WO2014180865A1

WO2014180865A1 - Base for a heat exchanger, in particular for a motor vehicle, and method for producing the base

Info

Publication number: WO2014180865A1
Application number: PCT/EP2014/059268
Authority: WO
Inventors: Haymo BRÖDER; Hicham Rouhana
Original assignee: Behr Gmbh & Co. Kg
Priority date: 2013-05-07
Filing date: 2014-05-06
Publication date: 2014-11-13
Also published as: DE102013208424A1; DE112014002309A5

Abstract

The invention relates to a base for a heat exchanger, in particular for a motor vehicle, comprising a plurality of passages (12) to receive tubes (8), wherein each passage (12) consists of two opposing substantially straight long sides (15) and two opposing narrow sides (16) which are convex, such as in particular approximately semicircular, wherein a rim (19) of a passage corner region (17) is formed between the long side (15) and the narrow side (16). In a base which reliably withstands thermal stresses, the rim (18, 18.2, 18.3) of the passage corner region (12) extends in a straight line relative to a base plane (A) spanned by the long sides (15) or is formed such that the rim (18, 18.2, 18.3) extends in a convex manner with respect to the base plane (A) above the base plane (A) spanned by the long sides (15).

Description

Floor for a heat exchanger, in particular for a motor vehicle and

Process for the preparation of the soil

description

Technical area

The invention relates to a floor for a heat exchanger according to the preamble of claim 1 and a method for producing a floor for a heat exchanger according to the preamble of claim 8.

PRIOR ART DE 28 39 142 A1 discloses a finned tube arrangement for heat exchangers, in which the tube is inserted into a rib having a slot for receiving the tube. The flat flanks of the tube are elastically braced against the corresponding edge zones of the rib. The longitudinal edges of the openings of the rib run in a curved manner to each other and are convexly inflected against each other, so that there is a special adhesive strength between the pipe and rib.

DE 33 18 960 A1 shows a bottom for the tank of a tube heat exchanger and a tool for its production. To ensure better soldering of the pipes to the ground, every draft includes for receiving the pipe a joining nozzle. The joining nozzle has two centerpieces with a rectangular cross-section at an obliquely inwardly placed stump surface and low end pieces, wherein the profile transition is marked on the outside of the joining nozzle, whereby the liquid solder reaches a maximum of surface during soldering

A floor for a heat exchanger is disclosed in DE 10 2008 033 594 A1, wherein the floor comprises a plurality of openings and each opening is provided with a peripheral edge. The opening serves to receive a tube and is sealingly connected to the ground along the rising edge. As a result of a change in the height of the edge, a better distribution of thermal expansion caused by the pipe introduced into the joint force is to be achieved.

In the described trays for heat exchangers, the draft, in each of which a tube is inserted, produced by tearing or perforation in the ground. The punching method used for this purpose creates a boundary on the narrow side of the passage, due to the inlet radius of the drawn floor. The radius is structurally determined, in particular as a result of the installation depth or the forming technique so that the punch used to form the passage in the total opening width of the passage extends into this radius. The rupture point in the form of the boundary is arched downwards by the tool. When soldering the tube 8 with the passage this has a negative effect, since the solder LF runs with the boundary down, resulting in the narrow side of the pipe to an increased bend at this point and thus to a pipe failure. (Figure 5).

Presentation of the invention, object, solution, advantages It is the object of the invention to provide a floor for a heat exchanger, in particular for a motor vehicle, which has a pipe-floor connection, which reduces forces that occur as a result of temperature changes and mechanical stress.

This is achieved with the features of claim 1.

An embodiment of the invention provides a floor for a heat exchanger, in particular for a motor vehicle, comprising a plurality of passages for receiving tubes, each passage of two opposing substantially straight longitudinal sides and two opposite, curved, in particular approximately semi-circular, formed Narrow sides, wherein a boundary of a Durchzugseckbereiches between the longitudinal side and the narrow side is formed, wherein the boundary of the Durchzugseckbereiches a straight course to one of the longitudinal sides spanned base plane 'or curved above the plane formed by the longitudinal sides base plane is designed to run towards the base plane. This has the advantage that at the pipe-ground connection, a better distribution of the thermally induced stresses, since an approximately ideal Lotverlauf is achieved, which is why a demolition between the pipe and the floor is prevented because the narrow passage side is relieved, this solution applies all types of heat exchangers, especially in vehicle construction. It is suitable for heat exchangers with soldered and / or welded collecting boxes as well as heat exchangers with a bottom-box connection, which are not soldered or welded, but by a connecting element, such as e.g. a seal and a plastic box, are connected.

It is also advantageous if the straight base plane (A) is defined by the two longitudinal sides arranged parallel to each other, which at the Inlet side of the floor is arranged, from which pipes are inserted into the ground.

Advantageously, the curved course of the edge of the Durchzugseckbereiches forms a convex line which connects tangentially to the, stretched from the longitudinal sides straight base level With such a design of the boundary of the Durchzugseckbereiches the soil a straight formation of the plumb line is guaranteed, so that break points between passage and Pipe to be avoided

Alternatively, the base plane is formed convex, wherein the boundary of the Durchzugseckbereiches forms a tangential transition with the base plane. In such a design of the boundary of the Durchzugseckbereiches forms during the soldering process between the bottom and pipe an upward, curved plumb line.

In one embodiment, a diameter of the approximately semicircle-shaped narrow side is smaller than half the difference of a length of the longitudinal side and a width of the narrow side of the passage. This ensures that the forming tool, which produces the passage within the floor, can always intervene in the total opening width up to the radius range and in one step a passage is made, which is adapted to the dimensions of the pipe to be inserted.

In one variant, approximately at the height of the boundary of the passage corner region, a chamfer formed on the passage follows. The local embossing of the chamfer supports insertion of the tube into the passage. A development of the invention relates to a heat exchanger, comprising a collecting box, which has a bottom, wherein approximately perpendicular to the bottom at least one tube engages in a, formed in the bottom passage, which comprises one end of the tube. In such a heat exchanger, cracks between the soil and the pipe due to attacking thermally induced stresses are reduced when the soil is designed according to one of the features of the present patent application. Advantageously, the heat exchanger is designed as a coolant radiator of a motor vehicle. In motor vehicles are particularly high demands on the heat exchanger performance for a given space size and the weight of the heat exchanger. At the same time, a very high degree of operational reliability must be ensured, which ensures a long service life of significantly more than 10 years without occurrence of leakages under unfavorable weather conditions and influences of corrosive substances. These properties can be increased overall by the improved connection of pipe and soil. A further development of the invention relates to a method for producing a floor for a heat exchanger according to at least one of the preceding claims, in which the floor is formed in one or more forming steps and a plurality of passages are introduced into the floor. A simple method for the production of the soil is characterized in that after the introduction of the passages each passage in the region of a boundary of the Durchzugseckbereiche is imprinted, so that the boundary of the Durchzugseckbereiche has a straight course to a plane defined by the longitudinal side base plane or above that of the Longitudinal side spanned bast layer is formed arched. As a result, a demolition between the floor and pipe is reliably prevented, as by the defined imprint of the boundary of the Durchzugseckbereiches a reduction of the thermally induced stresses at the pipe-ground connection takes place, resulting in an ideal Lotlinienverlauf in the soldering of pipe and soil entraction Advantageously, in a forming step, a straight plane of the bottom is formed, wherein the boundary adjacent to the straight plane the Durchzugseckbereiche is imprinted before or after the formation of the passage. The re-embossing process is therefore easy to incorporate into the forming process for producing the passage in the ground, whereby a cost-effective method is realized.

In one embodiment, in the stamping of the boundary of the

Durchzugseckbereiches formed an approximately straight Unterkontaktlinie the passage to the tube when the width of the passage is smaller than the length of the passage, while the Nachprägung the boundary of the Durchzugseckbereiches a curved Unterkontaktlinie the passage is generated with the tube, when the width of the passage greater is as the length of the passage. Due to these described method steps can be decided depending on the expected load of the heat exchanger in the motor vehicle, which course the sub-contact line of the passage should have with the pipe to achieve an ideal Lotlinienverlauf in the subsequent connection and soldering of the soil with the pipe to the risk of To minimize tearing at the joints between pipe and floor.

Further advantageous embodiments are characterized by the following

Description of the figures and described by the subclaims. Brief description of the drawings

The invention will be explained in more detail on the basis of at least one exemplary embodiment with reference to the drawings, in which:

Fig. 1 representation of a heat exchanger, Fig. 2 shows a first embodiment of an inventive

3 shows a second embodiment of a floor according to the invention, FIG. 4 shows a schematic sequence of the production of the floors according to the invention according to FIG. 2 or FIG. 3, FIG. 5 pipe with soldering surface of a heat exchanger according to FIG

State of the art. Preferred embodiment of the invention

1 shows a heat exchanger 1, in particular a coolant radiator, which consists of a block 2 which is arranged between two containers 3, 4 formed as a water tank. Each container 3, 4, which are also referred to as manifolds, in this case has a bottom 5, 6, on which the block 2, which is completed by a side part 7, connects. The block 2 consists of a plurality of tubes 8 and a plurality of ribs 9, wherein tube 8 and rib 9 are always arranged alternately to each other. The container 3 in this case has a connection piece 10, into which a cooling medium derived from the combustion engine (not shown) and heated by it flows, which flows through the tubes 8 of the Blocks 2 is passed to the second container 4. Through the block 2, in particular the ribs 9, a gaseous medium, preferably air, is passed, which absorbs the heat of the flowing through the tubes 8 cooling medium, and dissipates the heat from the heat exchanger 1. In this way, the cooling medium is cooled. The second container 4 of the heat exchanger 1, in which the cooled cooling medium flows, comprises a further nozzle 11, through which the cooling medium is discharged from the heat exchanger 1 and returned to the internal combustion engine. In addition, only the conditions at the bottom 5 should be considered. However, the statements also apply to the bottom 6, Figure 2 shows a cross section through the container 4 with the bottom 5 and inserted into a passage 12 of the bottom tube 8. The bottom 5 has a circumferential groove 13, in which the container 4 engages. Between the container 4 and the circulation 13, a seal 14 for sealing the container 4 is attached. An opening formed on the bottom 5, which is referred to as a passage 12, in this case has a longitudinal side 15 and a narrow side 18, wherein the two longitudinal sides 15 and the two narrow sides 16 are approximately parallel. In the present case, the straight longitudinal side 15 spans a base plane A. The subsequent to this base plane A Durchzugseckbereiche 17, which can be seen in the plan view in Figure 2b are formed semicircular. The diameter d of these semicircular Durchzugseckbereiche 1 7 is greater than or equal to half a difference between a length of the passage L and a width B of the passage 12. The Durchzugseckbereiche 17 have, as can be seen from Figure 2b and 2c, at a lower contact line c _{b of} the passage 12 with the bottom 5 a boundary 18. The originally to the pipe 8 facing edge 18.1 of the Durchzugseckbereiches 17, as is known from the prior art, according to the invention has a straight course 18.2 with the straight base plane A, which by the longitudinal side 15 of the passage 12th is spanned. Alternatively, the boundary 18.3 of the Durchzugseckbereiches 17 also be tangentially pronounced in the opposite direction from the base plane A, wherein this tangential boundary 18.3 of the Durchzugseckbereiches 17 connects to the straight base plane A.

The straight base plane (A) is defined by the two mutually parallel longitudinal sides, which is arranged on the insertion side of the floor, from which pipes can be inserted into the ground. The base plane is thus arranged on the outside of the floor and directed towards the tube block.

In the connection of such a passage 12 with a tube 8 ensures that when soldering the tube 8 with the bottom 5, a straight line is formed. The chamfers 19 shown in FIG. 2c, which are arranged locally on the passage 12 and directly adjoin the respective boundaries 18.2, 18.3 of the passage corner area 17, stabilize the passage 12 in the passage corner area 17 and assist the introduction of the tube 8 into the passage 12.

Figure 3 shows a second embodiment of the floor according to the invention, in which the bottom 20 is bulged in the direction of tube 8 with the sub-contact line c _b . The boundary 18.2 or 18.3 follows the bulge of the longitudinal side 15 of the passage 12 either straight to the base plane A or concave shaped above the base plane A to the curved bottom 20, in particular the Unterkontaktfinte c _b . Also in this embodiment, a bevel 19 on the passage 12 in Durchzugseckbereich 17, wherein there is a plumb line with straight or vaulted transition, whereby even with so bulging Unterkontaktlinien c _{b of} the bottom 20 is a reduction of the break between the bottom 20 and pipe. 8 takes place at the Durchzugseckbereichen 17. FIG. 4 shows the sequence of production of the base 5, 20 explained in connection with FIGS. 2 and 3. The base 5, 20 is a flat component in step a, preferably a metal sheet, which corresponds to the required size is tailored. In a second step b, this component is deep-drawn into a profile in which a straight plane E is formed centrally, which is laterally bent by the radius R by approximately 90 °, whereby legs 13, 1 are formed. To the legs 13.1 is followed in each case a perpendicular thereto web 13.2, which runs parallel to the straight plane E. The web 13.2 is raised in a third step c parallel to the leg 13.1 with an edge 13.3, whereby the circumferential groove 13 is formed, in which later the seal 14 is inserted.

In the subsequent step d takes place to form the passage 12 a tearing in the straight plane E, which takes place with a punching tool. There are two possibilities. In a step d 1, the tearing takes place in a region b, which is arranged within the straight plane E, wherein the width of the region b is smaller than the width B of the straight plane E. In this case forms a subcontact line c _{b of} the passage 12, which is formed after complete assembly of the heat exchanger 1 with the tube 8, a straight line.

In an alternative step d2, a punching tool is used whose width b is greater than the width B of the straight plane E. As a result, the subcontact line c _{b is formed} concave. That is, the sub contact line c _b expands in the radius R of the bottom 5, 20. Since in the formation of the passage 12 in the process step d always a boundary 18 in the Durchzugseckbereich 17 is formed, which points in the direction of the tube 8 away from the straight plane B down, re-embossment of the boundary 18 is necessary. In step f, when step d1 has been carried out, the boundary 18 of FIG Marked through corner region 17, so that the edge 18 pointing in the direction of pipe 8 is straight and lies in the base plane A, which is spanned by the longitudinal side 15 of the passage 12 (step f1). If step d2 has been carried out, the subcontact line c _b concave and thus slightly curved, so that the boundary 18 of Durchzugeckbereiches 17 tangentially abuts the lower contact line c _b (step f2) The original boundary 18.1 is pressed in the direction of arrow P to form the desired shape. Such a stamping can be achieved in particular by a circumferential bone stamp.

Alternatively, the method steps f1 or f2 can already be carried out between the method steps c and d, i. be carried out before the punching process, so that immediately after punching the desired course of the Durchzugseckbereiches 1 7 results.

Due to the described embodiments of the boundary 18 of the Durchzugseckbereiches 17 an ideal course of the plumb line is achieved in the merging of tube 8 and bottom 5, 20 which holds in particular the change of temperatures or thermally induced stresses well and thus a demolition between the floor and pipe prevented.

Claims

claims

1, floor for a heat exchanger, in particular for a motor vehicle, comprising a plurality of passages (12) for receiving tubes (8), each passage (12) of two opposing substantially straight longitudinal sides (15) and two opposing, curved, as in particular approximately semicircle-like, formed narrow sides (16), wherein a boundary (19) of a Durchzugseckbereiches (17) between the longitudinal side (15) and the narrow side (16) is formed, characterized in that the boundary (18, 18.2, 18.3 ) of the Durchzugseckbereiches (12) has a straight course to one of the straight longitudinal sides (15) spanned base plane (A) or above the plane of the longitudinal sides (15) spanned base plane (A) arched to the base plane (A) running towards.

2. Floor according to claim 1, characterized in that the straight base plane (A) is arranged on the insertion side of the floor, from which pipes can be inserted into the ground.

3. Floor according to claim 1 or 2, characterized in that the curved course of the boundary (18.2) of the Durchzugseckbereiches (17) forms a convex line which connects tangentially to the longitudinal sides of the (15) spanned straight base plane (A).

4. Floor according to claim 1 or 2, characterized in that the base plane (A) is convex, wherein the boundary (18) of the Durchzugseckbereiches (17) forms a tangential transition with the base plane (A).

5. Floor according to claim 3 or 4, characterized in that a diameter (d) of the approximately semicircle-shaped narrow side (18) is smaller than half the difference of a length (L) of the longitudinal side (15) and a width (B) of Narrow side (16) of the passage (12).

6. Floor according to one of the preceding claims, characterized in that approximately at the height of the boundary (18) of the Durchzugseckbereiches (1 7) on the passage (12) formed chamfer (19) adjoins.

7. A heat exchanger, comprising at least one container (3, 4), which has a bottom (5, 6), wherein approximately perpendicular to the bottom (5, 6, 20) at least one tube (8) in one, in the bottom (5, 6, 20) engages trained passage (12) which comprises one end of the tube (8), characterized in that the bottom (5, 6, 20) according to at least one of the preceding claims 1 to 6 is configured.

8. Heat exchanger according to claim 7, dadyrch in that the heat exchanger (1) is a coolant radiator of a motor vehicle.

9. A method for producing a floor for a heat exchanger according to at least one of the preceding claims, wherein the bottom (5, 20) formed in one or more forming steps and in the bottom (5, 20) a plurality of passages (12) are introduced, characterized in that after introduction of the passages (12) each passage (12) in the region of a boundary (18) of the Durchzugseckbereiche (17) is imprinted, so that the boundary

(18) of the Durchzugseckbereiche (17) has a straight course to one of the longitudinal sides (15) spanned base plane (A) or above the plane defined by the longitudinal sides (15) base plane (A) arched towards the base plane (A) is formed running.

10. The method according to claim 9, characterized in that in a forming step, a straight plane (E) of the bottom (5, 20) is formed, wherein the adjacent to the straight plane (E) boundaries (18) of the Durchzugseckbereiches (17) before or after the formation of the passage (12) be imprinted.

1 1. A method according to claim 9 or 10, characterized in that in the stamping of the boundary (18) of the Durchzugseckbereiches

(12) an approximately straight subcontact line (c _b ) of the passage (12) with the tube (8) is formed when the width of the passage (12) is smaller than the length of the passage (12), while in the Nachprägung the boundary (18) of the Durchzugseckbereiches (17) a curved Unterkontaktünie (c _b ) of the passage (12) with the tube (8) is generated when the width of the passage (12) is greater than the length of the passage (12).