DE2728827A1 - HEAT EXCHANGERS, IN PARTICULAR FOR VEHICLES - Google Patents

Description

Patent application for heat exchangers, especially for motor vehicles

The invention relates to heat exchangers, in particular with a divided into a flow and return space, a lumpy connection water tank and a one-piece deflection water tank made of plastic, which are connected to one another via a bundle of metal water pipes held together by air guide lamellas, and the Pipe ends introduced into the pipe openings widening, groove-shaped indentations on the outside of the bottoms of the water tanks, hardening plastic material are attached in a sealed manner.

Heat exchangers of the type mentioned are already from the DT-OS 23 02 769 and DT-OS 23 02 770 known.

According to one embodiment of such a heat exchanger are one-piece connection and deflection water boxes made of plastic used, however, around the pipe ends via one in the pipe openings widening groove-shaped depressions on the outside of the floors the water tanks introduced, hardening plastic material to be sealed with these recesses correspondingly supplementary Ground covers must be provided. These bottom covers must

809801/0425

Headquarters of the company in Cologne, Cologne Register Court, HRB 84 Chairman of the Supervisory Board: Hans Schaberger Management Board Peter Weiher Chairman

Horst Bergemann Franz J. Bohr · Waldemar Ebers Wilhelm Inden Alfred Langer Representative: Hermann Dederichs · Hans Wilhelm Gab · Paul A. Guckel ■ Hans-Joachim Lehmann

Ford / D-208/17. May 1V77

relative to the water tanks are fixed in a suitable manner so that after inserting the pipe ends of the pipe bundle into the pipe openings and then injecting hardening plastic material an uncontrolled leakage of the plastic material is avoided in the closed groove-shaped depressions.

This embodiment of a known heat exchanger thus has the disadvantage that an additional one for the necessary bottom cover Tool, material and assembly effort is required.

According to an alternatively proposed embodiment of a Such a heat exchanger water tanks are used, which along a vertical, wave-shaped containing the tube openings Cut surface are divided. The cut surface is at the same level as the pipe openings again provided with groove-shaped depressions, which after the two water box parts have been joined together, the pipe openings again Form widening groove-shaped depressions into which a hardening plastic material is injected after the pipe ends have been inserted into the pipe openings will.

This embodiment of a known heat exchanger avoids an increased cost of materials, but makes an increased tooling required for the divided water tanks. Furthermore must be the cut surface running over the entire circumference of the water tanks be sealed over the hardening plastic material, from what there is, on the one hand, a high cost of hardening plastic material and, on the other hand, the great length of this seal Add the likelihood of possible leaks greatly is increased.

In addition, it should be noted that it is in heat exchangers known conventional design, in which the pipe ends of a

809881/0425

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Ford / D-208 / May 17, 1977

Tube bundle of water pipes in a tube sheet via corresponding Sealing means are attached in a sealed manner, this is already known To apply sealant in the form of a hardening plastic material. Such an embodiment of a known heat exchanger can be found in DT-OS 25 09 717, the adhesives or curable plastic materials shown here in a very complex manner must be applied to the tube sheet via a forming device.

The object of the invention is to provide a heat exchanger of the initially To improve said type in such a way that simple tools and little for the production of the one-piece water tanks made of plastic Material are required, the curable plastic material can be introduced in a simple manner and the length of the sealing joints the absolutely necessary minimum remains limited.

According to the invention, this object is achieved by a heat exchanger of the type mentioned has the features indicated in the claims.

The fact that the outside of the bottoms of the water tanks with a A plurality of pipe sockets are provided, which are surrounded by spaced ring webs and wherein in between the pipe sockets and the ring webs formed, axially open ring grooves, the curable plastic material can be introduced and the pipe ends on the pipe, clip-on and with their flared collar in the plastic material can be lowered, the production of one-piece plastic water tanks with simple tools and little material is made possible, the introduction of the curable plastic material is simplified and the length of the sealing joint is reduced to what is absolutely necessary Minimum restricted.

The fact that the inner diameter of the pipe ends is slightly larger than the

809881/0425

Ford / D-208 / May 17, 1977

Outside diameter of the pipe socket and the outside diameter of the issued collar is slightly smaller than the inner diameter of the ring webs, it is ensured that this is done before the Curable plastic already located in the ring grooves at the pipe ends Material not only wets the pipe ends on the outside but also rises a little between the pipe socket and the inner wall of the pipe ends and thus the pipe ends are anchored both on the inside opposite the pipe socket and on the outside opposite the ring webs. In this way an absolutely tight and tensile fastening of the pipe bundle made of water pipes to the water tanks made of plastic is achieved.

As a curable plastic material here has a Prodict Teroson under the name Terokal 3919 proved to be favorable.

It has good flow and distribution properties and is subject to heating curable to a moderate temperature of about 140 to 200 C within a short period of time of about two minutes.

The structure of a heat exchanger proposed according to the invention can of course be used accordingly for all possible known designs of heat exchangers. However, it is on it pointed out that in a certain known design of a heat exchanger by the structure according to the invention a minimum of tool, Material and assembly costs are required. This is the case when the heat exchanger, as is known per se, with a single, in a and a one-piece connection water tank divided into a rear room made of plastic and a pipe bundle of metal water pipes held together by air guide lamellas, the water pipes are formed in a manner known per se starting from the flow chamber and returning to the return chamber in a U-shape. The at this design of a heat exchanger are known advantages the structure according to the invention is further supplemented by the fact that the process required for the production of such a heat exchanger

808881/0425

Ford / D- ^ 08/17 May 1977

steps are significantly simplified.

The invention is illustrated with reference to two in the accompanying drawings Embodiments of heat exchangers explained in more detail.

It shows:

Fig. 1 is a side view of a very compact heat exchanger according to the invention;

FIG. 2 is a view in the direction of arrow II in FIG. 1; 3 shows a section along the line III-III in FIG. 1; Fig. 4 is a view in the direction of arrow IV in Fig. 3; Fig. 5 is a section along the line V-V in Fig. 1; 6 shows a view in the direction of arrow VI in FIG. 5;

7 shows a side view of a very simply constructed heat exchanger according to the invention;

Fig. 8 is a view in the direction of arrow VIII in Fig. 7; 9 shows a section along the line IX-IX in FIGS. 7 and FIG. 10 is a view in the direction of arrow X in FIG. 9.

The embodiment shown in Figures 1 to 6 of a very compact building heat exchanger consists essentially of a one-piece connection water tank 1 made of plastic with a lower

809881/0425

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Ford / D-208 / IV. May 1977

division into a flow and a return area and shaped accordingly Inlet and outlet trim and a deflecting water box 2, which are held together by air guide blades 3 made of aluminum with each other Tube bundle of water pipes 4 made of metal and a curable plastic material 5 which embeds the pipe ends is sealed are connected. One that encompasses the heat exchanger on its circumference Foam seal 6 is used, for example, to arrange the heat exchanger in a heating housing of a motor vehicle.

The water tanks 1 and 2 made in one piece from plastic are on the outside of their flat bottoms 8 and 9 with one of the number of Water pipes 4 are provided with a corresponding number of towering pipe sockets 10, which are comprised of annular webs 11 running at a distance from them will. In the axially open annular grooves 12 formed in this way between the pipe socket 10 and the annular webs 11, which are preferably are designed to overlap or run into one another, that is curable plastic material 5, e.g. B. Terokal 3919 from Teroson, can be introduced via a corresponding distribution device.

In this embodiment, the metal water pipes 4 are flat pipes formed, on which a plurality of air guide lamellae 3 made of aluminum are plugged and subsequently by expanding the tubes under internal pressure be determined.

Simultaneously with the expansion of the flat water pipes 4 under internal pressure the pipes are widened at their pipe ends 13 via corresponding mandrels and provided with a flared collar 14. The widened Pipe ends 13 and the flared collars 14 are shown in FIGS. 1 and 2 in the details highlighted in circles A and B. In FIG.

The inside diameter of the expanded pipe ends 13 becomes somewhat here executed larger than the outer diameter of the pipe socket 10

809881/0425

Ford / ΰ-208 / May 17, 1977

and the outside diameter of the flared collar 14 is made somewhat smaller than the inside diameter of the annular webs 11.

This ensures that that which is introduced into the annular grooves 12 curable plastic material 5 when the pipe ends 13 are slipped onto the pipe socket 10 both on the inside and on the outside the pipe ends 13 rises and can thus ensure that the water pipes 4 are firmly anchored in the water tanks 1 and 2.

The manufacture of the heat exchanger described here includes the the following process steps, some of which are known per se:

a) Manufacture of the two one-piece water tanks 1 and 2 made of plastic using an injection or blow molding process;

b) Manufacture of the tube bundle by cutting the water pipes 4 to length, placing the air guide lamellas 3 and expanding the water pipes 4 under internal pressure with simultaneous expansion of the pipe ends and production of the issued collar 14 via corresponding Thorns.

c) Introducing the curable plastic material 5 into the axially open annular grooves 12 of the with the bottoms 8 and 9 at the top Water boxes 1 and 2;

d) Arrange the tube bundle between the two water tanks 1 and 2, tilt the two water tanks 1 and 2 by 90 and put them on on the tube bundle in such a way that the expanded tube ends 13 are attached to the pipe socket 10 and the issued Collars 14 are sunk into the plastic material 5;

809881/0425

Ford / D-208 / May 17, 1977

c) Establishing this arrangement using appropriate devices and Heat the prebond areas to a temperature of about 140 to 200 C over a period of approx. 2 minutes.

To explain these procedural steps, it is pointed out that that with the necessary tilting of the water tanks 1 and 2 by 90 no leakage of the flowable plastic material 5 is to be feared, since according to the invention the position of the adjoining air guide lamellae 3 is chosen so that these with the water tanks after joining together the tube bundle this practically complete the axially open annular grooves 12. For the short time until the subsequent hardening of the Plastic material, this sealing effect is sufficient.

The embodiment shown in Figures 7 to 10 is a very simple one building heat exchanger consists essentially of the same components like the heat exchanger according to FIGS. 1 to 6, so that the same reference numerals with only an index are used for the same or similar components be used.

The embodiment of a heat exchanger shown in FIGS. 7 to 10 has in a known manner a single, integrally made of plastic connection water tank Γ with a through Air guide lamellae 3 'made of aluminum and held together by a bundle of water pipes 4' made of metal over a hardenable tube which embeds the pipe ends Plastic material 5 'is connected in a sealed manner. The water pipes 4 * are here in a known manner from the flow space starting out and returning to the return space running in a U-shape. The water pipes 4 'are here at their U-bends an end plate 7 is set. A foam seal encompassing the heat exchanger 6 is again used to arrange the heat exchanger, for example in a heating housing of a motor vehicle.

809881/0425

Ford / D-208/1 ?. May 1 «* 77

The only one-piece water tank 1 'made of plastic is similar to that described in connection with Figures 1 to 6, on the outside of its flat bottom 8 'with one of the Number of pipe ends corresponding number of protruding pipe sockets 10 'provided by the spaced apart annular webs 11 'are included. In the axially open annular grooves formed in this way 12 ', which are preferably designed to merge into one another the hardening plastic material 5, e.g. B. Terokal 3919 from Teroson can be introduced via a corresponding distribution device.

The water pipes 4 'made of metal are in this embodiment of the Heat exchanger designed as normal round tubes, in which to increase the flow turbulence, helical turbulence is stripes 15 can be inserted. The plurality of air guide lamellae 3 'made of aluminum are again in a known manner on the water pipes 4 'and fixed by expanding the tubes under internal pressure.

Simultaneously with the expansion of the water pipes 4 'under internal pressure the ends of the water pipes 4 'are provided with flared collars 14' via corresponding mandrels. The formation of the ends of the Water pipes 4 'can be seen from the details shown in FIGS. 7 and 8 in circles A *.

The inner diameter of the water pipes 4 'is chosen so that it is slightly larger than the outer diameter of the pipe socket 10 'and the outer diameter of the issued collar 14' is chosen so that it is slightly smaller than the inner diameter of the annular webs 11 '.

This again ensures that the water pipes 4 'both inside and outside are wetted with the curable plastic material 5 'and for a tight and firm anchoring on the water

809881/0425

Ford / D-208 / May 17, 1977

MT

box 1 'worries.

The manufacture of this embodiment of a heat exchanger includes the following process steps, some of which are known per se:

a) Manufacture of the single water tank 1 'in one piece from plastic by injection or blow molding;

b) Manufacture of the tube bundle by cutting and bending the water pipes 4 ', placing the air guide lamellae 3' and expanding the pipes by internal pressure while simultaneously producing the exhibited Collar 14 'over corresponding mandrels;

c) Introducing the curable plastic material 5 'into the axially open annular grooves 12' of the bottom-up
Water box 1 ';

d) placing the tube bundle from above in such a way that the tube ends placed on the pipe socket 10 and the exposed collars 14 'are sunk into the plastic material 5';

e) heating the joint areas to a temperature of about 140 to 200 C over a period of about two minutes.

Because the pipe ends to be sealed are on one side, the material and manufacturing costs are reduced to a minimum.

809881/0425

Claims (6)

Ford / D-208 / May 17, 1977 claims 2728827 1. Heat exchangers, especially for motor vehicles, with a one-piece connection water tank divided into a flow and return space and a one-piece deflection water tank made of plastic, which are connected to one another via a bundle of metal water pipes held together by air guide lamellas and the pipe ends being inserted into the pipe openings widening, groove-shaped depressions on the outside of the bottoms of the water boxes, hardenable plastic material introduced in a sealed manner, characterized in that the outside of the bottoms (8 and 9) of the water boxes (1 and Z) are provided with a multiplicity of pipe sockets (10), which are encompassed by spaced annular webs (H) and wherein the hardenable plastic material (5) can be introduced into the axially open annular grooves (12) formed between the pipe socket (10) and the annular webs (H) and the pipe ends (13) the pipe socket (10) can be plugged on and with its flared collar (14 ) can be lowered into the plastic material (5). 2. Heat exchanger according to claim 1, characterized in that the inner diameter of the pipe ends (13) is somewhat larger than the outer diameter of the pipe socket (10) and the outer diameter of the issued collar (14) slightly smaller than that The inner diameter of the ring webs (H) is. 3. Heat exchanger according to claims 1 and 2, marked thereby e i c hn e t that the curable plastic material (5) is one below Warming to a moderate temperature of around 140 to 200 C. is hardening material within a short period of time of about two minutes. 809881/0425 ORIGINAL INSPECTED Ford / D-208 / May 17, 1977 4. Heat exchangers, especially for motor vehicles, with a single, one-piece, subdivided into a forward and a return chamber Connection water tank made of plastic, which is connected to a bundle of water pipes held together by air guide blades made of metal via a curable plastic material that embeds the pipe ends is connected in a sealed manner, in particular according to the characteristics of claims 1 to 3, characterized in that that the water pipes (4 *) in a known manner from Starting flow chamber and returning to the return chamber are U-shaped. 5. A method for producing a heat exchanger according to the claims 1 to 3, characterized by the combination of the following Process steps, some of which are known per se: a) Manufacture of the two one-piece water tanks (1 and 2) from plastic in the injection or blow molding process; b) Manufacture of the tube bundle by cutting the water pipes (4), placing the air guide lamellas (3) and expanding the Pipes by internal pressure with simultaneous expansion of the pipe ends (13) and production of the flared collars (14) via corresponding mandrels; c) introducing the curable plastic material (5) into the axially open annular grooves (12) of the water tanks (I and 2) lying with the bottoms (8 and 9) upwards; d) Arranging the tube bundle between the two water boxes (1 and 2), tilting the two water boxes (1 and 2) by 90 and pushing the water boxes onto the tube bundle in such a way that the tube ends (13) on the pipe socket (10) 809881/0425 Ford / D-208 / May 17, 1977 attached and the issued collar (14) in the plastic material (5) be sunk; e) Fixing this arrangement and heating the connection areas to a temperature of about 140 to 200 C above a period of about two minutes. 6. A method for producing a heat exchanger according to claim 4, characterized by the combination of the following process steps, some of which are known per se: a) Production of the single, one-piece water tank (1 *) Made of plastic by injection or blow molding; b) Production of the tube bundle by cutting and bending the water pipes (4 '), placing the air guide lamellas (3') and Expansion of the tubes by internal pressure while at the same time producing the issued collar (14 ') via corresponding Thorns; c) Introducing the hardenable plastic material (5 ') into the axially open annular grooves (12') of the bottom (8 ') overhead water tank (Γ); d) Place the tube bundle on the water tank (Γ) in the Way that the pipe ends are plugged onto the pipe socket (10 ') and the flared collar (14') in the plastic material (5 *) are sunk; e) Heating the connection areas to a temperature of about 140 to 200 C over a period of about two minutes. 0O9881 / OA2S