FR2588071A1 - HEAT EXCHANGER WITH PLASTIC TUBES - Google Patents

Abstract

HEAT EXCHANGER. THIS HEAT EXCHANGER INCLUDES PIPES OR TUBES OF PLASTIC MATERIAL FOR AGGRESSIVE FLUIDS WITH AT LEAST ONE PIPE OR TUBE, IN PARTICULAR IN FLUORINATED PLASTICS, CHARACTERIZED BY THE FACT THAT THE PIPE OR TUBE 35 TO 38 IS SHAPED IN THE FORM OF ROUND OR NOT SEEN IN PLAN, IN THE KIND OF WINDINGS OF A HELICOIDAL SPRING AND IS HELD BY A SUPPORT STRUCTURE, AND THIS SUPPORT STRUCTURE PRESENTS SEVERAL ELEMENTS IN THE FORM OF PLATES 22 TO 24 THAT EXTEND IN THE DIRECTION LONGITUDINAL OF THE PITCH OF THE SPIRES OF THE PROPELLER AND WHICH ARE HELD TOGETHER, THE PIPE OR TUBE WINDINGS PASSING THROUGH PASSAGES 30 IN THE PLATE-SHAPED ELEMENTS, AND THE PASSAGES BEING ARRANGED IN CORRESPONDENCE WITH THE PITCH OF THE PIPE OR TUBE WINDINGS.

Description

The invention relates to a heat exchanger made with pipes, or

  plastic tubes for aggressive media with at least one pipe,

  or tube, in particular fluorinated plastics.

  Heat exchangers are known in the form of "bundles", in which a plurality of pipes, or tubes, are implanted parallel to one another between two end pieces. These beams thus have a large number of inputs and outputs. The large number of connections involved implies a certain risk of maintenance or repair. In addition, in the known beam exchangers, only one direction of circulation is possible, that is to say that the fluid flows in the pipes entering a room

  end and exiting through the other.

  In addition, heat exchangers are known whose tubes made of metallic materials, for example made of titanium, are arranged in a helix. Such dipped heat exchangers are for example installed so as to be / in a container which contains the more or less liquid fluid to be heated or cooled. In such known exchangers, the tubes or pipes are rigid and therefore self-supporting. What is in this case advantageous, is a

  good heat exchange with a small footprint.

  As pipes or tubes made of plastic for aggressive fluids, in particular fluorinated plastics, are not self-supporting, so far no helical heat exchangers made with pipes or tubes of heat are known. this genre. Heat exchangers of the kind mentioned at the beginning are known, in which the pipes are arranged in the form of screws, spirals or meanders. In this case, the inlet and the outlet can be provided on the same side or on different sides. However, there is a disadvantage in the fact that such heat exchangers require a relatively large amount of space because of the arrangement of the pipes, because the pipe is disposed substantially in a plane and therefore the heat exchanger has a

flat configuration.

  The object of the invention is to create a heat exchanger of the kind mentioned at the beginning, which is of a compact configuration, so that it can be placed in

a narrow space.

  In order to achieve this objective, it is provided according to the invention that the pipe or the tube is arranged in windings of the type of those of a helical spring, these windings being, seen in plan, round or not, and held by a bearing structure, that the bearing structure has a plurality of plate-shaped members which extend in the longitudinal direction of the helical windings and which are held together, and that the passages of the windings of pipes or tubes are made to through the plate-shaped elements, the passages being arranged in correspondence with the pitch

  windings of pipes or tubes.

  Thanks to the supporting structure, which is preferably also made of plastic, the windings are held, or supported, so that a compact construction mode, and therefore in good heat exchange is possible with a low

footprint.

  In a preferred embodiment of the heat exchanger, non-round, "in-length" windings are provided so that each individual winding has two portions facing each other approximately parallel to one another. , and which are connected at their respective ends by

  pipe elements that have an approximate half-size

  circle. For this, the invention provides that the support structure has end pieces held by a plurality of distance holding bars having the same direction and of substantially equal length, for guiding the pipe, and between the parts at the end, plate-shaped elements are arranged at intervals on distance holding bars to act as support and spacer elements. Thus, it is possible to guide the pipe with a large number of pipe elements arranged in the same direction, the overturning of the pipe being obtained in the end pieces, and the pipe elements being a part of a single pipe conforming continuously. The pipe elements can thus be placed in several planes arranged with a small distance relative to each other. These plans can be parallel to each other, or oblique between them. In this way, a heat exchanger is produced which is particularly suitable for uses in which heaters or heating plates have hitherto been used because, thanks to the particularly compact construction method obtainable according to the invention, only a small volume is needed

for the heat exchanger.

  In an appropriate embodiment of the invention, the end pieces may be provided with a plurality of turning guides for the pipe, these being provided next to one another or one above the other. 'other. These turning guides are advantageously constituted by channel-shaped pipe supports separated from one another by ridges, which preferably extend over a turning range of about 180. These pipe supports prevent the plastic pipe from pinching under the effect of heat, because it is relatively "soft" compared to those made of other plastics, especially since a rollover tight pipes without

support would be problematic.

  According to another characteristic of the invention, it can be provided that the plate-shaped elements have the form of plates or disks. This configuration is particularly simple construction and allows an effective and protective maintenance of the pipe. Since an outer protective strip is formed because of the openings shaped passages, any contact is thus avoided to the pipe with the ground or with the wall of the recipient container.

the heat exchanger.

  According to another characteristic of the invention, it is possible for the spacer bars to pass through openings in the support and spacer elements and are fixed by screwed or clamping elements. It is particularly favorable that the spacer bars have clamping grooves

  to receive the clamping elements.

  It is also possible that the spacer bars are made in pieces in the longitudinal direction and joined by their faces facing one towards

the other by screwed connections.

  In another form of the invention it is possible for the spacer bars to be

  screwed with the end pieces.

  According to another characteristic of the invention, it is possible to provide a foot support on at least one end piece. Such foot support prevents direct contact of the tube with the floor or walls of containers or other similar objects which receive the heat exchanger. It is naturally too

  possible to place the exchanger on such a foot support.

  In this way a vertical arrangement is possible and moreover the support foot can be used to ensure a spacing, for example to maintain the heat exchanger outside the sludge zone which covers the bottom

a muddy bath.

  Another advantage of the invention lies in the fact that several heat exchangers according to the invention can easily be combined into shaped bundles.

of cascade.

  Another embodiment of the invention relates to a heat exchanger in which at least one pipe or a plastic tube is placed in round coils seen in plan, in the kind of winding of a coil spring and held by a support structure. This support structure here has a plurality of pipe supports which extend radially about an imaginary longitudinal median axis and which are arranged along this axis, in the form of struts, and which are, at least in one their common front ends, fixed to a front support (eg cover). The strut-shaped pipe supports are formed of holding plates provided with holes for the passage of the pipe, which are held together by spacers. It is advantageous that thanks to the support structure, stability and resistance to the pipe or tube, or pipes or tubes are provided in the case of a helical arrangement with round turns, so that it is realized a compact heat exchanger that can be placed in a narrow space. The frontal support is preferably constituted by a cover provided with connections or passages for the pipes or tubes. This lid can easily be adapted to the opening of a container in which the exchanger must be introduced. So he is

  realized a compact unit and of simple construction.

  The strut-shaped pipe supports may in another embodiment of the invention be formed of holding plates provided with holes for the passage of pipes which are held together by spacers. These spacers are preferably in the form of circular segments. For attachment of the tube-shaped pipe supports to the end support is provided in another configuration according to the invention, supports which are themselves connected to the front support, for example, the

lid.

  If the supports are attached to a front support preferably forming a cover, the pipe arranged helically connects directly to the "lower face" of the cover. Such a heat exchanger is then appropriate in the case where the container, in which it must be introduced, is completely filled with the fluid to be heated.

or cool.

  But it is also possible to connect the pipe supports with extensions, on the front support, preferably the cover. These extensions may optionally be themselves adjustable in length. In this way the heat exchanger can be immersed in a container which is not completely, but only partially, filled with

  fluid to be heated or cooled.

  There is of course also the possibility, without any difficulty, to have a frontal support to both

  front ends of the support structure.

  The invention is explained below according to the

  examples of execution shown in the drawings Joints.

  Figure 1 shows a schematic side view

  a heat exchanger according to the invention.

  Figure 2 shows a plan view of a

arrangement according to Figure 1.

  Figure 3 shows a plan view of a part 25887

  partially cut end.

  Figure 4 shows a side view of the room

end according to Figure 3.

  FIG. 5 shows a side view of a corresponding plate-shaped support and spacer element

  approximately at line V-V of FIG.

  Figure 6 is a side view of a bar of

maintaining distance.

  FIG. 7 is a schematic representation of an example of execution of the connection between a distance holding bar and a support and spacer element

shaped plate.

  FIG. 8 is a clamping element used for the connection in the arrangement according to FIG.

face and side.

  Figure 9 is a schematic side view of a

  another embodiment of the invention.

  FIG. 10 is a side view of another embodiment of the invention in which the heat exchanger is connected to a front support formed in

  lid, thanks to extensions.

  FIG. 11 is a view of the supports for the embodiment according to FIG. 9 in a

"exploded" representation.

  FIG. 12 is a view of the supports with extensions for the embodiment in FIG.

  , in an "exploded" representation.

  A heat exchanger shown diagrammatically in FIGS. 1 and 2, has a bearing structure 0 with end pieces 2 and 3 which are held at the end ends by a plurality of distance holding bars 4, 5 having the same direction and substantially the same length and which are arranged with gaps between them. Between the end pieces 2 and 3 are arranged, 3o 8ut '. distance holding bars and with gaps between them, spacers 6 in the form of plates. The end pieces 2, 3 have, as can be seen in FIG. 4, several turning guides 7 arranged one above the other and intended to receive a pipe 8. The turning guides 7 are forms in the illustrated execution example of pipe supports in

  form of channels that are separated by ridges 9.

  The plate-shaped supporting and spacing elements have holes 10 whose diameter corresponds to the outside diameter of the distance holding bars 4, 5. In the embodiment shown, four holes 10 are shown arranged with a gap between them. Correspondingly, the arrangement shown shows four distance holding bars 4, 5, only two of which are visible in FIG. 2. These distance holding bars are connected to the support and spacer elements 6 by means of elements. clamping members 11 which are slotted and are housed in grooves 12 distributed along the length of the distance holding bars so that the gap existing between two grooves 12 corresponds to the thickness of the support elements and

  spacer 6 in the form of plates.

  At the ends the distance holding bars have tapped holes 13 on the front side. Fixing the end pieces 2 or 3 is done with screws (not shown) which pass through the screw passages 14 formed for this in the end pieces. These end pieces are then placed against the support and spacing elements of the ends which are blocked from the side.

  inside by clamping elements 11.

  The preceding plastic support structure serves to receive a pipe 8, which has, as can be seen in FIGS. 1 and 2, zones of windings arranged very closely next to one another, one atop the other, and parallel, with at the ends, turning zones around the end pieces 2, 3. The pipe ends A or B are arranged in the embodiment shown in FIG. one of the tips. The end of pipe B could naturally be arranged at the other end. The pipe 8 is arranged - starting with the lower winding or the upper winding - through the passages 15 of the support and spacing elements 6 each placed at about the same height and housed in the end pieces by media

of pipes 7 in the form of channels.

  Both the support structure and the pipe are made of plastic, in particular plastic

fluoridated.

  In the arrangement according to FIGS. 9 to 12, a bearing structure generally indicated by 21, has holding plates 22, 23 and 24, as well as another holding plate not shown in FIG. 9. The holding plates extend around an imaginary median axis 25 in its longitudinal direction, and are arranged radially outwardly, that is to say in the embodiment shown, with four retaining plates arranged on the cross, in a

  imaginary section through the median longitudinal axis 25.

  The holding plates are held together by spacers 28 or 29 in the form of circular segments. In the form of strut-shaped pipe supports formed in the holding plates, a large number of holes are provided through which plastic pipes or tubes, in particular fluorinated plastics, (not shown) can be arranged in form

  propeller, so in principle in the manner of a thermo-

  diver. In the embodiment shown, the support structure serves to receive two pipes or plastic tubes to be arranged in the form of a helix. Correspondingly, four pipe connections 31, 32, 33 and 34 are provided. The pipes are schematically

designated 35, 36, 37 and 38.

  The helical arrangement of the pipe is

  not shown for clarity.

  The pipe connections 31 to 34 are placed in a front support 39 in the form of a lid such that, from the upper part of the lid (according to FIG. 9), connection pipes can be continued. To connect the pipe supports 22, 23, 24 in the form of struts of the support structure with the cover 39, fasteners 40 are provided, one of which is shown on a larger scale in FIG. a nut 41 with an external thread 42 on which a nut 43 can be screwed after the bolt 41 has been passed through the cover 39 from its

lower side.

  The end piece 44 which is at the bottom of the cover has a slot 45 which has a shape such that one of the holding plates 22, 23, 24 can be indroduced in this slot and blocked by means of

  of a screw passing through a transverse bore 46.

  The heat exchanger according to FIG. 9 can for example be immersed in a container containing a liquid, the lid 39 closing the upper opening of

this container.

  The variant described hereinafter with FIGS. 10 and 12 is distinguished from the embodiment according to FIGS. 9 and 11 only by fasteners of different shape for connecting the support structure 21 and the cover 39. see Figure 10, the fasteners designated therein 47 are shaped so as to be adjustable in length in the direction of the arrow C. The holding plates 22, 23, 24 are placed here in slots 45 'd an element 48 having a bore 49 with a tapping 50, in which the external thread 51 of an extension piece 52 can be screwed, said piece passing at its other end, which has an external thread 53, through the cover and It is fixed at the top by means of a nut 54. The other parts according to FIG. 10 correspond to the parts described with reference to FIG. 9 and are not the subject of new explanations. The embodiment according to Figure 10 is then very interesting, if the fluid to be heated or cooled does not fill the entire container in which the heat exchanger is to be implemented, but only a portion of the container. Thanks to the extension elements it is possible to choose an arrangement in which the heat exchanger

  properly speaking, plunges into the fluid.

Claims (17)

  1. Heat exchanger comprising plastic pipes or tubes for aggressive fluids with at least one pipe or tube, in particular of fluorinated plastics, characterized in that the pipe or tube (8, or 35 to 38) is in the form of windings, round or not seen in plan, in the kind of the windings of a helical spring and is held by a bearing structure, and this support structure has several plate-shaped elements (6 or 22 to 24) which extend in the longitudinal direction of the pitch of the helix turns and which are held together, the pipe or tube windings passing through passages (15 to 30) in the plate-like elements, and the passages being arranged in correspondence with the pitch of the windings of the pipe or tube.   2. Heat exchanger according to claim 1, characterized in that the support structure has end pieces (2, 3) for the overturning of the pipe, which are held by several bars (4, 5) for maintaining of distance having the same direction and substantially the same length, and that between these end pieces are arranged plate-shaped elements on the distance holding bars, with gaps   between them, to serve as support and spacer elements.   Heat exchanger according to Claim 2, characterized in that the end pieces (2, 3) have a plurality of pipe reversing guides provided one beside the other or above each other. 4. Heat exchanger according to claim 3, characterized in that the reversing guides are constituted by pipe supports (7) in the form of   channels, separated from each other by ridges (9).   5. Heat exchanger according to claim 4, characterized in that the pipe supports (7) extend over a reversal area of 1800. 6. Heat exchanger according to one of   claims 1 to 5, characterized in that the   plate-shaped elements (6) have the form of plates or disks.   7. Heat exchanger according to one of the   Claims 1 to 6, characterized in that the   distance holding bars (4, 5) pass through the support and spacer elements and are locked by means of   clamping elements (11) and / or screw elements.   8. Heat exchanger according to one of   Claims 1 to 6, characterized in that the   distance holding bars have grooves of   clamping (12) for receiving clamping elements (11).   9. Heat exchanger according to one of   Claims 1 to 8, characterized in that the   distance holding bars (4, 5) are divided into pieces in the longitudinal direction and are connected at the front ends facing each other by means of screw connections.   10. Heat exchanger according to one of   Claims 1 to 9, characterized in that the   distance holding bars (4, 5) are screwed together with the end pieces (2, 3).   11. Heat exchanger according to one of   Claims 1 to 10, characterized in that   provides a foot support device which can be placed on the heat exchanger (1) either laterally or end. 12. Heat exchanger according to claim 1, characterized in that the support structure (21) for 14 2588071   the tubes or pipes (35 to 38) of plastic material, has a plurality of pipe supports which extend radially about an imaginary longitudinal median axis and are arranged in the direction of this axis, and which are attached to at least one of their front ends common to a front support (cover 19), and that the support tube-shaped supports are constituted by holding plates (22, 23, 24) provided with bores (30) for the passage of the pipe, which are maintained between them by spacers (28, 29).   13. Heat exchanger according to claim 12, characterized in that the front support is constituted by a cover (39) with connections (31 to 34) or passages for pipes or tubes 14. Heat exchanger according to claim 13, characterized in that the spacers are in shape of a circle segment.   15. Heat exchanger according to the claims   12 to 14, characterized by the fact that the strut-type pipe supports are fixed at their end, facing the front support (cover 39), to supports (40) which on their side are connected with the front support (cover 39).   16. Heat exchanger according to claim 15, characterized in that the supports (40) are fixed directly to the front support (cover 39) or to the   brackets provided on the end side.   17. Heat exchanger according to claim, characterized in that the pipe supports are fixed to the front support (cover 39) by extension elements which may be optionally adjustable. lengthways.