FR2651308A1 - HEAT EXCHANGER FOR MOTOR VEHICLES. - Google Patents

Abstract

In an exchanger comprising at least one finned unit (1, 2) arranged between two water boxes (3, 4), at least one return line connected to a water box (3) and at least one inlet line connected to the other water box (3, 4), and at least one through pipe (14) connected to one of the water boxes (3, 4) and equipped with an inlet or return connection ( 12, 13) for the inlet or return pipe, the through pipe (14) and the water boxes (3, 4) are made of plastic, and the through pipe (14) can be connected and to the door bottoms - tubes (6, 8) of the water boxes and to the cover (5, 7) of the water box (3, 4) by means of plastic deformation, gluing or welding. Application in particular to air conditioning and heating installations for passenger vehicles.

Description

1 2651308

  The invention relates to a heat exchanger

  of a heating circuit for motor vehicles,

  including an air-conditioning and heating system

  for passenger cars, comprising at least one finned block disposed between two water boxes, at least one return line connectable to one of the water boxes and at least one arrival line

  which can be connected to the other water box, and

  both at least one through pipe that is connected to

  one of the water boxes and is equipped, in particular with the

  the other water box, an inlet connection or

  back for the arrival or return pipe.

  A heat exchanger of the type

  diqué above for example in passenger cars to heat the passenger compartment of the vehicle. In particular embodiments having two blade blocks, the left part can be heated separately.

  and the right side of the passenger compartment of the vehicle, the

  sagers then determine if and with what intensity a heat exchange fluid, is sent to one of the boxes

  by means of a through-line

  mune, which is connected in this case to the inlet pipe and therefore represents an upstream pipe, and, after passing through the different blocks of fins, is discharged into the return pipes, which are connected

to the other water box.

  Such described heat exchangers are known (DE-34 03 335 A1, G 84 02 761.4), but have several disadvantages. The heating of the radiating fins as well as the air passing through the heat exchanger must be carried out using only the fluid

  heat exchange which circulates in the tubes of

rents blocks.

  Because of the use of

  and the provision of that

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  inside the fin blocks, the thermal decoupling arrangements must be

  thermal influence of the fins through the

  health. In already known heat exchangers, the through pipe must therefore be protected against any flow of air, as is done for example by means of a coating and a separation.

  and a corresponding conformation of the edges of the

  in the area of the through pipe.

  Another disadvantage must be found in the fact that it is necessary to make sealing arrangements for fixing the through pipe

  to the water box so that the seal of the sepa-

  ration is guaranteed even in the case of pressure from

service quite high.

  The invention aims to develop an exchange of

  heat of the type indicated above allowing

  to avoid the disadvantages described, which allows a

  more efficient thermal coupling of the duct

  compared to the fin blocks and a better fixation of the through pipe in the water box, without the implementation of additional sealing provisions. This problem is solved thanks to the fact that the through pipe and the water boxes are made of a plastic material, in particular a thermoplastic, and that the through pipe can be connected to the bottom of the tube holder of the water box and the funds bearing tubes and the water box lid by means of plastic deformation, gluing or welding. Thanks to

  the use of a through pipe in plastic material

  ticks and plastic water boxes, not only

  The result is a cheaper manufacturing of

  the heat exchanger in relation to the form of

  known until then, but it is also

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  possible to pass the through pipe, medium-

  a comparatively low manufacturing expense, without being removed from the fins, between the fin blocks and removing other provisions for protecting the duct from the airflow.

  crossing, since thermal transfer through

  towards the plastic pipe does not occur as is the case with known metal constructions

  until then. The use of the described methods of connection

  its purpose for connecting together the elements of the water boxes as well as between the tube holder of the water box and the through pipe on the other hand provide an assured connection, which does not need to be

  additionally sealed between these elements. These

  transferred from the junction or connection may be further

  teged in an extremely simple way into automated manufacturing cycles so that one can get

  a further reduction in the cost of manufacturing

  such heat exchangers described.

  As complete an embodiment of the heat exchanger as possible can be obtained by virtue of the fact that the water boxes can be superimposed, that

  the upper water box may have at least one

  return line, to which the

  tower can be connected, in a centered position between two parallel fin blocks, as an upstream pipe, to the lower water box and can be provided at the water box superior, of an inlet connection for the

arrival pipe.

  Since we can provide two blocks

  side-by-side fins, which can be

  to separate heating circuits and whose

  common letters may be completely or partially

  separated by slots parallel to the air flow direction, that the upper water box may have two separate chambers for a return line and for the lower water box, respectively, and that the through pipe may extend through recesses, having a corresponding cross-section, fins between the fin blocks, it is

  possible to use a heat exchanger of the type indicated

  higher up in motor vehicles so

  that the heat exchanger makes it possible to obtain heat

  different fages of the left and right parts of

  the passenger compartment of the vehicle and which is

  a compact design of the heat exchanger.

  An inexpensive assembly method is obtained for connecting the through pipe to the water box by virtue of the fact that in the tube bottom of the lower water box a continuous opening can be provided, which is adapted to the cross-section. of the

  through pipe and into which one end penetrates

  mity of this conduct, which can be fixed in

  opening preferably by means of ultrasonic welding.

  treads and friction welding. The advantage of the

  Ultrasonic drying is achieved by heating the tube base and the through-pipe for a short period of time uniformly at the point of the contact zone so as to obtain

  uniform tight connection of the surfaces of the joint of

  tion. This can also be achieved by the fact that the through pipe can be fixed frontally by one end on the tube bottom of the lower water box by welding, and surrounds a suitable opening

  the internal cross-section of the

  pouring and crosses the bottom tube holder. To facilitate the centering of the through-pipe in the opening provided in the tube-holder base and to obtain an improved connection between the two elements in a secure manner,

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  It is advantageous that the joining surfaces between

  the end of the through pipe and the bottom

  tubes can be arranged in the form of a connection

tongue and groove.

  For proper use of the heat exchanger mounting space, it is appropriate for the through-pipe to extend between the fin blocks, pass through a sealed bushing in the upper water box, and be bent in a re-entrant zone of the water box between the rooms. Therefore it is possible to install all connections for the supply and return lines

  on the upper water box, so that's unique-

  at the upper water box, it is necessary to carry out connection work. This latter advantage can also be obtained by virtue of the fact that the upper water box has a bend situated between the chambers and which comprises an inlet connection for the inlet pipe and an opening, which is located between the fin blocks. , passes through the tube holder bottom and serves to house and fix the upper end of the through pipe which extends according to a provision

  rectilinear between the water boxes. He is particularly

  Advantageously, the bend is shaped so as to be integrated in the lid of the upper water box and forms, in a sealed manner, a channel with the opening in the tube base. Therefore, it is possible to economize on an elbow to be provided separately, as well as its mounting, in which case there is the additional advantage that no particular sealing arrangement needs to be made between the lid and the elbow. The wall of the elbow, which forms the channel and encloses the opening is connected, by its

  front surface, at the bottom of the tube holder by welding or

lage.

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  In order to integrate two heating circuits to-

  separated in a heat exchanger unit.

  it is particularly advantageous to be able to

  see two separate through pipes, which are

  respectively laterally related to the fin blocks, to the lower water box and comprise, in the upper water box area, inlet connections for two separate inlet lines. Therefore, it is possible to send heat exchange fluids from two separate circuits to the lower common water box, through the corresponding through pipes, to mix in this water box and the then send to the different blocks of fins, depending on the amount through respectively set. We can also imagine that the

  lower water box as well as the upper water box

  has two separate chambers so that each ribbed tubular block is fed by a separate through pipe and can be drained through the return lines, which must be

  provided separately, from the upper water box.

  It is obvious that by reversing the layout of the

  construction point of view, it is possible to realize all the

  ropes at the level of the lower water box. This depends on the mounting conditions for such a heat exchanger described. It can further be noted that the

  Inlet line serves as a type of connection

  as an upstream line leading to the lower water box or the upper water box and may

  be connected to the supply line, or is used

  as a starting line from the lower or upper water box and can be connected to the

return conduct.

  Other features and benefits of the

  present invention will emerge from the description given

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  hereinafter referenced to the accompanying drawings, on the

  which: - Figure 1 shows a representation in

  schematic perspective of a heat exchanger

  both a through pipe connected to the lower water box and used as an inlet pipe and which is

  bent in its upper part at the level of its

  in the upper water box; FIG. 2 represents a perspective view

  schematic of a second variant of the heat exchanger

  their, in which the through pipe used as upstream circuit is connected to the lower water box and opens into a bend of the upper water box;

  FIG. 3 represents a longitudinal section

  vertical section of the heat exchanger of Figure 2, in a view corresponding to the arrows III-III; - Figure 4 shows a cross section

  horizontal plane of the heat exchanger of FIG.

  a view along arrows IV-IV; FIG. 5 represents a perspective view of another variant of a heat exchanger comprising two rectangular through-ducts extending along the transverse sides of the heat exchanger and constituting an upstream circuit; FIG. 6 represents a cross-section of a first embodiment of the connection between

  the tube bottom of the water box and the driving

  payer; - Figure 7 shows a second variant of the connection between the tube holder bottom of the water box and the through conduit; 8 shows a third variant of the connection between the tube holder bottom of the water box and the through pipe which is still fixed in the tube holder bottom; and

8 2651308

  FIG. 9 shows another variant of the possible embodiment of junction zones between the tube holder base and the lid of the water boxes,

  according to details IX and X in FIG.

  The heat exchanger shown in Figures 1,2,5 is used for the heating or air-conditioning system of a passenger vehicle, for example to provide different heating of the left and right parts of the vehicle. cabin of the vehicle. For this purpose, the heat exchanger comprises two blocks of fins 1 and 2 arranged side by side, each of which is formed by a multiplicity of parallel tubes 9 on which are fixed thin transverse fins 10. The ribs and tubes 9 are made of aluminum. The tubes

  9, which, if not, are equipped with provocative inserts

  as turbulence, open, by their ends, in an upper water box 3 and in a lower water box 4. The water boxes 3, 4 are preferably formed of injection molded parts in two elements,

  made of a plastic material, in particular a heat

  heat resistant moplaste with good aptitude

  welding. However, it is also possible to use

  very plastics for the manufacture of these water boxes. The lower water box 4 is constituted

  by a tube base 8 and a cover 7, which

  carry respective circumferential flanges of

  25 and 26 and are connected by means of these flanges.

  In Figure 3 as well as in another variant of the

  FIG. 9 shows a possible embodiment of

  sible junction areas between the flanges 25,26. The junction of the cover 7 with the tube holder base 8 can be achieved by welding, gluing or by means of a

  other suitable method of joining, in which case it is

  holds a continuous junction cord, which makes it superfluous

  additional sealing between the elements 7,8.

  In the tube holder bottom 8, the lower ends of the tubes 9 are received in holes having identical cross sections and are sealed in these holes, in particular by means of a widening or an insertion. by dint of their

  ends in the mouth area.

  The upper water box 3 corresponds to a very large extent to the lower water box 4, with the difference that the latter comprises two chambers 11, 11 ', unlike the embodiment of the lower water box 4 who has only one

  room 11 "to make the rooms 11,11 ', as

  shown in FIG. 5, the lid 5 of the upper water box 3 has a partition wall 24 which is sealingly connected to the bottom of the tube holder 6 so that two chambers 11, 11 'are preferably obtained.

  identical. Other embodiments are

  FIGS. 1 and 2, in which the cover has a recess-shaped recess area 27 transversely to the longitudinal direction of the water box 3, whereby the chambers 11, 11 'are separated from each other

  by a free space. The chambers 11, 11 'comprise each

  a return fitting 13, 13 ', to which can be connected

  roped respectively a return line for the heat exchange fluid. The tubes 9 are inserted into the tube base 6, in the same way as in the

  bottom tube holder 8 of the lower water box 4.

  To feed the lower water box 4 with

  the heat exchange fluid or with the water of

  cooling of the motor vehicle (in the case of its use as a radiator), there is provided a through pipe 14, which is parallel to the tube 9 of the fin blocks 1, 2 and can be connected to an inlet pipe, in the area of the upper water box 3,

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  via a corresponding inlet connector 12. Therefore, the through pipe 14 is called an upstream pipe or go. As shown in Figures 1 to 4, the through conduit 14 is disposed between the fin blocks 1, 2 and is in the form of a cylindrical tube. The driving

  14, which is made of a plastic material

  In particular, a thermoplastic material may be connected to the bottom tube holder 8 of the lower water box 4 by carrying out various methods of

  junction. If the tube base 8 and the driving line

  14 are made of the same thermo

  it is particularly suitable to use for the assembly the ultrasonic welding process as well as the friction welding process. Other methods of sealing the through conduit 14 at the bottom

  tube holders 8 include the bonding of the ends

  of the through-pipe in a corresponding bore

  from the bottom of the tube holder. As shown in more detail in Figures 6 to 8, different

  embodiments of the connection between the bottom

  tubes 8 and the through conduit 14 are possible.

  In FIG. 7, the tube base 8 has a continuous opening 15, which is adapted to the section

  cross-section of the through pipe 14 and in the

  what penetrates the end of this through pipe.

  The cross-sectional dimensions of the opening 15

  are generally slightly larger than the ex-

  of the through-duct 14. The driving

  pourante 14 can be inserted in the opening 15 of ma-

  that the end of the pipe protrudes from

  firing from the front face of the tube holder bottom 8 or

  level mine with this background; we can also imagine

  that the end ends above the front face.

  In the case of the use of ultrasonic welding,

1 2651308

  uniformly heats the contact zone between the tube base 8 and the through conduit 14, during a

  brief interval of time, so that one gets a

  to a large extent homogeneous.

  Another type of embodiment of the connection between the tube holder base 8 and the through conduit 14 is shown in FIG. 6, in which the end of the through conduit 14 is applied frontally against the tube base 8 while being attached to this bottom, for example by means of rotating friction welding or

  way of a similar welding process. The bottom

  tubes 8 has a continuous opening 15 ', which is suitable for

  to the inner cross section of the through pipe 14 and forms, in the extension of the through pipe 14, a channel for access to the box.

  lower water 4. For the centering of the

  14 having the opening 15 ', the tube base 8 has a centering spout 18', which is arranged in the form of a ring around the opening 15 'and engages

  in a receiving groove 17 'correspondingly shaped

  laying down and arranged frontally in the

  Thus, a tongue and groove connection is obtained which is geometrically designed so that it is suitable for the welding conditions and

  allows a tight and secure connection between the bottom

  In FIG. 8, there is shown another connecting zone, at which the tube base 8 has a connecting pipe 16, which is approximately adapted to the cross section of the pipe. through 14 and on

  which the through pipe 14 is fixed frontal-

  tightly. For this purpose, unlike

  embodiment of Figure 6, the tubing of

  cord 16 has a receiving annular groove 17,

  in which engages a fixing nose 18 formed fron

12 2651308

  talement on the end of the through pipe 14.

  It is also possible to imagine other types of connection, for example in the case of the presence of flanges arranged with

  corresponding way, by screwing or the like.

  The through conduit 14 connected to the bottom tube holder 8 of the lower water box 4 passes through, in the embodiment of the heat exchanger shown in Figure 1, a passage 19, of suitable cross-section, of the box. upper water 3, which is formed in the recessed area 27 between the chambers 11,11 '. The through pipe 14 is bent

  in the recessed area 27 so that we ob-

  holds a connection of the inlet and outlet pipes

  only on one side of the heat exchanger. This makes it possible to have a heat exchanger having a

  particularly compact form, an additional advantage

  that it is sufficient to carry out

  connection only at the box

upper water 3.

  In another embodiment of

  the heat exchanger (FIGS. 2,3), the water box

  3 has an elbow 20 disposed in the portion

  recess 27 located between the two chambers 11,11 '.

  In the embodiment shown here, this bend is arranged to be integrated in the lid 5 of the upper water box 3, but may also be a separate component. The tube base 6 has a receiving opening 21, which is located between the fin blocks 1, 2, is adapted to the cross section of the through conduit 14 and serves to receive the tubular conduit 14 which extends with a rectilinear form between the materials 3,4. The fixing of the through conduit 14 in the bottom tube holder 6 can be achieved by means of

  of one of the link types already described. The upper zone

  the mouth of the through-pipe 14 in

1 3 2651308

  the tube base 6 is surrounded by the bend 20 in a sealed manner. The channel 22 thus formed opens into an inlet connection 12, to which the

arrival pipe.

  In Figure 5, there is shown another

  embodiment of the heat exchanger; this last

  nier has two separate through pipes 14 'and

  14 ", which are arranged on the sides of the

  1 and 2, and have separate inlet connections 12 ', in the area of the upper water box 3. As a result, it is possible to have an inlet of the heat exchange fluid by means of two pipes arrival

  which makes it possible to increase significantly the pos-

  adjustment possibilities of the two separate circuits for

  flow on the heat exchange. In the form of

  shown, the through pipes 14 ', 14 "pos-

  follow a rectangular cross-section, subdivided

  in multiple ways, and are connected to one

  similar to the manner previously described, at the bottom tube holder 8 of the lower water box 4. The through pipes 14 ', 14 "through bushings 19', having a corresponding cross section and

  located on the transverse sides of the water box

  3 and can be linked to this

  last in order to increase the rigidity of the link

  his. Thanks to the chosen realization of the pipes passing through

  14 'and 14', the latter simultaneously form two lateral guide surfaces 23, 23 ', so that the bending, normally provided, of the edges of the fins 10 (see FIG. 3) can be eliminated in order to obtain a closed area of air flow through the exchanger

heat.

  The heat exchange fluid sent by the

  14 through 14 ', 14 "through the lower water box 15 is distributed in the water box

14 2651308

* lower 4 between the two fin blocks 1 and 2. The return fittings 13,13 'are associated with valves of

  regulating the quantity

  In this case, the blades 1 and 2 are traversed at different speeds and therefore have different temperatures. In order to prevent a reciprocal influence of temperature between

  the fin blocks 1 and 2, the latter comprise

  respectively fins 10 of their own or

  the fins 10 are subdivided by parallel slots 28

  parallel to the air flow direction, in the separation zone of the fin blocks 1 and 2. Since the through-ducts 14, 14 ', 14 "are made

  made of a plastic material and are therefore misleading

  go heat drivers, it must be useless to

  implement special provisions for

  This prevents a temperature influence between the through-duct 14, 14 ', 14 "and the fins 10. Consequently, direct application of these parts against each other is possible. 1 and 2 fins passes through openings 29, having a corresponding cross section, formed in the fins without having to respect a particulardistance

from these fins.

  The choice of a plastic material as manufacturing material for water boxes and for driving

  is planned in common for the forms of reali-

  described. As a result, samples can be

  significantly cheaper heat generators since the bonding and joining processes, which are

  possible, allow, in relation to the types of

  previously known, to take place in a wide

  measure of the implementation of more

  the reciprocal thermal influence between the thermal conductor and the fin blocks is greatly reduced, so that

  may not implement additional provisions

protection.

  It is possible to have other embodiments of the heat exchanger, in which there are two return lines and only one inlet pipe or respectively one inlet pipe and one return pipe. . This is in accordance with the requirements of the use of the heat exchanger, that is to say according to the fact that it is necessary

  to have separate circuits or a common circuit.

  In addition, it is conceivable to reverse the

  from the construction point of view of the connections for the supply and return lines. Fittings can

  also be carried out at the lower water box

  or the direction of passage of the heat exchange fluid through the heat exchanger may be

  reversed so that the through-pipe does not constitute

  kills more what is called an upstream pipe leading to the lower or upper water box, but a downstream pipe, to which is connected the return pipe.

16 2651308

Claims (12)

  1. Heat exchanger of a heating circuit   motor vehicle fencing, including a motor vehicle   air-conditioning and heating system for passenger cars, comprising at least one tubular block (1.2) arranged between two water boxes (3, 4), at least one return line that can be connected to the one (3) of the water boxes and at least one inlet pipe connectable to the other water box (3, 4) and having at least one through pipe (14) which is connected to one water boxes (3, 4) and is equipped, especially in the vicinity of the other water box (3, 4), with an inlet or return connection (12, 13) for the arrival line or return, characterized in that the through pipe (14) and the water boxes (3,4) are made of a plastics material, in particular a thermoplastic, and that the through pipe (14) can be connected to the bottom tubes in the water box (3,4) and in the tube bases (6,8) and in the lid (5,7) of the water box (3,4) by means of deformation   plastic, gluing or welding.   2. Heat exchanger according to claim   1, characterized in that the water boxes (3,4) are   the upper water box has at least one return connection (13, 13 '), to which the return line connections can be attached, and that a   through pipe (14) is connected in the central position   between the two parallel fin blocks (1, 2), as an upstream pipe, to the lower water box (4) and is provided at the upper water box (3) with a connection arrival (12) for the arrival line. Heat exchanger according to Claim 1 or 2, characterized in that two fin blocks (1, 2) arranged side-by-side are provided which can be 17 2651308   associated with separate heating circuits and whose common fins (10) are completely or partially separated by slots (28) parallel to the direction of passage of the air, that the upper water box (3) has two separate chambers (11,11 ') respectively   for a return pipe and for the lower water box   (4), and that the through pipe (14) extends to   through recesses (29) having a trans-   corresponding versale, fins (10) between the blocks of fins (1,2).   4. Heat exchanger according to any one   Claims 1 to 3, characterized in that in the   bottom tube holder (8) of the lower water box (4) there is provided a continuous opening (15), which is adapted to the cross section of the through pipe (14) and into which penetrates an end of this pipe   (14), which can be fixed in this opening preferably   by means of ultrasonic welding and welding by friction.   5. Heat exchanger according to any one   Claims 1 to 3, characterized in that the   through-conduit (14) can be fixed by one end   mente, frontally on the bottom tube holder (8) of the lower water box and encloses an opening (15 '), which is adapted to the inner cross section of   the through pipe (14) and passes through the bottom tubes (8).   6. Heat exchanger according to claim, characterized in that the tube base (8) of the   lower water box (4) has a tubing of   cord (16), which surrounds the opening (15 ') and on the-   which the through-pipe (14) can be fixed   particularly by friction or weld welding. ultrasound treatment.   7. Heat exchanger according to one of the 18 2651308   5 or 6, characterized in that the junction surfaces between the end of the through pipe (14) and the bottom tube holder (8) are made under the   form of a tongue and groove joint.   8. Heat exchanger according to any one   Claims 3 to 7, characterized in that the   through-pipe (14) extends between the fin blocks (1, 2), passes through a sealed passage (19) in the upper water box (3), and is bent in a re-entrant zone (27) of the box water (3) between the rooms (11,11 ').   9. Heat exchanger according to one of the   3 to 7, characterized in that the water box su-   upper (3) has a bend (20) between the chambers (11, 11 ') and which has an inlet connection (12) for the inlet pipe and an opening (21) which is located between the blocks of fins (1, 2) passes through the tube base (6) and serves to accommodate and fix the upper end of the through conduit (14) which extends in a rectilinear arrangement between the water boxes (2,3).   10. Heat exchanger according to claim 9, characterized in that the bend (20) is shaped so as to be integrated in the lid (5) of the upper water box (3) and forms, in a sealed manner, a channel   (22) with the opening (21) in the bottom tubes (6).   11. Heat exchanger according to any one   Claims 2 to 7, characterized in that it is   provided two separate through-ducts (14 ', 14 "), which are respectively connected laterally with respect to the fin blocks (1, 2), to the lower water box (4) and comprise, in the box area, upper water (3), inlet fittings (12 ') for two pipes separate arrival. 19 2651308   12. Heat exchanger according to the claim   11, characterized in that the cross-sectional shape   transverse pipes (14,14 ') is rectangular   at the level of the fin block and form res-   respectively lateral guide surfaces (23,23 ') for air flowing transversely through the blocks (1,2).