EP1687580B1 - Charge-air/coolant radiator - Google Patents

Description

The invention relates to a charge air / coolant cooler in disk construction according to the preamble of claim 1.

In conventional disk-type charge / coolant coolers, the charge air and the coolant are introduced into the disks via a single nozzle each having a circular cross-section. Such a charge air / coolant cooler still leaves something to be desired, especially with regard to the cooling performance.

The publication WO 01/67021 A1 discloses a stacked disc radiator of stacked discs with openings for ingress and outflow of the respective medium.

It is an object of the invention to provide an improved charge air / coolant radiator available.

This object is achieved by a charge air / coolant radiator with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

According to the invention, a charge air / coolant cooler is provided in disk construction, wherein two adjacent disks define a gap which is traversed by a heat transfer medium, in particular a coolant, preferably a mixture with water and glycol, or a second medium to be cooled or heated, wherein the inlet and / or outflow region of the heat transfer medium and / or second Medium is extended at least off or on the inflow side. In this case, in particular, the inlet and / or outflow region of a fluid to be cooled, for example charge air, which forms the second medium, is widened.

Such, designed according to the invention charge air / coolant cooler allows a good distribution of the corresponding medium on the relevant for the heat transfer surface of the individual discs, which form the heat exchanger. The uniform flow distribution reduces the boiling problem in heat exchangers used in such critical areas.

The area preferably runs at least over one third, in particular over half, of the width of the pane straight.

Preferably, the region extends perpendicularly or substantially over at least part of the slice width, i. at an angle of 80 ° to 100 °, transverse to the mean flow direction of the second medium, in particular a fluid to be cooled.

The opening for the second medium in an end region of the disk preferably extends substantially over the entire surface thereof, excluding edge regions and regions in which channels for the heat transfer medium are arranged.

Preferably, at least two heat transfer medium channels per heat transfer medium inlet and / or outlet are provided. Such a trained heat exchanger allows a good distribution of the heat transfer medium on the relevant for the heat transfer surface of the individual discs, which form the heat exchanger. The uniform flow distribution reduces the boiling problem in such a way critical areas used heat overlays. The heat transfer medium channels are thereby formed, as well as the inflow or outflow regions of the medium to be cooled / heated, preferably by in particular aligned apertures in the individual disks.

The heat transfer medium distribution is assisted by an embodiment of the disks which is axisymmetric with respect to the heat transfer medium channels with respect to their longitudinal axis. If the disks are furthermore designed to be axially symmetrical with respect to their transverse axis with regard to the heat exchanger medium channels, the assembly is simplified.

Preferably, a single heat transfer medium inlet and / or a single heat transfer medium outlet is provided, which has a branching or merging. This allows a relatively simple structure with improved heat transfer due to the better flow distribution.

The branching and / or the merging are preferably circular-arc-shaped, so that a space-saving construction or the like around the individual discs together holding bolts. is possible.

In the area of the branching and / or the merging, a bend of 30 ° to 90 °, as seen in the flow direction, is preferably provided, wherein the forked part of the branching or merging is aligned parallel to the disks.

The heat transfer medium inlet entering the two heat transfer medium channels after the branching preferably runs parallel to the heat transfer medium channels, while the two-part part of the branching preferably takes place in a plane lying perpendicular thereto is. The heat transfer medium outlet which merges into the merger from two heat transfer medium channels preferably runs parallel to the heat transfer medium channels, while the two-part part of the branch is preferably arranged in a plane lying perpendicular thereto. This allows a compact and space-saving design of the heat exchanger. Alternatively, the supply can also be effected by means of two individual, separately formed tubes, which are connected to one another via a Y-shaped connecting piece.

A charge air / coolant cooler for cooling the charge air is preferred. In this case, a mixture with water and glycol is preferably used as the heat transfer medium (coolant).

Fig. 1

eine schematisierte perspektivische Explosionsdarstellung eines Ladeluft-/Kühlmittel-Kühlers in Scheibenbauweise gemäß dem ersten Ausführungsbeispiel,

Fig. 2

eine perspektivische Darstellung des Ladeluft-/Kühlmittel-Kühlers von Fig. 1,

Fig. 3

einen Schnitt durch den Ladeluft-/Kühlmittel-Kühler von Fig. 1 entlang Linie III-III in Fig. 4,

Fig. 4

einen Schnitt durch den Ladeluft-/Kühlmittel-Kühler von Fig. 1 entlang Linie IV-IV in Fig. 3,

Fig. 5

einen vergrößerten Ausschnitt einer Kühlmittel-Scheibe,

Fig. 6

einen vergrößerten Ausschnitt einer nicht erfindungsgemäßen Kühlmittel-Scheibe, und

Fig. 7

einen vergrößerten Ausschnitt einer nicht erfindungsgemäßen Kühlmittel-Scheibe.

In the following the invention with reference to three embodiments with reference to the drawings will be explained in detail. In the drawing show:

Fig. 1

FIG. 2 is a schematic exploded perspective view of a disk-type charge air / coolant cooler according to the first embodiment; FIG.

Fig. 2

a perspective view of the charge air / coolant radiator of Fig. 1 .

Fig. 3

a section through the charge air / coolant radiator of Fig. 1 along line III-III in Fig. 4 .

Fig. 4

a section through the charge air / coolant radiator of Fig. 1 along line IV-IV in Fig. 3 .

Fig. 5

an enlarged section of a coolant disc,

Fig. 6

an enlarged section of a non-inventive coolant disc, and

Fig. 7

an enlarged section of a non-inventive coolant disc.

Serving as a heat exchanger between charge air and coolant charge air / coolant radiator 1 has a plurality of stacked coolant discs 2. In this case, two inlet openings 3 and two outlet openings 4 are provided in each coolant disc 2, is supplied by the heat transfer medium as coolant to the interstices of the coolant disks 2 and discharged from it. The flow direction is illustrated in the figures by arrows. In this case, the coolant spreads after entering through the inlet openings 3 over the entire width of the interstices of the coolant disks 2 and flows uniformly in the direction of the outlet openings 4 (see Fig. 3 ), so that the entire length and width of the spaces between the inlet and outlet openings 3 and 4 flows through uniformly and optimum heat transfer from the charge air to be cooled, which flows through the charge air / coolant radiator 1 between the individual coolant discs 2 , can be done.

The openings 3 and 4 of the stacked coolant disks 2 form coolant channels 5 and 6. For this purpose, the areas of the openings 3 and 4 are formed correspondingly raised, so that there is sufficient space for the charge air to flow through between the coolant disks 2 and can be cooled.

The two coolant channels 5 begin - seen in the flow direction of the coolant - at a junction 7, which has a circular arc-shaped bifurcation 8 and a centrally arranged in the arc thereof, arranged parallel to the coolant channels 5 coolant inlet 9. Thus, the coolant supplied through the coolant inlet 9 is divided equally between the two coolant channels 5.

According to the entry, the exit is formed. Thus, the two coolant channels 6 end with a combination 10, which is formed according to the branch 7 and has a coolant outlet 11.

The charge air (second medium) is supplied via a charge air inlet 20, via a charge air channel 21, which is formed by openings 22 of the stacked coolant discs 2, the spaces between the flowed through by the coolant spaces of the coolant discs. 2 fed and passes through on the other side of the coolant disks 2 formed openings 23, which form a second charge air channel 24 to the charge air outlet 25th

The openings 22 and 23 are, contrary to the prior art (in Fig. 5 shown in dashed lines) are not circular, but have a portion 26 which is substantially straight according to the first embodiment, wherein it is arranged perpendicular to the normal flow direction of the charge air, so that in this region 26 tangentially with respect conventional shape, which corresponds to the inner circle of the openings 22 and 23, is arranged.

The openings 22 and 23 each occupy the entire end portion of the coolant disk 2, except for an outer edge 27, the two coolant channels 5 and 6 and each one surrounding the coolant channels edge 28 occupies.

According to the in Figure 6 illustrated non-inventive coolant disc, the region 26 of the opening 23 is formed such that it extends over the entire end portion of the coolant discs 2, wherein it is arranged perpendicular to the mean flow direction of the charge air. Here, the coolant channels are arranged further offset inwards, so that the shape of a rounded triangle results. The other side of the coolant disc 2 is formed accordingly.

According to the in Fig. 7 illustrated coolant disc corresponds to the opening 23 about the opening 23 of the second embodiment, wherein only a coolant channel is provided, which is laterally displaced in the region of the opening 23, so that the opening 23, the end portion of the coolant disc. 2 apart from an outer edge 27, the coolant channel and a coolant channel surrounding edge 28 occupies. The other side of the coolant disc 2 is designed accordingly, in particular axially symmetrical to the central transverse axis or point-symmetrical to the center of the coolant disc.

LIST OF REFERENCE NUMBERS

1

Charge-air / coolant cooler

2

Coolant disc

3

inlet opening

4

outlet opening

5

Coolant channel

6

Coolant channel

7

branch

8th

crotch

9

Coolant inlet

10

together

11

Coolant outlet

20

Charge air inlet

21

Charge air channel

22

opening

23

opening

24

second charge air duct

25

Charge air outlet

26

Area

27

outer edge

28

edge

Claims (11)

1. A charge-air/coolant radiator (1), of disk-type construction, wherein two adjacent disks (2) define an intermediate space through which a heat exchanger medium or charge air flows, wherein the disks (2) have openings (22, 23) which form passages (21, 24) for charge air and have an entry and an exit region (26), wherein the openings (22, 23) are extended compared to a circle form and the entry and exit regions (26) run rectilinearly at least over a third, in particular over half, of the width of the disk and on the entry side and on the exit side of the heat exchanger medium, respectively two openings (3, 4) for the entry and exit are provided, so that coolant passages (5, 6) are formed which are respectively spaced apart from one another, wherein the openings (22, 23) respectively occupy the complete end region of the disks (2), apart from an outer edge (27), the two coolant passages (5, 6) and an edge (28) respectively surrounding the coolant passages, characterised in that the openings (22, 23) are arranged such that a first distance between the centres of the openings (22, 23) is greater than a shortest second distance between the centre of an inlet opening (3) for the heat exchanger medium and the centre of an outlet opening (4) for the heat exchanger medium and wherein the entry and exit regions (26) protrude between the respective two openings (3, 4) for the entry and exit of the heat exchanger medium.
2. The charge-air/coolant radiator as claimed in claim 1, characterised in that the region (26) runs at least over part of the width of the disk perpendicularly or essentially transversely to the average flow direction of the second medium.
3. The charge-air/coolant radiator as claimed in one of the preceding claims, characterised in that the opening (23, 24) for the second medium in an end region of the disk (2) extends essentially over the entire surface of the same, except for edge regions (27, 28) and regions in which passages (5, 6) are arranged.
4. The charge-air/coolant radiator as claimed in one of the preceding claims, characterised in that a common heat exchanger medium inlet (9) and heat exchanger medium outlet (11) are provided for the disks (2), wherein at least two heat exchanger medium passages (5, 6) are provided per heat exchanger medium inlet and/or outlet (9 and 11).
5. The charge-air/coolant radiator as claimed in one of the preceding claims, characterised in that the disks (2) are of axially symmetrical design with respect to their longitudinal axis with regard to the heat exchanger medium passages (5, 6).
6. The charge-air/coolant radiator as claimed in one of the preceding claims, characterised in that the disks (2) are of axially symmetrical design with respect to their transverse axis with regard to the heat exchanger medium passages (5, 6).
7. The charge-air/coolant radiator as claimed in one of the preceding claims, characterised in that a heat exchanger medium inlet (9) and/or a heat exchanger medium outlet (11) has a branching (7) and/or junction (10).
8. The charge-air/coolant radiator as claimed in claim 7, characterised in that the branching and/or junction (7 and 10) is designed in the shape of an arc of a circle.
9. The charge-air/coolant radiator as claimed in one of claims 7 or 8, characterised in that a bend of 30° to 90° is provided, as seen in the direction of flow, in the region of the branching (7) and/or of the junction (10).
10. The charge-air/coolant radiator as claimed in one of claims 7 to 9, characterised in that the heat exchanger medium inlet (9), which merges into two heat exchanger medium passages (5) after the branching (7), runs parallel to the heat exchanger medium passages (5) while the two-part part of the branching (7) is arranged in a plane lying perpendicularly thereto.
11. The charge-air/coolant radiator as claimed in one of claims 7 to 10, characterised in that the heat exchanger medium outlet (11), which merges from two heat exchanger medium passages (6) into the junction (10), runs parallel to the heat exchanger medium passages (6) while the two-part part of the branching (7) is arranged in a plane lying perpendicularly thereto.

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