ZA200705420B

ZA200705420B - Plate heat exchanger

Info

Publication number: ZA200705420B
Application number: ZA200705420A
Authority: ZA
Inventors: Richter Jens
Original assignee: Behr Gmbh & Co Kg
Priority date: 2005-01-14
Filing date: 2007-07-03
Publication date: 2008-06-25
Also published as: US20080087411A1; DE102005002063A1; EP1842020B1; CN100561102C; BRPI0606533A2; KR20070097056A; JP2008527304A; CN101103242A; WO2006074903A1; EP1842020A1

Description

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Stacked plate heat exchanger

The invention relates to a stacked plate heat exchanger, especially for a motor vehicle, with several conduit devices, especially flat pipes, stacked one on top of the other and connected to each other, especially brazed, in the form of elongated plates that are assembled from two elongated plate halves forming a hollow space for passage of the medium and each having at their ends a first through hole for supplying or discharging the medium, wherein this through * hole, viewed in the transverse direction of the plate halves, is arranged between two additional through holes. :

A plate heat exchanger is known from European Patent No. EP 0 470 200 B1 which in the finished state has a number of channels connected in series via manifolds and used for a cooling fluid. Each individual channel is composed of a pair of rounded rectangular plates, which are equipped with projecting and outwardly flanged channels and are turned towards each other.

The rectangular plates are equipped with bores that are arranged on the short sides and form the manifolds. Spacers that form slotted direct-connection openings for a coolant are arranged between pairs of plates. In addition, a separator is provided between each pair of plates in the area of a corresponding short side. The spacers and the separators are arranged in the same area so that said plates and spacers are connected to each other through a furnace brazing process into a solid body on each short side of the heat exchanger. After the furnace brazing process, at least one channel is produced in the mentioned area that passes through the plates and through the spacers/separators and is provided to be used in connection with installation of the heat exchanger/cooler. The plates and the spacers/separators are provided with two through holes that are symmetrically arranged relative to the openings and recesses, so that during the production process four pipes, having an outer diameter that allows a sliding fit in the so-called bores, are stationarily arranged such that the plates and the spacers/separators on the pipes can be suspended in a desired sequence. When a given number of plates and spacers/separates is stacked, the ends of the pipes are stood upright in order to guarantee that the stacked plates and the spacers/separators are held reliably, after which the furnace brazing process is performed.

The known plate heat exchanger comprises many individual parts and has a complicated construction. In addition, the production of the known plate heat exchanger is relatively complicated.

The task of the invention is to create a stacked plate heat exchanger, which is also designated as a plate heat exchanger, especially for a motor vehicle, with several conduit devices, especially flat pipes, stacked one on top of the other and connected to each other, especially brazed, in the form of elongated plates that are assembled from two elongated plate

® a ® halves forming a hollow space for passage of the medium and each having at their ends a first through hole for supplying and discharging the medium, wherein this through hole, viewed in the transverse direction of the plate halves, is arranged between two additional through holes; and which is constructed simply and can be produced economically.

The task is achieved for a stacked plate heat exchanger, especially for a motor vehicle, with several conduit devices, especially flat pipes, stacked one on top of the other and connected to each other, especially brazed, in the form of elongated plates that are assembled from two elongated plate halves forming a hollow space for passage of the medium and having at each of their ends a first through hole for supplying and discharging the medium, wherein this hole, viewed in the transverse direction of the plate halves, is arranged between two additional through holes such that the edge area of the additional through holes is formed raised and has essentially the shape of a pot with a base in which the associated through hole is opened. The raised edge areas of the additional through holes take over the function of the separators of the known stacked plate heat exchanger. The separators can thus be eliminated.

A preferred embodiment of the stacked heat exchanger is characterized in that the edge area of the first through hole is raised and has essentially the shape of a pot with a base in which the associated through hole is opened. The raised edge region of the first through hole takes over the function of the spacer of the known stacked plate heat exchanger. The spacer can thus be eliminated. :

Another preferred embodiment of the stacked plate heat exchanger is characterized in that a bead is formed between the raised edge areas of the additional through holes and the raised edge area of the first through hole. The bead improves the solderability of a plate pair. In addition, the strength of a plate half is increased by the bead. Preferably, the bead is constructed with a slight spacing, so that both sides of a plate half are connected to the respective adjacent plate half by the bead. Therefore, strong ties are formed in the brazed stacked plate heat exchanger.

Another preferred embodiment of the stacked plate heat exchanger is characterized in that the beads are connected to each other by a meander-shaped impression or lock-bead, which is formed towards the end of the appropriate plate half between the two additional through holes outside of the first through hole. The meander-shaped impression or lock-bead can also be designated 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 devices are stacked between a base plate and a cover plate. The cover plate and the base plate delimit the stacked plate heat exchanger. One of the plates or both plates can be used to mount the stacked plate heat exchanger, for example, on or in an engine block or filter housing.

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Another preferred embodiment of the stacked plate heat exchanger is characterized in that the base plate has four through holes that are respectively arranged concentrically with the additional through holes in the conduit devices and used for the passage of attachment means whose dimensions are somewhat smaller than the diameter of the additional through holes. The attachment means preferably involve bolts with which the base plate is bolted onto an engine block, for example. The bolts preferably have bolt heads whose outer diameter is greater than the diameter of the through holes in the base plate, but smaller than the diameter of the additional through holes in the conduit devices.

Another preferred embodiment of the stacked plate heat exchanger is characterized in that the base plate and the cover plate each have four through holes that align with the additional through holes in the conduit devices and are used for the passage of attachment means whose dimensions are somewhat smaller than the diameter of the additional through holes. The attachment means preferably involve bolts with which both the base plate and also the cover plate are bolted, for example, to an engine block with the conduit devices clamped in-between.

The bolts preferably have bolt heads whose outer diameters are greater than the diameters 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 devices are each assembled from two equal plate halves rotated relative to each other by 180°, of which each has a plurality of grooves that preferably run in straight lines from one longitudinal side to the opposite longitudinal side of the plate half. The plates, each assembled from two plate halves, are also designated as flat pipes or plates. The stacked plate heat exchanger is therefore also designated as a plate heat exchanger. The straight-line profile of the grooves guarantees unimpaired passage of a medium from one longitudinal side of the plate half to the opposite longitudinal side. The grooves in the hollow space provide good swirling of the medium to be cooled. This provides the advantage that separate turbulence inserts can be eliminated.

Another preferred embodiment of the stacked plate heat exchanger is characterized in that the grooves are stamped into one side in each plate half. The grooves are formed by straight line, elongated, narrow recesses, which are also designated as beads that are stamped into one side, for example, in a sheet material. Because the grooves are stamped on one side, the production of the plate halves is simplified.

Another preferred embodiment of the stacked plate heat exchanger is characterized in that the grooves are delimited on the longitudinal sides by a peripheral edge. The peripheral edge is used to connect, especially to solder, two plate halves to each other. The hollow space between the two plate halves is therefore sealed from the surroundings.

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Another preferred embodiment of the stacked plate heat exchanger is characterized in that a plate is formed by two plate halves contacting each other whose grooves are stamped outwards.

The grooves delimit the flow path of the medium in the interior of the plate. Preferably there is an inlet at one end of the plate and an outlet at the other end of the plate for the medium.

Another preferred embodiment of the stacked plate heat exchanger is characterized in that two plates contact each other with their raised areas formed by the grooves and are brazed to each other. Coolant can be led between the raised areas from one longitudinal side to the opposite longitudinal side of the respective plate half.

Preferably, the grooves run at an angle of 35° to 55°, especially 45°, to the longitudinal axis of the associated plate half. In this way it is guaranteed that the medium can flow from one end to the other end of the plate through the hollow space formed in the interior of the plate. On the other hand, the profile of the grooves according to the invention also guarantees that the medium can flow in two plates from one longitudinal side to the opposite longitudinal side.

Preferably, the grooves of two plate halves contacting each other are arranged at an angle of 80° to 100°, especially 90°, relative to each other. Therefore, a flow path which has many changes of direction and swirls is created in the interior of the plates for the medium to be cooled. This has the advantage that boundary layers forming in the hollow space during operation are always torn open again. This leads to greatly improved heat transfer in comparison with a smooth channel without grooves. The medium to be cooled is subjected to many changes in direction while flowing through the hollow space. In contrast, the coolant can flow nearly unimpaired and in a straight line through the grooves between two plates contacting each other.

The angle of 90° produces a nearly circular solder meniscus at the connecting point of two grooves. In this way, the flow along and transverse to the main direction of flow of the medium to be cooled is affected equally.

Each of the through holes is, for example, round, elliptical, oval, polygonal, in particular, triangular, quadrangular, polygonal, rectangular or square. The through holes here have in some circumstances a different form and/or size relative to each other.

Additional advantages, features, and details of the invention emerge from the following description, in which various embodiments are described in detail with reference to the drawing.

Here, the features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. Shown are:

Figure 1, a stacked plate heat exchanger according to the invention in top [sic; front] view,

Figure 2, the stacked plate heat exchanger from Figure 1 in bottom [sic; top] view,

Figure 3, a side view of the stacked plate heat exchanger from Figure 1,

Figure 4, the view of a section along line IV-IV in Figure 2,

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Figure 5, a section view as in Figure 4 according to another embodiment,

Figure 6, a top view of a plate half, and

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

In Figure 1, a stacked plate heat exchanger 1 according to the invention is shown in front view. The stacked plate heat exchanger 1 comprises a plurality of essentially plate-shaped flat pipes 3, 4 that are stacked one on top of the other between a base plate 8 and a cover plate 9.

Each of the flat pipes 3, 4 has at its ends an opening through which a medium to be cooled, especially motor oil, can be fed or discharged. The medium to be cooled flows through the flat pipes 3, 4 in the longitudinal direction. On the outside, the flat pipes 3, 4 are impinged on by coolant that flows around the flat pipes 3, 4 perpendicular to the plane of the drawing in Figure 1.

Figure 2 illustrates the top view of the stacked plate heat exchanger 1 shown in Figure 1.

The stacked plate heat exchanger 1 can be fixed by four bolts 11 to 14 to a (not shown) engine block or filter housing or filter housing cover of a motor vehicle. In Figure 2 it is indicated that respective through holes 15; 16 for the medium to the cooled are provided in the transverse direction in flat pipes 3, 4 between a pair of bolts 11, 14; 12, 13.

In Figure 3, the stacked plate heat exchanger 1 from Figures 1 and 2 is shown in side view,

Figure 4 is the view of a section along line IV-IV in Figure 2. In Figure 4, one sees that the bolts 11, 14 each have a bolt head 17, 18, from each of which a stud-bolt 19, 20 emerges. The stud-bolts 19, 20 extend through through holes 21, 22 provided in the base plate 8. The diameter of the through holes 21, 22 is somewhat greater than the outer diameter of the stud-bolts 19, 20.

In contrast, the outer diameter of the outer heads 17, 18 is somewhat greater than the diameter of the through holes 21, 22.

In Figure 4, arrows 25, 26 indicate that the flat pipes 3, 4 have through holes, especially rim holes, whose diameters are somewhat greater than the outer diameters of the screw heads 18, 19. The through holes 25, 26 are used for passage of the bolts 11, 14 during mounting and for receiving the bolts heads 17, 18 in the mounted state of the stacked plate heat exchanger 1.

In Figure 5, a section view similar to Figure 4 is shown according to another embodiment. A stacked plate heat exchanger 30 can be fixed to a (not shown) engine block of a motor vehicle with the help of four bolts, of which only the bolts 31 and 34 are visible in Figure 5. Bolt 31 has a bolt head 32 from which a stud-bolt 33 emerges. Bolt 34 has a bolt head 35 from which a stud-bolt 36 emerges.

The flat pipes 3, 4 in Figure 5 are the same flat pipes as in Figure 4. The flat pipes are also designated as plates, especially as stacked plates, or as disks. The base plate 8 involves the same base plate as in the embodiment shown in Figure 4. In contrast to the embodiment shown in

Figure 4, two through holes 38, 39 for the stud-bolts 36, 33 are provided in the cover plate 9. The diameter of the through holes 21, 22; 38, 39 in the base plate 8 and in the cover plate 9 are somewhat greater than the outer diameter of the stud-bolts 33, 36. In contrast, the outer diameter of the bolt heads 32, 35 is somewhat greater than the diameter of the through holes 21, 22; 38, 39.

In the mounted state of the stacked plate heat exchanger 30, the bolt heads 32, 35 contact the cover plate 9 on the outside. The stud-bolts 33, 36 extend through the cover plate 9, the flat pipes 3, 4, and the ground plate 8 into (not shown) attachment holes.

Figures 6 and 7 show a plate half 41 in top view. The plate half 41 has the shape of an elongated plate made from an aluminum sheet with two straight-line longitudinal sides 42 and 43 that are arranged parallel to each other. The plate half 41 is rounded at its ends 44 and 45. There are through holes 48 and 49 in the ends 44 and 45 of the plate half 41. The through holes 48, 49 each have a raised edge area 50, 51.

The raised edge areas 50, 51 of the through holes 48, 49 each have the shape of a pot with a base, in which the through hole 48, 49 is removed, as is to be seen especially in Figure 7.

Viewed in the longitudinal direction of the plate half 41, a plurality of grooves 52 is stamped between the through holes 48, 49. The grooves 52 preferably run in a straight line from one longitudinal side 42 to the opposite longitudinal side 43 of the plate half 41. The grooves 52 have the shape of similar recesses, which are raised relative toward same side of the plate half 41 as the edge areas 50, 51 of the through holes 48, 50. The ends of the grooves 52 are rounded at the longitudinal sides 42, 43. The grooves 52 are arranged at an angle of 45° to the longitudinal axis of the plate half 41. Viewed in cross section, the plate half 41 has a wavy profile. The wavy cross-sectional profile is formed by the grooves that are stamped into the plate half 41 on one side.

For forming a plate or a flat pipe (3, 4 in Figures 1 to 3), two essentially identical plate halves 41 are arranged rotated by 180° relative to each other and brazed to each other at their peripheral edges 53. Here, the edge areas 50, 51, and the grooves 52 are directed outward in order to form on the inside a hollow space for the medium to be cooled. However, the two plate halves 41 are brazed to each other not only at their peripheral edges 53, but also at the contact - points of the grooves 52 and also the raised edge areas 57, 58, 62, 63. When placing the plate halves 41 one on top of the other, the wavy profiles touch selectively. In the interior of a plate formed by two plate halves 41, this produces changes in direction again and again for the medium to be cooled flowing through this interior, The plurality of contact points at which the two plate halves 41 are brazed to each other guarantees good pressure stability.

Viewed in the transverse direction of the longitudinal plate 41, the through holes 48, 49 are each arranged between two through holes 55, 56; 60, 61. The through holes 55, 56; 60, 61 each have a raised edge area 57, 58; 62, 63 just like the through holes 48, 49. The raised edge

PCT/EP2006/000166 areas 57, 58; 62, 63 of the through holes 55, 56; 60, 61 are cup-shaped, as is to be seen especially in Figure 7. The raised edge areas 57, 58; 62, 63 of the through holes 55, 56; 60, 61 are embossed in the same direction. The raised edge areas 50, 51 of the through holes 48, 49 as well as the grooves 52 [sic].

Between each through hole 55; 56 and the through hole 58 [sic; 48] there is a circular arc-shaped bead 65; 66. The beads 65, 66 are connected to each other by an essentially meander-shaped impression 68, which is also designated as a bead. The meander-shaped bead 68 extends between the ends of the circular arc-shaped 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. However, it is noted that the heat exchanger according to the invention is also suitable for other applications. In addition, modifications in the construction are possible without departing from the invention.

In particular, heat exchangers according to the German Patent Application No. 10 2004 012 324.2 are mentioned, which are herewith explicitly incorporated into the contents of the disclosure.

CLEAN COPY

Claims

' PCT/EP2006/000166 CLAIMS L Stacked plate heat exchanger, especially for a motor vehicle, with several conduit devices, especially flat pipes, stacked one on top of the other and connected to each other, especially brazed, in the form of elongated plates that are each assembled from two elongated plate halves forming a hollow space for passage of a medium and each having at their ends a first through hole for feeding or discharging the medium, wherein the through hole, viewed in the transverse direction of the plate halves, is arranged between two additional through holes, characterized in that the edge area of the additional through holes is raised and has essentially the shape of a pot with a base in which the associated through hole is opened.

2. Stacked plate heat exchanger according to Claim 1, characterized in that the edge area of the first through hole is raised and has essentially the shape of a pot with a base in which the associated through hole is opened.

3. Stacked plate heat exchanger according to Claim 2, characterized in that the raised edge areas of the additional through holes and the raised edge area of the first through hole and especially a peripheral edge by means of which one plate half can be assembled with a corresponding plate half, are located essentially at the same level.

4. Stacked plate heat exchanger according to Claim 3, characterized in that the raised edge area of the first through hole is delimited at the end of the appropriate plate half with a meander shape.

Ss. Stacked plate heat exchanger according to one of the preceding claims, characterized in that the conduit devices are stacked between a base plate and a cover plate. AMENDED SHEET

PCT/EP2006/000166

6. Stacked plate heat exchanger according to Claim 5, characterized in that the base plate has four through holes, which align with the additional through holes in the conduit devices and are used for the passage of attachment means whose dimensions are somewhat smaller than the diameters of the additional through holes.

7. Stacked plate heat exchanger according to Claim 5, characterized in that the base plate and the cover plate each have four through holes which align with the additional through holes in the conduit devices and which are used for the passage of attachment means whose dimensions are somewhat smaller than the diameters of the additional through holes.

8. Stacked plate heat exchanger according to one of the preceding claims, characterized in that the conduit devices are each assembled from two, in particular identical plate halves rotated by 180° relative to each other, each of which has a plurality of grooves that extend in particular in a straight line from one longitudinal side to the opposite longitudinal side of the plate half.

9. Stacked plate heat exchanger according to Claim 8, characterized in that the grooves are stamped into one side of each plate half.

10. Stacked plate heat exchanger according to Claim 8 or 9, characterized in that the grooves are delimited at the longitudinal sides by a peripheral edge. 11 Stacked plate heat exchanger according to one of Claims 8-10, characterized in that a plate is formed by two plate halves contacting each other whose grooves are embossed outward.

12. Stacked plate heat exchanger according to one of Claims 8-11, characterized in that two plates contact each other and are brazed to each other with their grooves and/or raised areas. AMENDED SHEET

PCT/EP2006/000166

13. Stacked plate heat exchanger according to one of the preceding claims, substantially as herein described with reference to and as illustrated by any of the figures. AMENDED SHEET