CH616223A5 - Heat exchanger composed of one or more plastic hoses or plastic tubes for aggressive media. - Google Patents

Description

The object of the invention is now to avoid these disadvantages and to find a design which eliminates possible kinks and at the same time accommodates longer lengths of plastic hose in a handy construction in a space-saving manner. This is achieved with a heat exchanger, which is characterized in that a support device for the hoses or pipes is arranged in the form of perforated plastic flat material made of the same type of plastic, through which the hoses or pipes are drawn in a ring-spiral. This ensures that more exchange surface can be installed in the same available space of the container. In addition, with this version the hoses or pipes of the heat exchanger can be attached so that they do not touch.

lie at a uniform distance from one another in the liquid or the gas and the surrounding liquid or gas flows around them on all sides. The support device can consist of a support and spacer cross, the outer arms of which are fixed to one another by spacers, which are also made of plastic, preferably corrosion-resistant plastic, or are coated with such. The support and spacer cross can have staggered rows of holes through which the hose is drawn in in a circle, for example from the inside to the outside. After the hose has been inserted into the innermost row of holes, the next outer row can be made in a spiral shape during manufacture.

The arms of the support and spacer cross, made of flat material, the number of which is preferably 4, 6 or 8, depending on the size of the heat exchanger, can be connected in the outer end region by means of spacer rods, which likewise consist of corrosion-resistant plastic or are coated with this. At the same time, a carrying and fastening rod can pass through this spacer cross, as a result of which fastening in the container is possible. If the support and spacer cross is made of the same material, the thermal expansion of this holder for the hoses is almost identical to that of the hoses, thereby avoiding thermal stresses that can lead to damage.

Exemplary embodiments of the invention are illustrated schematically in the drawings and are explained below. Show it:

Figure 1 is a schematic side view of a heat exchanger,

Figures 2 and 2a on a larger scale a top view of one arm of the support cross,

Figure 3 on a larger scale a representation of the crossing point of the support and distance cross,

Figure 4 is a top view of the heat exchanger,

Figures 5 and 6 show two versions of a heat exchanger.

Figure 1 shows a carrying device in the form of a support and spacer cross 1. The individual arms of this support cross are provided in rows with holes 2, as shown in Figures 2 and 2a, through which the corrosion-resistant plastic tube 3 is pulled in such a way that it is repeated several times winding spiral from the inside out. With larger heat exchangers, it is possible to accommodate several plastic hoses next to each other in the same spiral arrangement in a corresponding cross. The flat material 4 of the support and spacer cross 1 is connected at the crossing point so that no screws or rivets made of non-corrosion-resistant material are required, e.g. by means of a plug connection with slots 5, as shown in Figure 3. To avoid deposits at the intersection of the flat material, the support and spacer cross can be implemented as shown in Figure 4. For this purpose, the pieces of flat material 4, which are bent at an angle, are only connected in the center by round spacer bolts 6. As a result, a flowless dead space in which deposits can form is avoided at the connection point of the support and spacer cross. This constructive arrangement of the hoses means that only large radii of curvature occur and thus kinking of the hoses is excluded. With 7 and 8, the inflow and outflow sides for the heat exchanger medium are designated. In Fig. 4 the fastening or Carrying rod 9 drawn between the arms of the support and spacer cross 1, the arms being fixed against the rod by appropriate pushing or pushing

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screw sockets 10 is reached. Figure 5 shows how the It is of course possible to guide the drawn

Spacers 11 between the individual arms of the cross can also be made in an oval shape as shown in Figure 6.

can be arranged. men.

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1 sheet of drawings

Claims (5)

616 223 1. Heat exchanger made of one or more plastic hoses or pipes for aggressive media, consisting of a specific support device for the plastic hoses or pipes to be hung in the liquid bath to be cooled or heated, characterized in that a supporting device for the hoses or pipes are arranged in the form of perforated plastic flat material (4) made of the same type of plastic through which the hoses or pipes (3) are drawn in in an annular-spiral manner. 2. Heat exchanger according to claim 1, characterized in that the support device consists of a support and spacer cross (1), the outer arms of which are fixed to each other by spacers (11), which are also made of plastic or are coated with such. 2nd PATENT CLAIMS 3. Heat exchanger according to claim 2, characterized in that one or more spacers (11) are designed so that they serve both as a support and as a fastening device (9) for the heat exchanger. 4. Heat exchanger according to claim 2, characterized in that the parts of the support and spacer cross (1) do not cross at the center to avoid deposits, but are only connected to each other by spacer bolts (6). 5. Heat exchanger according to one of claims 1-4, characterized in that the plastic hoses or tubes are made of fluorine plastics. The heating or cooling of aggressive media creates considerable corrosion problems. Heat exchangers which are equipped with one or more hoses or tubes made of corrosion-resistant plastics, in particular fluoroplastics, are therefore preferably used for such liquid or gaseous media. The walls of such plastic hoses are kept as thin as technically possible, since plastics are generally very poor heat conductors. The hoses of such a heat exchanger, e.g. according to DT-Gbm 7 045 418, but tend to buckle at the bending points due to mechanical stresses, as well as from currents and thermal stresses. In order to avoid this damage, e.g. already proposed by DT-Gbm 7 329 496 to guide the plastic tubes of the heat exchanger in the form of an ordinary tortuous cycloid, which is used in the form of a flat, helical screw in the medium to be heated or cooled. However, it has been found that the hose rings in this known design are difficult to connect to an easy-to-use heat exchanger unit and that it is difficult to accommodate longer hose lengths.