DE202011003054U1 - heat exchangers - Google Patents

Abstract

A heat exchanger comprising a block (2) having ribs (9) and tubes (8) arranged between two containers (3, 4), each rib (9) consisting of a plurality of ribbed arches (9a) and each ribbed arch (9a) is formed approximately V-like and the, a ribbed bow (9a) forming two flanks (12, 13) each have a plurality of air slots (14) which extend transversely to the flow direction of a through the rib bow (9a) flowing medium, characterized in that the two flanks (12, 13) of the rib bow (9a) are connected via a first connecting surface (15) and / or the opposite flanks (13, 12) of two successive rib bows (9a) via a second connecting surface (16) (15) and / or the second connection surface (16) have a rib-arch cross-section change element (17, 18, 19) which in the intermediate space (20) between the ribs (9 a) forming flanks (12, 13) and / or the gegenüberli egende flanks (13, 12) of two successive rib arcs (9a) is directed.

Description

The invention relates to a heat exchanger, with a rib and tubes having block, which is arranged between two containers, each rib consists of multiple rib arcs and each rib bow is formed approximately V-like and the, a rib bow-forming flanks each having a plurality of air slots, which extending transversely to the flow direction of a medium flowing through the rib bow.

Conventional heat exchangers consist of an inlet box and a discharge box, which will be referred to as a container, wherein between the two containers, a block is arranged, in which there are tubes which connect the two containers together. The heat exchanger is arranged in front of the internal combustion engine. Through the two containers and the tubes flows a coolant, which is heated by the heat emitted by the internal combustion engine. The ribs formed between the tubes are penetrated by an air flow, which absorbs the heat given off by the coolant and discharges it from the region of the heat exchanger. The thus cooled coolant is returned to the engine.

From the US 6,968,891 B2 a V-like fin arc is known, which is formed by two opposite edges, each flank having a plurality of air slots, which is formed transversely to a flow direction of a medium, which is guided by the gap of the flanks. The louvers have the task of fluidizing the medium, thus enabling a better heat exchange. The problem with V-shaped ribbed arches is that the wide area of the V-shaped cross section flows through at high speed, which is why these medium flows are also referred to as jets. For this reason, this part of the air flow does not take place at the transverse exchange, which is caused by the louvers contained in the flanks of the rib bow.

According to the US 2007/0012430 A1 For example, a heat exchanger is known which has ribs which are formed from a plurality of ribbed arcs which have a rectangular cross section. The two flanks forming the respective rib bow have air slots for swirling the medium flowing through the rib bows, the flanks being connected in a meandering manner via a connecting surface which has projections which are formed transversely to the flow direction of the air. By means of these projections, the stability of the rib bow in the production, in particular the bending, improved and thus allows the formation of a stable rectangular cross-section of the rib bows.

From the US 2009/0173480 A1 For example, a heat exchanger is known which has a rib which is arranged in thermal contact with a pipe. The rib consists of various ribbed arches with a rectangular cross-section. The connection between the flanks of a rib bow comprises a plurality of elevations, which are directed in the direction of the interior space between the flanks of the rib bow and interrupt the flow of the medium. As a result, the flow is disturbed, they can not shoot through unhindered, but a cross exchange is enforced, resulting in a better heat transfer.

By paralleling the flanks of the rib bow and the generation of a rectangular cross-section of the rib bow, the jets are indeed reduced, but can not be completely prevented because the louvers do not reach into the bending radius of the costal arch, otherwise the rib is too unstable and the Louvers would break in the production.

The invention is therefore an object of the invention to provide a stably shaped V-like ribbed ribs, in which areas at high speed of flowing through the rib bow medium in the flow direction, which can not participate in the transverse exchange of the louvers are avoided.

According to the invention, the object is achieved in that the two flanks of the rib bow are connected via a first connecting surface and / or the opposite flanks of two successive rib bends over a second connecting surface, wherein the first and / or the second connecting surface have a rib arch cross section changing element, which in the Gap between the, a rib-bow-forming edges and / or the opposite edges of two successive rib bows is directed. This has the advantage that an improvement of the rib flow is achieved, whereby the cooling capacity of the heat exchanger is improved. In addition to maintaining a stable construction of the V-like ribbed ribs, the cross-section of the rib bow is varied in depth or width such that all cross-sectional areas in the flow direction of the medium which extend parallel to the flanks of the rib bow reliably depend on the transverse exchange through the ribs Louvers can participate.

Advantageously, each bonding surface is opposite to an open region, which faces from is formed on the two flanks which are connected by the connecting surface, wherein the extent of the open area between the two flanks is smaller than the extent of the connecting surface between the two flanks. Such a design of the V-shaped rib bow allows the introduction of different shapes of the rib arch cross-section changing element in the space between the two flanks. The open area between the flanks of two consecutive rib bows depends on the number of ribbed bows.

In one embodiment, the rib-arch cross-section change element is designed as a curvature directed in the space between the flanks, which extends approximately parallel to the longitudinal extension of the flanks. This has the advantage that the cross section of the rib bow is changed in width, whereby all flow channels have the same cross section. Thus, cross-sectional shapes are prevented with large cross-sections, which prevents the formation of a jet. As a result, a better cross-exchange takes place, whereby the heat exchange is also improved.

The use of a bulge as a rib-arch cross-section altering element enables easy production of the rib-arch cross-section altering element.

Alternatively, the rib-arch cross section changing element is designed as a web directed in the space between the flanks, which web extends approximately parallel to the longitudinal extension of the flanks.

This embodiment also represents a change in cross section of the fin arch in width and allows the uniform formation of all the flow channels formed by the flanks with one and the same cross-sectional shape, whereby the formation of jets is prevented.

Advantageously, the rib-arch cross section variation element extends to approximately half the height of the gap between the flanks. As a result, a particularly symmetrical configuration of the rib is achieved in a simple production.

In a variant, the first and / or second connecting surface having the rib-arch cross-sectional variation element is curved, wherein the arched regions which enclose the rib-arch cross-sectional altering element point in an opposite direction to the rib-arch cross-sectional variation element. Characterized in that in the width of the V-like shape of the rib bow, an additional curvature or a web is introduced, the flow within the flow channels thus formed is made uniform.

In another embodiment, the fin arch cross-section change element is designed as a flap-like air guide. This has the advantage that a cross-sectional change takes place through the flap-like air-guiding element projecting into the intermediate space between the two flanks. This change in cross-section, directed into the depth of the fin arch, causes the flow of the medium, which moves along the first or second connection surface, to be deflected downwards into the region of the air slots, and thus to the transverse exchange of the flow of the medium within the through-flow Flanks formed flow channel can participate.

In one embodiment, the flap-like air guiding element is unfolded towards the intermediate space between the two flanks. This unfolding affects the air flow in the depth of the gap.

Advantageously, an angle of the unfolding of the flap-like air guiding element to the connecting surface depends on the depth of the respective rib bow. Thus, the angle of the unfolding can be determined depending on the application of the heat exchanger, so that the heat exchanger allows a reliable heat exchange in each operating condition.

In particular, the flap-like air guide element is punched out of the connection surface, which allows a particularly simple production of the air guide element.

The invention allows numerous embodiments. One of them will be explained in more detail with reference to the figures shown in the drawing.

It shows:

1 : Illustration of a heat exchanger

2 : Composite of rib and tube of the heat exchanger after 1

3 : Design of a rib for the flow engagement in the depth

4 : Design of a rib for flow engagement in width

Identical features are identified by the same reference numerals.

In 1 is a heat exchanger 1 , in particular a coolant cooler, shown, which consists of a block 2 exists between two containers designed as water tanks 3 . 4 is arranged. Every container 3 . 4 has a bottom 5 . 6 on, on which the block 2 , which by a side part 7 is completed, connects. The block 2 consists of several tubes 8th and several ribs 9 , where pipe 8th and rib 9 always alternately arranged to each other. The container 4 has a nozzle 11 on, in which a, derived from the not further shown internal combustion engine and heated by this cooling medium flows through the pipes 8th of the block 2 to the second container 3 is directed. Through the block 2 , especially the ribs 9 , a gaseous medium, preferably air, is passed, which passes the heat through the tubes 8th flowing cooling medium absorbs and heat from the heat exchanger 1 dissipates. In this way, the cooling medium is cooled. The second container 4 3 of the heat exchanger 1 into which the cooled cooling medium flows comprises a further neck 10 through which the cooling medium from the heat exchanger 1 discharged and returned to the internal combustion engine.

In 2 is a composite of the rib 9 and the tube 8th shown in more detail, from which it can be seen that the rib 9 from several v-shaped ribbed bows 9a consists. The alternating arrangement of pipes 8th and ribs 9 allows a high efficiency of the heat exchanger 1 in heat dissipation.

In 3 is a V-like rib 9 shown in which a rib bow 9a from two flanks 12 . 13 exists, with each flank 12 . 13 several louvers 14 transverse to the direction of flow through the rib bow 9a are formed flowing medium. The flow direction of the medium through the ribbed bows 9a is provided in the X direction.

The two flanks 12 . 13 of the costal arch 9a are at an acute angle to each other, wherein they are spaced from each other at the bottom by an open area Y. At the top are the flanks 12 . 13 of the costal arch 9a through a connection surface 15 connected with each other. On the flanks 13 closes a second interface 16 at. The flanks 12 . 13 and the connection surfaces 15 . 16 form the costal arch 9a , The, the flanks 12 and 13 connecting interface 15 . 16 is flat and facing the open area Y, with which the flanks 12 and 13 at their foot or head opposite, a much wider extent.

In the longitudinal extension of the connection surface 15 respectively. 16 are consecutively a plurality of flap-like air baffles 17 elaborated, of which in the 3 only two consecutive air baffles 17 are shown. The flap-like air baffle 17 is from the interface 15 respectively. 16 stamped out, with three sides of the flap-like baffle 17 from the interface 15 respectively. 16 are triggered while the fourth side of the baffle 17 continue with the interface 15 respectively. 16 is connected and a bend edge 17a forms. Along this, transverse to the longitudinal extent of the flank 12 . 13 arranged bending edge 17a is the freely movable end of the air baffle 17 down into the gap 20 between the flanks 12 . 13 of the costal arch 9a directed in the way that this is transverse to the flow direction of the medium flowing through and thus causes turbulence. This positioning will do this on the air baffles 17 passing medium down into the area of the louvers 14 steered and can thus participate in the transverse exchange of heat. The free end of the baffle 17 points to the interface 15 an angle α of unfolding. This angle α of unfolding and the distances and lengths of the flap-like air baffles 17 depend on the depth of the ribs 9 and the critical operating condition of each case of use of the heat exchanger 1 while the open area Y depends on the rib density.

By improving the transverse exchange, the heat transfer from the, in the pipe 8th flowing cooling medium to the, the ribs 9 flowing through gaseous medium, which improves the efficiency of the heat exchanger 1 elevated. Through the flap-like air baffles 17 becomes the cross section of the costal arch 9a changed in depth, which suppresses the formation of jets.

In 4 is a second embodiment of the rib 9 shown, with a rib bow 9a also from two opposite each other at an acute angle inclined flanks 12 and 13 exists, with the flanks 12 . 13 have at their foot and / or head side an open area Y. This open area Y is the interface 15 . 16 opposite, which is many times wider than the open area Y. As already in connection with 3 explained, closes in this case to the flank 13 a second interface 16 on, with the costal arch 9a also from the flanks 12 . 13 and the first connection surface 15 and the second interface 16 is formed.

Around the cross section of the costal arch 9a to influence in its width, has each interface 15 respectively. 16 one vault each 18 . 19 on which is in the direction of the gap 20 the flanks 12 . 13 extends. Here are the vaults 18 respectively. 19 along the entire Longitudinal extension of the costal arch 9a educated. The vault 18 . 19 has a radius R _I , while more bulges 21 . 22 and 23 . 24 the connecting surfaces 15 . 16 have the radius R _A. The other vaults 21 . 22 and 23 . 24 close the vault 18 respectively. 19 and are formed in the opposite direction than the vaults 18 . 19 , The distance between the outer contours of the curvature 18 . 19 to the outer contours of the other vaults 21 . 22 respectively. 23 . 24 is called H In the width of the V-shape is the curvature 18 . 19 introduced, which has a width of Z> 0. Through this vault 18 . 19 an engagement takes place in the width of the cross section of the rib bow 9a and, accordingly, a flow engagement in which all the flow channels have the same cross-sectional shape, whereby the formation of the jet is prevented, since the flow velocity of the medium within all rib bends 9a is evened. The height H of the vault 18 . 19 depends on the rib height and the application of the heat exchanger 1 from. The radii R _A and R _I depend on the rib density and the rib height. Also in 4 illustrated rib 9 has not shown louvers on the flanks 12 . 13 on. The flanks of the vault may also contain louvers.

In a form not shown, the curvature 18 . 19 also be replaced by a web (Z = 0), which has the same influence on the cross section of the rib 9 and thus also on the flow behavior of flowing through the rib arches medium.

In addition to increasing the cooling capacity of the heat exchanger according to the invention 1 also the advantage that its depth or its rib density can be reduced while maintaining the cooling capacity.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 6968891 B2 [0003]
• US 2007/0012430 Al [0004]
• US 2009/0173480 A1 [0005]

Claims (10)

Heat exchanger, with a rib ( 9 ) and pipes ( 8th ) block ( 2 ), which between two containers ( 3 . 4 ), each rib ( 9 ) of several ribbed arches ( 9a ) and each rib bow ( 9a ) is formed approximately V-like and the, a rib bow ( 9a ) forming two flanks ( 12 . 13 ) each have several air slots ( 14 ) which transversely to the flow direction of a through the rib bow ( 9a ) flowing medium, characterized in that the two flanks ( 12 . 13 ) of the costal arch ( 9a ) via a first connection surface ( 15 ) and / or the opposite flanks ( 13 . 12 ) of two consecutive ribbed arches ( 9a ) via a second interface ( 16 ), the first ( 15 ) and / or the second interface ( 16 ) a ribbed cross-section altering element ( 17 . 18 . 19 ), which in the space ( 20 ) between the ribs ( 9a ) forming flanks ( 12 . 13 ) and / or the opposite flanks ( 13 . 12 ) of two consecutive ribbed arches ( 9a ). Heat exchanger, with a rib ( 9 ) and pipes ( 8th ) block ( 2 ), which between two containers ( 3 . 4 ), each rib ( 9 ) of several ribbed arches ( 9a ) and each rib bow ( 9a ) is formed approximately V-like and the, a rib bow ( 9a ) forming two flanks ( 12 . 13 ) each have several air slots ( 14 ) which transversely to the flow direction of a through the rib bow ( 9a ) flowing medium, characterized in that the two flanks ( 12 . 13 ) of the costal arch ( 9a ) via a first connection surface ( 15 ) and / or the opposite flanks ( 13 . 12 ) of two consecutive ribbed arches ( 9a ) via a second interface ( 16 ) and wherein each connection surface ( 15 . 16 ) is opposite to an open area (Y), which of the two flanks ( 12 . 13 ) formed by the connecting surface ( 15 . 16 ), wherein the extent of the open area (Y) between the two flanks (Y) 12 . 13 ) is less than the extent of the joint surface ( 15 . 16 ) between the two flanks ( 12 . 13 ). Heat exchanger according to claim 1 or 2, characterized in that the ribbed cross-section altering element ( 17 . 18 . 19 ) as one, into the space ( 20 ) between the flanks ( 12 . 13 ) directed curvature ( 18 . 19 ) is formed, which approximately parallel to the longitudinal extension of the flanks ( 12 . 13 ) expands. Heat exchanger according to claim 1 or 2, characterized in that the ribbed cross-section altering element ( 17 . 18 . 19 ) as a, into the space ( 20 ) between the flanks ( 12 . 13 ) directed web which is approximately parallel to the longitudinal extent of the flanks ( 12 . 13 ) expands. Heat exchanger according to claim 3 or 4, characterized in that the ribbed cross-section altering element ( 17 . 18 . 19 ) to approximately half the height of the intermediate space ( 20 ) between the flanks ( 12 . 13 ). Heat exchanger according to claim 3, 4 or 5, characterized in that the ribbed section altering element ( 17 . 18 . 19 ) first ( 15 ) and / or second interface ( 16 ) is curved, wherein the arching areas ( 21 . 22 ; 23 . 24 ), which the rib-arch cross section change element ( 17 . 18 . 19 ) in an opposite direction than the rib-arch section altering element (FIG. 17 . 18 . 19 ). Heat exchanger according to claim 1 or 2, characterized in that the ribbed cross-section altering element ( 17 . 18 . 19 ) as a flap-like air guide element ( 17 ) is trained. Heat exchanger according to claim 7, characterized in that the flap-like air guide element ( 17 ) to the intermediate space ( 20 ) between the two flanks ( 12 . 13 ) is unfolded. Heat exchanger according to claim 7 or 8, characterized in that an angle (α) of the unfolding of the flap-like air guide element ( 17 ) to the interface ( 15 . 16 ) from the depth of the costal arch ( 9a ) depends. Heat exchanger according to claim 7, 8 or 9, characterized in that the flap-like air guide element ( 17 ) from the interface ( 15 . 16 ) is punched out.

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