DE7912786U1 - HEAT EXCHANGER - Google Patents

Description

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D-4000 Dusseldorf ι "diplV-ing. WOLFRAM WATZKE

MaIkastenstraEe2 DIPL.-ING. HEINZ J. RING

Our reference: 20,000 Date: May 2, 1979

R. & G. Schmöle Metallwerl · - «- GmbH & CO.KG., Fröndenbergsr Str. 5750 Menden 1

Heat exchanger

The invention relates to a heat exchanger with an outer tube and at least one inner tube, which on its inside is provided with mutually parallel grooves which are separated from one another by webs.

Heat exchanger tubes for the evaporation of halogenated hydrocarbons are known in the form of drawn-in aluminum star profiles in smooth tubes in various dimensions and designs. On the one hand, this results in a larger surface or the number of nucleation sites that are decisive for evaporation ^; increased and also enables an increase in turbulence. Because of the 'O high specific pressure loss, these tubes are used only in limited lengths and are therefore unsuitable for coaxial systems.

On this basis, the invention is based on the object of a To create heat exchangers with particularly good heat transfer performance,

For a heat exchanger, this task is described at the outset This type is solved in that the grooves and webs in the inner tube run coaxially and have the same dimensions, the width 'and the depth be 0.7 to 1 mm.

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The heat exchanger designed according to the invention has the advantage that The liquid refrigerant flows in the kappilararti ^ .wn grooves and intensely evaporated because of the large specific surface area, while the entire inner space of the pipe is used to flow away Low density steam is used.

For higher outputs, which require higher refrigerant throughputs, three inner tubes can also be arranged in a star shape offset from one another by ^{1 ^ 1} O ^{0 in an outer tube.}

For use in systems that require additional separation between the refrigerant flowing inside and the medium flowing outside is required, can be applied to the inner pipes a safety pipe with longitudinal grooves on the inside, with the grooves either free at the ends remain or are combined with a valve to operate an optical or acoustic warning system in the event of a leak to be able to set.

A support of the outer tube from the inner one is provided in the form of brackets or spacing grooves in the outer tube to prevent vibration noises to avoid.

More details, features and advantages of the subject matter of Invention emerge from the following description and the Associated drawings, in which preferred embodiments of a erfindungsgeraäß trained heat exchanger and a Performance diagram are shown. In the drawings show:

1 shows a heat exchanger with an outer and an inner tube in longitudinal section;

2 shows the same heat exchanger in cross section;

5 shows a heat exchanger with an outer tube and three inner tubes in cross section;

4 shows a heat exchanger with an outer tube and an inner tube as well as a safety tube pulled onto the inner tube in cross section;

5 shows a view of a heat exchanger wound into a helix;

6 shows a performance diagram,

A heat exchanger is in its simplest form from a smooth outer tube 1 and an inner tube 2 provided with a profiling on its inside, with a to cooling medium in an outer annular space 3 and a refrigerant in the Inner tube 2 are guided in countercurrent. The mutual fixation between the outer and inner tubes is made using the spacing.

The profiling of the inner tube 2 consists of parallel to each other and coaxial grooves 4 and webs 5. » which have the same dimensions. The width b and depth t of the grooves 4 and webs 5 can differ in dimensions from 0.7 to 1 mm.

For higher heat transfer capacities that require higher refrigerant throughputs, three inner tubes 2 can be arranged offset from one another by an angle of 120 ° in a larger outer C) tube 1, as shown in cross section in FIG. 3.

Both in the simple embodiment according to FIGS. 1 and 2 and in the embodiment according to FIG. 3 for higher heat transfer capacities the outer tube 1 and the inner tube (s) 2 can be coiled together to form spirals, snakes or spirals the ends of which are provided with fittings for the fluid connections.

For use in systems that require additional separation between the refrigerant flowing inside and the refrigerant flowing outside.

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request the medium can, according to the exemplary embodiments in 4 and 5 on the inner tube 2 with a safety tube 6 be raised on the inside arranged grooves 7. The space formed by the grooves 7 is then placed in a fitting 8 brought together so that the refrigerant flowing out in the event of a leak to trigger an optical and / or acoustic Warning signal can be fed to a corresponding wading system.

From the performance diagram of FIG. 6 it can be seen that a Heat exchanger with a profile tube designed according to the invention is considerably more powerful than, for example, a heat exchanger with a known smooth tube or a known finned tube. The surprisingly large increase in performance is achieved due to the combination effect between the coaxial arrangement of the grooves and webs in the inner tube and one on the Dimensioning of the width and depth of the grooves and webs according to the diameter.

All mentioned in the description and shown in the drawings New features are essential to the invention, even if they are not expressly claimed in the claims are.

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List of prefixes:

1 Outer tube 2 Inner tube Annulus if Groove 5 web 6th Safety pipe 7th Grooves 8th Fitting 9 Spacer groove b broad t depth

Claims (4)

PATENTANWÄLTE ~ ^ j ·. "; ■■ ·" ": · piPü.-fNG. ALEX STENGER D-4ooo DÜSSELDORF ι '··'" ■ · '"· ■' ■. · *: Dip £. '.' ING. WOLFRAM WATZKE MaBcaStenstrasse2 DIPL.-ING. HEINZ J. RING Our reference 20,000 Date: May 2, 1979 R. & G. Schmöle Metallwerke GmbH & CO.KG, Fröndenberger Str. 29, 5750 Menden 1 Claims 1. V7 heat exchanger with an outer pipe and at least one inner pipe, which is provided on its inside with mutually parallel grooves that are separated from each other by webs are separated characterized in that the grooves (4) and the webs (5) in the inner tube (2) are coaxial extend and have the same dimensions, the width (b) and depth (t) J, 7 to 1 mm. 2. Heat exchanger according to claim 1, characterized in _t that are arranged in a star shape offset from one another in the outer tube (1) has three inner tubes (2) by 120 °. 3. Heat exchanger according to claim 1 or claims 1 and 2, characterized in that a safety tube (6) with longitudinal grooves (7) is drawn onto the inner tube (2) is. 4. Heat exchanger according to claims 1 to 5, characterized in that that the cavities formed by the grooves (7) are combined with a fitting (8). Telephone (02 U) 3 « 05.1« · '· Address: ' Dabipiiest ' ι Poälschedckonto KBIn 227610