WO2010061263A1

WO2010061263A1 - Fin radiator made of mechanically connected aluminium section bars

Info

Publication number: WO2010061263A1
Application number: PCT/IB2009/007460
Authority: WO
Inventors: Stefano Ragaini
Original assignee: Rag-All S.P.A.
Priority date: 2008-11-28
Filing date: 2009-11-11
Publication date: 2010-06-03
Also published as: IT1392117B1; ITAN20080050A1

Abstract

The subject of the present invention is an aluminium section bar radiator (1) composed of two manifolds (2) and a series of uprights (3) connected hydraulically and mechanically to said manifolds (2) by sealing devices (4, 401, 2041, 204, 307; 4.b, 207, 305.b; 4, 204, 307.b) that can be disconnected from each other. It also provides a method for assembling the aluminium section bar radiator (1), by caulking at least one pair of fins (304. a; 304.b): said fins are built on each of said uprights (3) and penetrate into the grooves by means of plastic deformation (202) made on each side (208) of said manifolds (2).

Description

RADIATOR MADE OF MECHANICALLY CONNECTED ALUMINIUM SECTION BARS

D E S C RIPT I O N

The present invention regards space heat radiators whose elements are obtained by extruding suitable alloys, preferably aluminium ones.

Specifically, this invention describes the means and methods for mechanically and hydraulically connecting the vertical elements of said radiator to the distribution manifolds.

For the purposes of this invention, note that there are two well-known types of heating bodies for space heating purposes, hereinafter referred to as "radiators", as they are commonly called, though this term is improper because the heat is produced not only by radiating but mainly by convective heat exchangers. The first type refers to pressure diecast radiators, i.e. composed of pressure diecast modules of an Al - Si alloy. Said modules are lined up in the appropriate quantities to deliver the amount of heat needed and are connected to each other, as is known, by right-left thread nipples and gaskets which can be hidden from view. The modules of the pressure diecast radiators are fitted on each side with many fins that increase the convective heat exchange surface area; said fins can also be very large to fully exploit the heat transmission permitted by the optimum heat conductibility of the material. However, the maximum width of said modules is limited by die casting restraints. In fact, as will be clarified later, when commenting on the attached Figures, in order for the fins to be extracted from the die they must be drawn at a certain draft angle (generally about 0° 45'); consequently the maximum extension of the fins, in other words the maximum width of said modules, is limited by the need to avoid excessive thickness of the fins at the root to avoid wasting material. Another drawback of pressure diecast radiators is that each different height requires a different pressure cast die, so the range of feasible heights is limited.

In radiators made with pressure diecast modules, each element also includes a trunk of the distribution manifolds.

The second type of radiator, to which the present invention refers, is composed of profiled elements obtained by extruding suitable known aluminium alloys.

This type of radiator shall hereinafter be referred to as "section bar radiator".

Aluminium alloy sections of are easily obtained with low-cost extrusion equipment and that make it easy to obtain section bars having a rather complicated cross-section; it is also simple to obtain fins that are thin but unconstrained by die draft requirements, unlike elements obtained from die casting.

A notable advantage of section bar radiators is the possibility of composing models of various heights, even upon specific request, without needing additional extrusion equipment. Section bar radiators have vertical elements (hereinafter referred to as "uprights" which are different from distribution manifolds (hereinafter referred to simply as

"manifolds").

One difficulty in assembling these radiators involves precisely the mechanical and hydraulic T connection between said uprights obtained by a section bar and said distribution manifolds, also obtained from section bars; the known solutions significantly reduce the advantages of section bar radiators in relation to pressure diecast radiators.

It should be noted that after assembly the radiators are subjected to a hydraulic water tightness test and if even one gasket does not pass the test, the entire radiator must be dismantled to replace the component and/or defective sealing device.

Said disassembly for repairs/replacements of parts may also be required after the radiator has been installed and operated, e.g. due to deterioration of the seal gaskets. Said mechanical and hydraulic connection, therefore, must be obtained by means that allows them to be disengaged.

The known nipple attachments of pressure diecast radiators allow disassembly but they are unsuitable for section bar radiators because they would require an excessive inside diameter of the upright pipes for water circulation resulting in greater weight and cost than necessary. Moreover, since accessibility from outside would be required to fasten them in proximity to said T connections, they would not be satisfactory aesthetically because it would be impossible to hide them from view. Document FR2186305 contemplates that the vertical elements are connected to the manifolds by means of plastic deformation to produce particular seaming; in other words, by means that allow them to be separated from each other. Documents DE2733892 and IT1248375 use elastic gaskets as sealing devices but mechanical constraints require welding the vertical elements to the manifolds and therefore use means that cannot be separated from each other without destructive effects.

Document DE2363992 expands the ducts of the vertical elements into the appropriate manifold housings. Nor in this case can they be released from each other; moreover, since the radiators are subjected to uneven heat dilation that causes tension and deformation, the lack of elastic means in the joint parts makes the water tightness somewhat unreliable.

Document EP 1043560 proposes a solution having a good aesthetic result but it is rather laborious to achieve.

Most of the documents examined above, therefore, lack the possibility of nondestructive disassembly; document EP 1043560 offers this possibility but with means and methods that appear to be quite costly. One of the purposes of the present invention is to indicate means and methods for a separable type of mechanical and hydraulic connection of the vertical elements of said radiator to the distribution manifolds, at least separable enough to allow the repair/replacement of components that may be found defective during inspection.

A second purpose of the present invention is to obtain, by means of the aforesaid means and methods, a joint that is hidden from view.

A third purpose of the present invention is to enable the means of hydraulic water tightness to support, without leaking, tension and slight deformation due to uneven heat-incurred dilation.

An additional purpose of the present invention is to eliminate the need of cleaning the joined parts.

An additional purpose of this invention is to drastically reduce the amount of aluminium required, heat exchange surface being equal. Since making aluminium requires a significant consumption of electricity, said industry creates considerable environmental impact. Reducing the consumption of raw materials, therefore, achieves the additional purpose of reducing environmental impact.

These and other purposes are achieved by the means and methods described below and in the attached claims, part and parcel of the description, and as exemplified in the attached drawings.

Fig. 1 shows, in axonometric projection, a section bar radiator according to the invention.

Fig. 2 shows a top view of the radiator depicted in Fig. 1. Fig. 3 shows an upright of the radiator in Fig. 1 in a section at a right angle from the main axis.

Fig. 4 shows in detail the main elements of a section bar radiator according to a preferred form of the invention.

Figures 5. a, 5.b and 5.c show in sequence three phases of assembly of the section bar radiator according to the embodiment in Fig. 4. Figures 6, 7 and 8 show three different alternatives of the embodiment in Fig. 4.

Fig. 9 depicts the dimensions of the main components for a section bar radiator made possible by the invention.

All the Figures show only the top part of the section bar radiator and the corresponding components because, logically, the bottom part is identical to the top.

With particular reference to Figures 1, 2, 3 and 4, the section bar radiator 1 according to the invention includes two manifolds 2, one or more uprights 3 and an elastic gasket 4 that provides water tightness between said two manifolds 1 and uprights 3.

Each manifold 2 has a pipe 205 to allow flow of a thermovector fluid sent by and taken back to the uprights 3, a base 206 and a groove 202 on each side 208.

In correspondence to the base 206 a plurality of through-cavities 207 are obtained by milling, and through each of them the pipe 205 communicates with the ducts 301 of the same number of uprights 3.

The connections between pipe 205 and ducts 301 are watertight by virtue of appropriate sealing devices.

Preferably, but only for aesthetic purposes, on the top of manifold 2 there are also two fins 201 that serve as a partial top cover of the section bar radiator 1. Even more preferably, the total width of said two fins 201 is equal to the thickness C4 of manifold 2.

Each upright 3 includes, besides said duct 301 in which the thermovector fluid distributed by manifolds 2 flows, a core 302 that connects said duct 301 to two internal fins 304 and two end fins 303. Preferably the internal fins 304 have a width M5 that is almost equal to the outside diameter M6 of pipe 301, while the end fins 303 have a width typically considered optimal for the heat-producing performance of the section bar radiator.

Naturally the width of the end fins 303 determines the interaxis between the through-cavities 207 prepared in the manifolds 2. Said two internal fins 304 have internal faces having a distance between each other M4 equal to the thickness C4 of manifold 2.

At both ends of said uprights 3, the core 302 is taken to an area 306 that extends horizontally by a distance of M4 that runs from one internal face to the other of the internal fins 304, while it extends vertically to a depth Ml of not less than the distance C2 between the upper edge of the grooves 202 and the base 206 of said manifolds 2. Preferably, however, for aesthetic reasons, said depth Ml is equal to the height Cl of manifold 2, which can therefore be entirely housed inside area 306. According to the preferred embodiment, said appropriate means of water tightness are provided as follows:

- the pipe 301 stretches to area 306 with an extension 305 having a length M2 that allows it to penetrate into the corresponding through-cavity 207 when the section bar radiator 1 is assembled; said extension 305, which has been appropriately milled on the outside to slightly reduce the diameter from the outside diameter M6 to M3 and give it a completely circular surface section into which a stop washer 401 with suitable interference can be inserted to strike against strike plate 307 obtained by said milling process; said stop washer 401 has an outside diameter G3 such that it can fit inside a seat 204 created at the bottom of through-cavity 207 and a thickness Gl equal to the depth C7 of the seat 204; on top of said stop washer 401 is placed an additional sealing device consisting of an O-ring gasket 4, having dimensions that allow suitable interference with the truncated cone portion 2041 of the through-cavity 207 located above the seat 204.

According to the same embodiment, with reference to Figures 5. a and 5.b, the section bar radiator 1, is assembled as follows:

- the stop washers 401 having O-ring gaskets above them are introduced into the corresponding extensions 305 or into the corresponding seats 204, in the latter case with said O-ring gasket 4 positioned on the truncated cone portion 2041 of the through-cavity 207;

- all uprights 3 are placed between the two manifolds 2 to align all uprights 3 with the corresponding through-cavities 207 of the two manifolds 2;

- all extensions 305 are inserted simultaneously into the corresponding through-cavities 207;

- the two manifolds 2 press against each other in the direction of the arrows shown in Fig. 5.b, i.e. in the direction of the principal axis of the uprights 3 until, after reaching the bases 206 by striking on the bottom of areas 306, the O-ring gaskets 4 are pressed into the truncated cone portions 2041 of the through-cavities 207 and the inside faces of the two internal fins 304 come into contact with the sides 208 of manifolds 2, at least until covering said grooves 202 or the internal sides 208, depending on the chosen depth Ml . At this point, said sealing devices are in the definitive position and two alternative embodiments of the invention can be followed. According to the first embodiment, the section bar radiator 1 can be subjected to a water tightness test.

If the test fails, the radiator is disassembled and the defective components 2 and/or 3 and/or 4 are replaced; it is then reassembled and the test is repeated with components 2, 3 and 4 in their definitive position. After the test produces an acceptable result, the two manifolds 2 are joined to uprights 3 by caulking to join them to each other; said operation consists of a plastic deformation in a limited area of the uprights 3 against the manifolds 2 or, vice versa, in a limited area of the manifolds 2 against the uprights 3. This caulking is performed to obtain only slight plastic deformations so that, with the proper tool, the seam can be separated without destructive effects on the manifolds 2 and/or uprights 3 which consequently can be again joined to each other by the same caulking operation: in fact the aluminium alloys used to make section bars suitable for building the radiators are sufficiently plastic not only to eliminate the previously obtained plastic deformation, but also to produce it again at the same location without destructive effects. According to the second embodiment, the water tightness test is performed after caulking in a way that obtains a slight plastic deformation. At this point that usual test is performed on the section bar radiator 1 to check its water tightness. If any seams are defective, the section bar radiator 1 can be disassembled again by eliminating the caulked seam. Then, after replacing components 2 and/or 3 and/or 4, which are defective, they caulked to each other again and the test is repeated. According to one of the preferred embodiments of the invention, Figures 5.b and 5. c, the caulking is done with two punches 5 pressed against the internal fins 304 in the limited area 308 in correspondence to the grooves 202 until said internal fins 304, by means of plastic deformation, penetrate into the grooves 202, thereby creating a connection that is stiff but can be disconnected by applying leverage with a drift (operation not shown in any of the figures) between the internal fin 304 in the bottom of the groove 202.

If, in the case where disassembly and new assembly is required, there is concern of the impossibility of repositioning the internal fin 304 and repeating a plastic deformation without destructive effects, it is always possible during the initial assembly to caulk only two diametrically opposed semi-fins 304. a, disassemble by destroying the caulked part and, lastly, reassemble the viable semi-fins directly opposite each other 3O4.b.

Fig. 1 shows how said caulking area 308 can be substantially hidden from view in the assembled section bar radiator 1. It is obvious that many embodiments are possible, for those who know the art, without going beyond the scope of the invention.

As regarding the seam made by caulking, many equivalent means alternative to fins 304 or semi-fins 304. a, 3O4.b can be indicated to obtain a reversible plastic deformation of a limited area of the uprights 3 against the manifolds 2 or vice versa. Moreover, said equivalent means, similar to the two diametrically opposed semi- fins already seen 3O4.a, or 3O4.b, could be included in a first unit to be used in the first assembly and in a second unit to be used in a possible second assembly following disassembly for the purpose of replacing defective components. As regards the sealing devices, many embodiments are also possible. Two embodiments are proposed here.

With reference to Fig. 6, water tightness is obtained by using only the elastic gasket (0-ring) 4.b housed in the throat 3O5.b of the extension 305, while the through-cavity 207 is cylindrical and has a diameter suitable for sealing the O- ring 4.b. There are at least two advantages to this embodiment: during the assembly phase, it is sufficient to put the manifolds 2 against each other according to the arrows shown in Fig. 5.b, until the bases 206 strike the bottom of the areas 306 without requiring a stop washer 401 as in the preferred embodiment of figures 5. a, 5.b and 5.c; - slight plastic yielding of the caulked seam does not compromise water tightness.

Fig. 7 shows an embodiment alternative to that shown in Figures 5. a, 5.b and 5.c, in which water tightness is obtained by means of an elastic flat gasket 4 inserted on the flat end 3O7.b of the duct 301 or in the seat 204. Said elastic flat gasket 4 has an outside diameter such that it fits in the seat 204 made on the bottom of the through-cavity 207 and thickness Gl slightly greater than depth C7 of the seat 204 itself.

With reference to Fig. 8, along with core 302, in the area 306, ducts 301 are also shorn and water tightness is obtained by means of an elastic flat gasket 4 having a thickness Gl slightly greater than depth C7 of the seat 204.

During assembly the two manifolds 2 must be placed together by exerting sufficient force to press said elastic flat gasket 4 between its seat 204 and the flat end 307.b of the duct 301; however there is the advantage of a highly simplified working of the uprights 3 in correspondence to the areas 306. The advantages offered by the simple sealing devices and the seam indicated here are considerable with respect to the available technologies known to the art. As stated above, the technology of extruding aluminium alloys makes it possible to obtain section bars whose thickness could have a lower limit determined merely by structural and heat transmission needs, while diecast pieces require certain draft angles and this imposes lower limits than necessary from the functional standpoint.

These potentials, however, have not been fully exploited till now due to the constraints created by the hydraulic and structural devices for joining the manifolds to the uprights. To make the advantages of the invention even more evident, the following numerical example is appropriate. It refers to a section bar radiator 1 built according to the invention and having the preferred dimensions. Fig. 9 shows the principal measurements of the sections of section bars used for the manifold 2 and upright 3 according to a preferred form of construction. In particular, upright 3 has a thickness between 50 and 90 mm, a duct 301 having an outside diameter between 5 and 23 mm, a core 302 whose thickness is between 0.8 and 3 mm, said core 302 connecting said duct 302 to two internal fins 304 (having a thickness between 0.8 and 3 mm and width between 5 and 23 mm) and to two end fins 303 (having a thickness between 0.8 and 3 mm and a width between 10 and 60 mm).

More precisely, according to a preferred form of construction, the upright 3 has a thickness of 70 mm, the duct 301 has an outside diameter of 8 mm, the core 302 has a thickness of 1 mm, the internal fins 304 have a thickness of 1 mm and a width of 8 mm, the end fins 303 have a thickness of 1 mm and a width of 23 mm.

Generally speaking, a section bar radiator 1 having uprights 3 of a thickness between 50 and 90 mm and a height between 400 and 600 mm, and manifolds 2 having a length between 600 and 1000 mm, translate to a section bar radiator 1 that uses between 24 and 40 uprights 3, weighing between 5.80 Kg and 8.80 Kg. with an exchange surface of between 2.70 m² and 4.10 m . More precisely, with the measurements shown in Figure 9 of the preferred embodiment of the invention, a section bar radiator 1 having uprights 3 that are 500 mm high and manifolds 2 that are 800 mm long, i.e. a section bar radiator 1 that uses 32 uprights 3 having height and width and thickness 500 x 800 x 70, weighs only 7.3 kg and has an exchange surface of 3.40 m²

A standard section bar radiator, having measurements equal to the one that is the subject of the present invention, has a weight of 9 kg with an exchange surface of 3.70 m². A radiator made of diecast aluminium alloys having a height x width x thickness of 575 x 800 x 70 mm weighs 12.1 kg and has an exchange surface of 3.70 m². To make this advantage even more obvious, the section bar radiator 1 allows a surface/weight ratio of 3.40 m² / 7.3 kg = 0.47 m²/kg while the standard section bar radiator has a ratio of 3.70 m² / 9 Kg = 0.41 m²/Kg and the diecast radiator has a ratio of 3.7 m² / 12.1 kg = 0.31 m²/kg; in other words in the section bar radiator 1 , the necessary exchange surface being equal, only one third of the material used by diecast radiators is needed.

Moreover the section bar radiator 1 has a power/weight ratio of approximately 7.30 g/W, compared to the approximate 9 g/W ratio for a standard section bar radiator and approximately 12 g/W for a standard diecast radiator. It should be noted, at this point, that the other listed purposes, besides the ones highlighted, are also achieved by this invention.

Since caulking is a clean joining method, unlike welding or material removal processes, the joined parts need not be cleaned. Moreover, the joints obtained in proximity to the grooves 202 remain hidden. If the elastic flat gasket 4 is used as part of the hydraulic sealing device, it is pressed into its seat and therefore allowed to become slightly looser by effect of the small deformations caused by the uneven heat dilations, but does not break its seal as a result of them; therefore the elastic O-ring gasket 4 of the preferred embodiment shown in Figures 5. a to 5.c or elastic O-ring gasket 4.b of the embodiment shown in Fig. 6 is even less sensitive.

Claims

1. Method for assembling a radiator made of section bars (1 ), including

- two manifolds (2), each fitted with a pipe (205) and a plurality of through-cavities (207) through each of which said pipe (205) is connected to the duct (301 ) of a corresponding upright (3),

- and one or more uprights (3) each equipped with said duct (301) in which the thermovector fluid flows, distributed by the aforesaid manifolds (2), and a core (302) which connects said duct (301) to two end fins (303), one or more of the aforesaid uprights (3) being hydraulically connected and mechanically secured to said manifolds (2), where said hydraulic connection is made in correspondence to said through- cavities (207) and is obtained by means of sealing devices (4, 401, 2041, 204, 307; 4.b, 207, 305.b; 4, 204, 3O7.b) which have an elastic gasket (4; 4.b), said method implementing firstly operations to provide watertightness and secondly operations to obtain the mechanical constraint, characterized by the following steps (a) insert said gaskets (4, 4.b) into the corresponding housings (305 or 2041; 305.b; 204),

(b) all the aforesaid uprights (3) are placed between the two aforesaid manifolds (2), aligning all the uprights (3) with the corresponding through-cavities (207) of the two aforesaid manifolds (2), (c) press the aforesaid manifolds (2) against one another in the direction of the main axis of said uprights (3),

(d) a constraint is built between said uprights (3) and the two aforesaid manifolds (2) by caulking them together, said caulking consisting of a reversible plastic deformation of a first and/or second group of parts (304; 3O4.a; 3O4.b) of the uprights (3) in a limited area on them (308) against a specific area (202) of said manifolds (2) or, vice versa, of a limited area of the manifolds (2) against the uprights (3).

2. Method of assembling a radiator made of section bars (1) according to the previous claim characterized by the fact that between the aforesaid steps (c) and (d), a watertightness inspection is performed on the aforesaid sealing devices (4, 401, 2041, 204, 307; 4.b, 207, 305.b; 4, 204, 307.b), and by the fact that if the inspection does not produce a good result,

- any defective components (2, 3, 4; 2, 3, 4.b) of the radiator made of section bars (1) are replaced,

- steps (a), (b), (c) are repeated, - said inspection is repeated.

3. Method of assembling a radiator made of section bars (1) according to claim 1 characterized by the fact that after the aforesaid steps from (a) to (d), a watertightness inspection is performed on the aforesaid sealing devices (4, 401, 2041, 204, 307; 4.b, 207, 305.b; 4, 204, 3O7.b), and by the fact that if the inspection does not produce a good result,

- said constraint obtained by caulking is eliminated, - steps from (a) to (d) are repeated,

- said inspection is repeated

4. Method of assembling a radiator made of section bars (1) according to any previous claim characterized by the fact that - said uprights (3) including two internal fins (304) made up of two semi-fins (3O4.a, 3O4.b) whose internal faces have a distance between them that is (M4) equal to the thickness (C4) of said manifolds (2)

- and making a groove (202) on each side (208) of said manifolds (2) ,

- before said step (a) on both ends of said uprights (3), said core (302) is removed in an area (306) extending horizontally along the distance (M4) from one internal face to the other of said internal fins (304), while extending vertically in depth (Ml) no less than the distance (C2) between the upper edge of the aforesaid grooves

(202) and the base (206) of said manifolds (2),

- and caulking of said step (d) consists of pressing against said internal fins (304; 3O4.a, 3O4.b) in the limited area (308) corresponding to said grooves (202) until said internal fins (304; 304. a, 3O4.b), have penetrated into said grooves (202) by plastic deformation,

- in particular said caulking being performed either on a single pair of the aforesaid semi-fins (304. a; 3O4.b) diametrically opposed with respect to the axis of said duct (301) or on both said pairs of semi-fins (3O4.a, 3O4.b).

5. Radiator made of section bars (1) to be assembled according to one or more previous claims, including

- two manifolds (2) each is fitted with a pipe (205) and a plurality of through-cavities (207) through each of which said pipe (205) is connected to the duct (301) of a corresponding upright (3),

- and one or more uprights (3) each equipped with the aforesaid duct (301) in which the thermo vector fluid flows, distributed from said manifolds (2), and a core (302) which connects said duct (301) to two end fins (303), - the aforesaid one or more uprights (3) being hydraulically connected and mechanically constrained to said manifolds (2), where said hydraulic connection is made in correspondence to said through-cavities (207) and obtained by means of sealing devices (4, 401, 2041, 204, 307; 4.b, 207, 305.b; 4, 204, 3O7.b) which have an elastic gasket (4; 4.b), characterized by the fact that

- the two aforesaid manifolds (2) also have a groove (202) on each side (208),

- the one or more aforesaid uprights (3) also include two internal fins (304) whose internal faces have a distance between them

(M4) equal to the thickness (C4) of said manifolds (2), at both ends of said uprights (3) said core (302) is removed in an area (306) extending horizontally along the distance (M4) between the internal faces of said internal fins (304), while vertically extending to a depth (Ml) no less than the distance (C2) between the upper edge of said grooves (202) and the base (206) of said manifolds (2).

6. Radiator made of section bars (1) according to the previous claim, characterized by the fact that said depth (Ml) of said area (306) is equal to the height (Cl) of the manifold (2).

7. Radiator made of section bars (1) according to previous claims 5 or 6, characterized by the fact that the two aforesaid manifolds (2) also have two fins (201) at the top.

8. Radiator made of section bars (1) according to the previous claim, characterized by the fact that the total width of the two aforesaid fins (201) is equal to the thickness

(C4) ofthe manifold (2).

9. Radiator made of section bars (1) according to at least claim 5, characterized by the fact that each of the aforesaid sealing devices (4, 401, 2041, 204, 307; 4.b, 207, 305.b; 4, 204, 3O7.b) includes

- an extension (305) of said pipe (301)

- stretching inside said area (306) for a length (M2) sufficient to allow the extension (305) itself to penetrate the corresponding through-cavity (207)

- and appropriately reduced to a diameter (M3) slightly smaller than the outside diameter (M6) of said pipe (301), said variation of diameter forming beat (307), - a seat (204) made on the bottom of said through-cavity (207) and a trunconical portion (2041) located above said seat (204),

- a beat washer (401) to be inserted with slight interference into said extension (305) of said pipe (301) and having a thickness (Gl) equal to the depth (C7) of said seat (204) - and an elastic OR-ring gasket (4) to be positioned above said beat washer (401) and having such dimensions as to allow a suitable interference with said trunconical portion (2041) of said through- cavity (207).

10. Radiator made of section bars (1) according to at least any one of the claims from 5 to 8, characterized by the fact that each of the aforesaid sealing devices (4, 401, 2041, 204, 307; 4.b,

207, 305.b; 4, 204, 3O7.b) includes

- an extension (305 ) of said pipe (301 ) - stretching inside said area (306) for a length (M2) sufficient for the extension (305) to penetrate into the corresponding through-cavity (207) and fitted with a neck (305.b),

- a cylindrical through-cavity (207), - an elastic OR-ring gasket (4.b) to be housed in said neck (305.b) and provide watertightness inside said cylindrical through-cavity (207).

11. Radiator made of section bars (1) according to at least any one of the claims from 5 to 8, characterized by the fact that each of the aforesaid sealing devices (4, 401, 2041, 204, 307; 4.b, 207, 305.b; 4, 204, 3O7.b) includes

- an extension (305) of said pipe (301)

- stretching inside said area (306) for a length (M2) sufficient for the extension (305) to penetrate into the corresponding through-cavity (207)

- and appropriately reduced to a diameter (M3) slightly smaller than the outside diameter (M6) of said pipe (301), said variation of the diameter forming a beat (3O7.b), - a seat (204) made on the bottom of said through-cavity (207),

- a flat elastic gasket (4) to be inserted into said seat (204) or on said flat end (3O7.b) of said duct (301) and having an outside diameter such that it can be housed in said seat (204) and a thickness slightly greater than the depth (C7) of said seat (204).

12. Radiator made of section bars (1) according to at least any one of the claims from 5 to 8, characterized by the fact that each of the aforesaid sealing devices (4, 401, 2041, 204, 307; 4.b,

207, 305. b; 4, 204, 3O7.b) includes - a seat (204) made on the bottom of said through-cavity (207),

- a flat elastic gasket (4) to be housed in said seat (204) and having a thickness (Gl) slightly greater than the depth (C7) of the seat (204) itself,

- while said pipe (301) is eliminated from the entire aforesaid area (306).