DE7830248U1 - THERMAL INSULATED PIPE - Google Patents

Description

03 3

Grünzweig + Hartmann Montage GmbH P 650 D and GM Westendstr. 17th

TE-ND2 f-st 6700 Ludv / igshafen / Rhein 04.10.1978

Applicant: GRÜNZWEIG + HARTMANN MONTAGE GMBH 6700 Ludwigshafen am Rhein

Thermally insulated pipe

Thermally insulated, in particular metallic tube with a tube jacket held at a distance by a centering ring. Such pipelines have the disadvantage that with constant occurrence of different temperature differences between the conveyed medium and the outside air, condensation water arises on the inside of the pipe casing. This leads to moisture penetration of the thermal insulation and thus to the impairment of the thermal insulation effect. The reason for this lies in the fact that when the air space cools down between the pipe and the pipe jacket, a negative pressure is created through which the outside air is sucked in and, when the air space is heated, is conveyed out again due to the overpressure _o The constant pumping in and out of the air creates moisture brought into the interior of the thermal insulation layer, which then leads to condensation.

• t · · fl lilt It 11 I I) . · ■ · Il Ϊ I 1_-1 1 J

> I r,

tft * l · ··

- 2 - P 650 D and GM 870

Various measures have been proposed to overcome this disadvantage. For example, an attempt was made to improve the thermal insulation or to seal the pipe casing completely against the ingress of moisture. To do this will be Various casings or cladding, e.g. those made of bituminized material, plastic, sheet metal or the like., related. These designs have been unsatisfactory because they are either very expensive or not were to be made sufficiently vapor-tight.

It has also already been proposed to use one consisting essentially of mineral wool, glass wool or the like impregnate porous insulating coating with one or more corrosion inhibitors, which upon entry of water pass into these and thus protect the metal surface from corrosion. Grant such thermal insulation in most cases a good protection of the metallic surface, however, require as a starting material for the Coating of specially impregnated mineral fibers.

Another solution to eliminate the disadvantages already mentioned, i.e. a soaking of the thermal insulation, was in accordance with the German utility model 66 06 753 found that preferably at the highest and lowest Openings or drains that can be shut off at the point of the line have been provided. Through these drainage facilities the thermal insulation could be dried out by blowing in compressed air or - if the metal surface is hot "Evaporation" of the insulating coating. This process is cumbersome and requires the presence of operating personnel .

According to the innovation, these disadvantages are to be eliminated by that the pipe casing at the lower apex has at least one non-closable opening for ventilation of the annular space having between thermal insulation and pipe sheathing. The opening

• <* ItI I (t

• ■> Ii ι f ι ι ι t

• · III 1 II i

- 3 - P 650 D and GM

can consist of one or more bores or slots. If condensation occurs that is on the inside of the outer pipe - i.e. on the warm side of the with the colder medium (outside air) in If the pipe comes into contact with it - it precipitates, it can flow away automatically through the openings.

In a preferred embodiment it is provided that the opening is preferably through two vertically downwards pointing folds is formed, which end in front of the two pipe ends at a distance. This makes a proportionate good rear ventilation and optimal stiffening of the outer tube is achieved. Have attempts already shown that the optimal effect can be achieved by this design. The ones at the ends of the The casing that remains closed on the outer tube is screwed to the substructure next to the folded edges, to get a ring network.

In order to make the assembly of the pipe jacket on the spot efficient, it is provided that the centering ring between thermal insulation and pipe sheathing consists of an initially finite strip on which at least three V-shaped spacers are attached, the width of which f

I is less than the width of the centering strip. The | Due to the larger width, the remaining strips without spacers are used to apply a tensioning band in order to be able to press the centering ring better against the inner pipe or the thermal insulation and to be able to connect the two ends in this position. The ends can then be connected to one another by screws, pop rivets or spot welds. Conceivable would be | also that the two ends have recesses which mutually act like barbs, so that when the band is tensioned, the ends automatically snap into one another at the same time.

• ■ ■ I Il I I 1 I Il. t / .. · ■

• ι · ici i

■ iiict »·····! :

lllliliaaii Ali

1 Il ti Il i * t ·. · Il

- 4 - P 650 D and GM 870

Further details of the invention can be found in the drawings and the following description.

Show it

Fig. 1 one end of the thermally insulated pipe in perspective

Fig. 2 is a front view of the thermally insulated pipe.

The thermally insulated, in particular metallic pipe 1 has essentially a thermal insulation 2, several centering rings 3, a pipe casing 4, through which an annular space 5 between Thermal insulation and pipe casing results, as well as non-closable openings 6 at the lower apex of the pipe casing on. The non-closable opening 6 is considered to be essential to the invention, since it results in constant ventilation of the annular space 5, i.e. a constant ventilation of the pipe casing 4, is given. The best effect is achieved when the opening 6 - as can be seen from FIG. 1 - by preferably two vertically downwardly pointing bevels 6a is formed. The downwardly pointing "tabs" of the folds 6a can also be arranged at an angle to one another so that they diverge downwards, for example. Furthermore, it is provided according to the invention that the centering ring 3 consists of an initially finite strip 3a on which at least three V-shaped spacers 3b are attached, whose width b is less than the width B of the strip 3a. In a preferred embodiment, there should be five V-shaped spacers 3b be arranged so that a V-shaped spacer 3b is at the top of the pipe jacket. This is supposed to be an impression of the sheet metal jacket with vertical, e.g. gravitational loading, can be avoided. The measure achieves that the centering ring remaining free from the spacers can be grasped by a clamping device, so that the assembly this is made much easier.

Claims (3)

P 650 D and GM claims 1. Thermally insulated, in particular metallic tube with a spaced apart by a centering ring Pipe casing, characterized in that the pipe casing (4) is at the lower apex at least one non-closable opening (6) for ventilation of the annular space (5) between the thermal insulation (2) and tubular casing (4). 2. Thermally insulated pipe according to claim 1, characterized characterized in that the opening (6) by preferably zv / ei vertically downwardly facing bevels (6a) which end in front of the two pipe ends at a distance (A). 3. Thermally insulated pipe according to claim 1 or 2, characterized in that the centering ring (3) consists of an initially finite strip (3a) on which at least three V-shaped spacers (3b) are attached, the width (b) of which is less than the width (B) of the strip (3a) is. Till I I to φ X I t It t 4'1 ' Ii ι -κ t .ι ι r Φ 4 ι ι χ t * t -t I. 11 ItID * J 1 1