DE825847C - Pipe for heat exchanger - Google Patents

Description

Heat exchanger tube The present invention relates to the arrangement and special design of heat dissipation surfaces on pipes or Elements of heat exchangers for better heat transfer with low losses to allow and good flow of the one heat exchange medium around the tubes or to secure elements of the heat exchanger around.

Several exemplary embodiments are shown in the drawing.

Fig. I shows one with two opposing heat dissipation surfaces provided pipe; Fig. 2 shows a tube with two heat dissipation surfaces on the side of the pipe, which opposes the heat exchange medium flowing past the pipe is; Figures 3 to 5 show modifications of this embodiment; Fig. 6 is a plan from Fig. 5; Fig. 7 shows a modification of the embodiment according to Fig. 6; Fig. 8 and 9 show, in section, two other embodiments of the heat transfer surfaces; Fig. Io shows a cross section of a further embodiment, and Fig. Ii and 12 are longitudinal sections of two embodiments which correspond to Fig. Io.

In the case of a heat exchanger consisting of one of a heat exchange medium tube bundle through which it flows, which exchanges its heat with another heat exchange medium, that flows around the outside of the tube bundle, exchanges, it is already known to the Pipes attach fins or other heat dissipation surfaces to increase efficiency to improve the exchanger.

According to the present invention, the heat dissipation surfaces so designed and arranged that they increase the efficiency even more, in particular by changing the flow direction of the heat exchange medium which the tubes are outside washed around, steer in a suitable manner. .

In Fig. I a pipe a for a heat exchanger is shown, which has two heat dissipation surfaces b and c in the axis plane of the Tube and parallel to the external flow direction of the external heat exchange medium facing each other, flowing in the direction of arrow A.

In a first embodiment of the invention, the heat dissipation surface, which has the shape of longitudinal ribs c, doubled, as can be seen from Fig. 2, namely two ribs cl and c2 are provided at a lateral distance from one another. The ribs c1 and c can, as can be seen from the rib c2, extend from their base Holes d to be drilled through to the heat exchange means in the direction of the arrow A flows, to allow in the space between the ribs cl and c $ behind to enter the pipe a. The holes d can extend over the entire length of the two ribs be arranged offset.

Fig. 3 shows two ribs c'1 and c'2, which are inclined towards each other, are to create a kind of converging space behind the pipe a.

In the embodiment according to Fig. 4, the front rib b is also in two ribs b1 and b. divided, which are expediently inclined forward, so that the profile of all ribs b1, b $, c'1, c ', taken together, results in a fluidically favorable shape with respect to the heat exchange medium flowing past. The ribs may have holes or recesses d on their lower part, which may be offset in front and rear.

In the embodiment according to Fig.5, the heat dissipation surfaces are formed from a sheet metal that is welded lengthways onto the tube and cut at certain intervals in the transverse direction, so that individual sections are created which are bent inward so that they, as one from Fig. 5 and 6 recognizes, form a kind of blades ei and e2, which force the heat exchange medium, which flows in the direction of arrow A , into space B (Fig. 5), which is axially behind the pipe a.

The blades e1 and e can be straight and spaced in each section be arranged from each other, as can be seen from Fig. 7.

It can be seen that these heat dissipation surfaces also have any other arrangement and may have shapes favorable to the flow of the external heat exchange medium is viewed and having the best touch on all surfaces of the wings and pipes the heat exchange medium guaranteed.

Another embodiment is shown in fig. The rear heat dissipation surfaces f1 and f $ consist of tube halves which are bevelled along the line CD and welded at certain intervals onto the semi-cylindrical rear side of the tube a so that, as can be seen from the section in Fig. 9, they are initially convergent and then form divergent guidance on the one hand between the inner wall of the pipe half f1 and on the other hand the outer wall of the 1 pipe a. The heat exchange medium, which first flows against the tube a in the direction of arrow A and then in the direction of arrows F. inside the tube half f1 and f2, is then fed into the axial space B behind the tube.

The passage of the heat exchange medium through this convergent and divergent guidance helps to zone in the flow of the heat exchange medium form that have different pressure and exchange heat between the improve external and internal heat exchange media.

From Fig. 9 it can be seen that the ribs b1 and b2 in front of each other are approximated and also have recesses d, similar to the embodiment according to Fig. 4. These recesses d are spaced apart, and at the points where the rear pipe halves f1 and f2 are welded, in such a way, that the heat exchange medium, which is already collected between b1 and b2, freely exits while new heat exchange medium through the convergent-divergent Guides formed by the rear tube halves f1 and f2 were added will.

In the embodiment according to Fig. Io, the rear heat dissipation surfaces exist made of sheet metal strips that are bent in and on the rear half-cylinder parts of the Rohres represent a double convergent-divergent guide, whereby the above specified effects can be achieved. The neck of these guides is approximately less than 45 ° to the general direction of flow. These sheets g1, g $ can also be corrugated as can be seen from Fig. ii, where the part F, G is welded onto the tube -a is that a heat transfer of the sheet to the tube a is secured, with then convergent-divergent spaces H arise around the pipe.

In the embodiment according to Fig. 12, the heat dissipation surfaces formed from a non-corrugated sheet, which partitions i at certain intervals keeps each other and ensures the transfer of heat.

Of course, any changes can still be made to individual parts can be made without departing from the scope of the invention.

Claims (6)

PATENT CLAIMS: i. Tube for heat exchangers, characterized in that at least two heat dissipation surfaces are attached on the side which is opposite to the direction of flow of the heat exchange medium flowing past the tube. 2. Tube according to claim i, characterized in that the heat dissipation surfaces consist of there are two tangentially arranged longitudinal ribs (cl and c, or c'1 and c'2), which lie in parallel or in mutually inclined planes (Fig. 2 to 4). 3. Tube according to claims i and 2, characterized in that the longitudinal ribs have openings (d) at their base (Fig. 4). 4. Pipe according to claim i and 2, characterized in that the longitudinal ribs are cut open at certain intervals and are bent inwards in such a way that they have a shovel-like shape (e1 and e2) accept (Fig. 5 and 6). 5. Tube according to claim i, characterized in that the Heat dissipation surfaces consist of split tubes (f1 and f2) that are perpendicular to the longitudinal pipe axis and obliquely to the direction of flow of the pipe passing by Heat exchange means are welded on and the upper end is beveled (Fig. 8 and 9). 6. Tube according to claim i, characterized in that the heat dissipation surfaces consist of longitudinal sheets (g1 and g2) which first converge with respect to the pipe wall and then run diverging and either by means of partition walls (i) attached to the pipe or corrugated and welded directly to the pipe (Fig. Io to 12).