CA1148932A - Conduit device - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A device for conducting a fluid in heat transfer rela-tionship with another liquid comprises a conduit through which the fluid flows to be heated or cooled by the other fluid flowing around the conduit. An elongated, thread like element helically extends around the conduit with the windings spaced from each other, causing the fluid flowing around the conduit to undergo circulation for improved heat transfer relationship.

Description

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The present invention relates to a device for conducting a fluid, for example liquid state Freon (a trademark), com-pxising a conduit through which the fluid is passed to be heated or cooled by a medium flowing around the conduit.
Devices of this type are used for example in heating systems for pre-heating a heat carrier liquid.

The present invention provides a device of the type des-cribed above, in which the heat transmission between the fluid which is passed through the conduit and the medium flowing around the conduit is better than in the conventional devices.

According to the present invention there is provided a device for conducting a first fluid in heat transfer rela-tionship with a second fluid, comprising a plurality of con-duits each containing the first fluid; an outer pipe carrying the conduits and containing a second fluid flowing around the conduits; and a thread shaped element helically wrapped sub-stantially around each of the conduits with the element wind-ings around each conduit longitudinally spaced from each other to cause the second fluid flowing around the conduit to per-form 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 ; 25 apart from said outer pipe along a common longitudinal plane extending radially through the conduit, enabling fluid to flow therebetween, said conduits being substantially parallel to the longitudinal axis of said outer pipe and spaced apart from each other radially toward the outer pipe by means of the helically extending elements wherein said windings of each element are offset axially relative to corresponding windings provided on an adjacent conduit, said windings on oneconduit thereby contacting an adjacent conduit to radially space adjacent conduits from each other in the outer pipe a distance substantially equal to the diameter of an element interposed therebetween, said windings defining a continuous clearance between adjacent conduits extending substantially , , - . ,.
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, the entire axial length of said elements, enabling second fluid flow between adjacent conduits through the continuous clearance.

Thus according to the present invention a longitudinal thread shaped element is helically positioned around the conduit with the windings spaced from each other in order to cause the medium flowing around the conduit to perform a circulating motion around the conduit.
In a preferred embodiment of the invention the device comprises a plurality of conduits each provided with a heli-cally extending element, said conduits being positioned to-~ - la -, ,.

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gether in substantially parallel and spaced apart relation-ship with each other ~ means of the helically extending elements enabling the second fluid to circulate between the conduits.
It is desirable 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 `~
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~8~32 pOSitioned therein extend helically.

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.
Because the flowing medium is caused to effect a circulating motion and the heat transmission to the conduits is thereby improvided it is possible to reduce the dimensions of the device.
An embodiment of the invention is described in the fOllowing with reference to the accompanying drawing.

Fig. la i8 a side view of a device according to the invention;
Fig.,lb is a section on an enlarged scale showing a portion of the device according to Fig. la;

Fig. lc is a section on an enlarged scale showing another portion of the device according to Fig. la; and Fig. 2 shows two conduits forming a part of the device according tothe invention.

A Freon (a trade mark) liquid is fed in the direction of the arrow 13 through an expansion valve 7 and a distribu-tion head 8 to pipes 5 and conduits 3 connected therewith as shown in Figure 1. A helically extending element 4, tFigure 2~, 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 .

8~332 common into a wider outer pipe 2 (Figure lb) preferably consisting of polyethylene formed in the shape of 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 11 for a medium, preferably water, which is supp:Lied to the outer pipe 2 at the upper end thereof. In-s:ide the pipe section 15 the pipes 5 extend through a sealed end portion 6 and into the conduits 3.

The upper end of the helix 1 is connected with a pipe section 9 by means of a hose clamp 14, the pipe section 9 having an inlet 12 for a hot medium, preferably water, and an outlet 10 for the heated Freon liquid, the pipes 3 being fixed and spaced apart from each other by means of a sealed end portion 6 as shown in Figure lb.

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Claims (4)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A device for conducting a first fluid in heat trans-fer relationship with a second fluid, comprising a plurality of conduits each containing the first fluid; an outer pipe carrying the conduits and containing a second fluid flowing around the conduits; and a thread shaped element 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 con-tinuous contact with the conduit, said element being at least partially spaced apart from said outer pipe along a common longitudinal plane extending radially through the con-duit, enabling fluid to flow therebetween, said conduits being substantially parallel to the longitudinal axis of said outer pipe and spaced apart from each other radially toward the outer pipe by means of the helically extending elements where-in said windings of each element are offset axially relative to 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 a distance substantially equal to the dia-meter of an element interposed therebetween, said windings defining a continuous clearance between adjacent conduits extending substantially the entire axial length of said ele-ments, enabling second fluid flow between adjacent conduits through the continuous clearance.

2. A device as claimed in claim 1, wherein said outer pipe and conduits are arranged as a helix.

3. A device as claimed in claim 1 or 2, wherein each element is entirely spaced away from the conduit carrying means.

4. A device according to claim 1, further including means for spacing said conduits apart from each other and the conduit carrying means.