CH674669A5 - Sharp return bend mfr. - by pushing heated end of thermoplastic tube over heated mandrel - Google Patents
Sharp return bend mfr. - by pushing heated end of thermoplastic tube over heated mandrel Download PDFInfo
- Publication number
- CH674669A5 CH674669A5 CH1605/88A CH160588A CH674669A5 CH 674669 A5 CH674669 A5 CH 674669A5 CH 1605/88 A CH1605/88 A CH 1605/88A CH 160588 A CH160588 A CH 160588A CH 674669 A5 CH674669 A5 CH 674669A5
- Authority
- CH
- Switzerland
- Prior art keywords
- hollow mandrel
- heated
- pipe
- tube
- mandrel
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
- F28F21/062—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing tubular conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/14—Clamps for work of special profile
- B25B5/147—Clamps for work of special profile for pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/08—Bending or folding of tubes or other profiled members
- B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/041—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
To produce a return bend with a very small radius of curvature on thermoplastic tubes, e.g. for use as a terrestrial heat exchanger in deep boreholes, the end of the thermoplastic tube (8) is heated to make it capable of being formed and pushed over a hollow metal mandrel (3). The latter is fixed to a holding bar (1) by a clamping cone (4,5,9). The mandrel is preferably also heated to 80 deg.C. To heat a polyethylene tube (8) to 130 deg.C, it is dipped into an antifrogen bath. ADVANTAGE - This forms a return bend with no joint, compared with the conventional method where two 90 deg. elbows need three butt joints.
Description
BESCHREIBUNG
Die vorliegende Erfindung betrifft ein Verfahren zum Erzeugen von Rohrbogen gemäss dem Oberbegriff des Patentanspruches 1 und eine Einrichtung zur Durchführung des Verfahrens.
Für verschiedene Anwendungen ist es erforderlich, zwei Kunststoffrohre von beliebiger Länge durch einen 180 - Bogen mit sehr engem Radius miteinander zu verbinden.
Derartig verbundene Rohre können z. B zu Rohrbündeln zusammengefasst werden, die als Erdsonde einen Wärmetauscher bilden, mit dem dem Erdinnern Wärme entzogen und einem Heizungssystem zugeführt wird. Aus Kostengründen werden für das Versenken der in vielen Fällen mehr als 100 m langen Sonden möglichst keine Bohrlochdurchmesser (üblich sind 120 mm) gewählt. Der minimale Bohrlochdurch- messer ist abhängig vom Durchmesser des verwendeten Rohres, der Anzahl Rohre der Sonde und speziell vom Radius der Verbindungsbogen. Die Verbindungsstellen zwischen Rohr und Verbindungsbogen sowie der Verbindungsbogen selbst sind insbesondere beim Versenken der Erdsonde erhöhten mechanischen Belastungen ausgesetzt. Eine erhöhte Festigkeit des Verbindungsbogens und ein Minimum an Verbindungsstellen sind deshalb anzustreben.
Haarnadelförmig ausgebildete Rohre aus Kunststoff werden normalerweise hergestellt, indem die zwei Rohrenden mit zwei handelsüblichen 90 -Bogen verbunden werden (Fig. 1), die ihrerseits miteinander zu verbinden sind.
Nachteilig bei diesem Verfahren ist, dass im Bereich des Rohrbogens drei Verbindungsstellen 10 entstehen.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, einen Rohrbogen mit hoher Festigkeit und kleinem Biegeradius zu schaffen. Die Lösung dieser Aufgabe gelingt erfindungsgemäss mit einem Verfahren wie es im Anspruch 1 gekennzeichnet ist, und einer Einrichtung zur Durchführung des Verfahrens gemäss Anspruch 7. Vorteilhafte Weiterbildungen der Erfindung sind in weiteren Ansprüchen angegeben.
Vorteile des Verfahrens sind: a) es ergeben sich keine Verbindungsstellen im Bereich des Rohrbogens, b) nach dem Verbinden des gebogenen Rohres mit einem Rohrgegenstück ergibt sich insgesamt nur eine Verbindungsstelle, c) der Rohrbogen weist eine erhöhte Festigkeit auf, da der verwendete Hohldorn im Rohrbogen verbleibt.
Anhand einer Zeichnung wird die Erfindung nachfolgend beispielsweise erläutert. Dabei zeigt:
Fig. 1 die eingangs erwähnte bekannte Methode
Fig. 2 eine Einrichtung
Fig. 2 zeigt eine Festhaltevorrichtung, die sich wie folgt zusammensetzt: Eine Haltestange 1 wird in einem Klemmwerkzeug 6 eingespannt. Ein Ende der Haltestange list konisch angeschrägt. In der Spitze des Konus 9 ist axial ein Gewinde passend zu einer Verbindungsschraube 5 eingelassen, mit der ein Klemmkonus 4 aufgeschraubt ist. Die Aussendurchmesser der Haltestange 1 und des Klemmkonus 4 sind gleich und entsprechen knapp dem Innendurchmesser eines entsprechend dem gewünschten Biegeradius gebogenen Hohldorns 3. Der Klemmkonus 4, welcher im Bereich seines Konus axial verlaufende Schlitze 7 aufweist, wird auf die Haltestange 1 festgeschraubt, bis er sich leicht ausweitet.
Dadurch wird der Hohldorn 3 beim Aufschieben auf den Klemmkonus 4 schwach festgeklemmt. Durch eine anschliessende Drehung des Hohldorns 3 um beispielsweise 900 nach rechts werden der Klemmkonus 4 und die Schraube 5 ebenfalls um denselben Betrag gedreht. Dieses Anziehen der Schraube 5 bewirkt eine weitere Dehnung des Klemmkonus 4, wodurch der Hohldorn 3 endgültig fixiert wird.
Diese Einrichtung ermöglicht demnach eine schnelle Fixierung eines in vielen Fällen vorzugsweise vorgewärmten Hohldorns 3. Zusätzlich kann auf die Haltestange 1 ein Kalibrierrohr 2 aufgeschoben werden. Das Kalibrierrohr 2 weist denselben Aussendurchmesser auf wie der Hohldorn 3.
Am Ende eines thermoplastischen Rohres 8 wird mit dieser Einrichtung nun folgendermassen ein Rohrbogen erzeugt: Das Ende des Rohres 8 wird auf seine Verarbeitungs- temperatur erwärmt, so dass es plastisch formbar wird.
Sodann wird es auf das freie Ende des Hohldorns 3 aufgeschoben, bis dessen 180 -Bogen überzogen ist. Falls der Rohrbogen zum Erzeugen von haarnadelförmigen Rohrelementen mit einem Rohrgegenstück verbunden werden soll, wird das gewärmte Rohr 8 über den Hohldorn 3 hinaus auf das an den Hohldorn 3 anschliessende Kalibrierrohr 2 geschoben, welches dafür sorgt, dass das Rohr 8 seinen Innendurchmesser nach dem Erkalten beibehält. Zum gleichmässigen Erwärmen des Rohres 8 eignen sich Flüssigkeiten, die ihren Siedepunkt über der Verarbeitungstemperatur des thermoplastischen Werkstoffes des Rohres 8 haben.
Zur Erwärmung von Polyäthylenrohren eignet sich z. B.
Antifrogen, das auf ca. 130 C erwärmt wird.
Um eine vorzeitige Abkühlung des Rohres 8 schon beim Aufschieben zu verhindern, kann der Hohldorn 3 vor dessen Montage ebenfalls erwärmt werden. Falls der Hohldorn 3 ein Metallrohr ist, wird dieses auf ca. 800C erwärmt. Nach dem Abkühlen wird der Rohrbogen von der Haltestange 9 abgezogen, wobei der Hohldorn 3 im Rohrbogen verbleibt.
DESCRIPTION
The present invention relates to a method for producing elbows according to the preamble of claim 1 and a device for performing the method.
For various applications it is necessary to connect two plastic pipes of any length with a 180-bend with a very small radius.
Such connected pipes can, for. B can be combined to form tube bundles, which, as an earth probe, form a heat exchanger with which heat is extracted from the interior of the earth and fed to a heating system. For reasons of cost, no borehole diameters (120 mm are usual) are chosen to sink the probes, which in many cases are more than 100 m long. The minimum borehole diameter depends on the diameter of the pipe used, the number of pipes in the probe and especially the radius of the connecting bend. The connection points between the pipe and the connection bend as well as the connection bend itself are exposed to increased mechanical loads, particularly when the earth probe is sunk. An increased strength of the connection arch and a minimum of connection points should therefore be aimed for.
Plastic hairpin-shaped tubes are usually produced by connecting the two tube ends with two commercially available 90-bends (FIG. 1), which in turn are to be connected to one another.
A disadvantage of this method is that three connection points 10 are created in the area of the pipe bend.
The present invention is therefore based on the object of creating a pipe bend with high strength and a small bending radius. This object is achieved according to the invention with a method as characterized in claim 1 and a device for carrying out the method according to claim 7. Advantageous developments of the invention are specified in further claims.
Advantages of the method are: a) there are no connection points in the area of the pipe bend, b) after connecting the bent pipe with a pipe counterpart, there is only one connection point overall, c) the pipe bend has an increased strength, since the hollow mandrel used in Elbow remains.
The invention is explained below using a drawing, for example. It shows:
Fig. 1, the known method mentioned above
Fig. 2 shows a device
2 shows a holding device which is composed as follows: A holding rod 1 is clamped in a clamping tool 6. One end of the handrail is tapered. In the tip of the cone 9, a thread is axially inserted to match a connecting screw 5 with which a clamping cone 4 is screwed on. The outer diameter of the holding rod 1 and the clamping cone 4 are the same and correspond almost to the inner diameter of a hollow mandrel 3 which is bent in accordance with the desired bending radius easily expands.
As a result, the hollow mandrel 3 is weakly clamped when pushed onto the clamping cone 4. By a subsequent rotation of the hollow mandrel 3 by 900 for example to the right, the clamping cone 4 and the screw 5 are also rotated by the same amount. This tightening of the screw 5 causes the clamping cone 4 to expand further, as a result of which the hollow mandrel 3 is finally fixed.
This device accordingly enables rapid fixing of a hollow mandrel 3, which is preferably preheated in many cases. In addition, a calibration tube 2 can be pushed onto the holding rod 1. The calibration tube 2 has the same outside diameter as the hollow mandrel 3.
At the end of a thermoplastic pipe 8, a pipe bend is now produced with this device as follows: The end of the pipe 8 is heated to its processing temperature, so that it can be shaped plastically.
Then it is pushed onto the free end of the hollow mandrel 3 until its 180 arc is covered. If the pipe bend for producing hairpin-shaped pipe elements is to be connected to a pipe counterpart, the heated pipe 8 is pushed beyond the hollow mandrel 3 onto the calibration pipe 2 adjoining the hollow mandrel 3, which ensures that the pipe 8 maintains its inner diameter after cooling . Liquids which have their boiling point above the processing temperature of the thermoplastic material of the tube 8 are suitable for uniform heating of the tube 8.
For heating polyethylene pipes is suitable for. B.
Antifrogen, which is heated to approx. 130 C.
In order to prevent premature cooling of the tube 8 when it is pushed on, the hollow mandrel 3 can also be heated before it is installed. If the hollow mandrel 3 is a metal tube, it is heated to approx. After cooling, the pipe bend is pulled off the holding rod 9, the hollow mandrel 3 remaining in the pipe bend.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1605/88A CH674669A5 (en) | 1988-04-29 | 1988-04-29 | Sharp return bend mfr. - by pushing heated end of thermoplastic tube over heated mandrel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1605/88A CH674669A5 (en) | 1988-04-29 | 1988-04-29 | Sharp return bend mfr. - by pushing heated end of thermoplastic tube over heated mandrel |
Publications (1)
Publication Number | Publication Date |
---|---|
CH674669A5 true CH674669A5 (en) | 1990-06-29 |
Family
ID=4214331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1605/88A CH674669A5 (en) | 1988-04-29 | 1988-04-29 | Sharp return bend mfr. - by pushing heated end of thermoplastic tube over heated mandrel |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH674669A5 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078905A1 (en) * | 2002-02-19 | 2003-09-25 | Rehau Ag+Co | Earth probe |
DE102007051674A1 (en) * | 2007-10-26 | 2009-04-30 | Rehau Ag + Co. | Method for deforming pipes |
CZ300423B6 (en) * | 2005-08-26 | 2009-05-13 | VKP Melník s. r. o. | Pipe bracket of underground heat exchanger |
CN106958698A (en) * | 2017-05-10 | 2017-07-18 | 安徽新富地能源科技有限公司 | A kind of perpendicularly buried pipe for buried guard system returns plain adapter |
DE202018104584U1 (en) * | 2018-08-09 | 2019-11-20 | Rehau Ag + Co | Rod resistant pipe fitting |
-
1988
- 1988-04-29 CH CH1605/88A patent/CH674669A5/en not_active IP Right Cessation
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078905A1 (en) * | 2002-02-19 | 2003-09-25 | Rehau Ag+Co | Earth probe |
CZ300423B6 (en) * | 2005-08-26 | 2009-05-13 | VKP Melník s. r. o. | Pipe bracket of underground heat exchanger |
DE102007051674A1 (en) * | 2007-10-26 | 2009-04-30 | Rehau Ag + Co. | Method for deforming pipes |
WO2009053033A2 (en) | 2007-10-26 | 2009-04-30 | Rehau Ag + Co | Method for deforming tubes |
WO2009053033A3 (en) * | 2007-10-26 | 2010-02-04 | Rehau Ag + Co | Method for deforming tubes |
CN106958698A (en) * | 2017-05-10 | 2017-07-18 | 安徽新富地能源科技有限公司 | A kind of perpendicularly buried pipe for buried guard system returns plain adapter |
DE202018104584U1 (en) * | 2018-08-09 | 2019-11-20 | Rehau Ag + Co | Rod resistant pipe fitting |
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Legal Events
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PL | Patent ceased |