DE8335036U1 - DOUBLE TUBE HEAT EXCHANGER - Google Patents

Description

The invention relates to a double-tube heat exchanger, in particular for cooling gasoline, with an inner tube for a heat transfer or cooling medium and an outer tube enclosing the inner tube in the form of a jacket, which is a space formed between the inner and outer pipe, accessible via inflow and outflow connections limited to the passage of the substance to be heated or cooled to the outside.

Such heat exchangers are known for example from DE-OS 31 17 661 and are mainly used as gasoline coolers in motor vehicles that are in countries with sold in very hot climates. Such gasoline coolers are especially necessary for injection engines where the gasoline is pumped from the tank to the injection pump in an amount that exceeds the respective consumption, from where the excess gasoline is then returned to the tank. The constant circulation would Without cooling, petrol can become excessively warm after a short period of time.

Although in the known from DE-OS 31 17 661 gasoline cooler between the outer and inner pipe a separate Wall element is arranged, which divides the space between the pipes into a flow path and a return path divided, and although there is also a turbulence plate between the outer and inner pipe to swirl the too cooling gasoline is arranged, it is desirable to further improve the efficiency of the radiator.

It is therefore the object of the invention to provide a double tube heat exchanger to create, which even with small dimensions the exchange of large amounts of heat and thus when used as a cooler enables a high cooling effect.

-A-

This object is achieved in that the outer tube has a corresponding to the outer diameter of the inner tube Has inner diameter and the spacing space as a screw-like recess on the outside of the inner tube is arranged.

The helical recess leads the substance to be cooled - or heated - over a long way the inner tube through which the heat transfer or cooling medium flows, at the same time that which is essential for the heat transfer The outer surface of the inner tube is enlarged, and the outer tube also makes an effective contribution to the transfer of heat, since The outer and inner tubes are in direct contact between the recesses.

In a particularly preferred embodiment of the invention, there is also a inside the inner tube Helical body with mutually star-like, helically twisted webs and with the inner diameter of the inner tube arranged according to the outer diameter. Because of the immediate contact of the inner tube and the helical body, these two parts are in a good heat-conducting connection, so that a particularly good heat transfer between the inner tube and the same medium flowing through is given.

The helical body and / or the outer tube are preferably held by a press fit in or on the inner tube.

Apart from the fact that the inner and outer tube and the helical body are made of light metal, in particular aluminum can, is to be regarded as a particular advantage of the construction according to the invention that the strength of the under Exposed to high coolant pressures

Inner tube is increased by the helical body and the outer tube / by the outer tube of an expansion of the Inner tube counteracts and the helical body to an additional strong stiffening and thus high flexural strength leads.

Further advantageous embodiments of the invention are explained with reference to the drawing, in which a preferred Embodiment is shown. 10 shows

Fig. 1 is a partially sectioned side view

of the heat exchanger and
Fig. 2 shows the profile of the helical body.

The heat exchanger according to the invention consists essentially of an inner pipe 1 / an outer pipe 2 and a Helical body 3. While a heat transfer medium or cooling medium flows through the inner tube, it flows or flows the substance to be heated or cooled through a space between the inner and outer tubes 1 and 2.

To form this space, a thick-walled blank is preferably used for the inner tube 1, on whose Outer wall, preferably by machining, a helical recess 4 is arranged to the an annular recess 5 adjoins both ends, each of which is delimited by an annular web 6.

The outer tube 2 extends from ring web 6 to ring web 6, on which it is as well as on the helical one remaining between the helical recesses 4 Web is held by a press fit. For a secure seal, the front edges of the outer tube 2 with the respective Ring land 6 hard soldered at 7.

In the area of the annular recesses 5, an inlet and outlet connection 8 are arranged in each case for the outer pipe 2 and fixed by hard soldering. Since in the area of the annular recesses 5 no webs or the like. are present, the inflow or outflow nozzle 8 can can be arranged anywhere in the circumferential direction.

The ends of the inner tube 1 protruding beyond the annular webs 6 are also machined on the outside Machined tools in such a way that a further ring web 9 is formed, which is held by means of it Union nuts 10 with the interposition of a sealing ring 11 against the end piece of a connecting line is tensioned.

The helical body arranged inside the inner tube 1 consists of a profile part with a star-like relationship to one another arranged, in the center interconnected radial webs 13, which by twisting the profile part a take on helical shape. The helical body 3 is held in the inner tube 1 by a press fit, so that a good heat transfer between helical body 3 and inner tube 1 is guaranteed.

Even if it is advantageous with regard to a crystallographically undisturbed material structure of the inner tube If the same is to be produced by machining its outside, in principle there are also others Manufacturing process possible, for example, the inner tube can be formed with the webs 6 and 9 and the helical recess 4 are made as a cast part.

- 7 - f

In addition, the helical recess 4 |

in deviation from the graphic representation ν

be designed as a double screw, for example V

if the inflow and outflow nozzles 8 close to each other I

must be arranged. In this case the |

Inflow connection with one thread of the double screw K

in connection, while the drain connection with the
connected to another gear; Both courses of the double screw are then connected to one another at the end remote from the inlet or outlet connection 8.

With a view to high strength even at high internal pressure, it is advantageous if the internal diameter
of the inner tube 1 is the same everywhere. If applicable, however, there is also a training with constriction
or expansion, especially at the end areas,
possible.

In addition, a heat-insulating jacket (not shown) can be arranged on the outer tube 2.

Claims (6)

Expectations Double tube heat exchanger, especially for cooling gasoline, with an inner tube for a heat carrier or cooling medium and an outer tube which surrounds the inner tube like a jacket and which has an between Inner and outer tube formed, accessible via inflow and outflow connections for the passage the substance to be heated or cooled is limited to the outside, characterized in that that the outer tube (2) has an inner diameter corresponding to the outer diameter of the inner tube (1) and the spacing space is arranged as a screw-like recess (4) on the outside of the inner tube. ROTERMUND MANITZ FINSTRRWALD HEYN MORGAN Seelborysir23 / 25.7OOO Stutto.irt 50 PkVbVrt-koii'str. ! .firfdrf K'üiir / n'n i>, "Tolofon (0711) 5G 1? .r, \ T, 'ii! fpn (Cftw ? .Λ 42 Ii. lolcx OH Z9ÜTP. |> J \ TMF Deutsche Dunk AG 2) 3 915 (BLZ 600 700 70) L.-indos <jlrn [<; nen Stuttgart 3 090SIe (BLZ 600 50101) Cannütnttnr Volksbiilk 50-29 006 (BLZ 600 904 00) Postal check: Stuttciart Ί07 3Ί-706 (ÜLZ 600 100/0) 2. Double tube heat exchanger according to claim 1, characterized in that within the inner tube (1) a helical body (3) with radial webs which are arranged in a star-like manner and twisted in a helical manner (13) as well as with the inner diameter of the inner tube (1) corresponding to the outer diameter is arranged. 3. Double tube heat exchanger according to one of claims 1 0 or 2, characterized in that the Wer- ielkörper (3) and / or YES outer tube (2) by press fit in bzv /. are held on the inner tube (1). 4. Double tube heat exchanger according to one of claims 1 to 3, characterized in that the outer tube (2) is hard-soldered to the inner tube (1) at its front ends is. 5. Double tube heat exchanger according to one of claims 1 to 4, characterized in that the inner tube (1) for the formation of connection pieces with constant inner diameter at both ends over the outer tube (2) protrudes. 6. Double tube heat exchanger according to one of claims 1 to 5, characterized in that at both ends of the helical recess (4) an annular recess (5) adjoins, in the area of which the inflow or outflow (8) penetrates the outer pipe (2) is arranged.