DE202005015627U1 - Heat exchanger network and thus equipped heat exchanger - Google Patents

Abstract

Heat exchanger with at least two plates (4) and one between them Passage (24) for a refrigerant, which contains a plurality of parallel flow channels (35), the laterally arranged by perpendicular to the plates (4), two each Ends (32a, 32b) having dividing walls (32) and limited by alternately at one or the other ends (32a, 32b) of the partitions (32) provided deflection zones connected in a serpentine shape are characterized in that the passage (24) through at least a, with the plates (4) connected, having a meandering cross-section and the partitions (32) containing lamella (31) is formed and the deflection zones at the ends (32a, 32b) of the partitions (32) provided recesses (36) exist.

Description

The The invention relates to a heat exchanger network the type specified in the preamble of claim 1 and a Equipped with this heat exchanger.

With Wärmeaustauschernetzen this type produced heat exchanger be z. B. in compressed air systems required by means of a compressor generated and under pressure from z. B. 25 bar standing compressed air to deprive it of moisture for use in critical applications such as B. in the food and paper industry or in the medical Make area suitable. The air drying takes place thereby, that the air coming from the compressor, heated air after the passage through an aftercooler is passed through a device comprising an air / air and a refrigerant / air heat exchanger contains.

While the air / air heat exchanger is usually made in the manner of a plate heat exchanger of conventional construction, the refrigerant / air heat exchanger z. Example, from a combined pipe / plate heat exchanger with a network, which has formed from plates and these spaced-apart strips air passages and intermediate refrigerant passages. These consist z. B. arranged between each two plates, round or square cross-sections having tubes having straight sections and these serpentine or meandering connecting deflection sections ( EP 0 521 298 A2 ). A disadvantage of this construction is that between the individual pipe sections unused spaces arise and the curved deflection sections are usually outside of the space occupied by the actual network and are not involved in the heat exchange.

In addition, has already been proposed (also EP 0 521 298 A2 ) to replace the flow-through of the refrigerant passages through the network produced by conventional plate construction pipe and deflection sections by these are limited by conventional, arranged between the plates partitions in the form of strips. The disadvantage here, however, that either comparatively thick bars must be provided in order to create the soldering surfaces sufficiently large for solder joints, whereby for given overall dimensions of the network reduced flow cross sections are obtained, or although narrow strips can be used, which allow favorable flow cross sections, but comparatively small, for the required strength of the heat exchanger not always sufficient soldering surfaces must be taken into account.

The last-mentioned problems can largely be avoided in that the dividing walls are formed by the webs and / or flanges of profiles arranged between the plates with I- and / or U-shaped cross sections ( EP 1 304 536 A2 ). If the flow channels are produced according to a first variant by means of a plurality of I-profiles, which are connected to the plates by soldering, then these profiles od before the soldering at least two points by laser welding. Like. Be connected to the plates, to exclude relative position changes between the plates and the profiles during the dipping and tilting processes required during the soldering process. If, however, the flow channels are formed according to a second variant as U-shaped grooves in solid, plane-parallel plates, these and the deflection zones must be produced by milling, in particular track milling. Both variants cause comparatively high production costs, which are not always sustainable.

In contrast, lies The invention is based on the technical problem, the heat exchanger network to design the genus described above so that it is in use cost-effective Manufacturing process can be produced with the required strength can, in soldering Respects unproblematic and yet given given overall dimensions comparatively large Flow areas for the refrigerant allows.

to solution This problem is served by the characterizing features of claims 1 and 13.

By the application of Slats, each forming a plurality of flow channels, the number of before the soldering process to be performed welding be significantly reduced. Furthermore can the slats by extrusion and thus cost-effective with in itself any strength can be produced. Finally, can the partitions and / or any of these limited flow channels in principle any Cross-sectional shape are given, which in terms of individual case desired performance and stability the heat exchanger network Cheap is.

Further advantageous features of the invention will become apparent from the dependent claims.

The The invention will be described below in conjunction with the accompanying drawings based on embodiments explained in more detail. It demonstrate:

1 a schematic front view of a combined refrigerant / air and air / air heat exchanger block for refrigeration dryer to compressed air Attachments;

2 and 3 Sections along the lines II-II and III-III of 1 ;

4 an enlarged front view of the determined for the refrigerant / air heat exchange network of the block after 1 ;

5 a section along the line VV of 4 ;

6 an enlarged plan view of a blade according to the invention for the production of a refrigerant passage of the network according to 5 ;

7 to 9 Sections along the lines VII-VII to IX-IX of 6 ;

10 a further enlarged front view of a section of a single refrigerant passage of the network after 4 ; and

11 a plan view of the refrigerant passage after 10 omitting an upper plate.

A heat exchanger device for refrigeration dryer in compressed air systems contains after 1 to 3 in the right part of a refrigerant / air heat exchanger and in the left part of an air / air heat exchanger. There are only one refrigerant / air heat exchanger network 1 and an adjacent air / air heat exchanger network 2 both combined into an integral unit and a single contiguous block 3 form. Alternatively, of course, it would also be possible to use both networks 1 and 2 manufacture and operate as separate units.

The two networks 1 and 2 are mainly by plane-parallel, rectangular or square plates or dividers 4 formed over the entire width and length of the trestle 3 are extended. According to 1 and 3 is part of the plates 4 on the one hand by perpendicular to the longitudinal bars 5 which in in 3 left ends of the block 3 are arranged, and on the other hand by longitudinally extending, on the side edges of the plates 4 arranged strips 6 . 7 kept in pairs at a distance. This creates between these plates 4 crossings 8th , At the in 3 left end are the top bars 6 a little shorter, leaving between their left ends and the last 5 each intermediate spaces 9 arise through the air in the direction of a drawn arrow 10 can enter laterally. At the in 3 the right end, the air, in contrast, can be parallel to the longitudinal direction of the passages 8th and in the direction of an arrow 11 emerge laterally. In the passages 8th are otherwise useful conventional slats 12 inserted in the 1 are only partially shown and their passages accordingly 3 along lines 14 are deflected by 90 °.

The other part of the plates 4 is according to 1 and 2 in which the net 2 forming part by running parallel to the longitudinal direction, on the side edges of the plates 4 arranged bar 15 and 16 as well as across, the left and right end of the network 2 forming end strips 17 and 18 kept in pairs at a distance. This creates between two plates each 4 one more passage each 19 , On the pages of in 2 right end strips 18 are the in 2 upper last 15 a little shorter, leaving between them and the end strips 18 each intermediate spaces 20 arising through the air laterally in the direction of an arrow 21 ( 2 ) can be supplied. By contrast, on the in 2 left side of the bars 16 a little shorter, so here between them and the end strips 17 interspaces 22 arise, through which the air supplied at 20 can be discharged again (arrow 23 ). The deflections are carried out analogously to 3 preferably with appropriately trained, in the passages 19 provided slats 24 ( 1 ).

In the web 1 serve the same plates 4 that the passages 19 limit, to the formation of serpentine arranged passages 24 ( 1 ), which have straight and the deflection serving sections, as explained in more detail below. The passages 24 each extend from the end strips 18 up to a conclusion bar 25 , in the 1 and 2 at the right end of the block 3 is arranged. Preferably pairs of plates alternate with the passages 8th and plate pairs with the passages 19 . 24 in superposed planes, with at least one passage each 8th . 19 . 24 is available. According to 2 will passages 24 at one by an arrow 26 indicated input fed to a refrigerant, which is connected to a by an arrow 27 indicated output can flow out again and flows through a refrigerant circuit, not shown.

The by the arrows 10 . 11 . 21 . 23 . 26 and 27 Marked inputs and outputs od with known, not shown inlet nipples, collection boxes od. Like. Connected.

The operation of the described heat exchanger device is essentially as follows:
Coming from a compressed air system, on z. B. about 35 to 55 ° C heated compressed air is in the direction of the arrow 10 fed so they pass through 8th flows through. The air is initially in the network 2 through the countercurrent in the direction of the arrow 21 supplied, coming from a water, not shown cold air to a temperature of 20 ° C cooled. On her way through the passageways 8th The compressed air is then gradually in the network 1 cooled to its dew point, since it interacts with the refrigerant here, in the direction of the arrow 26 ( 2 ) in the passages 24 flows. The compressed air is then at the by the arrow 11 ( 3 ) marked output and fed to a water separator, not shown, from where they at the arrow 21 in the net 2 introduced and this at the by the arrow 23 indicated output is taken, which serves as a tapping point for the compressed air. In this case, the arrangement is chosen so that the air at the tapping point is heated again approximately at room temperature.

Heat exchangers of the type described and their mode of action are generally known to the person skilled in the art ( EP 0 521 298 A2 . EP 1 304 536 A2 ) and therefore need not be explained in detail.

The inventive design of a refrigerant passage 24 of the network 1 is described below on the basis of 6 to 11 for convenience of description, the terms "right", "left", "front", "rear", "top" and "bottom" are selected according to the particular situation resulting from the specific illustration in FIG 6 to 10 results. After that, the passage becomes 24 by a plurality of parallel juxtaposed slats 31 ( 6 to 9 ) educated. Each lamella 31 according to 8th and 9 a meandering cross section and a plurality, in the exemplary embodiment, five partitions 32 on. Like also in 8th and 9 shown are the partitions 32 vertically, parallel to each other and equidistant from each other and alternately top and bottom by horizontal, upper and lower webs 33 . 34 interconnected, as is typical of meanders. Because of the presence of five partitions 32 are two upper and two lower webs 33 . 34 provided so that each two adjacent partitions 32 and a connecting bridge 33 or 34 a flow channel 35 limit and a total of four such flow channels 35 per slat 31 available. In this case, the arrangement is preferably made such that each flow channel 35 has the same flow cross-section.

The slats 31 are preferably prepared by extrusion of aluminum or an aluminum alloy and subsequent cutting to the desired length in the individual case. Therefore, their partitions 32 initially the same length and each with a front and rear end or a front or rear end face 32a . 32b Mistake. After cutting to length, the partitions become 32 however, at one end or the other 32a . 32b with a recess 36 Mistake. As in 7 is indicated by dashed lines, for this purpose z. B. the last, to the end 32a . 32b bordering section of the partition 32 by milling od. Like. Removes, whereupon a grinding operation with a steel brush. The like can join for grinding the burrs. In particular 6 shows, the recesses become 36 at successive partitions 32 alternately at one end or the other 32a . 32b attached so that in the embodiment at the front end of the blade 31 three and at the rear end of the lamella 31 two such recesses 36 to come to rest.

10 and 11 show one by applying the slats 31 produced refrigerant passage 24 (see also 5 ). For its production is a first lamella 31a parallel to and with one of the width of a flow channel 35 appropriate distance from the end bar 18 arranged. Here is the position of the lamella 31a chosen so that an outer, leftmost partition 32a parallel to the bar 18 is arranged and its recess 36 at the in 11 not shown, rear end of the slat 31a has. To the partition 32a like the other partitions 32 in 11 indicated by dashed lines, close according to the meander shape three middle partitions 32b . 32c and 32d and another outer partition 32e on, in 10 and 11 comes to the far right. Because of the basis of the 6 to 9 described arrangement of the recesses 36 come here the two recesses 36 the partitions 32b . 32d in front and three in 11 invisible recesses 36 the partitions 32a . 32c and 32e to lie behind.

To the slat 31a joins in 10 and 11 a second lamella 31b at. This is identical to the lamella 31a formed, however, in comparison to this one perpendicular to the plane in 11 arranged axis rotated by 180 °, so that in her accordingly 6 and 8th three recesses 36 in front and two more, in 11 invisible recesses 36 lie behind. There is also a leftmost partition 32f the slat 31b with one of the width of a flow channel 35 appropriate distance from the partition 32e the slat 31a and arranged parallel to this.

The alternately up and down open flow channels 35 ( 8th and 9 ) according to 10 up or down by one of the plates 4 closed, with the outsides of the webs 33 . 34 are suitably connected by soldering. In contrast, the front and rear ends of the flow channels 35 through individual profiles 37 closed, one essentially the double distance from two partitions 32 have corresponding width, with the front and rear ends of the slats 31a and 31b or the partitions 32 as well as with the plates 4 preferably gas-tight by welding (MIG or TIG) are connected and for weight and cost reduction z. B. from 11 apparent, have trapezoidal cross-sections. Similarly, the front and rear, as well as the upper and lower portions of flow channels 38 gas-tight sealed between the slats 31a and 31b , the lamella 31a the final lamella 18 and on the other side of the net 1 between the last lamella 31 and the end bar 25 ( 5 ) are formed, wherein the two last-mentioned flow channels 38 corresponding 5 z. B. remain open at the front to there the refrigerant in the direction of the arrows 26 . 27 to be able to supply and remove.

The application of individual profiles 37 is preferred in spite of the associated workload over the use of continuous plates, because it compensates for lighter tolerances and leakage currents of the refrigerant or consequent short circuits between the individual flow channels 35 in 5 from left to right can be avoided.

The recesses described 36 form after the completion of the refrigerant passage 24 ( 5 ) each one alternately front or rear deflection zone, passing through the respective plates 4 , Profiles 37 and partitions 32 is limited. This allows the chiller according to 5 and 11 z. B. in the direction of the arrow 26 in the associated flow channel 38 enter, at its rear end by the associated recess 36 in the partition 32a in the neighboring, between the partitions 32a . 32b formed flow channel 35 replace and flow through from back to front, then through the front recess 36 in the partition 32b in between this and the partition wall 32c formed flow channel 35 to pour, etc., until finally out of the in 5 rightmost flow channel 38 in the direction of the arrow 27 emanates again. The refrigerant therefore flows along a serpentine, in 5 partially marked by arrows flow path through the passage 24 ,

Above and below the in 10 illustrated passage 24 can do more, corresponding passes 24 present and be separated by air passages, as in particular 1 to 4 make clear. In this case, the profiles extend 37 expedient over the entire height of the heat exchanger network.

The number of flow channels 35 and 38 that make up the refrigerant passages 24 may be selected depending on the requirements of the case. Instead of the four flow channels 35 to 8th and 9 can also have more or less flow channels 35 per slat 31 to be available. With an even number of partitions 32 per slat 31 these can be laid in particular with the same orientation, since in this case the recesses 36 the first partition 32 always z. B. forward and the recesses 36 the last partition 32 always z. B. come to lie behind. Also combinations with different numbers of partitions 32 and flow channels 35 are possible, with adjacent slats 31 can be arranged immediately adjacent to each other, in which case the flow channels located between them 38 would be missing. There are slats 31 with a smaller number of partitions 32 the advantage that they are only slightly curved during extrusion because of the more uniform flow of material and therefore when taking place before soldering setting the heat exchanger network 1 can be straightened. In contrast, would have a much larger number of partitions 32 provided slats 31 before setting the network 1 with the help of additional devices such. B. rollers od. Like. Be straightened.

The assembly of the heat exchanger block 3 to 1 takes place in a customary in heat exchangers by z. B. first the plates 4 and lamellae 31 connected by soldering and then the profiles 37 by welding to the plates 4 and lamellae 31 be attached. This results in the advantage that the slats 31 before soldering to secure the position only at two points, each with an associated plate 4 must be connected by welding, while in the application of individual profiles as partitions (in the embodiment, five individual profiles per blade) each 10 welding operations would be required.

The invention is not limited to the described embodiment, which could be modified in many ways. This applies z. B. for the special cross-sections of the slats 31 that accordingly 8th on the outsides of the webs 33 . 34 with lateral extensions 40 may be provided to obtain larger solder surfaces, without thereby significantly reduce the flow cross-sections. In addition, the webs could 33 and 34 and / or the widening 40 slightly convexly curved to obtain a desired to improve the soldering crown. Furthermore, although there are the slats 31 and profiles 37 z. B. aluminum and the plates 4 plated aluminum, but it will be understood that other materials commonly used to make heat exchanger networks may be used as needed. Furthermore, it is basically indifferent whether the networks 1 and 2 with the help of the continuous plates 4 form an integral component, manufactured separately and then assembled into an integral component or find application as separate components that are interconnected by appropriate lines. This can be the networks 1 . 2 also be arranged one above the other instead of side by side. Moreover, it is of course possible, the heat exchange networks according to the invention 1 for purposes other than those described and wherever refrigerant passages are required. Finally, it is understood that the various features may be provided in combinations other than those described and illustrated.

Claims (14)

Heat exchanger network with at least two plates ( 4 ) and a passage arranged between them ( 24 ) for a refrigerant having a plurality of parallel flow channels ( 35 ) laterally through perpendicular to the plates ( 4 ), each two ends ( 32a . 32b ) having partitions ( 32 ) and alternately at one or the other ends ( 32a . 32b ) of the partitions ( 32 ) deflection zones are connected in a serpentine manner, characterized in that the passage ( 24 ) by at least one, with the plates ( 4 ), having a meandering cross-section and the partitions ( 32 ) containing lamella ( 31 ) is formed and the deflection zones from at the ends ( 32a . 32b ) of the partitions ( 32 ) recesses ( 36 ) consist. Heat exchanger network according to claim 1, characterized in that the refrigerant passage ( 24 ) of a plurality of juxtaposed, in each case a plurality of partitions ( 32 ) having lamellae ( 31 ) is composed. Heat exchanger network according to claim 1 or 2, characterized in that the lamellae ( 31 ) consist of extruded parts. Heat exchanger network according to one of claims 1 to 3, characterized in that the lamellae ( 31 ) consist of aluminum or an aluminum alloy. Heat exchanger network according to one of claims 2 to 4, characterized in that the lamellae ( 31 ) are juxtaposed at distances equal to the width of a flow channel ( 35 ) correspond. Heat exchanger network according to one of claims 1 to 5, characterized in that the lamellae ( 31 ) and plates ( 4 ) are connected together by soldering. Heat exchanger network according to one of claims 1 to 6, characterized in that open ends of each two adjacent flow channels ( 35 ) and with these also an associated deflection zone by one each with an outer side of the blade ( 31 ) connected profile ( 37 ) are sealed. Heat exchanger network according to claim 7, characterized in that the profiles ( 37 ) by welding with the lamella ( 31 ) are connected. Heat exchanger network according to one of claims 1 to 8, characterized in that the recesses ( 36 ) are obtained by milling. Heat exchanger network according to one of claims 1 to 9, characterized in that it comprises a plurality of superimposed refrigerant passages ( 24 ) and between two directly superimposed refrigerant passages ( 24 ) each one air passage ( 8th ) having. Heat exchanger network according to one of claims 1 to 10, characterized in that it is part of a combined refrigerant / air heat exchanger block ( 1 ) is trained. Heat exchanger network according to claim 11, characterized in that the plates ( 4 ) each have two sections, wherein each of the sections a refrigerant / air heat exchanger network ( 1 ) and the other sections an air / air heat exchanger network ( 2 ) form. Refrigerant / air heat exchanger, characterized in that it has a heat exchanger network ( 1 ) according to at least one of claims 1 to 12. heat exchangers according to claim 13, characterized in that it is combined Refrigerant / air and air / air heat exchanger is trained.