DE902863C - Hollow pipe with plastic jacket - Google Patents
Hollow pipe with plastic jacketInfo
- Publication number
- DE902863C DE902863C DEA9804D DEA0009804D DE902863C DE 902863 C DE902863 C DE 902863C DE A9804 D DEA9804 D DE A9804D DE A0009804 D DEA0009804 D DE A0009804D DE 902863 C DE902863 C DE 902863C
- Authority
- DE
- Germany
- Prior art keywords
- plastic jacket
- hollow pipe
- pipe
- braiding
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/12—Hollow waveguides
- H01P3/14—Hollow waveguides flexible
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Description
Hohlrohrleitung mit Kunststoffmantel Unter der Warenbezeichnung Kopexrohre sind Rohre bekanntgeworden, welche etwa nach folgendem Verfahren hergestellt werden: Auf einen Dorn werden mehrere Bänder aus Metall oder Faserstoff schraubenlinienförmig aufgewickelt. Das so entstandene Rohr wird dann zwischen zwei Werkzeugen mit Rillen versehen und zusammengestaucht, wodurch sich ein biegsames und gleichwohl formfestes Rohr ergibt. Es wurde gefunden, daß sich derartige Druckfaltenrohre, besonders wenn ihre Innenfläche mit einem gut leitenden Belag versehen werden kann, zur Übertragung von kurzen elektrischen Wellen, insbesondere Zentimeterwellen, eignen. Es hat sich indessen herausgestellt, daß die ungeschützten Druckfaltenrohre noch eine Reihe von kleinen Nachteilen aufweisen. So besteht beispielsweise die Gefahr der Korrosion der meist aus Eisenbändern hergestellten Druckfaltenrohre. Ferner ist es erwünscht, den Rohren eine höhere Feuchtigkeits- und Gasdichtigkeit zu verleihen. Bei Verwendung im Freien hat sich weiterhin gezeigt, daß es zweckmäßig sein kann, die Hohlrohrleitung mit einem neutralen Gas unter Überdruck zu füllen, um der Bildung von Kondenswasser bei starken Temperaturschwankungen vorzubeugen. Häufig ist auch die Biegsamkeit der üblichen Druckfaltenrohre größer, als es für die Fortpflanzung kürzester Wellen in Rohren zweckmäßig ist, so daß eine Erhöhung der Steifigkeit des Rohres angebracht erscheint. Um alle diese Nachteile zu beseitigen, wird erfindungsgemäß vorgeschlagen, über das Druckfaltenrohr einen Kunststoffmantel zu pressen. Als Werkstoff hat sich besonders Polyvinylchlori.d bewährt. Ein Mantel aus Polyvinylchlorid kann nach dem Spritzverfahren um das Druckfaltenrohr herumgepreßt werden. Die Falten .des Rohres werden dabei nicht vom Kunststoff ausgefüllt. Falls es gewünscht wird, kann man das Verfahren aber auch so leiten, daß der Kunststoff in die Falten des Rohres eindringt, wodurch sich allerdings eine erhebliche Versteifung des Rohres ergibt, die in den meisten Fällen über das gewünschte Maß hinausgeht.Hollow pipeline with plastic jacket under the trade name Kopexrohre Pipes have become known which are manufactured according to the following process: Several strips of metal or fiber are formed helically on a mandrel wound up. The resulting pipe is then grooved between two tools provided and compressed, resulting in a flexible and nonetheless dimensionally stable Pipe results. It has been found that such pressure bellows tubes, especially if its inner surface can be provided with a highly conductive coating for transmission of short electrical waves, especially centimeter waves. It has however, it was found that the unprotected pressure folding tubes still have a number have small disadvantages. For example, there is a risk of corrosion of the compression tubes, which are usually made of iron strips. It is also desirable to give the pipes a higher moisture and gas tightness. Using outdoors it has also been shown that it can be useful to use the hollow pipeline Fill with a neutral gas under positive pressure to prevent the formation of condensation to prevent severe temperature fluctuations. Flexibility is also common the usual compression tubes larger than it is for the propagation of the shortest waves in pipes is appropriate, so that an increase in the rigidity of the pipe is appropriate appears. In order to eliminate all of these disadvantages, the invention proposed to press a plastic jacket over the pleated tube. As a material Polyvinylchlori.d has proven particularly useful. A sheath made of polyvinyl chloride can be pressed around the pressure bellows tube after the injection molding process. The wrinkles .of the pipe are not filled with plastic. If it is desired, but you can also direct the process so that the plastic in the folds of the Penetrates the pipe, which, however, results in a considerable stiffening of the pipe results, which in most cases goes beyond what is desired.
Falls die Hohlrohrleitung mit Gas von höherem Druck gefüllt werden soll, empfiehlt es sich, über dem Kunststoffmantel noch eine Bebänderung, Umflechtung oder Umklöppelung anzubringen, um einer Aufweitung des Mantels vorzubeugen.In case the hollow pipeline is filled with gas of higher pressure it is advisable to put a banding or braid over the plastic jacket or to attach braiding to prevent expansion of the jacket.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA9804D DE902863C (en) | 1944-06-27 | 1944-06-27 | Hollow pipe with plastic jacket |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA9804D DE902863C (en) | 1944-06-27 | 1944-06-27 | Hollow pipe with plastic jacket |
Publications (1)
Publication Number | Publication Date |
---|---|
DE902863C true DE902863C (en) | 1954-01-28 |
Family
ID=6921869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA9804D Expired DE902863C (en) | 1944-06-27 | 1944-06-27 | Hollow pipe with plastic jacket |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE902863C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1034729B (en) * | 1957-07-10 | 1958-07-24 | Siemens Ag | Waveguide system for the transmission of tubular waves |
DE1063234B (en) * | 1954-05-28 | 1959-08-13 | Siemens Ag | Self-supporting hollow wire waveguide for the transmission of surface waves, whose conductor currents have axial and radial current components |
DE1091640B (en) * | 1955-08-31 | 1960-10-27 | Siemens Ag | Waveguide for magnetic hollow tube shafts with an electric circular field, especially for an H-wave |
-
1944
- 1944-06-27 DE DEA9804D patent/DE902863C/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1063234B (en) * | 1954-05-28 | 1959-08-13 | Siemens Ag | Self-supporting hollow wire waveguide for the transmission of surface waves, whose conductor currents have axial and radial current components |
DE1091640B (en) * | 1955-08-31 | 1960-10-27 | Siemens Ag | Waveguide for magnetic hollow tube shafts with an electric circular field, especially for an H-wave |
DE1034729B (en) * | 1957-07-10 | 1958-07-24 | Siemens Ag | Waveguide system for the transmission of tubular waves |
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