality of separation streams 12,12 in flat tube 2.These flanges 13A, 13B has increased the contact area by the medium of these streams 12, has therefore improved heat exchanger effectiveness, has reinforced the function of strength of parts, thereby the withstand voltage properties of flat tube 2 is improved.

Be positioned at pipe laterally or be set in the 1st flange 11B (1) that air flows upstream side, it is to upper process from the pipe downside.The projection amount of this flange 11B (1) is set at the pipe inner height of flat tube 2 almost equally, and the position of the flat tube 2 on flange 11B (1) opposite is formed unprocessed plane, and the top of flange 11B (1) is connected with the pipe inner face of opposite flat tube 2.

Like this, the upstream side in the face of air stream because the recess that flange forms is the following side that is in pipe, therefore can prevent the residual dust in flange recess place.

According to the 4th concrete example shown in Figure 7, this flat tube for heat exchanger is described below.This routine flat tube for heat exchanger 2 is different with above-mentioned concrete example, and it is to carry out extrusion molding by aluminium.Laterally being separated into internal flow path, and be provided with a plurality of separation streams 12,12 in the inside of flat tube 2 with 15 next doors.This flat tube 2 by extrusion molding is provided with recess in the tube outside, and purpose is to make its lightweight for increasing surface area, can save necessary material and reduce cost from making.

Be the flat tube 2 of its extrusion molding, at the top and bottom of pipe 2A, 2B forms the cross section concavity ditch 14A of portion, 14B.The 14A of this ditch portion, 14B is identical with above-mentioned concrete example, and at the top and bottom of pipe 2A, 2B forms interlaced, makes the configuration that forms recess in the above, and it is residual to reduce dust.

In this example, be laterally or along the direction of ventilating air stream along pipe, on pipe top and bottom 2A and 2B, be provided with the 14A of ditch portion of 4 rows of mutually staggered, 14B, the 1st 14B of ditch portion (1) is that 2B forms below pipe, the 2nd 14A of ditch portion (2) is that 2A forms on pipe, and the 3rd 14B of ditch portion (3) is that 2B forms below pipe, and the 4th 14A of ditch portion (4) is that 2A forms on pipe.

Near in the face of air stream position,, so can prevent residual dust like this by the 14B of ditch portion (1) formed recess place because 2B forms the 1st ditch 14B (1) below pipe.So, promptly be the flat tube of extrusion molding, also can improve the life-span of its corrosion resistance and prolongation heat exchanger 1 owing to be provided with low-cost and light-weighted ditch portion.

This example is applicable to 4 flanges of formation or ditch portion on flat tube, and forms the structure of 5 medium streams in pipe, but also is not limited thereto, and it also can be used for having the flange of any radical and the ditch portion of counting arbitrarily.

Equally, this example be applicable to pipe laterally, with these spaces of respectively arranging flange or ditch portion, it is formed almost uniformly-spaced, but also can be used for part different arbitrary interval.If the intensity of pipe is no problem, also can make whole flanges side direction upper process below managing.

Above-mentioned concrete example is applicable to that flange connects vertical formation of pipe, but also can be used for the flange as spot welding at various intermittences, and the flange gauge allocation has the gap, and the structure of the connection of the adjacent flow passages in the pipe.

This example is to take Zhang Ping's plate to carry out bending and form flat tube, but is not limited thereto, and to the flat tube that forms with two Zhang Ping's plate overlaids, also applicablely is provided with above-mentioned flange at assigned position.

As above-mentioned, the present invention carries out Zhang Ping's plate bending or the bending of two Zhang Ping's plate overlaids is formed heat exchanger pipe it.Above-mentioned heat exchanger tube is to be formed by a plurality of flanges of section concavity, and the top of above-mentioned flange is connected with the flat board on opposite, and at a plurality of separation streams of the inner formation of pipe, in above-mentioned flange, promptly to be in the flange of maximum air flow upstream side at least, need below pipe, side direction carry out projection.

Flowing in the pipe of upstream side in the face of air,, therefore can prevent at the residual dust in flange recess place because side is provided with the recess that flange forms below the pipe.Again at the downstream side of air stream, be provided with the flange recess at the upper face side of pipe, and between multilayer pipe, be packaged with fin etc., the dust in the air stream is eliminated, and the air stream that is circulated relatively purifies, and therefore is difficult to residual dust at the flange recess.Thereby can improve the corrosion resistance of pipe and the life-span of prolongation heat exchanger.And in the face of the upstream side position of air stream, contained dust also can be attached on the pipe in the possible air stream, even but pile up dust at the flange recess, because of this recess towards the below, the dust of recess is easy to fall to being eliminated, thereby prevents residual dust on tube-surface.

The top of above-mentioned flange is connected with the par of opposite flat board or is connected with the dull and stereotyped formed flange top in opposite, when the flange that is in the maximum air flow upstream side forms below pipe, the flange that is positioned at air stream downstream side also forms successively, promptly the top and pipe of pipe below, staggered each other projection and form an integral body.

Like this, the flange that pipe is formed, direction along ventilating air stream, form interlaced in the top and bottom of pipe, because the pipe cross section after being shaped, be almost symmetric shape up and down, therefore be shaped easily, because top and bottom are the flanges that form under symmetric shape, therefore the residual stress that is produced on tubing also is impartial to top and bottom again, pipe tubing intensity up and down all is impartial, certainly can directly improve the resistance to pressure of pipe, guarantee the durability of heat exchanger, thereby realize prolonging the life-span of its heat exchanger.

The present invention adopts aluminum or aluminum alloy to carry out the heat exchanger pipe of extrusion molding, aforementioned tube is a plurality of ditch portion that forms section " many concavities " in the pipe outside, and laterally be provided with the next door that internal flow path is separated mutually at it, in above-mentioned ditch portion, at least to be in the ditch portion of maximum air flow upstream side, need formation below pipe.

On pipe, form ditch portion, surface area is increased and the raising heat exchanger effectiveness, especially still can save aluminium or aluminum alloy materials cost is reduced, and make the pipe lightweight at extrusion molding.In the face of the formed recess of ditch portion of the upstream side of air stream owing to be to be formed at below the pipe, therefore dust in air is difficult for invading in the slit of recess, the imagination recess is piled up dust, the dust of being piled up also can fall and be eliminated, therefore can prevent at residual dust of tube-surface and moisture content, thereby can improve corrosion-resistant and its life-span of prolongation of pipe.

As adopt the present invention, be provided with the pipe of flange and ditch portion in the pipe top and bottom, and as seen the recess that is formed by flange on pipe etc. is difficult to residual dust, so can obtains corrosion-resistant good, heat exchanger pipe that the life-span is grown.

Claims (3)

1. a heat exchanger pipe is that Zhang Ping's plate is carried out bending to it, or two Zhang Ping's plate overlaids are carried out bending and forms, it is characterized in that,

Aforementioned tube is to be formed by a plurality of flanges of section concavity, and the top of above-mentioned flange is connected with the flat board on opposite, and at a plurality of separation streams of the inner formation of heat-exchange tube,

In above-mentioned flange, promptly to be in the flange of maximum air flow upstream side at least, need below pipe side towards the top projection.

2. according to the described heat exchanger pipe of claim 1, it is characterized in that, the top of described flange is connected with the par of opposite flat board, or be connected with the dull and stereotyped formed flange top in opposite, when the flange that is in the maximum air flow upstream side forms below pipe, the flange that is positioned at air stream downstream side also forms successively, promptly top the and pipe of pipe below, interlaced projection and form one.

3. a heat exchanger pipe is to adopt the aluminum or aluminum alloy extrusion molding, it is characterized in that,

Aforementioned tube is in the pipe outside, forms section and be a plurality of ditch portion of concavity, and laterally is provided with the next door that internal flow path is separated mutually at it,

In above-mentioned ditch portion, to be in the ditch portion of maximum air flow upstream side at least, need formation below pipe.

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