DE102019201387A1 - Stacking disc for a stacked disc heat exchanger and associated stacked disc heat exchanger - Google Patents

Abstract

The invention relates to a stacked plate (1) for a stacked plate heat exchanger (2) for a motor vehicle, - with an inlet (3) and an outlet (4) and a flow path (5) which is U-shaped between the inlet (3) and the Outlet (4) runs, - with a raised longitudinally running separating web (6), which runs between the inlet (3) and the outlet (4) and creates the U-shaped flow path (5). It is essential to the invention that the separating web ( 6) has at least one U-shaped bulge (7) and at least one separating web section (8) protruding from the separating web (6).

Description

The present invention relates to a stacked disk for a stacked disk heat exchanger for a motor vehicle according to the preamble of claim 1. The invention also relates to a stacked disk heat exchanger with at least two such stacked disks.

Stacked disc heat exchangers are well known and used in many applications, such as chillers, evaporators, oil coolers, condensers, etc. Such stacked disk heat exchangers have a heat exchanger block with a plurality of stacked disks stacked one on top of the other, each of which has an inlet and an outlet. The individual stacking disks are usually designed as identical parts and are only rotated about a vertical axis by 180 degrees and are soldered to one another in this state. In addition, each of these stacking disks usually has a raised edge, with which it is tightly soldered to an edge of a stacking disk arranged above and below it. A fluid flows through each level of the stacked disc cooler, a level with a heat-emitting fluid and a level with a heat-absorbing fluid being arranged alternately one above the other. In order to be able to achieve the highest possible heat transfer, a flow path that is as long as possible and delimited by two adjacent stacking disks is desirable, which is why a raised, longitudinally extending separating web is often provided, which forces a U-shaped flow path in each plane.

However, if such a separating web runs only linearly along a longitudinal center plane, the entire flow through the flow path may be undermined, since in particular in a region running directly adjacent to the dividing web there is a lower flow resistance, which ensures an increased volume flow there. This is particularly the case if, for example, a flow guide contour in the form of a bead in the flow path is not completely drawn to the separating web. If the flow guide contour, which is designed as a bead, is drawn into the separating web in order to avoid a bypass at this point, however, a breakthrough is produced in the region of the dividing web, as a result of which part of the fluid takes a shortcut from the inlet through the breakthrough to the outlet and thereby a heat transfer performance also reduced.

The present invention is therefore concerned with the problem of specifying an improved or at least an alternative embodiment for a stacking disk of the generic type, which in particular overcomes the disadvantages known from the prior art.

This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea of providing at least one U-shaped bulge and at least one dividing web section protruding from the dividing web in the region of a dividing web raised from a stacking disc plane, which is provided to force a U-shaped flow path, so that at around 180 There is neither a bypass near the separator, nor a breakthrough through the separator and thus a short circuit, around a vertical axis rotated relative to one another and stacked on one another and soldered to one another. As a result, the fluid flowing from the inlet to the outlet can be forced through the entire U-shaped flow path and a high heat transfer performance can thereby be achieved. With two stacked disks stacked on top of one another and soldered to one another and at the same time rotated by 180 degrees about a vertical axis perpendicular to a stacking disk plane, it can thus be achieved that each raised U-shaped bulge of a stacked disk with a non-raised surrounding area of a separating web section on or below Arranged stacked disc is soldered and thereby a continuous and tight separator is achieved.

In an advantageous development of the solution according to the invention, raised flow guide contours are provided in the region of the flow path. Such raised flow guide contours can be designed, for example, as elevations. Such flow guide contours can be used to avoid so-called “dead water areas” and thus force a homogeneous flow through the flow path, which enables a particularly high heat transfer rate to be achieved.

In an advantageous further development of the solution according to the invention, at least two U-shaped bulges and two separating web sections projecting from the dividing web are provided. As a result, a further improved tight soldering of the separating web including the dividing web sections and U-shaped bulges between two adjacent stacking disks can be achieved.

The U-shaped bulges are expediently arranged on one side and the separating web sections on the other side of the separating web. This can achieve that In the case of two stacking disks stacked one on top of the other, which are rotated by 180 degrees about a vertical axis projecting perpendicular to the plate plane, each raised separating web section of a stacking disk is soldered to a non-raised middle section of a U-shaped bulge of a stacking disk arranged on or below it, and a continuously tight dividing web is thereby achieved .

The stacking disk is expediently made of aluminum or sheet metal. Training as a sheet metal part in particular offers great manufacturing and monetary advantages. If the stacking disc is made of aluminum, increased heat transfer rates can be achieved since aluminum has a high coefficient of thermal conductivity.

The present invention is further based on the general idea of equipping a stacked disk heat exchanger with at least two stacked disks according to the previous paragraphs, the stacked disks being alternately rotated by 180 degrees about a vertical axis running perpendicular to the stacking disk plane and being soldered to one another, so that in the region of the separating web there is continuous soldering. By means of such a stacked disk heat exchanger according to the invention, in particular the problems known from the prior art, such as, for example, an undesired bypass flow in the case of a linear separating web and breakthroughs in the case of beads drawn into the dividing web, can be avoided.

Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures with reference to the drawings.

It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own without departing from the scope of the present invention.

Preferred exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, the same reference numerals referring to the same or similar or functionally identical components.

• 1 eine Ansicht von oben auf eine nicht unter die Erfindung fallende Stapelscheibe gemäß dem Stand der Technik,
• 2 eine Schnittdarstellung entlang der Schnittebene A-A durch die gemäß der 1 dargestellte Stapelscheibe,
• 3 eine Ansicht von oben auf eine weitere, nicht unter die Erfindung fallende Stapelscheibe,
• 4 die gemäß der 3 dargestellte Stapelscheibe mit im Betrieb auftretenden Kurschlüssen,
• 5 eine Ansicht auf eine erfindungsgemäße Stapelscheibe,
• 6 eine Ansicht wie in 5, jedoch um 180 Grad um eine senkrecht zur Blattebene stehende Hochachse gedrehte Stapelscheibe.

Show, each schematically

• 1 3 shows a view from above of a stacking disc according to the prior art, which is not covered by the invention,
• 2nd a sectional view along the section plane AA through the according to the 1 illustrated stacking disc,
• 3rd a view from above of a further stacking disc not falling under the invention,
• 4th which according to the 3rd illustrated stacking disc with course shortings occurring during operation,
• 5 2 shows a view of a stacking disc according to the invention,
• 6 a view like in 5 , but rotated 180 degrees around a vertical axis perpendicular to the sheet plane.

According to the 5 and 6 has a stacking disk according to the invention shown there in each case 1 a stacked disc heat exchanger, not shown 2nd an inlet 3rd as well as an outlet 4th and a flow path 5 on, the U-shaped between the inlet 3rd and the outlet 4th runs. Also provided is a raised, longitudinally extending separator 6 between the inlet 3rd and the outlet 4th runs and the U-shaped flow path 5 causes. According to the invention, this separating web now has 6 at least one U-shaped bulge 7 , here two U-shaped bulges 7 , and at least one from the divider 6 protruding separator section 8th , here two divider sections protruding from it 8th on. About the separator designed according to the invention 6 can have a continuous solder seam 9 along the divider 6 , the bulges 7 and the divider sections 8th can be achieved, whereby a bypass flow (compare 1 ) or a short circuit in the form of a breakdown (cf. 3rd and 4th ) can be avoided.

In the description of the figures, all the embodiments not covered by the invention are identified by an additional apostrophe at the reference symbol. Consider the stacking disc not covered by the invention 1' according to the 1 and 2nd , you can see that this is in the area of the flow path 5 ' arranged flow guidance contours 10 ' has, however, in the area of the separator 6 ' not be brought up to this. In the operation of the stacking disc 1' , for example in an associated stacked disk heat exchanger 2 ' of a motor vehicle, it thus occurs between the flow guide contours 10 ' , which can be formed, for example, as beads, and the adjacent separating web 6 ' to a bypass flow 11 ' , being in the area of the bypass flow 11 ' an increased volume flow that does not flow through the normal flow path 5 ' flows and therefore can not be used there for heat transfer. Such a bypass flow 11 ' thus reduces the heat transfer performance of the stacked disk heat exchanger 2 ' considerably.

Consider the stacking disks, which are also not covered by the invention 1' according to the 3rd and 4th , you can turn a divider there 6 ' recognize, however, individual flow guide contours 10 ' , for example beads, with the separator 6 ' are connected or pass into them. Now become two such stacking disks 1' 180 degrees around a vertical axis perpendicular to the plane of the sheet, arranged on top of one another and soldered to one another, this is what occurs in the area of those flow guidance contours 10 ' that in the separator 6 ' pass to soldering defects 12 ' which in the operation of such a stacking disc 1' equipped stacked plate heat exchanger 2 ' to breakthroughs 13 ' and thus to a short circuit flow of the fluid from the inlet 3 ' about the breakthrough 13 ' to the outlet 4 ' to lead. Such short-circuit flows in turn cause non-homogeneous flow through the entire flow path 5 ' and thereby a reduced heat transfer performance.

Now consider the stacking disks according to the invention 1 according to the 5 and 6 , it can be seen from these that with an arrangement rotated by 180 degrees about a vertical axis perpendicular to the sheet plane, two stacking disks 1 one continuous solder seam on top of the other 9 (in contrast to the embodiments according to the 3rd and 4th ) and no bypass flow 11 ' (compare 1 and 2nd ) comes. As a result, a homogeneous flow through the flow path can be achieved with extremely low manufacturing technology 5 by means of coolant, for example, and thus a significantly improved heat exchanger performance.

In the area of the flow path 5 are similar to the stacking disks not covered by the invention 1' raised flow guidance contours 10th Provided, which can be designed for example as beads and swirling or a uniform flow through the flow path 5 force with coolant. In particular, such flow guide contours 10th so-called dead water areas can be avoided.

Looking at the divider 6 according to the 5 and 6 closer, so you can see that there are two U-shaped bulges 7 and two from the divider 6 protruding divider sections 8th are provided, the separating web sections 8th essentially perpendicular to the separator 6 stand out. Of course, an arrangement deviating from 90 degrees can also be selected. The U-shape results from a viewing direction perpendicular to the plane of the sheet and thus perpendicular to the plane of the stacking disc 1 .

Also from the 5 and 6 it can be seen that the U-shaped bulges 7 on one side and the divider sections 8th on the opposite side of the divider 6 are arranged.

When two stacking disks rotated to one another by 180 degrees about a vertical axis are soldered to one another, each raised separating web section is achieved 8th a stacking disc 1 with a non-raised central section 14 a U-shaped bulge 7 a stacking disc arranged on or below 1 is soldered. In the same way, every raised U-shaped bulge 7 a stacking disc 1 with a non-raised surrounding area 15 a separator section 8th a stacking disc arranged on or below 1 soldered, resulting in a completely continuous solder seam 9 in the area of the separator 6 , the bulges 7 and the divider sections 8th can be achieved as per the 5 and 6 is shown. This distinguishes the stacking disks according to the invention 1 to a considerable extent from the stacking disks known from the prior art 1' according to the 1 to 4th , because these either have an undesirable bypass flow and impair the heat exchanger performance 11 ' (compare 1 and 2nd ) or short circuits due to solder defects 12 ' and breakthroughs 13 ' are present, which also lead to a reduced heat exchanger performance.

If you look at that 5 and 6 further, you can see that the separator 6 from an edge 16 a short side between the inlet 3rd and the outlet 4th over a maximum of 80% of the length of the stacking disc 1 extends. Over the length of the divider 6 can influence the U-shaped flow path 5 be taken.

Generally, the stacking disc 1 be formed from aluminum or from a sheet metal part, which not only enables cost-effective production, but also high-quality and good heat transfer.

With the stacking disks according to the invention 1 or the stacked disk heat exchanger according to the invention 2nd the heat transfer performance can thus be increased significantly since there is a homogeneous flow through the flow path 5 can be forced.

Claims (10)

Stacking disc (1) for a stacking disc heat exchanger (2) for a motor vehicle, - with an inlet (3) and an outlet (4) and a flow path (5), which is U-shaped between the inlet (3) and the outlet (4) runs, - with a raised longitudinally extending separating web (6) which runs between the inlet (3) and the outlet (4) and causes the U-shaped flow path (5), characterized in that the dividing web (6) at least one U -shaped bulge (7) and at least one separating web section (8) projecting from the dividing web (6). Stacking disc after Claim 1 , characterized in that raised flow guide contours (10) are provided in the region of the flow path (5). Stacking disc after Claim 2 , characterized in that at least one flow guide contour (10) is designed as a bead. Stacking disc according to one of the preceding claims, characterized in that at least two U-shaped bulges (7) and at least two separating web sections (8) projecting from the dividing web (6) are provided. Stacking disc after Claim 4 , characterized in that the U-shaped bulges (7) on one side and the separating web sections (8) are arranged on the opposite side of the separating web (6). Stacking disc according to one of the preceding claims, characterized in that the separating web (6) extends from an edge (16) of a short side between the inlet (3) and the outlet (4) over a maximum of 80% of the length of the stacking disc (1). Stacking disc according to one of the preceding claims, characterized in that the stacking disc (1) is made of aluminum or sheet metal. Stacked disk heat exchanger (2) with at least two stacked disks (1) according to one of the preceding claims, the stacked disks (1) being alternately rotated about a vertical axis by 180 ° and being soldered to one another so that a continuous soldered seam is provided in the region of the separating web (6) (9) is present. Stacked disk heat exchanger after Claim 8 , characterized in that each separating web section (8) of a stacking disk (1) is soldered to a non-raised central section (14) of a U-shaped bulge (7) of a stacking disk (1) arranged thereon or below. Stacked disk heat exchanger after Claim 8 or 9 , characterized in that each U-shaped bulge (7) of a stacking disc (1) is soldered to a non-raised surrounding area (15) of a separating web section (8) of a stacking disc (1) arranged thereon or below.

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