DE29612295U1 - Mat-shaped heat exchanger - Google Patents

Description

Mat-shaped heat exchanger

The invention relates to a heat exchanger according to the preamble of claim 1.

Fig. 4 shows a schematic representation of part of such a heat exchanger according to the prior art. This shows the end area of a so-called capillary tube 1, i.e. a tube with an external diameter in the range of 2 to 5 mm. The capillary tube 1 shown and a large number of parallel capillary tubes, each at a short distance from one another, run parallel to the plane of the drawing. The end of the capillary tube 1 shown and the corresponding ends of the parallel capillary tubes are open and open into a trunk 2, which extends transversely to the capillary tubes 1. In the same way, the other ends of the capillary tubes 1 are connected to another trunk. The trunks 2 serve to distribute or

Collection of a medium that is warmer or colder than the environment, preferably water, to or from the capillary tubes 1, whereby a heating or cooling effect is achieved by heat exchange through the wall of the capillary tubes 1. The trunk 2 is connected to a connection 4 for the supply of the medium.

The mat of capillary tubes 1 and the trunks rest on a metal ceiling plate 5, which has a raised edge. The heat transfer between the medium and the environment takes place essentially between the media and the ceiling plate 5, so that the closest possible contact between the capillary tubes 1 and the ceiling plate 5 is desirable. However, as can be seen from Fig. 4, the capillary tubes 1 open centrally into the trunk 2 and must therefore be diverted away from the ceiling plate 5. As a result, a strip 3 of the ceiling plate 5 remains unoccupied and is thermally suitable for the desired

Heating or cooling is not effective. The connection is located within the edge of the ceiling panel 5 directly on this and also causes a widening of the strip 3.
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It is therefore the object of the present invention to improve the known mat-shaped heat exchanger for laying on a sheet metal plate, consisting of flexible tubes arranged in a plane with an outer diameter in the range between about 2 and 5 mm for the passage of a medium that is warmer or colder than the environment, and trunks that are connected to the tubes in their end region for the supply and discharge of the medium, in such a way that the flat area of the sheet metal plate is completely

constantly used for heat exchange and thus a higher efficiency can be achieved.

This object is achieved according to the invention by the features specified in the characterizing part of claim 1. Advantageous further developments of the heat exchanger according to the invention emerge from the subclaims.

Because the tubes are guided tangentially past the trunks at a predetermined distance from their ends and are connected to them at their respective points of contact, and because the ends of the tubes are closed, better heat transfer is achieved because the capillary tubes reach to the edge of the sheet metal plate and rest on it along their entire length. The operation of the connection, which usually protrudes laterally beyond the trunk, is also no longer hindered because it no longer has to lie 0 tightly against the edge of the plate.

An additional operation is required during the manufacture of the heat exchanger to close the ends of the capillary tubes. However, this does not lead to an increase in costs in automated production, since this operation is carried out in parallel with the connection of the capillary tubes to the trunks.

According to an advantageous further development, the trunks have incisions at the connection points with the tubes, which are adapted to the outer circumference and each surround a passage opening in the tube wall. This measure reduces the risk 5 that when welding or soldering the

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Capillary tubes with stems that close the openings for the medium to pass through.

The invention is explained in more detail below using exemplary embodiments shown in the figures. They show:

Fig. 1 is a schematic sectional view

of a part of a heat exchanger according to a first embodiment of the

Invention,

Fig. 2 a schematic sectional view

of a part of a heat exchanger according to a second embodiment of the

Invention,

Fig. 3 is a schematic diagram of the

Fig. 2 90° offset sectional view of part of a heat exchanger

schers according to the second embodiment of the invention, and

Fig. 4 is a schematic sectional view of a part of a heat exchanger according to

the state of the art.

In Figs. 1 to 3, the same reference numerals as in Fig. 4 0 are used to identify the same parts.

According to Fig. 1, the parallel capillary tubes run on the metal ceiling plate 5 from one edge to the opposite edge. The ends of the capillary tubes 1 are closed. The trunks 2 are in each

The capillary tubes 1 are placed on the respective end area, but at a predetermined distance from each end of the capillary tubes 1 and connected to them, for example by welding or soldering. In the area of the connecting parts, a passage opening is provided in the wall of the capillary tube 1 for the passage of the medium, so that this can enter from the trunk 2 into the capillary tube 1 or from the capillary tube 1 into the trunk 2. The heat is transported into the part of the capillary tube 1 arranged between the trunk 2 and the edge of the ceiling plate 5 by the medium located in it, so that the heat transfer between the capillary tube 1 and the ceiling plate 5 takes place evenly across its entire width. The connection 4 is also arranged at a predetermined distance from the edge of the ceiling plate 5, so that it can be operated without hindrance.

In the design according to Figs. 2 and 3, the trunk 2 is provided with incisions which are located at the intersection points with the capillary tubes 1 and which correspond to their outer contour, so that a tight connection is made between the trunk 2 and the capillary tubes 1. The connecting seam surrounds the passage opening 6 at a relatively large distance, so that the risk of the passage opening 6 being inadvertently closed when closing or soldering is very low.

0 For better heat transfer between the capillary tubes 1 and the ceiling plate 5, the capillary tubes 1 can have a flattened cross-section. This also improves the contact between the capillary tubes 1 and the trunks 2. 35

The capillary tubes 1 and the stems 2 are preferably made of plastic; however, they can also be made of a metal that is as heat-conductive as possible, for example copper.

Claims (5)

Protection claims 1. Mat-shaped heat exchanger for laying on a sheet metal plate, consisting of flexible tubes arranged in a plane with an outer diameter in the range between about 2 and 5 mm (capillary tubes) for the passage of a medium that is warmer or colder than the environment, and trunks that are connected to the tubes in their end area for the supply and discharge of the medium are connected, characterized in that the tubes (1) are attached tangentially to the trunks at a predetermined distance from their ends (2) passed and in their respective contact connection point and that the ends of the tubes (1) are closed. 2. Heat exchanger according to claim 1, characterized in that the tubes (1) and the stems (2) made of plastic. 3. Heat exchanger according to claim 1, characterized in that the tubes (1) and the stems (2) made of metal. 4. Heat exchanger according to one of claims 1 to 3, characterized in that the stems (2) at the connection points with the tubes (1) de- 0 outer circumference, each with a diameter have incisions surrounding the outlet opening (6) in the tube wall. 5. Heat exchanger according to one of claims 1 to 4, characterized in that the tubes (1) have a flattened cross-section.