DE1912341C3 - Heat exchanger with helically wound pipe layers and process for its manufacture - Google Patents

Description

The invention relates to a heat exchanger with a jacket tube, with one concentric to the jacket tube arranged core tube wound layers of thin tubes, with the core tube opposite the Jacket tube is supported by in the annular space between the two fixed disks, which are made of radial There are webs and their outer ends connecting strips and a method for production such a heat exchanger.

Heat exchangers of this type are already known from FR-PS 12 48 874. The core tube of the one described there The heat exchanger is supported at intervals by three, star-shaped struts in the jacket, wherein the struts are stiffened by cross struts. The struts subdivide the annulus between the jacket and Core tube in several rooms one behind the other. A stiffening of the core tube against acting Bending forces through the struts is neither intended nor performed. On the core tube Bending forces acting would be in the areas in which the struts on the core tube are supported, press in the core tube and cause kinking of the core tube.

In the way the tubes of the known heat exchanger are arranged, problems of deflection occur of the core pipe when winding up the pipe layers. However, such a heat exchanger is unsuitable when the entire length of the individual pipe layers is wound onto the core pipe in one operation should be.

If a certain winding width is exceeded, there is a risk that the horizontal arrangement of the Heat exchanger the core tube with the wound pipe layers as a result of the caused by its weight Deflection is pressed against the jacket pipe. With the heat exchanger installed vertically there is accordingly a risk of the side kinking of the tube provided with the rolled up pipe layers Core tube. In addition, with larger winding widths when winding the pipe layers onto the Core tube, which generally takes place with a horizontal arrangement of the core tube axis, as a result of the large Deflection of the core pipe provided with the pipe layers Difficulties, since the distance between the pipe feeding device and the uppermost fully wound pipe layer over the winding width changes. This disadvantage is very significant, since this distance is in turn due to the increasing number of pipe lays wound on each other

6 ^r >; cn increasing deflection changed. With the arrangement of spacers welded to the individual pipes between the wound pipe layers, as a result of the stronger

Deflection of the wrapped core tube on the welding points will destroy the forces Weld connection occur.

The present invention is therefore based on the object of a simply constructed wound To create tube heat exchanger very large heat exchange surface, which is stable against even with great length a lateral kinking or excessive sagging of the coiled pipe layers.

This object is achieved according to the invention in that the radial webs of the disks with them have ribs of the same length and that they are connected to one another by an outer ring, the inclined slots for the helical winding of the radially following one another over the entire heat exchange length has reaching pipe layers

With a fully assembled heat exchanger, the disks according to the invention result in an inadmissible condition Bending or kinking of the core tube provided with the tube layers avoided because with With the help of the discs, the core tube is always held concentrically and firmly in the jacket tube, which means that A »sheath-core-tube« forming a unit is extremely stable against bending or kinking Winding the pipe layers onto the core pipe has the advantage that the core pipe is supported on all discs during the entire winding process the distance between the pipe feeder of the top fully wound pipe layer practically always remains the same is kept sufficiently small from each other, namely practically none Deflection of the core pipe provided with the coiled pipe layers. The oblique slots in the Discs allow the thin tubes to be rolled up without any problems.

The simple, mass-produced individual parts of the disks are useful with one another as well as at the edges of their contact surfaces with the core tube and jacket tube of the heat exchanger welded this.

In a preferred embodiment of the subject matter of the invention are to the longitudinal axis of the core tube parallel metal strips between two pipe layers wound on top of each other with these, for example by welding or by means of pipe clamps, and with the washers, for example by welding or screwing to the ribs of the discs.

When the heat exchanger is installed vertically, the panes that are attached to both the core tube and the are also attached to the jacket pipe, to accommodate the weight of the pipe layers between each two washers via the metal bands attached to their ribs. The total weight of the pipe layers of the heat exchanger is thus evenly transferred to the core tube and the jacket tube.

The outermost of the wound pipe layers of a thin one between every two discs is expedient cylindrical sheet metal shell, which tightly at one of the two ends with the outer rings of the discs connected is. This allows a good uni flow of the wound pipes through a pipe located between them Gas. It is avoided that this gas in a short-circuit flow into the cylinder annulus between the outermost of the wound pipe layers and the jacket pipe from one end of the heat exchanger got to the other. In addition, the cylinder ring space formed by the sheet metal shells and the jacket tube acts in which there is generally a still gas, heat-insulating.

For the production of the heat exchanger according to the invention, in particular the winding up of the pipe layers onto the core tube, the core tube being arranged and rotated generally horizontally various easy ways.

In the event that the core tube is supported on drive rollers via the discs firmly connected to it ίο is proposed according to the invention, the thin Introduce the tubes through the slanted slots in the discs and after the winding process is complete, the To close oblique slots by welding in filler strips.

In a modification of the concept of the invention, the core tube is when the thin tubes are wound onto this on the outer free ends of the webs welded to it releasably arranged rollers on z. B. Half-cylinder jacket-shaped roll-off tracks support the rolls after the winding process has ended removed and the outer ring pushed onto the webs and welded to them

Another possibility is proposed according to the invention, the core tube when winding the thin tubes on this with the outer ring pulled over at the outer free ends of the with it welded webs to support detachably arranged cylinder ring segments on drive rollers, after completion of the winding process to remove the cylinder ring segments and to push the outer ring onto the webs and to be welded to this.

The heat exchanger according to the invention and the methods listed for its production are explained in more detail below with reference to schematic examples

F i g. 1 in a schematic longitudinal section a vertically installed heat exchanger according to the invention great height,

F i g. 2 shows a heat exchanger according to FIG. 1 in an enlarged view, in particular its essential to the invention Characteristics,

3 and 4 in elevation and side view disc according to the invention with oblique slots,

the F i g. 5 and 6 in elevation and side view the arrangement of a with disks according to FIGS. 3 and 4 provided core tube during the winding process, F i g. 7 in side view with a disk

provided core tube during the winding process, W at the outer ends of the webs instead of the Outer ring on a semi-cylindrical track rolling rollers are detachably arranged,

F i g. 8 shows a side view of a core tube with a disc during the winding process, with instead of the outer ring at the outer ends of the webs mounted on drive rollers, fold-out cylinder ring segments are detachably arranged.

The in the F i g. 1 and 2 shown heat exchanger according to the invention of great overall height and thus a very large heat exchange surface has a jacket tube 1 and a core tube 3 that is firmly connected to this by disks 2. Urn the core tube 3 are ι in successive layers thin Rohi 4 is wound. The individual pipe layers penetrate the discs 2 so that the winding is continuous over the entire length of the core pipe

The disks 2 are through an outer ring 5 and from this extending radially to the core tube 3, webs 7 each having a rib 6 are formed. the

The longitudinal extension of the ribs 6 corresponds to the length of the webs 7. The individual parts of the disk 2 are with each other and at the edges of all their contact surfaces with jacket tube 1 and core tube 3 welded to these.

Metal strips parallel to the longitudinal axis of the core tube are between each two pipe layers that are wound one on top of the other 8 arranged, which are welded to the ribs 6 and also with the individual tubes are connected by welding or by means of pipe clamps. The metal strips 8 serve on the one hand as spacers between the individual pipe layers, on the other hand, by means of them and over the discs 2, the entire Weight of a pipe layer section between two panes 2 on each casing pipe 1 and core pipe 3 transfer.

The entire weight of the core tube is in turn via a thrust washer 9 and a conical piece 10 in the cylindrical foot 11 of the jacket tube 1 initiated. The total weight of the heat exchanger according to the invention can thus in a clear manner from the cylindrical base 11 to one in the drawing not The foundation shown can be transferred.

The outermost of the wound pipe layers is between two discs 2 of a thin cylindrical Surrounding sheet metal shell 12, which is tightly connected to the outer rings 5 at the upper end. This measure enables a good flow around the pipe layers through the gas located between them and through them Over almost the entire height of the heat exchanger according to the invention a heat-insulating against the environment Cylinder annulus created.

A medium to be heated, indicated by arrows A , flows, for example, into the individual tubes 4 at the lower end of the heat exchanger and out of these again at its upper end. A medium to be cooled, marked by arrows B , is introduced at the upper end of the heat exchanger into the spaces between the individual tubes 4, flows through them, giving off heat to the medium A located in the tubes 4 and leaves the heat exchanger at its lower end.

While the pipe layers are being wound onto the core pipe 3, it is arranged horizontally and rotated There are various possibilities for winding up the pipe layers, especially you Penetration of the panes 2.

A possibility for this is shown in FIGS. 3 to 6. The core tube 3 is thereby over the with it welded. Discs 2 supported on drive rollers 13 Die in successive pipe layers alternately right and left wound, thin tubes 4 are replaced by corresponding ones in the outer ring 5 arranged inclined slots 14 inserted into the spaces 15 between the webs 7 and on the Core tube 3 wound up. After completion of the winding process, the inclined slots 14 can through Welding of filler strips, not shown in the drawing, are closed.

Another way of winding is in

ίο Fig. 7 shown. The core tube 3 is supported on semi-cylindrical roller tracks 17 by rollers 16 detachably arranged at the outer ends of the webs 7a welded to it, and the individual pipe layers are wound onto the core tube 3 in the spaces 15a between the webs 7. Then the rollers 16 together with their fastening device 16a are removed and the outer ring 5a is pushed onto the webs 7a and welded to them.
Finally, the following results in FIG. 1 for the winding up. 8: The core tube 3 is supported on drive rollers 19 via cylinder ring segments 18 which are detachably arranged at the outer ends of the webs 7a welded to it. After the cylinder ring segments 18 have been unfolded, the individual pipe layers are introduced into the spaces 15a between the webs 7a around an axis of rotation 20 extending radially to the core pipe 3 in the extension of the webs 7a and wound onto the core pipe 3. After completion of the winding process, the cylinder ring segments 18

jo together with their fastening device 18a of the webs 7a removed and the outer ring 5a is pushed onto the webs and welded to them.

If in the last-described possibility of winding the tubes 4, the core tube 3 is always in Is rotated in the direction of arrow 20, an automatic unfolding of the cylinder ring segments takes place during winding 18, the fold-out angle of the cylinder ring segments 18 advantageously being substantial is smaller than when the core tube 3 is rotated in the opposite direction.

The heat exchanger according to the invention replaces several due to its very large heat exchange surface previously known heat exchangers of maximum size. It is therefore much more economical than the known ones Heat exchanger, which is not only a consequence of the elimination of many supply and discharge lines, curved floors and the like and a reduction in cold or heat losses, but also in savings Floor space, especially when installed vertically

so the heat exchanger; is.

For this purpose 4 sheets of drawings

Claims (6)

Patent claims: 1. Heat exchanger with a jacket tube, with layers of thin tubes wound onto a core tube arranged concentrically in the jacket tube, the core tube being supported against the jacket tube by in the annular space between the two fixed disks, which consist of radial webs and strips connecting their outer ends, thereby characterized in that the radial webs (7,7a,> of the disks (2,2a,> have ribs (6) of equal length with them) and that they are connected to one another by an outer ring (5, 5a) , the inclined slots (14) for having helical winding of the radially following one another over the entire heat exchange length reaching pipe layers 2. Heat exchanger according to claim 1, characterized by metal strips (8) parallel to the longitudinal axis of the core tube (3) between each two tube layers wound on one another, which are connected to these and to the disks (2, 2a) . 3. Heat exchanger according to claim 1 or 2, characterized in that between two discs (2, 2a) the outermost pipe layer is surrounded by a thin cylindrical sheet metal shell (12) which at one end with the outer rings (5, 5a) of the disc (2,2a,) is tightly connected. 4. A method for producing a heat exchanger, essentially according to one of claims 1-3, wherein during the winding up of the pipe layers, the core pipe is arranged horizontally and rotated and the thin pipes wound in successive pipe layers, for example alternately right and left, into the spaces between the Bars are inserted and wound onto the core tube, characterized in that the core tube (3) when the thin tubes (4) are wound onto this via rollers (16) which are detachably arranged at the outer free ends of the bars (7a) welded to it, for . B. semi-cylinder jacket-shaped roll-off tracks and that after the end of the winding process, the rollers (16) are removed and the outer ring (5a ) is pushed onto the webs (7a) and welded to them. 5. A method for producing a heat exchanger essentially according to one of claims 1-3, wherein the core tube is arranged horizontally and rotated during the winding up of the tube layers and the z. B. alternately right and left wound, thin tubes are inserted between the webs and wound on the core tube, characterized in that the core tube (3) when winding the thin tubes (4) on this with the outer ring (5a) withdrawn over to the outer free ends of the cylinder ring segments (18) detachably arranged with iiim welded webs (7a) is supported on drive rollers (19) and that after completion of the winding process the cylinder ring segments (18) are removed and the outer ring (5a ) is pushed onto the webs (7a) and with this is welded. 6. A method for producing a heat exchanger essentially according to one of claims 1 to 3, whereby the core tube is arranged horizontally and rotated while the tube layers are being wound up is that in successive pipe layers z. B. Alternating right and left winding, thin tubes inserted between the webs and onto the Core tube are wound and the core tube over the discs firmly connected to it Drive rollers is supported, characterized in that the introduction of the thin tubes (4) through the inclined slots (14) and that after completion of the winding process, the inclined slots (14) can be closed by welding in filler strips.