FI59296C - FOERFARINGSSAETT FOER VAERMEISOLERING AV ROERKROEKAR MED MINERALULLSPRODUKTER - Google Patents

Description

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Sweden-Sverige (SE) 16109/72 (71) Rockwool Aktiebolaget, Skövde, Sweden-Sverige (SE) (72) Per Lundqvist, Skövde, Jan Fritz, Skövde, Sweden-Sverige (SE) (7 * 0 Berggren Oy Ab ( 5M Method for thermal insulation of pipe bends with mineral wool products - Förfaringssätt för värmeisolering av rörkrökar med mineralullspro-dukter

Swedish Pat. concentric annular bodies, preferably cut from a plastic-bonded glass or mineral wool felt or sheet in its thickness direction.

In this known arrangement of the tubular insulation element, the cover consists mainly of a laminate folded or shirred in the circumferential direction of the insulating part, most preferably comprising an aluminum foil, and having a thermoplastic layer on its inner side, preferably polyethylene, to which the insulating fibers are melted.

This fit is desired to ensure high axial compressibility of the element, pleating of the cover in bending of the element, and axial compression.

59296

However, attempts to exploit such elements have largely failed. Research has shown that the reasons for this are manifold. Firstly, there are technical difficulties in obtaining a bent or shirred top layer, and all attempts to overcome these difficulties have made manufacturing so complex and expensive that it has not been possible to sell elements at virtually competitive prices, but the pipeline industry has given priority to cheaper pipe insulation. have been less comfortable in use. Secondly, said pipe insulation elements have been difficult to transport and store on construction sites because they have been easily damaged by lateral compressions so that they have lost their shape. After all, they are more easily deformable in nature than traditional pipe shells. If the shape damage is limited to a single point in the pipe insulation, then the entire insulation element must have been discarded. Thirdly, it has proved difficult to place the finished pipe insulation elements on top of the pipe bends, as they have caused considerable resistance to deformation, albeit bending! the depth of wrinkling was very large. In addition, very large bending or wrinkling depths have led to damage to the structure of the fibrous material inside the insulating element, while, of course, the insulating ability has also been compromised.

The present invention relates to a method for the thermal insulation of pipe bends, in which, as far as is appropriate, a previously known principle is used, but changes are made which lead to the elimination of the disadvantages described above.

The invention thus relates to a method for thermally insulating pipe bends using mineral wool products for pipe bend insulation, which pipe bends are connected to straight pipe sections, at least one of which is already insulated, most preferably in the form of a prefabricated and placed on top of a pipe shell. in the plane, placed on top of the pipe bend tightly against each other.

The invention is characterized in that castors made of such a porous mineral wool mat that they can be easily compressed in the axial direction and whose planes are parallel and in which dn is substantially the same thickness are threaded into or after this is connected to the pipe bend and then pushed over the same straight pipe section by a pipe shell or similar insulation over the insulation of the straight pipe section connected to its opposite end of the pipe bend at such a pressure that .

The invention will be explained in more detail below with reference to two embodiments shown in the accompanying drawing, but the invention is not limited to these embodiments, and various variations may be included in the invention within the scope of the following claims.

Figure 1 shows in a drawing a pipe bend as well as straight pipe sections connected to its ends as well as rollers for insulating the pipe bend.

Figure 2 is a perspective view of a spinner that can be used to practice the invention.

Figure 3 shows a pipe bend provided with straight pipe sections connected to both ends and a number of rollers for installation according to the invention.

In Figure 1, the pipe bend 10 is connected directly to the pipe section 11, which is already insulated by a pipe shell 12 made of mineral wool, and also to another straight, possibly still uninsulated pipe section 13.

The pipe bend is then insulated as follows: At the end 14 of the pipe bend 10 connected to the pipe 13, rollers are introduced in succession, which may be cut from a mineral wool, for example a rock wool mat or felt, so as to take the shape shown in Fig. 2. thus initially at least approximately evenly thick and cut with an incision 16 so that they can be easily pushed onto the pipe bend 10 and moved along it to the positions in which the wheels 17 are. The layers of rock wool, which it always has, are in the plane of the wheels, which results in the wheels being very resistant to deformation which occurs perpendicular to the axial direction, but is easily compressed in the axial direction. When each such roller comes close to the edge 18 of the previous roller 17, it is compressed by light compression, a difficulty which can be determined and achieved even if the rollers are set by hand. As a result of this compression, the roller deforms to a weakly wedge-shaped shape so as to obtain a smaller thickness on the inside of the pipe bend 10 and a slightly greater thickness on the outside of the pipe bend, most preferably the original thickness of the roller in its uncompressed or unmounted state. After the pipe bend 10 is thus provided with a continuous series of counter-rotating wheels 15, the straight part 13 associated with the pipe bend is insulated, most preferably with a prefabricated pipe shell, corresponding to the pipe shell 12.

Thus, when the rollers 17 are pushed, the already existing tube shell 12 acts in response to the first rollers, and as the set of rollers gradually grows in this way, this set of rollers already built acts in response to the subsequent rollers. The rollers are elastically compressed and therefore have a natural tendency to expand in the direction in which they would automatically protrude from the free end of the pipe bend 14. However, this is prevented by insulating the straight pipe section 13 in a suitable manner, for example with a pipe shell (not shown). in its position on the pipe bend 10 between the pipe shells placed on both connecting parts 11 and 13.

Figure 3 shows a pipe bend 10 and associated with a straight pipe 11 and its insulator 12. A straight pipe section 13 is likewise pre-connected to the pipe end 14 of the pipe bend 10, on which the wheels 19 are successively placed tightly against each other, but without compression. In addition, a pipe 20 is arranged in the prefabricated pipeline. When a pre-calculated number of such rollers is placed on the pipe 13, which is assumed to be correct for pipe bend insulation (the number of rollers has been made too small in Figure 3 to simplify the presentation), a pipe shell 21 on top of a straight pipe 20. This pipe shell 21 is in fact intended for the insulation of the pipe part 13 and is therefore pushed axially around the pipe part 13.

59296 In this case, the tube shell 21 further pushes all the wheels 19 placed on the tube so that they protrude around the bend 10 of the tube. When the rollers are pushed onto the pipe bend 10, they are pressed as already described in connection with Fig. 1, and they are formed by the same light pressing from the edge on the inside of the pipe bend 10. Practical experiments have shown that this design, in contrast to a quick review, is very evenly distributed over the entire inner circumference of the pipe bend 10. The use of the method according to the invention avoids all the above-mentioned disadvantages which arise from the previously known method according to patent publication 315 776. The castors are detached during transport to the workplace and can therefore be easily packed in cylindrical packages provided with support rods made of wood or other suitable material to protect against external damage, i.e. unlike the insulating elements according to said patent. They are thus exposed to much less damage during transport and storage. If, nevertheless, the damage had occurred locally to such a rotary pack, then only the damaged rolls need be discarded, while the remainder are fully usable. In the method according to the above-mentioned patent, in the event of such damage, the entire insulating element must be discarded. In addition, there are no difficulties in bending or creasing the protective sheath. Instead, if desired, the rotary insulation made according to the invention can be surrounded by a protective cover. Such sheaths are now manufactured industrially to fit all conventional dimensions of insulated pipe bends.

It should be noted that to simplify the presentation, the seams between the different pipe sections are not drawn in the drawing. These are, of course, of traditional quality.

Claims (1)

A method for thermally insulating pipe bends (10) using mineral wool products (15, 17, 19) for pipe bend insulation, which pipe bends are connected to straight pipe sections (11, 13), at least one of which is already insulated (12), most preferably finished in the form of a tube shell (12) placed and fixed on the tube (11), in which case pre-cut wheels (15, 19) with mineral wool layers in their own plane are placed on the tube bend (10) tightly against each other, characterized in that the wheels (15, 19), which are made of a porous mineral wool mat that can be easily compressed in the axial direction and whose planes are parallel and have substantially the same thickness, are threaded in an uncompressed state by an uninsulated joint connected to one end (14) of the pipe bend (10). on or after connecting the pipe section (13) to the pipe bend (10) and then pushing the same sun With a pipe shell (21) or similar insulation pushed over the pipe section (13) over the pipe bend (10) against the insulation (12) of the straight pipe section (11) connected to its opposite end under such pressure that all levels of the wheels (15, 19) are at least approximately radially parallel to the curvature of the pipe bend (10) and tightly attached to each other. Förfaringssätt för värmeisolering av rörkrökar (10), under nytt-jande av mineralullsprodukter (15, 17, 19) för rörkrökens isolation, vilka rörkrökar är anslutna account raka rördelar (11, 13), av vilka ätminstone den ena redan är isolerad med en (12), for use in the manufacture of heavy-duty spare parts (11), for use in the manufacture of round-rollers (15, 19), for use in the manufacture of round-rollers (15, 19) (10) i dikt anläggning mot varandra, känneteck-n ad av att rondellerna (15, 19), vilka är utförda av en sA porös mineralullsmatta, att de lätt kan komprimeras i axialriktningen, och vilka är planparallella oc har har huvudsak lika tjocklek, i inte compresents tillstAnd träs pA en account rörkrökens (10) ena ände (14) ansluten, inte isolerad rördel (13) före eller efter dennas anslut-Ning account rörkröken (10) och därefter med hjälp av en pA sama raka rördel pAskjuten rörskal (21) eller liknande isolation skjuts