DE3117661C2 - Heat exchanger - Google Patents

Abstract

In a heat exchanger, the rough structure of which is conventional, all of the sealing points to be obtained between the various parts are formed by O-rings. The entire heat exchanger is structurally held together by two flanges via which the two ends of the outer tube are connected to the two head pieces. The assembly of this heat exchanger is extremely simple and can be carried out by untrained persons. No soldering is required. This is particularly important when aluminum is used as the material for the heat exchanger. A particular area of application for this heat exchanger is its use as a gasoline cooler for injection engines.

Description

a) the head pieces (3, 4) have an outer diameter, which corresponds to the inner diameter of the outer tube (1);

b) the G-rings (19, 20) providing the seal to the outer tube (1) are located on the outer peripheral surfaces of the head pieces (3, 4);

c) the ends of the outer tube (1) are on a step (21, 22) on the outer surface of the two Head pieces (3, 4) crimped;

d) the axial position of the inner tube (2) is fixed by stops (2b. 24) on the head pieces (3, 4).

and / or the head pieces (3, 4) are made of aluminum.

10

20th

25th

30th

2. Heat exchanger according to claim 1, characterized in that the inner tube (2) tapers at one end from the main area (2a) over a transition area (2b) to a smaller diameter case (2c) and at least t with the transition area ( 2b) and the area (2c) of smaller diameter extends into the complementary through-hole (17) of the corresponding head piece (3).

3. Heat exchanger according to claim 1 or 2, characterized in that at least one end of the Inner tube (2) is seated in a press fit in the through hole (17) of the corresponding head piece (3).

4. Heat exchanger according to one of the preceding claims, characterized in that at least one end of the inner tube (2) is untapered.

5. Heat exchanger according to claim 4, characterized in that the untapered end of the inner tube (2) at a step (24) of the through hole (18) of the corresponding head piece (4) is present.

6. Heat exchanger according to one of claims 1 to 5, wherein the annular space between the tubes is divided into a forward path and a return path by a partition, characterized in that that the partition (6) consists of a material which is below that of the two tubes (1, 2) exerted, elastic force leads to the seal.

: 7. Heat exchanger according to claim 6, characterized in that that the outer tube (1) to increase the contact pressure in the area of the partition (6) radially printed inside, e.g. B. is rolled.

8. Heat exchanger according to one of claims 1 to 7, characterized in that the tubes (1, 2) The invention relates to a heat exchanger according to the preamble of the main claim.

In older heat exchangers, such as those in DE-GM 77 36 685, in DE-GM 17 92 629 or in the DE-AS 12 08 314 are described, the various parts to be connected tightly to one another are soldered. The soldering takes on the task of sealing and mechanical connection at the same time. However, this production method has the disadvantage that trained personnel is required for them and hatred nevertheless the risk of errors, e.g. B. Leaks, can never be turned off completely. the Difficulties associated with the soldering process are further increased when used as the material for the pipes and / or the head pieces of the aluminum heat exchanger are used like this! L

For this reason, a heat exchanger was already in the unpublished DE-OS 31 33 756 Proposed type designated in the preamble of the main claim. This is where the mechanical connections are made caused by plugging or by flanging, while the task s of sealing O-ring seals are transferred. In this way, assembly can also be carried out by untrained personnel in a short time, without the risk of leaks. In this heat exchanger, the inner tube is complete passed through the head piece and crimped on the face of the head piece. The headpiece is also pushed over the outer circumference of the outer tube. With this type of construction it is very difficult, if not impossible, an axial connection nipple for the axially flowing liquid to be provided, since then the flanging is no longer or only very difficult to access

The object of the present invention is to design a heat exchanger of the type mentioned at the outset in such a way that that the cohesion giving flare on the head piece is easily accessible, even if a axially protruding connection nipple is provided on the head piece.

This object is achieved by the invention described in the characterizing part of the main claim. According to the invention So the functions of sealing and mechanical connection are as in the above-mentioned DE-OS 31 33 756 decoupled from each other: The fluid seal, which one Outflow of fluid from the heat exchanger or an outflow of fluid from the Annular space between the two tubes in the interior of the inner tube or vice versa is prevented taken over by O-ring seals. Leaks can hardly occur here. The whole The arrangement is held together mechanically by two easily accessible flanges with which the ends of the outer tube are folded over on the head pieces via corresponding steps. When creating this Flanging does not need special attention to be applied as it is only mechanical Stability and not perfection is what counts. This work can also be automated if necessary.

Advantageous further developments of the invention are given in the subclaims.

3

An exemplary embodiment of the invention is shown below in the annular space 5 on the right-hand side opposite the inside explained in more detail with reference to the drawing; the only space 14 of the inner tube 2 seals. Figure shows a heat exchanger according to the invention. The assembly of the heat exchanger described

In the axial section, for example, can be done as follows:

The basic structure of the heat exchanger as such is 5 First of all, the areas 2b and Ib are known: de, the end of the inner tube on the left in the drawing

Two tubes 1, 2 arranged coaxially to one another are inserted into the corresponding one with the O-ring seals the head piece 3 provided at their opposite ends by two 19 and 23 is inserted. Inside head pieces 3, 4 held. The helical installation 16 can already pass between the two pipes 2 1, 2 lying annular space 5 can be found by a separating io, which is located on the right in the drawing, wall 6, e.g. B. is introduced in the form of a hairpin-shaped curved, untapered end of the inner tube 2, th wire, into a forward path and a return path. Next, the outer path is via the head piece 3 divided. The advance path communicates with one tube 2 pushed. In the lines still accessible from the right Eialaßnippel chen annular space 5 arranged radially on the outer tube 1, the partition 6 and the door 7; the return path is with an axially offset, 15 bulb sheet 9 inserted. Now that will be in the drawing outlet nipple 8 also attached to the outer pipe 1, right head piece 4 between the outer and inner pipe in connection. or 2 pushed in until the right end of the inner pipe

In the annular space 5 there is also a known 2 abuts the step 24 ter way structured, curved turbulence plate 9, outer tube 1 on both sides over the mares 2), 22 of the head soft between the head pieces 3.4 is axially fixed 20 pieces 3.4 flanged

The head pieces 3, 4 are integrally connected to the inner part. The partition 6 can be made of one material

space 14 of the inner tube 2 leading connection piece, which is between the AU3en- and inner tube 10, 11 integrally formed soft union nuts 12, 13 slightly deformed to 1, 2 and thus the flow path in the ring connection a pipe system (not shown) tightly separates space 5 from the return path gen. The head pieces 3, 4 and the connecting pieces 10, 25 can alternatively also the outer tube 1 in the area in 11 are rolled from an axial, stepped passage which the partition 6 rests and so on the Bore 17 or 18 penetrated The further area 17a, partition 6 are pressed on.

18a of these through bores 17, 18 has a

Diameter corresponding to the outside diameter of the in- To do this, 1 sheet of drawings

nenrohres corresponds to; the narrower range 176.18 pounds> the 30th

Through bores 17, 18 has a diameter which is approximately the inner diameter of the connecting piece 10.11 corresponds to the pipes to be connected.

In the interior space 14 of the inner tube 2 is a known helical installation held together by a rod 15 16 inserted.

The special features of the heat exchanger shown and described lie in the manner in which the various components are assembled, as well as in the geometrical design required for this.

The head pieces 3, 4 have an outer diameter which is the inner diameter of the outer tube 1 corresponds to an O-ring seal 19, 20, which is located in the outer surfaces of the head pieces 3, 4 Leakage of fluid from the annular space 5 to the outside prevents Die Ender; of the outer tube 1 are crimped over steps 21, 22 on the outer surface of the head pieces 3, 4. Hold these flanges all parts of the heat exchanger axially together.

The inner tube tapers at the end on the left in the drawing in a transition region 2b from its maximum; Diameter in area 2a to a smaller diameter in area 2c. The through hole 17 in the left head piece 3 is shaped in a complementary manner, so that the left end of the inner tube 2 - possibly with a press fit - can be inserted into the hole 17 and rests snugly there

In the area 17a of the through hole 17, an O-ring seal 23 is inserted, which the annular space 5 seals against the interior space 14 of the inner tube 2 on one side.

At the end shown in the right-hand side of the drawing, the inner tube 2 runs at maximum Diameter, i.e. not tapered. This end lies on a radial step 24 of the through hole 18 in the Head piece 4. In the area 18a of the through hole 18 there is again an O-ring seal 25 which

Claims (1)

Claim e: 1. Heat exchanger, in particular gasoline cooler, with an inner tube and one concentric to it arranged outer tube; with two head pieces, which are sealed against the pipes by means of O-rings are, the axial position of at least one pipe by a suitable stop on the head pieces is fixed and one of the tubes is flanged over a step on the outer surface of the two head pieces is; with an axial through-hole in each head piece, which at least in one area has a Has a diameter that corresponds to the outer diameter of the inner tube, marked through the following features: