DE102005002417A1 - Heat exchangers, in particular intercoolers or coolant radiators for motor vehicles - Google Patents

Abstract

The invention relates to a heat exchanger ( 1 ), in particular a charge intercooler or coolant cooler for motor vehicles, which comprises a soldered block which is made of pipes ( 4 ), ribs and at least one pipe base ( 2 ), in addition to at least one plastic box ( 3 ) which has a wall ( 3 a) which extends in the cross-section and which is approximately U shaped and a surrounding flange ( 3 b). The box is mechanically connected to the pipe base over flange ( 3 b). According to the disclosure, reinforcing ribs are arranged on the inner side of the plastic box ( 3 ) in a transition area between the flange ( 3 b) and the wall ( 3 a).

Description

The Invention relates to a heat exchanger, in particular a charge air cooler or coolant radiator for motor vehicles according to the preamble of claim 1.

Known Heat exchanger, especially for Motor vehicles often point a soldered block, consisting of pipes, ribs and tubesheets, on which collection boxes Plastic are placed. The connection between the plastic boxes and the tube sheets is as a clamp or flare connection formed, between a flange of the plastic box and the tube sheet a seal inserted and through the box / floor connection is strained. Thus, the plastic boxes are tight and tight with the connected to metallic tubesheet.

A Such box / floor connection was made by DE-B 28 52 408 the Applicant known, with deformable edge regions of a tube sheet over a Grasp flange of a water box and thus produce a positive connection. The plastic boxes tend to be elevated Internal pressure to deformations and to increased voltages, in particular above the clamping area, which also leads to leaks in the box / floor connection to lead can.

In DE-A 38 41 470 of the Applicant was therefore a modified Flange area for a so-called Wellenschlitzbördelung proposed, wherein the wall of the box formed above the flange wavy is and thus leads to a stiffening of the longitudinal wall.

Especially for intercoolers, as they are z. B. were known from DE-A 198 57 435, occur higher internal pressures within plastic box, with an upward trend in future developments, so conventional Plastic crates not withstand this stress. Rather, deformations can occur, the increased voltages and cracking.

It Object of the present invention, a heat exchanger of the aforementioned Type, in particular its plastic box with regard to the internal pressure resistance to improve without significantly increasing the weight of the heat exchanger.

These Task is solved by the features of claim 1. According to the invention, it is provided that on the inside of the plastic box above the flange, d. H. in the transition area between flange and box wall a variety of stiffening ribs is provided. As a result, the advantage is achieved that the plastic box at increased Internal pressure in the critical area stiffened and against deformation more resistant becomes. This will be in this area of the box above the box / floor connections Voltage peaks on a permissible Value reduced. In particular, a plastic box according to the invention is stiffened as intercooler usable.

In advantageous embodiment of the invention, the plastic box a U-shaped Cross-sectional profile on which over a paragraph merges into the circumferential flange. In the corner of about obtuse trained paragraph are on the inside the Stiffening ribs arranged, wherein the inner edge is preferably aligned with the U-profile of the inner wall of the box. This will the advantage is achieved that the stiffening ribs in one area are arranged, where they are flowing through the box medium medium, ie coolant or charge air does not oppose any appreciable flow resistance, d. H. the stiffening ribs according to the invention cause no increased pressure drop in plastic box. They also do not cause significant weight gain, because the wall thickness of the box itself is not enlarged and the ribs are relatively thin-walled are formed. They increase thus relatively weightless and pressure loss free the moment of resistance in the critical area of the box due to increased internal pressure is burdened in particular by bending at this point.

In Advantageous development of the invention, the heat exchanger a block with a single or multi-row flat tube system, wherein the ends of the flat tubes received in passages of the tube sheet are. The stiffening ribs are spaced apart on which of the pipe pitch, i. the distance of the tubes, or an outer rib division, i.e. corresponds to the distance of ribs on the outside of the box. there can they Stiffening ribs either at the height of the pipes or between be arranged this. This results in a uniform stiffening the box longitudinal wall, which is adapted to the internal pressure load.

In a further advantageous embodiment of the invention, the transition region between the flange and the box wall in the longitudinal direction of the box is wave-shaped - as already known from the aforementioned DE-A 38 41 470 of the applicant. Advantageously, the stiffening ribs are arranged in the region of this wave profile, either in the region of indentations (wave troughs) or bulges (Wave crests) on the inside of the box. As a result, the advantage of further stiffening is achieved without significant increase in the pressure drop in the box.

In Another advantageous embodiment of the invention, the rib surfaces, the protrude into the interior of the plastic box, parallel to the Entformungsrichtung of the box. The rib profiles can thus be in the core of the Box to be incorporated, after the cumshot of the box in Entformungsrichtung and without the use of additional sliders pulled, d. H. can be removed from the mold. This has the advantage of lower manufacturing costs achieved because of the inventive design and arrangement the stiffening ribs no significant increase in price of the pointed tool he follows.

One embodiment The invention is illustrated in the drawing and will be described below described in more detail. Show it

1 a detail of a heat exchanger according to the invention with connection between tube sheet and plastic box,

2 a detail X out 1 with stiffening ribs according to the invention,

3 a perspective view of the plastic box with a first arrangement of stiffening ribs,

4 the plastic box with a second arrangement of stiffening ribs,

5 a section of the longitudinal wall of the plastic box (first arrangement),

6 a section along the line VI-VI in 5 .

7 a section of the longitudinal wall of the plastic box (second arrangement) and

8th a section along the line VIII-VIII in 7 ,

1 shows a section of a heat exchanger according to the invention 1 who has a tubesheet 2 , a plastic box 3 and flat tubes 4 which has in passages 2a of the tube bottom 2 are included. The tube sheet 2 has - as known from the prior art - an outer circumferential groove 2 B on, to which an outer edge area 2c followed. The plastic box 3 has a not fully illustrated U-profile with a wall 3a on which into a flange 3b merges with larger wall thickness. The flange 3b and a seal, not shown, are in the gutter 2 B of the tube bottom 2 inserted and through the deformable edge area 2c by a non-illustrated crimping or clamping connection against the tube sheet 2 braced. Such box / floor connections are known from the aforementioned prior art, for. B. from DE-A 38 41 470. The flat tubes 4 are not shown with corrugated fins and the passages of the tube sheets, of which only the tube sheet 2 partially visible, soldered to a block. On the soldered block are the plastic boxes, of which in turn only the box 3 partially shown, put on and braced.

2 shows a detail X from 1 ie a transition area 5 between the wall 3a of the plastic box 3 and the flange 3b , where the transition 5 formed as a paragraph and the inner edge 3d the Wall 3a about a wall thickness relative to the inner edge 3e of the flange 3b is offset inwards. By the paragraph 5 receives the plastic box 3 So a so-called collection. In the area of the paragraph 5 are on the inside of the box 3 stiffening ribs 6 arranged, the inner edges 6a with the inner edge 3d the box wall 3a aligned. The stiffening ribs 6 thus fill the obtuse angle of the heel 5 and reach into the area of the flange 3b , Due to the arrangement of the stiffening ribs 6 becomes a stiffening of the box in the transition area 5 achieved, ie in a region which is subject to an increased load due to the internal pressure. The heat exchanger 1 is preferably designed as a charge air cooler and therefore with compressed charge air of about 2 bar (with increasing pressures is expected in the future) acted on, which leads to a critical stress of the plastic box in the area above the flange - but counteract the stiffening ribs according to the invention, without an increase in the wall thickness, ie without a significant weight gain of the box 3 ,

3 shows a perspective view of the corner of a plastic box 7 with stiffening ribs according to the invention 8th on the inside of a longitudinal wall 7b , The box 7 has a rectangular, not shown, circumferential flange 7a on, above which a wave-shaped transition region 9 is arranged, as it is known from the aforementioned DE-A 38 41 470 of the applicant - the latter disclosure is therefore fully incorporated in the disclosure of this application. The connection between tube bottom and box, not shown 7 corresponds to the known embodiment in this publication. Due to the wel lenförmigen training of the transition region 9 arise on the inside of the box 7 indentations 10 and bulges 11 , The stiffening ribs 8th are above the indentations in this first embodiment 10 arranged.

4 shows a second embodiment of the arrangement of stiffening ribs 12 in a plastic box 13 , which also has a wavy transitional area 9 has, according to the transition region described above 9 in 3 , Therefore, on the inside of the box 13 also indentations 10 and bulges 11 formed, which form the wavy wall profile. The stiffening ribs 12 are here in the area of the bulges 11 arranged, ie on the raised areas of the box inner wall and in each case between two indentations 10 , In this respect, here is the length of the stiffening ribs 12 greater than in the embodiment according to 3 , In both embodiments, ie the stiffening ribs 8th and the stiffening ribs 11 are their rib areas (corresponding to the area 6 in 2 ) are each formed parallel to each other, these surfaces approximately perpendicular to an imaginary tube bottom plane or through the circumferential flange 7a standing plane. This means that an unrepresented core in the manufacture of plastic boxes 3 . 7 . 13 in one direction, the so-called demoulding direction can be drawn. The arrangement and formation of the stiffening ribs 6 . 8th . 12 So does not require additional slides and can also be made possible by changes to an existing tool.

5 shows a different view of the embodiment according to 3 ie a view of a section of the longitudinal wall 7b of the plastic box 7 with flange 7a , Above the flange 7a is the wavy transition area 9 indicated. The longitudinal wall 7b is on its outside by a transverse ribbing 7c stiffened.

6 shows a section along the line VI-VI in 5 ie through the flange 7a , On the inside of the longitudinal wall 7b are in the range of the wave profile 9 (see. 5 ) Indentations 10 and bulges 11 , so wave peaks and wave troughs formed. In each case between two bookings 11 are the stiffening ribs projecting vertically into the interior 8th arranged, as - in 3 recognizable - above the indentations 10 , The stiffening ribs 8th extend to a line 7d inside, which the inner contour of the longitudinal wall 7b forms. In this respect, the stiffening ribs are aligned 8th with the inner wall 7d , whereby a low pressure drop is ensured. The distance between the stiffening ribs 10 otherwise corresponds to the distance of the flat tubes, not shown. Ribs 8th also extend perpendicular to the plane of the drawing and are thus easily demoulded with the main core of the box.

7 shows a view of a section of the side wall 13a (see. 4 ) of the box 13 with wave profile 9 ,

8th shows a section along the line VIII-VIII in 7 through the flange of the box 13 , Through the wave profile 9 arise on the inside indentations 10 and bulges 11 on which the stiffening ribs 12 (see. 4 ) are arranged. The vertically inwardly projecting stiffening ribs 12 extend to an edge 13b , which is the inner edge of the longitudinal wall 13a (standing vertically on the drawing plane) corresponds. So the stiffening ribs protrude 12 not further than the longitudinal wall 13a even in the interior of the box and thus also cause no increased pressure drop for the flow medium, eg. B. charge air or coolant.

Claims (10)

Heat exchanger, in particular intercooler or coolant radiator for motor vehicles, with a particular brazed block consisting of tubes ( 4 ), Ribs and at least one tubesheet ( 2 ), as well as at least one particular made of plastic or metal box ( 3 ), which has a cross-section in particular approximately U-shaped wall ( 3a ) and a circumferential flange ( 3b ) and over the flange ( 3b ) mechanically with the tubesheet ( 2 ), characterized in that on the inside of the box ( 3 ), in particular in a transitional area ( 5 ) between flange ( 3b ) and wall ( 3a ), Stiffening ribs ( 6 ) are arranged. Heat exchanger according to claim 1, characterized in that the transition region an inwardly directed, in particular peripheral paragraph ( 5 ) having. Heat exchanger according to claim 1 or 2, characterized in that the stiffening ribs ( 6 ) Inner edges ( 6a ), which with the inner wall ( 3d ) are formed in alignment. Heat exchanger according to claim 1, 2 or 3, characterized in that the tubes as round, oval or flat tubes ( 4 ), arranged in one or more rows and in the at least one tubesheet ( 2 ) and that the stiffening ribs ( 6 ) on the longitudinal walls ( 3a ) of the plastic box ( 3 ) are arranged at intervals corresponding to the pipe pitch or a Außenrippenteilung. Heat exchanger according to claim 4, characterized characterized in that the stiffening ribs ( 6 ) at the height of the tubes ( 4 ) are arranged. Heat exchanger according to claim 4, characterized in that the stiffening ribs ( 6 ) between each tube ( 4 ) are arranged. Heat exchanger according to one of the preceding claims, characterized in that the transition region ( 9 ) is undulating and indentations ( 10 ) as well as bulges ( 11 ) on the inside and recessed areas on the outside of the plastic box ( 7 . 13 ), in which parts of the tubesheet engage positively. Heat exchanger according to claim 7, characterized in that the stiffening ribs ( 8th ) above the indentations ( 10 ) are arranged. Heat exchanger according to claim 7, characterized in that the stiffening ribs ( 12 ) in the area of the bulges ( 11 ) and between the indentations ( 10 ) are arranged. Heat exchanger according to one of the preceding claims, characterized in that the stiffening ribs ( 6 . 8th . 12 ) Have rib surfaces parallel to the demoulding direction of the box ( 3 . 7 . 13 ) are arranged.