ES2576989T3 - Tubular device for the transit of a heat exchanger fluid particularly for heat exchangers, and a liquid / gas heat exchanger particularly for boilers, comprising a series of tubular devices - Google Patents

Abstract

A tubular device (10) for the transit of a heat exchange fluid, particularly for heat exchangers, comprising a tube (11) having a series of tube portions (11a, 11b, 11c, 11d) each with a cross section having a profile that is formed by a plurality of lobes arranged in a substantially radial direction, each lobe defining a heat exchange channel (20, 21, 22) of said tube portion (11a, 11b, 11c, 11d), the cross sections (12, 12a) of two successive tube portions (11a, 11b, 11c, 11d) being rotated relative to each other relative to the axis of the tube by a certain angle, and the tubular device (10 ) comprising a tube redirection element of the removable rod type (16) inserted in the axial space between mixing portions (17, 18, 19) between two successive lobes of the cross section of each tube portion (11a, 11b, 11c , 11d), and designated to redirect the flow of heat exchange fluid introduced in said tube (11) laterally to the heat exchange channels (20, 21, 22) of the tube portions (11a, 11b, 11c, 11d).

Description

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Tubular device for the transit of a heat exchanger fluid particularly for heat exchangers, and a liquid / gas heat exchanger particularly for boilers, comprising a series of tubular devices.

The present invention refers to a tubular device for the transit of a heat exchanger fluid particularly for heat exchangers. The invention also relates to a liquid / gas heat exchanger, particularly for boilers, comprising a series of such tubular devices.

Currently, liquid / gas heat exchangers, particularly for boilers, with excellent performance are known and widely disseminated and meet with great satisfaction from installers. Such boilers comprise a passage chamber for a first heat exchange fluid, crossed by passage ducts for a second heat exchanger fluid, whose particularity lies in the fact that at least part of such conduits is provided with a plurality of tubes, each of which has a cross section with a profile that is formed by a plurality of lobes arranged in a substantially radial direction.

The particular shape of such tubes makes it possible to considerably increase the turbulence of the gas that has to cross them, compared to tubes with a circular or lenticular cross section.

However, such tubes with a lobular cross section can be improved.

Of course, as far as the mixing zones between two successive lobes of a tube are close to the axis of the tube, around such an axis a channel always remains from which the hot gas escapes without having optimally cleaned around the internal surfaces of the channels. with a lobular cross section of the tube, and thus having produced substantially very little of the heat it possesses.

In addition, such known tubes, precisely because they have a cross-section that is very narrow in the center, are difficult to clean and relatively prone to jams.

US 2008/0029243 A1 shows such tubes with a lobular cross section that is very narrow in the center.

A heat exchange tube for a heat exchanger is known from US 2 445 471. The tube has a pleated surface and is provided inside of a core that forces the gas or fluid passing through the tube into projecting interstices. out radially formed by the pleated outer wall of the tube.

US 2 445 471 shows a tubular device for the transit of a heat exchange fluid, particularly for heat exchangers, comprising a tube having at least a portion of its cross section with a profile that is formed by a plurality of lobes arranged in a substantially radial direction, such that it comprises a disposable rod flow redirection element inserted in the axial space between the mixing portions between two successive lobes, and designed to laterally redirect the heat exchange fluid flow introduced into said tube towards the heat exchange channels of said tube having a lobular cross section.

A tube with a star cross section, formed by longitudinal spiral ribs, is known from DE 11 29 516. A core is provided in the tube which can have a catalytic function.

The objective of the present invention is to provide a tubular device for the transit of a heat exchange fluid, particularly for heat exchangers, which is capable of overcoming the inconveniences of tubes with a lobular cross-section of the known type.

Within this objective, an object of the invention is to provide a liquid / gas heat exchanger, particularly for boilers, provided with a plurality of tubular devices.

Another object of the invention is to provide a tubular device in which the gas that crosses it is subjected to turbulence that improves heat exchange compared to what can be achieved with tubes of the known type.

Another object of the invention is to provide a tubular device that is easy to clean.

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Another object of the invention is to design a higher-performance liquid / gas heat exchanger than similar exchangers of the known type.

Another object of the invention is to provide a tubular device for the transit of a heat exchange fluid, particularly for heat exchangers, and a liquid / gas heat exchanger, particularly for boilers, comprising a series of such tubular devices, structurally simple and easy to use, which can be done using known systems and technologies.

This objective as well as these and other objects that would be apparent better in the following are achieved by a tubular device for the transit of a heat exchange fluid, particularly for heat exchangers, according to the invention, which has the characteristics established in the claim 1.

Advantageously, a liquid / gas heat exchanger, particularly for boilers, comprises a passage chamber for a first heat exchange fluid and passageways for a second heat exchange fluid, said passage chamber being crossed by said conduits. of passage, and is characterized by the fact that at least part of said passage ducts are formed by a plurality of tubular devices according to the invention.

Other features and advantages of the invention will be apparent better from the following detailed description of three preferred but not exclusive embodiments of the tubular device for the transit of a heat exchange fluid, particularly for heat exchangers according to the invention. , as well as a liquid / gas heat exchanger provided with a plurality of said tubular devices, illustrated by a non-limiting example in the accompanying drawings, in which:

- Figure 1 is a perspective view of a tube of the tubular device according to the invention in a first embodiment thereof;

- Figure 2 is a longitudinal sectional view of the tubular device according to the invention of Figure 1;

- Figure 3 is a cross-sectional view taken along the line III-III of Figure 2, of the tubular device according to the invention in its first embodiment;

- Figure 4 is a cross-sectional view taken along line IV-IV of Figure 2, of the tubular device according to the invention in its first embodiment;

- Figure 5 is a cross-sectional view taken along the line V-V of Figure 2, of the tubular device according to the invention in its first embodiment;

- Figure 6 is a view of a tubular device;

-Figure 7 is a view of another tubular device;

- Figure 8 is a side sectional view of a heat exchanger according to the invention, provided with tubular devices according to the invention;

- Figure 9 is a cross-sectional view of the exchanger according to the invention taken along the line IX-IX of Figure 8.

The embodiments of Figures 6-7 are not covered by the presently claimed invention. They are examples of possible tube configurations that are useful for understanding the invention.

A tubular device for the transit of a heat exchange fluid, particularly for heat exchangers according to the invention, is shown in a first example of its embodiment in Figures 1 to 5, and is designated therein by the reference number 10.

The tubular device 10 is of the type comprising a tube 11 having a series of tube portions 11a, 11b and following, each of which in cross section 12 (Figure 4) has a profile that is formed by three lobes 13, 14 and 15 arranged in a substantially radial direction.

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The tubular device 10 according to the invention comprises a flow redirection element of the disposable rod type 16 inserted in the axial space between the mixing zones 17, 18 and 19 between two successive lobes.

The rod type element 16 is designed to laterally redirect the flow of heat exchange fluid introduced into the tube 11 towards the heat exchange channels 20, 21, 22 of the same tube portion 11a, 11b, 11c and following of the tube 11 having a lobular cross section.

The portions 11a, 11b and following are made in such a way that the cross sections of two successive tube portions 11a, 11b and following are rotated with respect to the axis of the tube 11 by a certain angle, for example 60 ° as shown in the cross section 12a in figure 5, of the tube portion 11b and with respect to the cross section 12 in figure 4 of the tube portion 11a.

The rod-type redirection element 16 has a profiled grip end 23, clearly visible in Figure 2, for the removal of the rod-type element 16 from the tube 11 to clean the tube 11.

In such a first embodiment of the tubular device 10 according to the invention described so far, the tube 11 has a cross section comprising three lobes 13, 14 and 15 arranged substantially at 120 ° sexagesimal relative to each other.

It should be appreciated that the lobes in alternative embodiments may also be different in number.

In such a first embodiment of the tubular device 10 according to the invention described so far by non-limiting example of the invention, the tube 11 has a rectilinear longitudinal extension, and the portions 11a, 11b and following with a cross section 12 comprising three lobes alternated with portions 11e, 11f and following with a cross section that is substantially circular as can be seen in Figures 1 and 2.

In a second embodiment that is not part of the invention, schematically shown in Figure 6, the tubular device according to the invention, indicated therein with reference number 110, comprises a tube 111 with a cross section comprising three lobes, with continuous straight longitudinal extension, without portions having a circular cross section.

The corresponding rod type element 116 with the profiled grip end 123 is schematically shown inside the tube 111.

In a third example of embodiment of the tubular device not according to the invention, indicated in Figure 7 with the reference number 210, the tube 211 has a helical longitudinal extension.

The tube 11, as well as 111 and 211, have end portions 24 and 25 that are substantially cylindrical and therefore relatively easy to be welded.

Figure 3 shows a cross section 12b of a first end 24.

The tube 11, 111, 211 can be easily obtained by processing which includes the pressing of a tube of

metal.

The rod type element 16 and 116 can be obtained from a metal bar.

The invention also refers to a liquid / gas heat exchanger, designated in Figures 8 and 9 with the reference number 30.

The exchanger 30, particularly for boilers for example fed by diesel fuel or by cogeneration, comprises a passage chamber 35 for a first heat exchange fluid, crossed by passage ducts 32 for a second heat exchange fluid.

Part of such ducts is provided by a plurality of tubular devices 10 or 110 or 210 as described above.

The exchanger 30 comprises a main external body 33 containing an inlet chamber for gas 34, which forms, together with the main body 33, the passage chamber 35 for a first heat exchange fluid.

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The gas inlet chamber 34 is surrounded by a series of heat exchange ducts 36, circular in cross section, and by a series of tubular devices 10.

The two series of ducts are arranged in two concentric circumferences.

The gas is transported from the inlet chamber 34 to the ducts 36 with circular cross-section through a first redirection and exchange bottom 37.

The same gas leaving the conduits 36 with circular cross-section is transported to the tubular devices 10 by means of an annular chamber 38 that surrounds the entrance of the gas inlet chamber 34.

The exchanger 30 is closed in an upper region by a flange 39 with a hole for the passage of gas, and in a lower region by a second condensation collection bottom 40 with an inlet 41 for a flue.

At least one of the flanges 39 and the second bottom 40 is designed to be removed by removing the rod-type redirection elements 16 from the tubular devices 10 to clean their tubes 11.

In practice it has been discovered that the invention fully achieves the objective and the intended objects.

In particular, with the invention a tubular device has been provided in which the gas that crosses it is subjected to turbulence that improves heat exchange compared to what can be achieved with tubes of the known type, and consequently a design has been designed. liquid / gas heat exchanger, particularly for boilers, provided with a plurality of tubular devices in terms of the object of the invention, of improved performance compared to similar exchangers of the known type.

Furthermore, as a result of the presence of the removable rod type element 16, a tubular device has been provided that is easy to clean, since it is sufficient to remove the rod type element 16 in order to have sufficient space inside the tube 11 to maneuver a cleaning instrument.

Furthermore, with the invention a liquid / gas heat exchanger has been designed that has a higher performance than similar exchangers of the known type.

Furthermore, with the invention a tubular device for the transit of a heat exchange fluid, particularly for heat exchangers, and a liquid / gas heat exchanger, particularly for boilers, comprising a series of such tubular devices, have been designed, which are structurally simple, easy to use and can be made using known systems and technologies.

In practice, the materials used, as well as the dimensions and contingent forms can be any according to the requirements and the state of the art.

Where the technical elements mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs have no limiting effect on the interpretation. of each element identified by example by such reference signs.

Claims (8)

5 10 fifteen twenty 25 30 35 40 1. A tubular device (10) for the transit of a heat exchange fluid, particularly for heat exchangers, comprising a tube (11) having a series of tube portions (11a, 11b, 11c, 11d) each one with a cross section having a profile that is formed by a plurality of lobes arranged in a substantially radial direction, each lobe defining a heat exchange channel (20, 21, 22) of said tube portion (11a, 11b, 11c, 11d), the cross sections (12, 12a) of two successive tube portions (11a, llb, 11c, 11d) being rotated relative to each other relative to the axis of the tube by a certain angle, and the tubular device (10) comprising a tube redirection element of the disposable rod type (16) inserted in the axial space between mixing portions (17, 18, 19) between two successive lobes of the cross section of each tube portion (11a, 11b, 11c, 11d), and designed to laterally redirect the flow of heat exchange fluid introduced into said tube (11) towards the heat exchange channels (20, 21, 22) of the tube portions (11a, 11b, llc, 11d). 2. The device according to claim 1, characterized in that said rod-type redirection element (16) has at least one profiled grip end (23) for the extraction of said tube (11). The device according to the preceding claims, characterized in that said tube portions (11a, 11b, 11c, 11d) each have a cross section comprising three lobes (13, 14, 15) arranged substantially at 120 ° sexagesimal each other. The device according to the preceding claims, characterized in that said tube (111) has a rectilinear longitudinal extension. The device according to the preceding claims 2, 3 and 4, characterized in that said tube portions (11a 11b, 11c, 11d) alternate with other tube portions (11e, 11f, 11g) having a cross section which is substantially circular. 6. A liquid / gas heat exchanger (30), particularly for boilers, comprising a passage chamber (35) for a first heat exchange fluid and passageways (32) for a second heat exchange fluid , said passage chamber (35) being crossed by said passage conduits (32), characterized in that at least part of said passage conduits (32) are formed by a plurality of tubular devices (10) as set forth in any of claims 1-5. 7. The heat exchanger according to claim 6, characterized in that it comprises a main external body (33) containing an inlet chamber (34) for said second heat exchange fluid being gas, which forms, together with said main body (33), said passage chamber (35) for a first heat exchange fluid, said inlet chamber (34) for the gas being surrounded by said passage ducts (32) which are formed by a series of heat exchange ducts (36) having a circular cross section and by a series of said tubular devices (10), the gas being transported from said inlet chamber (34) to said heat exchange ducts (36) having a circular cross section by means of a first redirection and exchange bottom (37), said gas leaving said heat exchange ducts (36) having a circular cross section being transported to the tubular devices it is (10) by means of an annular chamber (38) surrounding the inlet of said inlet chamber for the gas (34). 8. The heat exchanger according to claim 7, characterized in that it is closed in an upper region by a flange (39) with a hole for the passage of gas and in a lower region by a second condensation collection bottom (40) with an inlet (41) for a flue, at least one of said tabs (39) and said bottom (40) being designated to be removed for the removal of the rod-type redirection elements (16) from the devices tubular (10) to clean your tube.