EP1923576B1 - Bend for a fluid duct - Google Patents

Bend for a fluid duct Download PDF

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Publication number
EP1923576B1
EP1923576B1 EP08004098A EP08004098A EP1923576B1 EP 1923576 B1 EP1923576 B1 EP 1923576B1 EP 08004098 A EP08004098 A EP 08004098A EP 08004098 A EP08004098 A EP 08004098A EP 1923576 B1 EP1923576 B1 EP 1923576B1
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EP
European Patent Office
Prior art keywords
duct
pipe bend
circular
piece
flat
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Active
Application number
EP08004098A
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German (de)
French (fr)
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EP1923576A1 (en
Inventor
Hans-Joachim Naber
Wolf-Christoph Friebel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Naber Holding GmbH and Co KG
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Naber Holding GmbH and Co KG
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Publication date
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Application filed by Naber Holding GmbH and Co KG filed Critical Naber Holding GmbH and Co KG
Priority to DE502005009215T priority Critical patent/DE502005009215D1/en
Publication of EP1923576A1 publication Critical patent/EP1923576A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits
    • F15D1/04—Arrangements of guide vanes in pipe elbows or duct bends; Construction of pipe conduit elements for elbows with respect to flow, e.g. for reducing losses of flow

Definitions

  • the invention relates to a pipe bend for fluid channels according to the preamble of claim 1.
  • Such bends are an essential element of fluid channels, which are increasingly used in buildings of all kinds for ventilation, for ventilation, for air conditioning.
  • fluids liquids and gases, including natural gas pipelines or oil pipelines.
  • a preferred application are supply air ducts and in particular exhaust ducts for extractor hoods in modern kitchens.
  • Fluid channels have a certain line resistance, which leads to pressure losses, they require certain cross-sections and drive motors for transport, such as fans; These can be associated with high noise.
  • the aim of the invention is to reduce the pressure loss through the line resistance, and thus the power cross section, or to increase the flow rate, while reducing the noise level and also the motor power required for fluid transport.
  • An essential idea of the invention is to install guide elements in the pipe bends in a very specific manner, so that the fluid flow within the pipe bend is completely subdivided into a plurality of sections, preferably two or three sections.
  • Previous guide elements in pipe bends so in Dubbel, paperback for mechanical engineering, Springer-Verlag Berlin, 1970, DE patent 588113 , or DE-PS 742475 could not contribute anything to this problem solution.
  • the BE 510469 A discloses a pipe bend for fluid channels having a circular cross-section, which has in the interior parallel to the outer and inner wall running extending circular guide surfaces, which are adapted to minimize pipe bends with a continuous circular cross section, the pressure drop in fürflußrichtun.
  • the guide elements according to the invention also referred to as a guide body, reduce the vortex formation and ensure more uniform speed.
  • the sections of the flow guide elements are different.
  • Such pipe bends can also be designed as deflecting pieces between different pipe sections, for example flat-round. All angles of pipe bends are possible, the sharper the angle, the more significant the invention affects; most common are 90 ° angles.
  • FIG. 1 shows a further embodiment of the invention in the form of a deflection piece 80 between a flat channel and a circular channel to allow a connection between flat channels and round channels.
  • the narrower edge 90 of the inner guide element 88 in this case engages slightly in the flange portion 92 of the circular connection piece, which is designed for the sliding over a round duct fitting.
  • These guide elements are thus somewhat more expensive to manufacture, but allow a waiver of a two-part production of the pipe bends.
  • this different type of technology can be used in all possible pipe bends and not only in the deflector shown.
  • FIG. 2 shows the complete connector 80, wherein the flat channel 82 vertically and the circular channel 84 are arranged horizontally. Well visible are the outer baffle 86 and the inner baffle 84. In this embodiment, the exit width of the central channel is about 20 percent wider than the other two channels. The same applies to the area of the flat channel.
  • FIG. 3 shows the cross section through the diverter pipe elbow of FIG. 2 ,
  • the curved outer surface 92 describes, starting from the circular channel connection, substantially initially a circular arc with a large radius and then merges into a flat surface in the direction of the flat channel connection.
  • the outer guide element 86 and the inner guide element 88 have essentially the shape of an ellipse.
  • the channel widths of the flat-channel connection and the round-channel connection are in the same relationship to each other.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Pipe Accessories (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Duct Arrangements (AREA)

Abstract

The elbow (10) has guiding elements (26,27), which are led parallel to each other and to the curved inner walls (29) and external walls (25). The guiding elements with a manifold of a flat channel to a circular channel, exchanges from a flat channel to a circular channel in a straight piece direction flat channel. If required, the external guiding elements have another inner guiding element in elliptical form. The width of circular channel connection is proportionate to flat duct connection.

Description

Die Erfindung bezieht sich auf einen Rohrbogen für Fluidkanäle gemäß dem Oberbegriff des Anspruches 1.The invention relates to a pipe bend for fluid channels according to the preamble of claim 1.

Derartige Rohrbögen sind ein wesentliches Element von Fluidkanälen, die vermehrt in Gebäuden aller Art für die Belüftung, für die Entlüftung, für Klimaanlagen eingesetzt werden. Prinzipiell ist die Anwendung bei allen Fluiden, Flüssigkeit und Gasen möglich, auch für Erdgasleitung oder für Ölleitungen.Such bends are an essential element of fluid channels, which are increasingly used in buildings of all kinds for ventilation, for ventilation, for air conditioning. In principle, it is possible to use it on all fluids, liquids and gases, including natural gas pipelines or oil pipelines.

Eine bevorzugte Anwendung sind Zuluft- und insbesondere Abluftkanäle für Abzugshauben in modernen Küchen.A preferred application are supply air ducts and in particular exhaust ducts for extractor hoods in modern kitchens.

Fluidkanäle haben einen bestimmten Leitungswiderstand, der zu Druckverlusten führt, sie benötigen bestimmte Querschnitte und Antriebsmotoren für den Transport, wie für Ventilatoren; diese können mit hohen Geräuschen verbunden sein.Fluid channels have a certain line resistance, which leads to pressure losses, they require certain cross-sections and drive motors for transport, such as fans; These can be associated with high noise.

Ziel der Erfindung ist, den Druckverlust durch den Leitungswiderstand, und damit den Leistungsquerschnitt zu verringern, oder die Durchflussmenge zu erhöhen, gleichzeitig den Geräuschpegel und auch die für den Fluidtransport erforderliche Motorleistung zu verringern.The aim of the invention is to reduce the pressure loss through the line resistance, and thus the power cross section, or to increase the flow rate, while reducing the noise level and also the motor power required for fluid transport.

Dieses Ziel wird durch die Merkmale des Anspruches 1 gelöst. Weitere Ausgestaltungen der Erfindung sind in den Unteransprüchen unter Schutz gestellt.This object is solved by the features of claim 1. Further embodiments of the invention are provided in the subclaims under protection.

Eine wesentliche Erfindungsidee besteht darin, in den Rohrbögen Leitelemente in ganz bestimmter Weise anzubringen, so dass der Fluidstrom innerhalb des Rohrbogens komplett in mehrere Abschnitte, vorzugsweise zwei oder drei Abschnitte, unterteilt wird,. Bisherige Leitelemente in Rohrbögen so in Dubbel, Taschenbuch für den Maschinenbau, Springer-Verlag Berlin, 1970, DE-Patentschrift 588113 , oder DE-PS 742475 konnten nichts Entscheidendes zu dieser Problemlösung beitragen.An essential idea of the invention is to install guide elements in the pipe bends in a very specific manner, so that the fluid flow within the pipe bend is completely subdivided into a plurality of sections, preferably two or three sections. Previous guide elements in pipe bends so in Dubbel, paperback for mechanical engineering, Springer-Verlag Berlin, 1970, DE patent 588113 , or DE-PS 742475 could not contribute anything to this problem solution.

Die BE 510469 A offenbart einen Rohrbogen für Fluidkanäle mit kreisrundem Querschnitt, der im Innern parallel zur Außen- sowie Innenbewandung verlaufende kreisförmige Leitflächen aufweist, die dazu geeignet sind, bei Rohrbögen mit durchgängig kreisrundem Querschnitt den Druckabfall in Durchflußrichtun zu minimieren.The BE 510469 A discloses a pipe bend for fluid channels having a circular cross-section, which has in the interior parallel to the outer and inner wall running extending circular guide surfaces, which are adapted to minimize pipe bends with a continuous circular cross section, the pressure drop in Durchflußrichtun.

Die erfindungsgemäßen Leitelemente, auch als Leitkörper bezeichnet, verringern die Wirbelbildung und sorgen für gleichmäßigere Geschwindigkeit.The guide elements according to the invention, also referred to as a guide body, reduce the vortex formation and ensure more uniform speed.

Die Verbesserungen sind knapp zusammengefasst:

  • höhere Strömungsleistung
  • - geringerer Energieverbrauch
  • weniger Lärm, z. B. an einer Ablufthaube
  • - größere mechanische Festigkeit
  • - leichtere Montage durch Einführfasen
  • kompaktere Abmessungen, insbesondere geringere Höhe.
The improvements are summarized:
  • higher flow capacity
  • - lower energy consumption
  • less noise, eg. B. on an exhaust hood
  • - greater mechanical strength
  • - easier installation through chamfers
  • more compact dimensions, especially lower height.

Ein Grund, warum sich derartige innere, Leitelemente bisher nicht durchsetzen, könnte auch an den relativ schwierigen Herstellungsproblemen liegen. Nachfolgende Ansprüche zeigen unter anderem spezielle Ausführungsformen einer zweiteiligen Herstellung unterschiedlicher Rohrbögen und spezielle Merkmale des Zusammenfügens dieser zweiteiligen Rohrbögen, sowie vorteilhafte Ausgestaltungen und Anordnungen der Leitelemente und der Endkanten der Anschlussflansche. Dadurch ist zum einen ein sehr rasches, einfaches und präzises Zusammenfügen möglich, zum anderen wird das Strömungsprofil im Inneren der Rohrbögen praktisch nicht beeinflusst, und weiterhin wird für einen festen Halt der beiden miteinander verbundenen Hälften der Rohrbögen gesorgt.One reason why such inner, guiding elements have not yet prevailed could also be due to the relatively difficult production problems. The following claims show, inter alia, specific embodiments of a two-part production of different pipe bends and special features of the assembly of these two-part pipe bends, and advantageous embodiments and arrangements of the guide elements and the end edges of the connection flanges. As a result, on the one hand a very quick, simple and precise assembly is possible, on the other hand, the flow profile is practically unaffected in the interior of the pipe bends, and further provides for a firm grip of the two interconnected halves of the pipe bends.

Je nach Rohrbogen sind die Abschnitte der Strömungs-Leitelemente unterschiedlich. Derartige Rohrbögen können auch als Umlenkstücke zwischen verschiedenen Rohrquerschnitten, beispielsweise Flach-Rund, ausgebildet sein. Alle Winkel von Rohrbögen sind möglich, je spitzer der Winkel, umso bedeutsamer wirkt sich die Erfindung aus; am häufigsten sind 90°-Winkel.Depending on the pipe bend, the sections of the flow guide elements are different. Such pipe bends can also be designed as deflecting pieces between different pipe sections, for example flat-round. All angles of pipe bends are possible, the sharper the angle, the more significant the invention affects; most common are 90 ° angles.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt.Embodiments of the invention are illustrated in the drawing.

Es zeigt:

  • Figur 1 ein Ausführungsbeispiel der Erfindung in Form eines Umlenkstückes zwischen vertikalem Flachkanal und kreisrundem Kanal in perspektivischer Explosionsdarstellung,
  • Figur 2 das Umlenkstück von Figur 1 perspektivisch im zusammengebauten Zustand, wobei auch die unterschiedlichen Kanalbreiten sichtbar werden,
  • Figur 3 den Querschnitt durch das Umlenkstück von Figur 2 entlang der Schnittlinie A-A.
It shows:
  • FIG. 1 An embodiment of the invention in the form of a deflection between vertical flat channel and circular channel in a perspective exploded view,
  • FIG. 2 the deflector of FIG. 1 in perspective in the assembled state, whereby the different channel widths are visible,
  • FIG. 3 the cross section through the deflection of FIG. 2 along the section line AA.

Figur 1 zeigt ein weiteres Ausführungsbeispiel der Erfindung in Form eines Umlenkstückes 80 zwischen einem Flachkanal und einem kreisrunden Kanal, um eine Verbindung zwischen Flachkanälen und Rundkanälen zu ermöglichen. FIG. 1 shows a further embodiment of the invention in the form of a deflection piece 80 between a flat channel and a circular channel to allow a connection between flat channels and round channels.

Bei diesem besonderen Ausführungsbeispiel gibt es einige konstruktive Besonderheiten. So sind hier die beiden, zueinander parallel geführten Leitelemente nicht parallel zur Innenwand beziehungsweise Außenwand. Um ein gleich großes Durchgangsvolumen für das Fluid aufrecht zu erhalten, ergibt sich auch vom Flachkanal zum Rundkanal eine Verjüngung des Kanalabschnittes. Schließlich ist auch keine Herstellung aus zwei Teilstücken vorgesehen, sondern die Anfertigung von kompletten Einsatzteilen 86. 88 mit Seitenabschnitten 87 beziehungsweise 89. Hierbei sind die zwei vorgesehenen Leitelemente als komplette Bauteile 86. 88 mit Seitenwänden 87 bzw. 89 ausgebildet, die als ganzes in den Rohrbogen eingeschoben und verankert werden. Die Seitenwände dieser Leitelemente und die entsprechenden Außenwände des Umlenk-Rohrbogens sind so gestaltet, dass sie im eingebauten Zustand miteinander bündig sind und somit keinen zusätzlichen Wandwiderstand ergeben. Die schmälere Kante 90 des inneren Leitelementes 88 greift hierbei geringfügig in den Flanschbereich 92 des kreisrunden Anschlussstückes ein, der für das Überschieben eines runden Kanal- Anschlussstückes ausgebildet ist. Diese Leitelemente sind somit etwas aufwändiger in der Herstellung, erlauben jedoch einen Verzicht auf eine zweiteilige Herstellung der Rohrbögen. Selbstverständlich ist diese andersartige Technik bei allen möglichen Rohrbögen und nicht nur bei dem gezeigten Umlenkstück einsetzbar.In this particular embodiment, there are some design features. So here are the two, parallel guided guide elements not parallel to the inner wall or outer wall. In order to maintain an equal throughput volume for the fluid, there is also a rejuvenation of the channel section from the flat channel to the circular channel. Finally, too no preparation of two sections provided, but the preparation of complete inserts 86. 88 with side portions 87 and 89. Here are the two provided guide elements as complete components 86. 88 formed with side walls 87 and 89, which are inserted as a whole in the pipe bend and anchored. The side walls of these vanes and the corresponding outer walls of the Umlenk-pipe bend are designed so that they are flush with each other in the installed state and thus give no additional wall resistance. The narrower edge 90 of the inner guide element 88 in this case engages slightly in the flange portion 92 of the circular connection piece, which is designed for the sliding over a round duct fitting. These guide elements are thus somewhat more expensive to manufacture, but allow a waiver of a two-part production of the pipe bends. Of course, this different type of technology can be used in all possible pipe bends and not only in the deflector shown.

Figur 2 zeigt das komplette Anschlussstück 80, wobei der Flachkanal 82 vertikal und der kreisrunde Kanal 84 horizontal angeordnet sind. Gut sichtbar sind das äußere Leitelement 86 und das innere Leitelement 84. Bei diesem Ausführungsbeispiel ist die Austrittsbreite des mittleren Kanales um etwa 20 Prozent breiter als die beiden anderen Kanäle ausgebildet. Ähnliches gilt auch für den Bereich des Flachkanales. FIG. 2 shows the complete connector 80, wherein the flat channel 82 vertically and the circular channel 84 are arranged horizontally. Well visible are the outer baffle 86 and the inner baffle 84. In this embodiment, the exit width of the central channel is about 20 percent wider than the other two channels. The same applies to the area of the flat channel.

Figur 3 zeigt den Querschnitt durch den Umlenkstück-Rohrbogen von Figur 2. Hier sind insbesondere die genauen Krümmungen von Außenwandung 92, äußerem Leitblech 86, innerem Leitblech 88, das in den Flanschbereich des Rundanschlusses 84 geringfügig hineinragt. FIG. 3 shows the cross section through the diverter pipe elbow of FIG. 2 , Here, in particular, the precise curvatures of outer wall 92, outer guide plate 86, inner guide plate 88, which protrudes slightly into the flange region of the round terminal 84.

Die gekrümmte Außenfläche 92 beschreibt, ausgehend vom kreisrunden Kanalanschluss, im Wesentlichen zunächst einen Kreisbogen mit großem Radius und geht dann in eine ebene Fläche in Richtung zum Flachkanalanschluss über. Das äußere Leitelement 86 und das innere Leitelement 88 haben im Wesentlichen die Form einer Ellipse. Die Kanalbreiten des Flachkanal-Anschlusses und des Rundkanal-Anschlusses stehen hierbei im gleichen Verhältnis zueinander.The curved outer surface 92 describes, starting from the circular channel connection, substantially initially a circular arc with a large radius and then merges into a flat surface in the direction of the flat channel connection. The outer guide element 86 and the inner guide element 88 have essentially the shape of an ellipse. The channel widths of the flat-channel connection and the round-channel connection are in the same relationship to each other.

Claims (5)

  1. Pipe bend for fluid ducts with rigid fluid directing elements (86, 88), in particular for air inlet and exhaust ducts, in particular for kitchens, with a transition piece (80) from flat duct (82) to circular duct (84), characterised in that the directing elements (86, 88) are essentially elliptical in shape and do not run parallel to the inner wall or outer wall respectively and also transition into a straight piece (87, 89) in the direction of the flat duct, and that the duct widths of the circular duct connection (84) and of the flat duct connection (82) are proportional to each other.
  2. Pipe bend according to claim 1, characterised in that the pipe bend is a deflection piece (80) from a vertical flat duct (82) to a circular duct (84), in which the preferably two directing elements (86, 88) run equidistantly or with an approximately 10 to 30% wider inner duct.
  3. Pipe bend according to claim 2, characterised in that the two elliptical directing elements (86, 88) run from the circular connection piece to the flat duct connection piece, and that alternatively the curved outer surface (92) likewise runs elliptically or is attached to the circular connection piece (84) firstly as a circular arc with a large radius and then transitions in the direction of the flat duct into a straight planar piece, the proportions of the duct widths in the circular connection piece and in the flat duct connection piece being essentially identical, and the middle duct preferably being some 10 to 30% wider than the two outer ducts.
  4. Pipe bend according to one of the preceding claims, characterised in that the pipe bend is formed all in one piece and that the directing elements (86, 88) are pushed into the pipe bend and attached thereto so as to form a seal, by welding or luting.
  5. Pipe bend according to claim 4, characterised in that the side walls (87, 89) of the directing elements (86, 88) can be inserted and fixed in corresponding recesses (83) on the inner wall of the pipe bend or in outwardly extending protrusions so as to produce a planar inner surface of the pipe bend.
EP08004098A 2005-11-16 2005-11-16 Bend for a fluid duct Active EP1923576B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE502005009215T DE502005009215D1 (en) 2005-11-16 2005-11-16 Pipe bend for fluid channels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05024982.0A EP1788259B2 (en) 2005-11-16 2005-11-16 Bend for a fluid duct

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP05024982.0 Division 2005-11-16
EP05024982.0A Division-Into EP1788259B2 (en) 2005-11-16 2005-11-16 Bend for a fluid duct
EP05024982.0A Division EP1788259B2 (en) 2005-11-16 2005-11-16 Bend for a fluid duct

Publications (2)

Publication Number Publication Date
EP1923576A1 EP1923576A1 (en) 2008-05-21
EP1923576B1 true EP1923576B1 (en) 2010-03-10

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ID=36177659

Family Applications (2)

Application Number Title Priority Date Filing Date
EP05024982.0A Active EP1788259B2 (en) 2005-11-16 2005-11-16 Bend for a fluid duct
EP08004098A Active EP1923576B1 (en) 2005-11-16 2005-11-16 Bend for a fluid duct

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP05024982.0A Active EP1788259B2 (en) 2005-11-16 2005-11-16 Bend for a fluid duct

Country Status (4)

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EP (2) EP1788259B2 (en)
AT (1) ATE460588T1 (en)
DE (1) DE502005009215D1 (en)
ES (2) ES2543590T5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021113234A1 (en) 2021-05-21 2022-11-24 Naber Holding Gmbh & Co. Kg Pipe bend for an exhaust air duct of an extractor hood

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CN102155478A (en) * 2011-04-28 2011-08-17 唐力南 Bend pipe flow rate regulator
DE202017105556U1 (en) * 2017-09-14 2017-09-26 Naber Holding Gmbh & Co. Kg Flat channel connector for a flat channel and a corresponding channel arrangement
CN112983846A (en) 2019-12-02 2021-06-18 开利公司 Centrifugal compressor and method for operating a centrifugal compressor
CZ2020381A3 (en) * 2020-06-29 2021-08-25 Oil&Gas Metering Equipment S.R.O. Gas flow deflector in a flow bend for an ultrasonic gas meter
DE202021101741U1 (en) 2021-03-31 2021-04-15 Naber Holding Gmbh & Co. Kg Flat duct arrangement for a downdraft extractor hood
DE102021113249B4 (en) 2021-05-21 2023-04-27 Naber Holding Gmbh & Co. Kg Pipe bend for an exhaust air duct of an extractor hood
DE102021113244A1 (en) * 2021-05-21 2022-11-24 Naber Holding Gmbh & Co. Kg Downdraft Element and Arrangement
CN115419616A (en) * 2022-09-05 2022-12-02 江森自控空调冷冻设备(无锡)有限公司 Air suction pipe of centrifugal compressor

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GB509287A (en) * 1938-05-23 1939-07-13 Neu Sa Improvements relating to apparatus for distributing humidified air
DE742475C (en) 1939-10-29 1944-06-02 Focke Wulf Flugzeugbau G M B H Elbow
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021113234A1 (en) 2021-05-21 2022-11-24 Naber Holding Gmbh & Co. Kg Pipe bend for an exhaust air duct of an extractor hood
DE102021113234B4 (en) 2021-05-21 2022-12-15 Naber Holding Gmbh & Co. Kg Pipe bend for an exhaust air duct of an extractor hood

Also Published As

Publication number Publication date
ES2543590T3 (en) 2015-08-20
EP1788259B2 (en) 2018-09-19
ES2543590T5 (en) 2018-11-02
ES2343388T3 (en) 2010-07-29
EP1923576A1 (en) 2008-05-21
ATE460588T1 (en) 2010-03-15
EP1788259A1 (en) 2007-05-23
DE502005009215D1 (en) 2010-04-22
EP1788259B1 (en) 2015-07-22

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