JPS6127678B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a wire forms a long helix, and the long helix is further spirally wound on a support tube, and each winding portion of the helix is arranged in the axial direction of the support tube. The adjacent helical bodies on the support tube are arranged such that their respective windings partially engage each other in the axial direction of the support tube, and the adjacent helical bodies extend toward each other in the axial direction of the support tube. The heat exchanger is supported by wires wound around the support plate at the same pitch as the winding pitch of the helical body.

Similar previously known heat exchangers, such as U.S. Pat.
In the heat exchanger known from No. 877252, the wire turns of the helix have the shape of an isosceles triangle with rounded corners and narrow apex angles pointing outwards. Partially interengaging sides formed by the isosceles portions of adjacent turns define an outwardly spiral groove into which a wire is mounted and which wire is inserted into the helix. The windings of the wire are protected against displacement and deformation due to the action of external forces.

However, in order to expose as much of the surface as possible to the medium to be heated or cooled, a portion of the helical wire winding made of fairly thin wire protrudes from the support wire, and such protrusion is External heat exchangers are extremely sensitive to external influences and easily damaged, and experience has shown that this must be avoided during the manufacture of such heat exchangers, especially during storage, transportation to the point of use, and installation. There isn't.

This also applies when the support wire is placed in the groove formed by the helical wire, only a slight pretension is provided and the support wire is not fixed to the helical wire. applies even more to As a result, even slight displacement or deformation of a relatively small portion of the helical wire winding causes the support wire to lose its pretension and frictional engagement force with the helical wire winding, thereby achieving the function provided. It becomes impossible to fulfill the purpose.

A further advantage of the above-mentioned known heat exchangers in comparison with heat exchangers of the type with helical windings arranged in parallel and wire windings arranged closely one behind the other on the support tube. Another problematic drawback is that only about half the number of helical wire turns can be arranged around the support tube due to the mutual engagement of the helical turns.

The losses of the heat exchange surface caused by this can be reduced by increasing the number of helical turns that can be arranged for a given length of the support tube, which can be achieved by the mutual shape of the helical turns. Even if they do, they can hardly compensate.

Finally, the triangular shape of the wire windings, chosen in order to enable a winding process that can obviously be carried out easily and continuously, is also disadvantageous for heat exchange. This is because these windings only present an outwardly decreasing surface for the thermally acted upon medium, and the temperature difference between these surface areas and the surrounding medium increases. This is because the distance from the support tube, where the amount of medium subjected to thermal action is greater, is smaller.

In contrast, the object of the invention is, on the one hand, to significantly increase the effective wire surface and to make the temperature gradient conditions in the helix even more favorable in a heat exchange of the kind mentioned at the outset, and, on the other hand, to ensure that the wire helix The objective is to satisfy the conditions necessary to eliminate unavoidable inconveniences in manufacturing, storage, transportation, installation, and use.

According to the present invention, the outer part of the spiral wire winding part parallel to the axis lies within a cylindrical surface concentric with the axis of the support tube, and the support wire is adjacent to the winding part of the spiral wire. Adjacent helical turns at least engage each other so as to interconnect all axis-parallel portions of the helix, and the support wire is wound around the outer periphery of the helix and secured thereto. This is achieved by ensuring that

The support wires, arranged and secured as described above, ensure that all the wires of the helix are held in their radial alignment, while also keeping all the wire windings relative to each other in the direction of the axis of the helix. To support. The support wire forms a closed cylindrical lattice with its outer helical wire corners, which resists the effects of any external forces that may be expected when the lattice is in use.

The helical wire turns can be elongated rectangular in shape, or can be trapezoidal in shape, tapering outwardly or widening, but with an apex that conducts heat to the support tube. It can also have the shape of a fixed isosceles triangle. By selecting the shape of the winding, the size of the heat exchange surface, the state of the temperature gradient and the winding process can be varied within a relatively large range.

For winding helices with rectangular or ladder-shaped wire windings that are slightly tapered in one direction, the axial An auxiliary device is required to effect the mutual displacement, but the helix can be formed into a ladder shape that is greatly expanded outwards or, depending on the purpose, into a triangular turn whose slightly flattened apex rests on the support tube. It can thus be wound in its final position onto the support tube without the aids mentioned above.

The helix having the shape of the last-mentioned wire turns is furthermore such that as the temperature difference to the thermally acted upon medium decreases outwardly, the surface exposed to the medium becomes larger and larger. It has the most favorable temperature gradient as long as it exists.

Embodiments of the heat exchanger of the present invention shown in the accompanying drawings will be described below.

The illustrated heat exchanger basically consists of a conduit 1 for a flowable heat carrier whose temperature can be brought below or above the temperature of the thermally acted upon medium surrounding the heat exchanger. It consists of a wire helix 2 spirally wound around the tube as a heat sink, and a reinforcing or supporting wire or head wire 3 wound around the outer periphery of the wire helix.

All wire windings are brazed or welded in a known manner onto the support tube 1 so as to have a cross-sectional area at least twice that of the helical wire for heat conduction from the tube wall towards the wire windings. It is fixed in such a way that a corresponding metal joint surface is obtained. Each head wire or support wire 3 is also firmly connected to the intersecting turns of the helical wire, the strength of the connection being more important than its thermal conductivity.

As can be seen from FIG. 1, the turns of the wire forming the turns of the helix 2 are attached to the wall of the support tube 1 with a distance between adjacent turns at least equal to the diameter of the wire. It will be done. This results in a continuous arrangement of the next helical wire winding row between these wire winding rows, with each one already installed helical wire of the previous row. It is then possible to push in the wire windings of the next helical row, which is subsequently installed next to it, in the axial direction. To this end, certain auxiliary equipment is utilized which is not the subject of the present invention. In this way, the support tube 1 of the spiral wire winding portions 2a, 2a' as seen in FIGS.
The above arrangement is obtained. In this case, a substantially elongated rectangular helical wire winding 2a or 2
Adjacent helices of a' are engaged with each other such that they overlap by approximately one-third of the axial width of the wire turns. The portions of the wire windings of adjacent spirals which are arranged in parallel and in contact with each other in the circumferential direction are connected to a support wire or head wire 3 which is wound on the outer periphery of the spiral and fixed to all the wire windings. It is thus held in such a way that it cannot be displaced either tangentially or axially with respect to the support tube 1 from a given position.

The outer portions of the helical wire turns form a stable tubular lattice with the support wire, a partially exploded view of which lattice is shown in FIG.

In this case, in the embodiment according to FIG. 2 the supporting wire 3 rests on the outer corner of the wire winding, whereas in the embodiment according to FIG.
The outer circumferential diameter of the wire turns 2a' is reduced so that the oblique outer corners of the wire windings 2a' of adjacent helical bodies lie in a helical groove formed by each other.

In the embodiment according to FIG. 4, the wire helix is rounded or slightly flattened so that its apex abuts the support tube 1, so that only the outer part fits between the wire turns of the adjacent helix. It consists of isosceles triangular wire windings 2a'' with acute apex angles.A helix of the type described above, with windings whose outer regions engage each other, is formed by the respective attached windings during winding. The outer shape of the wire helix fixed by the support wire 3 is also shown in FIG. It corresponds to what is shown.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment in which a spirally wound portion of a heat exchanger according to the present invention goes around a support tube. FIG. 2 is a longitudinal section through a section of a heat exchanger according to the invention having an elongated rectangular helical winding; FIG. 3 is a sectional view showing the deformation of the heat exchange portion similar to FIG. 2. FIG. 4 is a longitudinal cross-sectional view of a portion of a heat exchanger according to the invention having a helical wire turn of triangular outwardly expanding shape; Figure 5 shows the second
FIG. 5 is a plan view of a portion of the developed outer peripheral surface of the embodiment according to FIG. 3 or 4; 1...Support tube, 2...Wire helix, 3...Head wire.

Claims (1)

[Claims] 1. A long spiral is formed with a wire, and the long spiral is further spirally wound on a support tube, and each winding portion of the spiral expands in the axial direction of the support tube. Adjacent helices on the support tube are arranged such that their respective turns partially engage each other in the axial direction of the support tube, and the adjacent helices mutually extend into each other in the axial direction of the support tube. The heat exchanger is configured to be supported by a wire wound around the support tube at the same pitch as the winding pitch of the spiral body, the winding portion of the spiral body being
The outer portions of Za, 2a', 2a'' parallel to these axes lie within a cylindrical surface concentric with the support tube 1, and the head wire 3 connects all the portions parallel to the axes of the adjacent helical bodies 2 to each other. The winding portions 2a, 2a',
A heat exchanger characterized in that the winding diameter of the head wire 3 is made slightly smaller than the outer diameter of the helical body so that the wire winding of the adjacent helical body 2 is fixed to the partially engaged portion of the helical body 2 The heat exchanger according to claim 1, characterized in that the heat exchanger is located in a groove formed by an obliquely shaped outer corner of the portion 2a'.3. 3. The heat exchanger according to claim 1 or 2, wherein the second wire winding 2a'' has an isosceles triangular or trapezoidal shape expanding outward from the support tube 1. .