EP0748996B1 - Device for securing a tube bundle particularly for a heat exchanger - Google Patents

Description

• des barres séparant les colonnes consécutives de tubes, lesdites barres étant solidaires à leurs extrémités de profilés supports encadrant extérieurement, et parallèlement aux n rangées, le faisceau de tubes,
• des profilés de maintien transversal, perpendiculaires aux dites barres et séparant les rangées consécutives de tubes,
• des pattes de maintien longitudinal, encastrées dans un pas du filet de l'ailette des tubes,

   lesdites barres et lesdits profilés de maintien transversal dudit agencement formant, dans un plan perpendiculaire à l'axe des tubes, un maillage de maintien des tubes du faisceau.The present invention relates to a bundle of tubes, the tubes being arranged in n rows of p columns, each tube being provided with an external helical fin, said bundle comprising over its length, at least one arrangement for holding said bundle of tubes, a such arrangement comprising:

• bars separating the consecutive columns of tubes, said bars being integral at their ends with support profiles externally framing, and parallel to the n rows, the bundle of tubes,
• transverse holding profiles, perpendicular to said bars and separating the consecutive rows of tubes,
• longitudinal retaining tabs, embedded in a pitch of the thread of the fin of the tubes,

said bars and said transverse retaining profiles of said arrangement forming, in a plane perpendicular to the axis of the tubes, a retaining mesh of the tubes of the bundle.

Such a beam is known from United States patent 4,325,171. In this document, the mesh consists of support means comprising bars horizontal and each bar has vertical profiles for separating tubes. The constitution of this mesh is complicated. Furthermore, the legs of longitudinal support are linked to each other by welds. Such an assembly is long and requires numerous welds.

The invention allows simpler mounting and with fewer welds, thus obtains an arrangement which is less costly in terms of resources and manpower.

The subject of the invention is therefore a bundle of tubes as defined above, characterized in that each bar has along its length n-1 orifices, each transverse retaining profile being threaded into a said corresponding orifice each bar and in that said longitudinal holding tabs are constituted dishes separated from each other and each with a leg and at least one connecting tab with said mesh, said connection being made on the corresponding transverse retaining profile.

According to the preferred embodiment, the tongue of connection is fixed on the transverse retaining profile corresponding, this fixing being produced by deformation of this tab around the profile.

Advantageously, said bars consist of flat bars.

Preferably, said dishes have a U shape, the core of the U constituting the mounting tab and the branches of the U forming two connecting tabs.

The invention can be used in a heat exchanger consisting of a bundle consisting of tubes arranged in n rows of p tubes, several holding arrangements such as as previously described now this beam, distributed along the length of it.

The invention is described below in more detail at using figures representing only one embodiment preferred of the invention.

Figure 1 is a partial top view of a bundle of tubes fitted with a holding arrangement according to the invention.

Figure 2 is a sectional view II-II of Figure 1.

Figure 3 is a top view of a dish of longitudinal support used in the arrangement in accordance with the invention.

Figure 4 is a side view of this dish in the state folded.

FIG. 5 is a view of the detail V of FIG. 1.

FIG. 6 is a view of detail VI of FIG. 1.

Figure 7 is a sectional view along VII-VII of the figure 5.

The heat exchanger partially shown in Figures 1 and 2 in top view is preferably vertical and supported in the upper part of the boiler recovery where it is installed. On the height of the boiler, it must be maintained by fittings according to the invention distributed over this height.

The heat exchanger consists of a bundle of tubes 1, preferably of the same diameter, consisting of tubes each provided with a helical external radial fin 2 and arranged in n rows 3 of p tubes 1. Laterally, the beam is connected to support profiles made up of angles 11 which are secured by screwing or equivalent to the refractory wall 13 limiting the boiler.

• des profilés de maintien transversal 4, de préférence de section carré, disposés entre chaque rangée 2,
• des barres 6, avantageusement plates, perpendiculaires auxdits profilés de maintien transversal 4 séparant les p tubes adjacents 1 des n rangées 3, les profilés de maintien transversal 4 étant enfilés dans n-1 orifices 7, de préférence poinçonnés, espacés de sensiblement le diamètre des tubes et prévus sur ces barres 6, lesdites barres 6 et lesdits profilés 4 formant un maillage de maintien,
• des plats 8 séparés comportant chacun une patte d'encastrement 9 formant une patte de maintien longitudinal encastrées dans un pas du filet de l'ailette 2 du tube 1 correspondant et au moins une languette 10 de liaison avec ledit maillage, fixée sur le profilé de maintien transversal 4 correspondant, cette fixation étant réalisée par déformation de cette languette 10 autour du profilé 4.

The holding arrangement includes:

• transverse holding profiles 4, preferably of square section, arranged between each row 2,
• bars 6, advantageously flat, perpendicular to said transverse retaining sections 4 separating the p adjacent tubes 1 from n rows 3, the transverse retaining sections 4 being threaded in n-1 orifices 7, preferably punched, spaced substantially the diameter of the tubes and provided on these bars 6, said bars 6 and said sections 4 forming a retaining mesh,
• separate plates 8 each comprising a mounting tab 9 forming a longitudinal retaining tab embedded in a pitch of the fin of the fin 2 of the corresponding tube 1 and at least one tongue 10 for connection with said mesh, fixed to the profile of corresponding transverse support 4, this fixing being produced by deformation of this tongue 10 around the profile 4.

A dish 8 is shown in the unfolded state on the Figure 3 and in the folded state in Figure 4.

It has a U shape, the soul of the U constituting the leg 9 and the branches of the U forming two connecting tabs 10.

These two branches 10 are folded twice at an angle straight to grip a transverse support profile as shown in Figures 5 and 7.

Once the tubes 1 of a row 3 have been laid, these dishes 8 are embedded by their mounting tab 9 in one step of the fin of the fin 2 of a tube already laid and their folded tongue 10 encloses the section 4 where it is blocked by punching.

In Figure 6 is shown a detailed view of a tube 1 arranged at the lateral edge of the bundle where it is held by the angle iron 11 on which are welded 12 dishes embedded in a pitch of the fin of the corresponding tubes 1 and bars 6.

• sur la première cornière 11 sont soudés une extrémité des barres 6, un tube 1 étant posé entre chacune d'elles,
• un profilé de maintien transversal 4 est enfilé dans le premier orifice 7, venant bloquer transversalement la première rangée de tubes 1,
• un certain nombre de plats 8 sont mis en place comme précisé plus haut, leur nombre étant choisi selon la résistance du maintien longitudinal nécessaire,
• une deuxième rangée de tubes 1 est posée sur le profilé 4 et les précédentes étapes sont reproduites jusqu'à la dernière rangée où la seconde cornière 11 équipée de plats 12 est soudée à l'autre extrémité des barres 6.

The mounting of such a bundle is carried out in the horizontal position of the tubes 1 as follows, at various points distributed over the length thereof:

• on the first angle 11 are welded one end of the bars 6, a tube 1 being placed between each of them,
• a transverse retaining section 4 is threaded into the first orifice 7, coming to block transversely the first row of tubes 1,
• a certain number of dishes 8 are put in place as specified above, their number being chosen according to the resistance of the required longitudinal support,
• a second row of tubes 1 is placed on the profile 4 and the previous steps are repeated until the last row where the second angle iron 11 fitted with plates 12 is welded to the other end of the bars 6.

Claims (4)

1. A set of tubes (1), the tubes being disposed in n rows of p columns, each tube (1) being provided with a helical outer fin (2), said set including, over its length, at least one rack for holding said set of tubes, such a rack including:

   bars (6) separating the consecutive columns of tubes (1), said bars being secured at their ends to support section members (11) which surround the set of tubes, parallel to the n rows;

   transverse holding section members (4) that are perpendicular to said bars (6) and that separate the consecutive rows of tubes;

   longitudinal holding lugs (8) engaged in gaps between the turns of the fins (2) on the tubes (1);

      said bars (6) and said transverse holding section members (4) of said rack forming, in a plane perpendicular to the axis of the tubes, a mesh for holding the set of tubes, the set of tubes being characterized in that each bar (6) includes n-1 orifices (7) over its length, each transverse holding section member (4) being threaded through a corresponding one of said orifices in each bar (6), and in that said longitudinal holding lugs (8) are constituted by mutually separate brackets each including an engageable lug (9) and at least one fastening tab (10) for fastening it to said mesh, said fastening tab being fastened to the corresponding transverse holding section member (4).
2. A set of tubes according to claim 1, characterized in that the fastening tab (10) is fixed to the corresponding transverse holding section member (4) by being deformed around said section member (4).
3. A set of tubes according to claim 1 or 2, characterized in that said bars (6) are constituted by flat bars.
4. A set of tubes according to any preceding claim, characterized in that said brackets (8) are U-shaped, the web of the U constituting the engageable lug (9), and the branches of the U forming two fastening tabs (10).

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