Pipes and tubular conduits – Distinct layers – Spaced
Patent
1985-06-25
1987-09-22
Marcus, Stephen
Pipes and tubular conduits
Distinct layers
Spaced
138113, F16L 5906
Patent
active
046948651
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a conduit for the transport of liquid and/or gaseous media or suspensions, comprising at least one media pipe preferably consisting of metal or plastics and at least one envelope, with the media pipe arranged so as to be axially displaceable inside the envelope or envelopes on sliding parts or members that provide an air gap separating the envelope from the media pipe. The axial displaceability is not essential in the finally placed conduit composed of several elements and not in the individual elements. It is necessary, above all, for the insertion of the media pipe into the inner space of the envelope during the production of the elements of the conduit.
BACKGROUND OF THE INVENTION
Conduits of this type are mainly used for the transport of media requiring thermal insulation or those thermal insulation is useful, such as, for instance, in pipelines for distant heating, coolants or mineral oil. The sliding parts or members prevent thermal bridges between the envelope and the media pipe. The envelope is normally provided with an outer protective pipe, consisting, for instance, of cement containing fibers or asbestos, of concrete, plastics, ceramics material, metal or the like. Connected to the outer protective pipe can be a central inner pipe or several such inner pipes distributed over the cross section of the other protective pipe. The cavity between the outer protective pipe and the inner pipe is filled with an elastic foam of plastics material, preferably polyurethane foam, for instance, whereby a strong envelope with a correctly positioned cavity for receiving the media pipe is formed. The envelope has particularly good thermal insulating properties and an additional thermal insulation is provided by the air gap between the envelope and the media pipe. A conduit of this type is described in the publication WO 83/01824.
The known conduit described there has the disadvantage that the installation of the sliding parts securing the air gap between the media pipe and the envelope is comparatively elaborate. Each sliding part is formed as an individual skid in the shape of an undulating band forming inner and outer supporting surfaces. Several such skids must be distributed in the proper position around the respective cross section of the media pipe and tightened there by means of a common tightening strap on the outer periphery of the media pipe. The tightening of the skids along the supporting surfaces abutting the media pipe moreover results in a certain transfer of heat via the skids.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a conduit in which the air gap between the media pipe and the envelope is secured in a simpler manner. In a conduit of the type initially mentioned, it consists in that the sliding parts of members are held at the joints of the individual elements of the envelope and preferably extend with a radially outer segment between the elements and form a support for the media pipe together with a radially inner segment. By this arrangement of the sliding parts, these are secured against axial displacement and their fastening is essentially simplified. In an envelope provided with a layer of polyurethane foam, they can be formed or inserted in this layer; in an envelope with an inner pipe, they can abut with one shoulder on its end or tightly grip its circumference. Moreover, there is the possibility to shape the sliding parts or members so that they also serve for centering the elements of the envelope abutting at the joints. This is particularly important in conduits having several media pipes arranged eccentrically within the envelope, as the elements of the envelope in this case must abut one another in the proper rotating position.
Preferably, one single annular sliding part or member is inserted at each joint of the elements of the envelope. In this case, the fastening in the proper position on the envelope is particularly simple.
In a conduit having an envelope formed in a manner known per se with a layer of plastics foam proje
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Marcus Stephen
Peters Leo
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