WO2011147554A2

WO2011147554A2 - Method for producing a heat exchanger and heat exchanger

Info

Publication number: WO2011147554A2
Application number: PCT/EP2011/002528
Authority: WO
Inventors: Werner Janzer; Andreas Bonk; Uwe Wild
Original assignee: Boa Balg- Und Kompensatoren-Technologie Gmbh
Priority date: 2010-05-22
Filing date: 2011-05-20
Publication date: 2011-12-01
Also published as: KR20130079325A; DE102010021334A1; WO2011147554A3; US20130000878A1; CN102822615A; DE102010021334B4

Abstract

The invention relates to a method for producing a heat exchanger. According to said method, at least one plate for dissipating heat is inserted between two neighbouring corrugations of the corrugated body and the corrugations are pressed together in such a way that the inserted plate is braced in a positive and non-positive fit between the corrugations. The invention also relates to a heat exchanger of this type for cooling fluids, said exchanger comprising a tube that is partially designed as a corrugated tube and has at least one plate for dissipating heat that is braced between two corrugations of the corrugated body.

Description

Process for the preparation of a heat exchanger and

heat exchangers

The invention relates to a method for producing a heat exchanger for cooling fluids with a tube which is partially formed as a corrugated body and a heat exchanger for cooling fluids with a tube which is partially formed as a corrugated body.

Such heat exchangers are used to a

Heat exchange between fluids - gases or liquids - make. A first fluid to be cooled or heated flows through a tube. This is guided in a further container surrounding the tube, which contains a second fluid, wherein the second fluid surrounds the tube with the first fluid and both fluids have a temperature difference to each other. Such heat exchangers are used, for example, in systems for

Exhaust gas recirculation in motor vehicles, for heating the supply air to the passenger compartment of a vehicle by engine waste heat or the like use, in which the exhaust air, such as the exhaust gas of an internal combustion engine, using a

Heat exchanger is cooled. Such a system

describes the EP 1 136 780 A2, wherein a first tube, which transports a first liquid, is surrounded by a second tube, which leads a second liquid with a different temperature in the resulting gap. The heat exchanger has two connecting pieces which are designed to be movable by means of corrugated bodies and a straight central part. Furthermore, at the first, inner tube in the middle part around the outer

CONFIRMATION COPY Circumference in the axial direction ribs formed which are formed distributed around the circumference. The ribs are hereby made slightly shorter than the length of the middle part. Due to the elongated contact surface of the ribs with the smooth tube creates a strong over the length of the tube

Tension, what the different

Temperature gradients along the pipe through the

contribute significantly to different temperatures of the fluids.

In this context, are also heat exchangers with

Cross ribs are known, which are fixed in a ring around the tube, usually by welding. These have a small one

Heat exchange surface, i. Connecting surface between pipe and rib, whereby a plurality of these ribs can be mounted on the pipe. This is precisely where large temperature gradients occur - as e.g. in one

Exhaust pipe to be observed - forced voltages in

Circumferential direction in the pipe wall, which can adversely affect the weld under heavy stress and cause a costly repair.

Also, heat exchangers are known, which instead of a

Smooth tube with ribs one or more corrugated body as an inner, first fluid leading element show. The

Use of a corrugated body increases the operation of a heat exchanger according to the prior art, since the waves slow down the flow rate of the gas within the tube. The waves create side spaces to the main flow direction of the gas, creating turbulences that slow the whole

Velocity profiles of the gas within the tube. Due to the longer residence time of the inner Fluids is given a constant heat exchange with the second fluid outside the corrugated body. However, the previous designs show a structurally complicated construction, which achieves a high weight.

It is an object of the invention to provide a heat exchanger of the type mentioned, which is structurally simple and inexpensive to manufacture. Another object is to propose a method of manufacturing a tube for such a heat exchanger.

According to the invention, the object is achieved by a

Released method of the type mentioned above, which is characterized in that at least one plate for heat dissipation between two waves of the shaft body

is inserted, and the waves are pressed against each other in such a way that the inserted plate is clamped between the waves. Furthermore, the invention provides a heat exchanger of the type mentioned, in which at least one plate for heat dissipation between two shafts of the corrugated body is inserted and clamped positively and non-positively.

The heat exchanger according to the invention comprises a tube which is partially prefabricated as a corrugated body. An increased heat output can be through the

achieve heat exchanger according to the invention by additionally clamped a metal plate between two successive waves of the corrugated body. Through the use of the plate, the heat transfer of the inner to the outer fluid by a surface enlargement of the

Heat exchange surface improved. For a further increase of the heat exchange surface is preferably provided that this is variable between waves and plate by different wave heights. A higher wave height has the consequence that the plate experiences a better hold after the compression and a larger surface between shaft and plate favors a changed, improved heat dissipation. The use of several plates, the heat output can be controlled selectively, with particular preference

provided is that two plates of radial

opposite sides of the tube between two waves can be used. This ensures uniform heat dissipation over the entire circumference. For this purpose, the invention preferably provides that the at least one plate has a rectangular shape and that the plate on a pipe edge facing a semicircular recess fits the diameter of the corrugated body in the trough, wherein the plate and / or the tube are made of stainless steel , Preference is given to plates whose thickness does not exceed the width of the wave trough lying between the corrugations of the corrugated body. The better the plate between the waves can be inserted and the edge nestles against the pipe, the better is also the

Compression.

The production of the heat exchanger is particularly simple. A suitable plate, wherein the plates are provided in advance with a semicircular recess matching the diameter of the tube in the trough, is inserted between two adjacent corrugations of the corrugated body. Thereafter, these waves are pressed together with the intermediate plate in such a way that the inserted plate is positively and non-positively clamped between the waves. For a particularly strong press connection, the invention provides that the waves by axial compression by means of a Tool radially evenly pressed to the plate. Thus, no weld is needed to the

Fix plate to the pipe. It is further preferred that before clamping the plates from radially opposite sides of the tube between two

adjacent waves are used, creating a

Improvement over welded variations with

annular ribs formed by no annular

Use, but a multipart, simple

is to be deployed. Due to the multi-part inserts of the plates forcing stresses in the circumferential direction are avoided by thermal expansion. The heat exchanger is thus exposed to less mechanical stresses caused by temperature gradients, as is the case with conventional welded heat exchangers. A particular advantage is the use of air as a heat exchange medium. Thus, no further arrangement for a second fluid is necessary, which serves as a replacement gas or - liquid. The construction as a whole is smaller and more compact. Also are more different

Material combinations between pipe and plate conceivable, so that the heat output can be further optimized.

Further advantages and features of the invention will become apparent from the claims and from the following description in which an embodiment of the invention below

Reference is made to the drawings in detail. 1 shows a schematic overview of the total

heat exchanger according to the invention; Fig. 2. a side view of the heat exchanger according to the invention in cross section;

Fig. 3. a plate for heat dissipation in a

Front view;

Fig. 4.1 shows a first step of the invention

Production process in perspective

Presentation;

Fig. 4.2 shows a second step of the invention

Manufacturing process in cross section; and

Fig. 4.3 shows a third step of the invention

Production process in cross section.

Fig. 1 and Fig. 2 show an overview of a

Heat exchanger 1 according to the invention in an overall and a lateral view. The heat exchanger 1 comprises a tube 2 with a corrugated body 3. The tube 2 and corrugated body 3 are preferably made of stainless steel and are made of one piece. The corrugated body 3 has waves 4, with a trough 4.1 and a wave peak 4.2. Pressed between two shafts 4, a plate 5 is arranged. In the embodiment of FIG. 1 shown here

exemplified a single plate 5 clamped between waves 4 shown. There are also several plates can be inserted, the plates are not only from one side, but also from two sides which are opposite to the tube, inserted and thus have radially in different directions. This is depending on space or

Heat dissipation requirement flexibly usable. In Fig. 3, such a plate 5 is shown. The plate 5 in this case shows a rectangular basic shape, wherein at its, later the corrugated body 3 facing edge 5.1, a semicircular recess 5.2 is provided. The

Recess 5.2 shows a diameter D1, which corresponds to a diameter D2, which is given by the centers of the radii of the wave trough 4.1 of the corrugated body 3 (see Fig. 2). The plate 5 may in this case be formed in other forms, so is next to one

Rectangular shape in different lengths and heights also a shape as a semicircle or triangle possible. To ensure a perfect fit, the plate should have a maximum thickness equal to the width of the plate

Wellentals 4.1 or a distance between two shafts 4 before the bracing corresponds. So is a positive and non-positive connection after tightening

guaranteed. Preferably, the plate 5 is made of stainless steel, and to optimize the heat dissipation also other materials, such. Copper, are possible.

The illustrations of FIGS. 4.1 to 4.3 show stepwise the method for producing such a heat exchanger 1 in cross section. By way of example it is shown how two plates 5 are brought from above and below the tube 2 to the corrugated body 3. The plates 5 are perpendicular to

Course of the pipe 2 between two shafts 4 in a trough 4.1 used (see also Fig. 4.2) and possibly held in this position. This helps

Semicircular recess 5.2 of the plate 5 to find a central position at the bottom of the wave 4.1. If the plate 5 is inserted perpendicular to the tube 2, on both sides of the plate 5 surrounding waves 4, a shaft left 6.1 and a shaft right 6.2 of the plate 5, a tool (not shown) attached. This tool then presses the waves concerned uniformly in the opposite axial direction against each other, so that the shaft left 6.1 of the plate 5 and the shaft right 6.2 of the plate 5 are pressed to each other. The shafts 4 are in this case completely compressed, so that the plate 5 is clamped positively and non-positively. Thereafter, the tool is released again from the shafts 4, and moved to another plug-in plate 5, if several

Plates are to be attached to the corrugated body 3. If two plates 5 are to be inserted between the same shafts 4, it is provided to bring the plates 5 opposite to each other to the tube 2, to hold and to press together.

With the heat exchanger 1 according to the invention is an easy to manufacture and inexpensive heat exchanger

emerged, which can be further optimized by the use of additional plates or different material pairings. Another optimization of the heat output is through

Variation of the heat exchange surface caused by the

Wave height and the pressed surface of the plate is given to reach. Furthermore, by the

Pressing the plate Forced stresses in the circumferential direction, as they are common in welded heat exchangers, completely avoided. This is achieved by inserting the panels one at a time and not attaching them to the pipe in a ring shape. The particular advantage over a weld is the increased mechanical flexibility of the pressing. The materials have each other, in the

Compared to a welded solution, just that much

Game to stress, triggered by the different thermal expansion of the materials, inter alia, due to the Temperature, balance. The cost-effective aspect is particularly evident in that preformed shaft body of any type and size can be used. Depending on the requirements of the heat exchanger, the insertion and compression of suitable plates can be varied and integrated into the existing production process without great effort. The non-compressed waves provide the further advantage of the heat exchanger that this

Heat exchangers provide a mobility and compensation that is not given by rigid tubes.

LIST OF REFERENCE NUMBERS

1 heat exchanger

2 pipe

3 corrugated body

4 waves

4.1 wave valley

4.2 Wave Mountain

5 plate

5.1 edge

5.2 recess

6.1 left shaft

6.2 right wave

Diameter diameter recess

D2 Diameter of the radii centers in the trough

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Claims

claims

1. A method for producing a heat exchanger for

Cooling of fluids with a tube, which is partially formed as a corrugated body, characterized in that at least one plate is inserted for dissipating heat between two waves of the shaft body, and the waves are pressed against each other in such a way that the inserted plate is clamped between the waves.

2. The method according to claim 1, characterized in that the waves by axial compression by means of a

Tool radially evenly pressed against the plate.

3. The method according to claim 1 or 2, characterized

characterized in that before clamping two plates are inserted from radially opposite sides of the tube between two adjacent shafts.

4. The method according to any one of claims 1 to 3, characterized

in that the plates are provided in advance with a semicircular recess matching the diameter of the radii centers of the tube in the trough. Heat exchanger for cooling exhaust gases with a tube (2), which is partially formed as a corrugated body (3), characterized in that at least one

Plate (5) for heat dissipation between two shafts (4) of the corrugated body (3) inserted and between the two

Shafts (4) is clamped.

Heat exchanger according to claim 5, characterized in that the at least one plate (5) has a rectangular or semicircular shape.

Heat exchanger according to claim 5 or 6, characterized

characterized in that the plate (5) on a tube (2) facing edge (5.1) has a semi-circular U-shaped recess (5.2) matching the diameter (Dl) of the corrugated body (3) in the trough (4.1).

Heat exchanger according to one of claims 5 to 7, characterized in that two plates (5) are inserted from radially opposite sides of the tube (2) between two shafts (4).

Heat exchanger according to one of claims 5 to 8, characterized in that between waves (4) and

Plate (5) resulting heat exchange surface is variable by different wave heights.

Heat exchanger according to one of claims 5 to 9, characterized in that the at least one plate (5) and / or the tube (2) are made of stainless steel.

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