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(11) | EP 0 062 729 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
A conduit device Vorrichtung mit Rohren Dispositif de tuyauterie |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The present invention relates to a device for conducting a fluid, for example liquid state freon or another liquid, comprising a conduit through which the fluid is conducted in order to be heated or cooled by means of a medium flowing around the conduit.
[0002] A device of this kind is disclosed in DE-A-1501573. This comprises a conduit around which a thread has been coiled with spaced windings.
[0003] Another prior art device is disclosed in Patent Abstracts of Japan, Volume 4, No. 29, 14.3.80, page 19 M 2. This comprises a group of heat transfer tubes around which wires are wound helically.
[0004] A further known device is disclosed in DE-U--7818067. This comprises three heat transfer tubes placed in an outer tube. The inner tubes are provided with ridges which extend as rings around the tube.
[0005] The object of the invention is to provide a device of the kind described above, in which the heat transmission between the fluid which is conducted through the conduit and the medium flowing around the conduit is better than in the devices previously known. At the same time flow losses should be kept low.
[0006] The invention as claimed complies with the object of the invention by providing each heat transfer conduit with a helically extending element such that the conduits are spaced radially a distance substantially equal to the diameter of the helically extending element, whereby a low loss flow is enabled between the conduits.
[0007] It is suitable that the conduits positioned together in parallel with each other are provided in an outer pipe, through which the flowing medium is conducted, and that said outer pipe and the conduits positioned therein extend helically.
[0008] By means of the device according to the invention there is provided a more effective heat transmission between the outer side of the conduit and the medium flowing around the conduit. The conduits can be positioned close to each other inside the outer pipe without causing the outer surfaces of the conduits to contact each other and thereby to obstruct the flowing of the medium outside the conduits.
[0009] Because of the fact that the flowing medium is brought to perform a circulating motion and the heat transmission to the conduits is thereby improved it is possible to reduce the dimensions of the device.
[0010] An embodiment of the invention is described in the following with reference to the accompanying drawing.
Fig. 1a is a side view of a device according to the invention.
Fig. 1b is a section on an enlarged scale showing a portion of the device according to Fig. 1 a.
Fig. 1c is a section on an enlarged scale showing another portion of the device according to Fig. 1 a.
Fig. 2 shows two conduits forming a part of the device according to the invention.
[0011] Afreon liquid is fed in the direction of the arrow 13 through an expansion valve 7 and a distribution head 8 to pipes 5 and conduits 3 connected therewith. A helically extending element 4, preferably consisting of copper wire, extends around each of the conduits 3. The windings of the elements 4 are spaced from each other. The conduits 3 extend in common into a wider outer pipe 2 preferably consisting of polyethylene and extending as a helix 1. The lower end of the helix 1 is connected with a pipe section 15, by means of a hose clamp 14, the pipe section 15 having an outlet 10 for a medium, preferably water, which is supplied to the outer pipe 2 at the upper end thereof. Inside the pipe section 15 the pipes 5 extend through a sealed end portion 6 and into the conduits 3.
1. A device for conducting a first fluid in heat transfer relationship with a second
fluid, comprising a plurality of conduits (5) each containing the first fluid; an
outer pipe (2) carrying the conduits (5) and containing the second fluid flowing around
the conduits; and a thread shaped element (4) helically wrapped substantially around
each of the conduits with the element windings around each conduit longitudinally
spaced from each other to cause the second fluid flowing around the conduit to perform
a circulating motion, said element having substantially an entire length and a surface
thereof in continuous contact with the conduit, said element being at least partially
spaced apart from the outer pipe along a common longitudinal plane extending radially
through the conduit, enabling fluid to flow therebetween and said conduits being substantially
parallel to the longitudinal axis of the outer pipe and spaced apart from each other
radially toward the outer pipe by means of the helically extending elements, characterized
in that the windings of each element (4) are offset axially relative to the corresponding
windings provided on an adjacent conduit, said windings on one conduit thereby contacting
an adjacent conduit to radially space adjacent conduits from each other in the outer
pipe (2) a distance substantially equal to the diameter of an element interposed therebetween,
said windings defining a continuous clearance between adjacent conduits extending
substantially the entire axial length of said elements, enabling second fluid flow
between adjacent conduits through the continuous clearance.
2. A device as claimed in claim 1, characterized in that the outer pipe (2) and the
conduits (5) are arranged as a helix (1).
1. Vorrichtung zur Führung einer ersten Flüssigkeit in Wärmeaustausch-Beziehung zu
einer zweiten Flüssigkeit, bestehend aus einer Anzahl von Leitungsrohren (5), deren
jedes die erste Flüssigkeit enthält, einem die Rohrleitungen tragenden und die um
die Rohrleitungen herumfließende zweite Flüssigkeit enthaltenden Außenrohr (2) und
einem im wesentlichen um jede der Rohrleitungen schraubenförmig herumgewundenen fadenförmigen
Element (4), dessen Windungen um jede Rohrleitung in Längsrichtung voneinander entfernt
liegen, sodaß die um die Rohrleitung herumfließende zweite Flüssigkeit eine Umlaufbewegung
vollführt, wobei dieses Element im wesentlichen über seine gesamte Länge und mit einer
Seite ständig mit der Rohrleitung in Berührung steht, wobei dieses Element wenigstens
teilweise vom Außenrohr längs einer gemeinsamen Längsebene entfernt ist, welche radial
durch die Rohrleitung hindurchgeht, wodurch Flüssigkeit dazwischen fließen kann, und
wobei die Rohrleitungen im wesentlichen parallel zur Längsachse des Außenrohres verlaufen
und in radialer Richtung zum Außenrohr durch die schraubenförmig verlaufenden Elemente
im Abstand voneinander gehalten werden, dadurch gekennzeichnet, daß die Windungen
eines jeden Elementes (4) in axialer Richtung gegenüber den entsprechenden Windungen
auf einer benachbarten Rohrleitung versetzt sind, wodurch die Windungen auf einer
Rohrleitung an einer benachbarten Rohrleitung anliegen und dadurch benachbarte Rohrleitungen
im Außenrohr um einen Abstand voneinander trennen, der im wesentlichen gleich dem
Durchmesser eines zwischenliegenden Elementes ist, sodaß diese Windungen einen sich
im wesentlichen über die gesamte Länge der Elemente erstreckenden durchgehenden Spielraum
zwischen benachbarten Rohrleitungen begrenzen und die zweite Flüssigkeit zwischen
benachbarten Rohrleitungen durch diesen durchgehenden Spielraum hindurchleitbar ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Außenrohr (2) und
die Rohrleitungen (5) eine Spirale (1) bilden.
1. Dispositif pour faire passer un premier fluide suivant un échange de chaleur avec
un second fluide, comportant un ensemble de conduites (5) chacune contenant le premier
fluide et une conduite extérieure (2) recevant les conduites (5) et contenant le second
fluide qui s'écoule autour des conduites ainsi qu'un élément (4) en forme de filet,
qui est enroulé hélicoïdalement pratiquement autour de chacune des conduites (5),
les spires de l'élément autour de chaque conduite étant espacées longitudinalement
l'une de l'autre pour que le second fluide s'écoule autour de la conduite suivant
un mouvement de circulation, l'élément ayant essentiellement toute une longueur et
la surface correspondante en contact continu avec la conduite, cet élément étant au
moins partiellement espacé de la conduite extérieure suivant un plan longitudinal
commun s'étendant radialement par la tuyauterie, permettant au fluide de passer dans
l'intervalle et les tuyauteries étant essentiellement parallèles à l'axe longitudinal
de la conduite extérieure en étant espacées l'une de l'autre radialement en direction
de la conduite extérieure par l'intermédiaire des éléments disposés en hélice, caractérisé
en ce que les spires de chaque élément (4) sont décalées axialement par rapport aux
spires correspondantes prévues sur la conduite adjacente, les enroulements sur une
tuyauterie touchant ainsi une tuyauterie adjacente pour écarter radialement les tuyauteries
adjacentes, l'une par rapport à l'autre dans la conduite extérieure (2), d'une distance
essentiellement égale au diamètre d'un élément placé entre ces tuyauteries, les enroulements
définissant un jeu continu entre les conduites adjacentes et s'étendant essentiellement
sur toute la longueur axiale des éléments, en autorisant le second fluide à passer
entre les conduites adjacentes à travers l'intervalle continu.
2. Dispositif selon la revendication 1, caractérisé en ce que la conduite extérieure
(2) et les tuyauteries (5) sont disposées en hélice (1).