FI63833C - VAERMEVAEXLARE - Google Patents

Description

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Patwitt and Registry Board ............ __ fD

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PftUntr ocn regitteratyralMf) AmOkan utlagd och utl-skriften pubUcrnd 29.0U .83 (32) (33) (31) Pyydetty «Tuoik« ii — Bejtrd prlorttat ^. QLT. 75

Sweden-Sverige (SE) 750 * + 2ΐ6-8 (71) Parca Norrahammar AB, Fack, 562 01 Norrahammar, Sweden-Sverige (SE) (72) Kurt Davidsson, Norrahammar, Sven Ribrant, Norrahammar, Sweden-Sverige (SE) (7 * 0 Yrjänä Vuori (5 * 0 Länunön swap device - Värmeväxlare it

The invention relates to heat exchange devices in which one substance is passed through a plurality of closely spaced tubular coils and the other material is passed through channels formed between or around the coils which are within the walls surrounding the tubular coils.

It is known that an exchanger of the type referred to herein is at its most efficient if the flow takes place in such a way that the two substances run in opposite directions to each other. It is also known that in a thin tube exchanger, where the tubes are wound on a coil to save space, the counterflow is obtained by allowing a tight guide plate to follow the coil, so that the material outside the coil tube is forced to follow this along its entire length.

There are many applications for this type of exchanger, e.g. radiator exchangers, fan exchangers, low water heaters for district heating or boiler centers, ground heating, etc. In each application, the flow ratio between the two substances 2,63833 depends on the desired temperature difference and available pressure drop. When the pipe is of a certain length, in order for the construction to be applicable when the requirements vary, the flow area in the duct outside the pipes can be changed. Previously known types of such exchangers used the principle that the tube coils were stacked on top of each other and the spacing between the turns was changed to suit each application. Alternatively, the pitch of the helix could be varied to adapt the construction to a particular application. In both cases, there are manufacturing difficulties which make the exchangers expensive. In addition, the size of most exchangers then becomes unnecessarily large, causing increasing costs and installation problems.

The present invention contains a solution to the problem that a certain helical division and helical pitch can be maintained in the same construction. Instead of increasing the flow area in the channel outside the pipes when the flow rate is higher than normal, the flow distance is shortened by "short-circuiting" the flow to a certain extent between two adjacent turns of the coil, i. overflow is used. Since this short circuit is local, it does not significantly affect the efficiency of the counter-current exchanger. In this way, the disadvantages described above in connection with the description of the already existing exchanger are eliminated. The expected improvement due to this feature is achieved when the exchanger according to the invention is manufactured according to the characterizing part of claim 1.

An embodiment of a heat exchanger according to the invention is described below with reference to the accompanying drawing, which shows in Fig. 1 a vertical section of the heat exchanger and in Fig. 2 the inside of the heat exchanger, seen from above. The heat exchanger according to the embodiment shown has a tank formed by two end pieces 1, 2 and a cylindrical jacket 3. A central pipe 4 terminates in one end piece and two branch pipes 5, 6 are drawn into the second end piece, a pipe 7 still passes through the jacket. a plurality of tubular coils 8, in the embodiment 3 63833 shown, run three and a half turns about the central axis of the container. The tube coils and branch pipes form the flow path of the second substance, the other flow path of the tank and the pipes 4, 7 the flow path of the second substance.

A conduit 9 is wound on the tubular coils, extending from one end piece 1 and 2 to the other, forming a plurality of helical channels 10 between the tubes 8 and between these and the end pieces. The second substance is forced to flow along these channels and is thus due to close contact with the pipes. As described above, a heat exchanger is at its most efficient if the substances flow countercurrent to each other. In this case, one substance flows clockwise and the other counterclockwise, for example as indicated by the directions of arrows 11, 12 in Figure 2.

With high flow rates in the channels 10, it has been found that the pressure drop through the exchanger becomes abnormally large, which is why a shortened flow distance for this substance would be desirable. According to the invention, the shortened distance is achieved by short-circuiting the flow to a certain extent in two adjacent channels 10 of the coil. Constructively, this short-circuit is realized in the example shown by means of holes 13 in the guide plate of the channel 10 through which the overflow flows.

By varying the hole size and / or hole spacing, the exchanger can be adapted to varying requirements, i. change the flow resistance of the fluid in the channels 10 without the need to change the helical spacing or pitch. Changing the holes is a very simple operation, so that the major drawbacks that have occurred in previous constructions can be eliminated. It is also possible to make the guide plates interchangeable and to select the guide plate for each use with the hole pitch and those hole sizes that provide heat exchange with a certain flow throughput. The choice of guide plate introduces, among other things, increasing flexibility in the use of switches; parts can be standardized, as the only part that needs to be manufactured in multiple models is the wire board.

The implementation now described is, for example, an embodiment of the invention.

Claims (4)

4 63833 ta. Changes can be made to this embodiment within the scope of the invention, for example the tube coils can be rotated, except for the shape of a circle, into an arbitrary oval shape. It is also possible to replace the hole division of the plate with one or more breaks in the lead plate, which then consists of a number of blocks, the breaks acting as overflow points between two adjacent channels 10 and the "capacity" of the overflow point determined by the size of the break. Such implementation alternatives are to be considered as part of the basic idea of the invention as defined in the following claims. The claim A heat exchanger for heat exchange between two substances, wherein one substance is passed through a plurality of tubular coils mounted side by side and the other through a series of ducts (10) formed between or around the coils inside the walls surrounding the coils so as to form said channels between the tubular coils, characterized in that at least one overflow opening (13) is arranged in the guide plate (9) between two channels adjacent to the coil. Device according to Claim 1, characterized in that the overflow opening (13) is formed by a hole made in the guide plate (9). Device according to Claim 1, characterized in that the overflow opening (13) is formed by a break in the helix formed by the guide plate. Device according to Claim 2, characterized in that the guide plate (9) is mounted in such a way that it is replaceable.