EP1842020A1

EP1842020A1 - Plate heat exchanger

Info

Publication number: EP1842020A1
Application number: EP06706195A
Authority: EP
Inventors: Jens Richter
Original assignee: Behr GmbH and Co KG
Current assignee: Mahle Behr GmbH and Co KG
Priority date: 2005-01-14
Filing date: 2006-01-11
Publication date: 2007-10-10
Anticipated expiration: 2026-01-11
Also published as: US20080087411A1; DE102005002063A1; EP1842020B1; CN100561102C; ZA200705420B; BRPI0606533A2; KR20070097056A; JP2008527304A; CN101103242A; WO2006074903A1

Abstract

The invention relates to a plate heat exchanger, especially for a motor vehicle, comprising several conducting devices (3, 4), above all flat pipes, in the form of elongate disks which are stacked on top of each other, are interconnected, particularly soldered together, and are composed of two elongate half disks (41) that form a hollow space for conducting a medium therethrough. Each end of said half disks (41) is provided with a first through-hole (48; 49) for feeding or discharging the medium, said through-hole (48; 49) being disposed between two other through-holes (55, 56; 60, 61) from the perspective of the transversal direction of the half disks. In order to create a plate heat exchanger that has a simple design and can be produced at a low cost, an edge region (57, 58; 62, 63) of the other through-holes (55, 56; 60, 61) is embodied in a raised manner and is substantially provided with the shape of a pot encompassing a bottom in which the associated through-hole is recessed.

Description

Stacked plate heat exchanger

The invention relates to a stacked-plate heat exchanger, in particular for a motor vehicle, with a plurality of stacked and interconnected, in particular soldered, conduit means, in particular flat tubes, in the form of elongated discs, each composed of two elongated, a cavity for performing the medium-forming disc halves are each having at their ends a first through hole for supplying or discharging the medium that, viewed in the transverse direction of the disc halves, is arranged between two further through holes.

From the European patent EP 0 470 200 B1 a plate heat exchanger is known, which has a number of channels in the finished state, which are connected in series via collectors and serve for a fluid to be cooled. Each individual channel consists of a pair of rounded rectangular plates, which are provided with protruding and outwardly flanged edges and face each other. The rectangular plates are equipped with holes, which are arranged on the short sides and form the collectors. Spacers are arranged between pairs of plates, which form slotted openings for a cooling medium. In addition, a spacer is provided between each pair of plates in the region of a corresponding short side. The spacers and spacers are located in the same area so that the said plates and spacers are oven-brazed be connected to a solid body on each short side of the heat exchanger. After the furnace brazing process, at least one channel is made in said area which passes through the plates and spacer spacers and is intended to be used in conjunction with the installation of the heat exchanger / condenser. The plates and spacers / spacers are provided with two through-holes which are symmetrically arranged relative to the openings and the recesses, so that four tubes are arranged vertically during the manufacturing process, with an outer diameter which provides a sliding fit in the so-called said holes are allowed, such that the plates and the spacers / spacers can be pushed onto the tubes in a desired order. When a given number of plates and spacers / spacers are stacked, the ends of the tubes stand upright to ensure that the stacked plates and spacers / spacers are securely held together, whereupon the oven brazing process takes place. The known plate heat exchanger includes many items and is complicated. In addition, the production of the known plate heat exchanger is relatively expensive.

The object of the invention is a stacked plate heat exchanger, which is also referred to as a plate heat exchanger, in particular for a motor vehicle, with a plurality of stacked and interconnected, in particular soldered, conduit means, in particular flat tubes, in the form of elongated discs, each of two elongated, a cavity for carrying the medium forming disc halves are composed, each having at their ends a first through hole for feeding or discharging the medium that, viewed in the transverse direction of the disc halves, is arranged between two further passage holes, which is simple and inexpensive to produce.

The object is in a stacked plate heat exchanger, in particular for a motor vehicle, with a plurality of stacked and interconnected, in particular soldered, line devices, in particular Flat tubes, in the form of elongated discs, which are each composed of two elongated, a cavity for carrying the medium-forming disc halves having at their ends a first through hole for feeding or discharging the medium, that, viewed in the transverse direction of the disc halves, between two further through holes is arranged, achieved in that the edge region of the further through holes is raised and has substantially the shape of a cup having a bottom, in which the associated through hole is recessed. The raised edge regions of the further through holes assume the function of the spacers of the known stacked plate heat exchanger. The spacers can thus be omitted.

A preferred embodiment of the stacked plate heat exchanger is characterized in that the edge region of the first through hole is raised and has substantially the shape of a cup having a bottom in which the associated through hole is recessed. The raised edge region of the first through-hole assumes the function of the spacer of the known stacked plate heat exchanger. The spacer can thus be omitted.

A further preferred exemplary embodiment of the stacked-plate heat exchanger is characterized in that a bead is formed in each case between the raised edge regions of the further through-holes and the raised edge region of the first through-hole. The bead improves the solderability of a pair of discs. In addition, the strength of a disc half is increased by the bead. Preferably, the bead is designed with a small distance so that both sides of a disk half are connected by the bead to the respective disk half which is in contact therewith. As a result, strong tie rods are formed in the soldered stacked plate heat exchanger.

A further preferred embodiment of the stacked plate heat exchanger is characterized in that the beads are connected to one another by a meander-shaped embossment or infiltration, which is formed at the end of the respective disc half between the two further through-holes outside the first through-hole. The meander-shaped embossment or infiltration can also be referred to as a bead and reinforces the previously described effect of the bead.

Another preferred embodiment of the stacked plate heat exchanger is characterized in that the conduit means are stacked between a base plate and a cover plate. The cover plate and the base plate define the stacked plate heat exchanger. One or both plates may be used to mount the stacked plate heat exchanger to, for example, an engine block or filter housing.

A further preferred embodiment of the stacked-plate heat exchanger is characterized in that the base plate has four through-holes, which are each arranged concentrically with the further through-holes in the conduit means and for carrying out fastening means whose dimensions are slightly smaller than the diameter of the further through-holes. The fastening means are preferably screws with which the base plate is screwed, for example, to an engine block. The screws preferably have screw heads whose outer diameter is greater than the diameter of the through holes in the base plate but smaller than the diameter of the further through holes in the conduit means.

A further preferred embodiment of the stacked plate heat exchanger is characterized in that the base plate and the cover plate each have four through holes, which are aligned with the further through holes in the conduit means and for performing fastening means whose dimensions are slightly smaller than the diameter of the further through holes , The fastening means are preferably screws with which both the base plate and the cover plate with the clamping devices clamped therebetween are screwed, for example, to an engine block become. The screws preferably have screw heads whose outer diameter is greater than the diameter of the through holes in the base plate and the cover plate.

Another preferred embodiment of the stacked-plate heat exchanger is characterized in that the conduit means are each composed of two identical disc halves rotated 180 ° from each other, each of which has a plurality of grooves, preferably straight from one longitudinal side to the opposite longitudinal side of the disc half. The discs, each composed of two disc halves, are also referred to as flat tubes or plates. Therefore, the stacked plate heat exchanger according to the invention is also referred to as a plate heat exchanger. The straight course of the grooves ensures unimpeded passage of a medium from one longitudinal side of the disc half to the opposite longitudinal side. In the cavity, the grooves ensure good turbulence of the medium to be cooled. This provides the advantage that can be dispensed with separate turbulence inserts.

Another preferred embodiment of the stacked-plate heat exchanger is characterized in that the grooves are pronounced on one side in each disc half. The grooves are formed by straight, elongated, narrow depressions, which are also referred to as beads, which are formed on one side, for example, in a sheet material. Since the grooves are pronounced only on one side, simplifies the manufacture of the disc halves.

Another preferred embodiment of the stacked-plate heat exchanger is characterized in that the grooves on the longitudinal sides are delimited by a peripheral edge. The peripheral edge serves to connect two disc halves together, in particular to be soldered. As a result, the cavity between the two disc halves is sealed to the environment. Another preferred embodiment of the stacked plate heat exchanger is characterized in that a disc is formed by two abutting disc halves whose grooves are pronounced outwards. The grooves define the flow path of the medium inside the disk. Preferably, an inlet is provided at one end of the disc and an outlet for the medium at the other end of the disc.

Another preferred embodiment of the stacked-plate heat exchanger is characterized in that two discs with their raised portions formed by the grooves abut each other and are soldered together. Between the raised areas, coolant can pass from one longitudinal side to the opposite longitudinal side of the respective half of the pane.

Preferably, the grooves extend at an angle of 35 ° to 55 °, in particular 45 °, to the longitudinal axis of the associated disc half. This ensures, on the one hand, that the medium can flow from one end to the other end of the disk through the hollow space formed in the interior of the disk. On the other hand, it is also ensured by the course of the grooves according to the invention that the medium can flow in two slices from one longitudinal side to the opposite longitudinal side.

Preferably, the grooves of two adjoining disc halves are arranged at an angle of 80 ° to 100 °, in particular of 90 ° to each other. This is for the medium to be cooled inside the

Slices created a flow path that changes many direction and

Whirling. This has the advantage that during operation in the cavity forming boundary layers are repeatedly torn. This results in greatly improved compared to a smooth channel without grooves

Heat transfer. The medium to be cooled is thus when flowing through the

Cavity many direction changes subjected. In contrast, that can

Flow coolant almost unimpeded and straight through the grooves between two adjoining disks. The angle of 90 ° gives a nearly circular Lötminiskus at the junction of two grooves. As a result, the flow is influenced in the same way longitudinally and transversely to the main flow direction of the medium to be cooled.

Each of the through holes is, for example, round, elliptical, oval, angular, in particular triangular, quadrangular or polygonal, rectangular or square. The through holes may have different shape and / or size each other.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. Show it:

1 shows a stacked-plate heat exchanger according to the invention in plan view;

FIG. 2 shows the stacked plate heat exchanger from FIG. 1 in the bottom view;

Figure 3 is a side view of the stacked plate heat exchanger of Figure 1;

Figure 4 is a sectional view taken along the line IV-IV in Figure 2;

Figure 5 is a sectional view as in Figure 4 according to another embodiment;

Figure 6 is a plan view of a disc half and

7 shows the view of a section along the line VII-VII in Figure 6.

FIG. 1 shows a front view of a stacked-plate heat exchanger 1 according to the invention. The stacked plate heat exchanger 1 comprises a plurality of substantially disc-shaped flat tubes 3, 4, the between a base plate 8 and a cover plate 9 are stacked one above the other. The flat tubes 3, 4 each have at their ends an opening through which a medium to be cooled, in particular engine oil, can enter or exit. The flat tubes 3, 4 are flowed through in the longitudinal direction of the medium to be cooled. On the outside, the flat tubes 3, 4 are acted upon by coolant, which flows around the flat tubes 3, 4 perpendicular to the plane in Figure 1.

FIG. 2 shows the plan view of the stacked plate heat exchanger 1 shown in FIG. The stacked-plate heat exchanger 1 can be fastened by four screws 11 to 14 to an engine block or filter housing or filter housing cover of a motor vehicle (not shown). In Figure 2 is indicated that in the transverse direction in each case between two screws 11, 14; 12, 13 a through hole 15; 16 is provided for the medium to be cooled in the flat tubes 3, 4.

FIG. 3 shows the stacked-plate heat exchanger 1 from FIGS. 1 and 2 in a side view.

FIG. 4 shows the view of a section along the line IV-IV in FIG. In Figure 4 it can be seen that the screws 11, 14 each comprise a screw head 17, 18, from each of which a bolt 19, 20 goes out. The bolts 19, 20 extend through through holes 21, 22 which are provided in the base plate 8. The diameter of the through holes 21, 22 is slightly larger than the outer diameter of the bolts 19, 20. The outer diameter of the outer heads 17, 18, however, is slightly larger than the diameter of the through holes 21, 22nd

In Figure 4 is indicated by arrows 25, 26 that the flat tubes 3, 4 through holes, in particular passages have, whose diameter is slightly larger than the outer diameter of the screw heads 18, 19. The through holes 25, 26 serve to pass through the screws 11, 14 during assembly and to receive the screw heads 17, 18 in the assembled state of the stacked plate heat exchanger 1. FIG. 5 shows a similar sectional view as in FIG. 4 according to a further exemplary embodiment. A stacked plate heat exchanger 30 is fastened to an engine block (not shown) of a motor vehicle by means of four screws, of which only the screws 31 and 34 are visible in FIG. The screw 31 has a screw head 32, from which a bolt 33 extends. The screw 34 has a screw head 35, from which a bolt 36 extends.

The flat tubes 3, 4 in FIG. 5 are the same flat tubes as in FIG. 4. The flat tubes are also referred to as discs, in particular as stacking discs, or as plates. The base plate 8 is the same base plate as in the embodiment shown in FIG. In the cover plate 9, in contrast to the embodiment shown in Figure 4, two through holes 38, 39 are provided for the bolts 36, 33. The diameters of the through holes 21, 22; 38, 39 in the base plate 8 and the cover plate 9 are slightly larger than the outer diameter of the bolts 33, 36. The outer diameter of the screw heads 32, 35, however, is slightly larger than the diameter of the through holes 21, 22; 38, 39.

In the assembled state of the stacked-plate heat exchanger 30, the screw heads 32, 35 bear against the outside of the cover plate 9. The bolts 33, 36 extend through the cover plate 9, the flat tubes 3, 4 and the base plate 8 through into (not shown) mounting holes.

In the figures 6 and 7, a disc half 41 is shown in plan view. The disk half 41 has the shape of an elongated plate made of aluminum sheet with two straight longitudinal sides 42 and 43, which are arranged parallel to one another. At its ends 44 and 45, the disc half 41 is rounded. In the ends 44 and 45 of the disc half 41 through-holes 48 and 49 are provided. The through holes 48, 49 each have a raised edge region 50, 51. As can be seen in particular in FIG. 7, the raised edge regions 50, 51 of the through-holes 48, 49 each have the shape of a cup with a bottom in which the through-hole 48, 49 is recessed.

Viewed in the longitudinal direction of the disc half 41, between the through holes 48, 49 a plurality of grooves 52 are pronounced. The grooves 52 preferably extend straight from one longitudinal side 42 to the opposite longitudinal side 43 of the disc half 41. The grooves 52 have the shape of similar recesses, which are raised to the same side of the disc half 41 as the edge regions 50, 51 of the through holes 48, 50th Die Ends of the grooves 52 are rounded to the longitudinal sides 42, 43 out. The grooves 52 are arranged at an angle of 45 ° to the longitudinal axis of the disc half 41. When viewed in cross section, the disk half 41 has a wave-shaped profile. The wave-shaped cross-sectional profile is formed by the RiI- len that are pronounced on one side in the disc half 41.

To form a disc or a flat tube (3, 4 in Figures 1 to 3) two substantially identical disc halves 41 are rotated by 180 ° to each other and soldered at their peripheral edges 53 with each other. The edge regions 50, 51 and the grooves 52 are directed outward to form a cavity for the medium to be cooled inside. However, the two disc halves 41 are soldered together not only at their peripheral edges 53, but also at the contact points of the grooves 52 and the raised edge regions 57, 58, 62, 63. When stacking the disc halves 41, the wave profiles touch punctually. This results in the interior of a disc formed from two halves 41 disc again and again changes in direction for the flowing medium to be cooled. The large number of contact points at which the two disk halves 41 are soldered together ensures good pressure stability.

The through holes 48, 49, viewed in the transverse direction of the longitudinal disk 41, each between two through holes 55, 56; 60, 61 arranged. The through holes 55, 56; 60, 61, as well as the through holes 48, 49, each have a raised edge region 57, 58; 62, 63 on. The raised edge regions 57, 58; 62, 63 of the through holes 55, 56; 60, 61 are, as can be seen in particular in Figure 7, cup-shaped. The raised edge regions 57, 58; 62, 63 of the through holes 55, 56; 60, 61 are pronounced in the same direction. The raised edge regions 50, 51 of the through holes 48, 49 and the grooves 52.

Between in each case a through hole 55; 56 and the through hole 58 is in each case a circular arc-shaped bead 65; 66 trained. The beads 65, 66 are interconnected by a substantially meander-shaped indentation 68, which is also referred to as a bead. The meandering bead 68 extends between the ends of the arcuate beads 65 and 66 around the through hole 48.

The present invention has been explained using the example of a stacked plate heat exchanger for motor vehicles. It should be noted, however, that the heat exchanger according to the invention is also suitable for other applications. In addition, modifications in the design are possible without departing from the invention. In particular, reference is made to heat exchangers according to German patent application 10 2004 012 324.2, which hereby expressly belongs to the disclosure content.

Claims

P at β ntanspr che che

1. stacked plate heat exchanger, in particular for a motor vehicle, with a plurality of stacked and interconnected, in particular soldered, conduit means (3,4), in particular flat tubes, in the form of elongated discs, each consisting of two elongated, a cavity for passing a medium forming disc halves (41) each having at their ends a first through hole (48; 49) for feeding or discharging the medium, the through hole (48; 49), viewed in the transverse direction of the disc halves (41), between two further through-holes (55, 56; 60, 61), characterized in that the edge region (57, 58, 62, 63) of the further

Through holes (55,56; 60,61) is formed sublime and has substantially the shape of a cup having a bottom in which the associated through hole is recessed.

2. stacked-plate heat exchanger according to claim 1, characterized in that the edge region (50,51) of the first through-hole (48; 49) is raised and has substantially the shape of a cup having a bottom, in which the associated through hole is recessed ,

3. stacked-plate heat exchanger according to claim 2, characterized in that the raised edge regions (57,58) of the further through-holes (55,56) and the raised edge region (50) of the first through-hole (48) and in particular a peripheral edge (53). , over which a half of the disc with a corresponding the disc half is assembled, are located substantially at the same level.

4. The stacked-plate heat exchanger according to claim 3, characterized in that the raised edge region (50) of the first through-hole (48) is delimited in a meandering manner toward the end of the respective pane half (41).

5. stacked plate heat exchanger according to one of the preceding claims, characterized in that the conduit means

(3,4) between a base plate (8) and a cover plate (9) are stacked.

6. stacked-plate heat exchanger according to claim 5, characterized in that the base plate (8) has four through-holes (21, 22) which with the further Durchgangslöchem (55,56; 60,61) in the conduit means (3,4 ) are aligned and serve for carrying out fastening means (11-14) whose dimensions are slightly smaller than the diameter of the further through holes.

7. stacked plate heat exchanger according to claim 5, characterized in that the base plate (8) and the cover plate (9) each have four through holes (21, 22, 38,39), with the further through holes (25,26) in the Line devices are aligned and serve to perform fastening means (31, 34) whose dimensions are slightly smaller than the diameter of the further through holes!

8. stacked plate heat exchanger according to one of the preceding claims, characterized in that the conduit means

(3,4) are each composed of two, in particular identical, disc halves (41) rotated by 180 ° to each other, each of which has a multiplicity of grooves (52), which in particular extend straight from one longitudinal side (42) to the opposite longitudinal side (43 ) of the disc half (41).

9. stacked plate heat exchanger according to claim 8, characterized in that the grooves (52) are pronounced on one side in each disc half.

10. stacked plate heat exchanger according to claim 8 or 9, characterized in that the grooves (52) on the longitudinal sides of a peripheral edge (53) are limited.

11. stacked plate heat exchanger according to one of claims 8 to 10, characterized in that a disc (3,4) of two adjoining disc halves (41) is formed, the grooves (52) are pronounced outwards.

12. stacked plate heat exchanger according to one of claims 8 to 11, characterized in that two discs (3,4) with their grooves (52) and / or raised portions (50,57,58) abut each other and are soldered together.