EP0133253B1 - Guide vane for the deflection of a fluid flow - Google Patents

Guide vane for the deflection of a fluid flow Download PDF

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Publication number
EP0133253B1
EP0133253B1 EP19840108570 EP84108570A EP0133253B1 EP 0133253 B1 EP0133253 B1 EP 0133253B1 EP 19840108570 EP19840108570 EP 19840108570 EP 84108570 A EP84108570 A EP 84108570A EP 0133253 B1 EP0133253 B1 EP 0133253B1
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EP
European Patent Office
Prior art keywords
shells
flow
shaft according
opening
venting
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
Application number
EP19840108570
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German (de)
French (fr)
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EP0133253A3 (en
EP0133253A2 (en
Inventor
Wilhelm Fritz Morschheuser
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.)
Rogal Gesellschaft fur Angewandte Lufttechnik Mbh
Original Assignee
ROBERTSON GAL GESELLSCHAFT fur ANGEWANDTE LUFTTECHNIK MBH
Rogal Gesellschaft fur Angewandte Lufttechnik Mbh
Priority date (The priority date 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 date listed.)
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Application filed by ROBERTSON GAL GESELLSCHAFT fur ANGEWANDTE LUFTTECHNIK MBH, Rogal Gesellschaft fur Angewandte Lufttechnik Mbh filed Critical ROBERTSON GAL GESELLSCHAFT fur ANGEWANDTE LUFTTECHNIK MBH
Publication of EP0133253A2 publication Critical patent/EP0133253A2/en
Publication of EP0133253A3 publication Critical patent/EP0133253A3/en
Application granted granted Critical
Publication of EP0133253B1 publication Critical patent/EP0133253B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates

Definitions

  • the invention relates to a ventilation shaft in which the rectilinear edge of an opening at the inlet is surrounded by a guide vane at a distance for the purpose of deflecting a fluid flow.
  • GB-A-826 222 it is known in a ventilation shaft to provide guide vanes in the form of mudguards which are arranged at the entrance to the ventilation shaft in such a way that splash water, in particular rain, is prevented from penetrating into the ventilation opening, so that even in the case precipitation does not have to close the ventilation opening.
  • the invention has for its object to provide a venting chac h t with a guide vane such that the otherwise considerable mounting effort for the guide vane can be significantly reduced. Above all, this is to prevent the fastening means from exerting a restrictive influence on the effective flow cross section. Furthermore, an effective damping of the considerable flow noises that often occur especially in the deflection area is to be achieved.
  • the new vent shaft reliably fixes the guide vanes within the opening in a particularly simple manner.
  • the assembly rod forms a closed structure which is completely fixed within the opening.
  • the double-shell design of the new guide vane is of considerable advantage in terms of flow technology, because flow disturbances of any kind can be avoided in principle by appropriate design of the guide vane cross-section limited by the shells.
  • the proposed geometric arrangement of the respective curved shells ensures that the flow lies behind the opening edge on the wall of the shaft.
  • connection of the shells to one another is particularly advantageous in terms of flow technology when the distance between the shells is substantially the same if it takes place in a rounded form at the flow inlet. This avoids any disturbance of the flow before the flow enters the opening.
  • the desired, closed construction is then achieved in that the two shells are penetrated by the assembly rod at their downstream end.
  • the space between the two shells can expediently be filled with sound-absorbing or sound-insulating material.
  • sound-absorbing or sound-insulating material both cell constructions and mineral fiber fillings are suitable.
  • the sound-absorbing effect is further enhanced by the fact that one of the two shells consists of a perforated sheet.
  • a further fluidic and static improvement of the guide vane occurs when one of the two shells consists of a trapezoidal profile sheet which is curved in the longitudinal direction of its profile in accordance with the curvature of the shells.
  • Such profiling gives the shell construction a particular strength and also enables the inflowing air to be guided very tightly.
  • the generally rectangular design of the inlet opening makes it possible to provide guide vanes with mutually opposite edges, between which the mounting rod extends.
  • the distance between the guide vanes is then advantageously 80% of the distance between the edges from one another, these guide vanes being arranged symmetrically with respect to the fluid line.
  • the new guide vane can be improved in terms of flow, fastening technology and statics in that the radius of curvature is approximately 40% of the distance between the edges of the opening, the arrangement then being able to be such that the shells are over 50% of their extent in the direction of flow lie outside the opening. In this way, although a torque is exerted around the connection of the shells to the mounting rod, the attachment of both shells to the mounting rod prevents any deviations from the intended position.
  • the fact that the shells have end sections which are parallel to the direction of flow also contributes to this and to the turbulence-free introduction of the flow, even if a duct connects to the opening, the walls of which are expediently at an angle of about 7 ° in each case diverge away from the direction of flow.
  • Figure 1 shows the lower part of a ventilation shaft, as it is used in a roof vent.
  • An opening 6 can be seen, which is delimited by the rounded edges 4.
  • the opening 6 is penetrated in the direction of the arrows 5 by the air flow to be discharged.
  • the two guide vanes 10, which are held by means of the mounting rod 8, are symmetrical to the flow center 7. The latter extends perpendicular to the flow between the diverging shaft walls 15 to which it is attached.
  • the guide vanes 10 are in turn rigidly connected via their two shells to the mounting rod 8 at their downstream end sections.
  • the ends of the guide vanes located at the flow inlet have connections of their shells in a rounded shape 9.
  • each of the guide vanes there is a center of curvature 16 outside the flow cross-section, around which they are bent with the radius of curvature 14.
  • the latter is approximately 40% of the distance that the edges 4 have from one another.
  • This edge distance is named 1.00 in FIG.
  • the other dimensions entered in FIG. 1 are related to this.
  • the shaft walls 15 diverge at an angle of 7 ° to the flow direction 5 and have a height of 0.3 of the edge spacing.
  • the shaft is followed by a more divergent section that rises at 38 ° from the horizontal.
  • the shells have sheets 1 perforated on both sides, between which sound-insulating material 2 is arranged.
  • the shells can also consist of smooth sheet metal 3 on both sides.
  • FIG. 2C shows a trapezoidal profiled sheet 13 on the outside of a guide vane, it being noted that this is a top view. In this case, the inner sheet is perforated.
  • FIG. 2D shows the arrangement of the trapezoidal profile sheet 11 on the inside, whereas the outer sheet 13 has a perforation.

Description

Die Erfindung bezieht sich auf einen Entlüftungsschaft, bei dem die geradlinige Kante einer am Eintritt bestehenden Öffnung zwecks Umlenkung einer Fluidströmung von einer Leitschaufel mit Abstand umrundet ist.The invention relates to a ventilation shaft in which the rectilinear edge of an opening at the inlet is surrounded by a guide vane at a distance for the purpose of deflecting a fluid flow.

Nach der GB-A-826 222 ist bei einem Entlüftungsschacht bekannt, Leitschaufeln in Form von Schutzblechen vorzusehen, die am Eintritt in den Entlüftungsschacht derart angeordnet sind, daß Spritzwasser, insbesondere Regen, gehindert wird, in die Entlüftungsöffnung einzudringen, damit man auch im Falle von Niederschlägen die Entlüftungsöffnung nicht verschließen muß.According to GB-A-826 222 it is known in a ventilation shaft to provide guide vanes in the form of mudguards which are arranged at the entrance to the ventilation shaft in such a way that splash water, in particular rain, is prevented from penetrating into the ventilation opening, so that even in the case precipitation does not have to close the ventilation opening.

Allgemein ist es bekannt, Leitschaufeln bei Kanalströmungen zu verwenden, die um eine Ecke herumgeführt werden müssen, bei welcher die Strömung sonst abreißen würde. Die Leitschaufeln ermöglichen es, in derartigen Fällen ein Anliegen der Strömung zu gewährleisten. Es ist jedoch konstruktiv immer sehr aufwendig, derartige Leitschaufeln im Strömungskanal an der jeweils vorgesehenen Stelle desselben zu befestigen, zumal die auf die Leitschaufeln einwirkenden Strömungskräfte häufig erheblich sind.It is generally known to use guide vanes in channel flows which have to be led around a corner at which the flow would otherwise break off. The guide vanes make it possible to ensure that the flow is present in such cases. However, it is always structurally very complex to fasten such guide vanes in the flow channel at the intended location of the same, especially since the flow forces acting on the guide vanes are often considerable.

Der Erfindung liegt die Aufgabe zugrunde, einen Entlüftungsschacht mit einer Leitschaufel derart auszubilden, daß der sonst erhebliche Befestigungsaufwand für die Leitschaufel erheblich herabgesetzt werden kann. Vor allem soll dadurch vermieden werden, daß von den Befestigungsmitteln ein einschränkender Einfluß auf den wirksamen Strömungsquerschnitt ausgeht. Weiterhin soll eine wirkungsvolle Dämpfung der gerade im Umlenkungsbereich oft auftretenden, erheblichen Strömungsgeräusche erzielt werden.The invention has for its object to provide a venting chac h t with a guide vane such that the otherwise considerable mounting effort for the guide vane can be significantly reduced. Above all, this is to prevent the fastening means from exerting a restrictive influence on the effective flow cross section. Furthermore, an effective damping of the considerable flow noises that often occur especially in the deflection area is to be achieved.

Diese Aufgabenstellung wird durch die Erfindung, wie sie in den Patentansprüchen gekennzeichnet ist, gelöst.This problem is solved by the invention as characterized in the claims.

Demnach kommt man bei dem neuen Entlüftungsschacht zu einer zuverlässigen Fixierung der Leitschaufeln innerhalb der Öffnung in einer besonders einfachen Weise. Die Montagestange bildet infolge ihrer Befestigung an beiden Schalen mit letzteren, die untereinander gleichfalls in fester Verbindung miteinander stehen, eine geschlossene Konstruktion aus, die innerhalb der Öffnung vollständig festliegt. Daneben ist die doppelschalige Ausbildung der neuen Leitschaufel strömungstechnisch von beträchtlichem Vorteil, weil sich grundsätzlich Strömungsstörungen jeglicher Art durch entsprechende Gestaltung des durch die Schalen begrenzten Leitschaufelquerschnittes vermeiden lassen. Vor allem wird durch die vorgeschlagene geometrische Anordnung der jeweils gerkrümmten Schalen sichergestellt, daß die Strömung hinter der Öffnungskante an der Wand des Schachtes anliegt.Accordingly, the new vent shaft reliably fixes the guide vanes within the opening in a particularly simple manner. As a result of its attachment to the two shells with the latter, which are also firmly connected to one another, the assembly rod forms a closed structure which is completely fixed within the opening. In addition, the double-shell design of the new guide vane is of considerable advantage in terms of flow technology, because flow disturbances of any kind can be avoided in principle by appropriate design of the guide vane cross-section limited by the shells. Above all, the proposed geometric arrangement of the respective curved shells ensures that the flow lies behind the opening edge on the wall of the shaft.

Die Verbindung der Schalen untereinander ist bei einem im wesentlichen gleichbleibenden Abstand der Schalen voneinander strömungstechnisch dann besonders vorteilhaft, wenn sie am Strömungseintritt in gerundeter Form erfolgt. Dadurch wird bereits vor Eintritt der Strömung in die Öffnung eine Strömungsbeunruhigung vermieden. Die gewünschte, geschlossene Konstruktion wird dann dadurch erreicht, daß die beiden Schalen an ihrem strömungsabwärts liegenden Ende von der Montagestange durchsetzt sind.The connection of the shells to one another is particularly advantageous in terms of flow technology when the distance between the shells is substantially the same if it takes place in a rounded form at the flow inlet. This avoids any disturbance of the flow before the flow enters the opening. The desired, closed construction is then achieved in that the two shells are penetrated by the assembly rod at their downstream end.

Der Raum zwischen den beiden Schalen läßt sich zweckmäßig mit schallabsorbierendem bzw. schallisolierendem Material ausfüllen. Als solches sind sowohl Zellenkonstruktionen als auch Mineralfaser-Füllungen geeignet.The space between the two shells can expediently be filled with sound-absorbing or sound-insulating material. As such, both cell constructions and mineral fiber fillings are suitable.

Die schallabsorbierende Wirkung wird noch dadurch begünstigt, daß eine der beiden Schalen aus einem gelochten Blech besteht.The sound-absorbing effect is further enhanced by the fact that one of the two shells consists of a perforated sheet.

Eine weitere strömungstechnische sowie statische Verbesserung der Leitschaufel tritt ein, wenn eine der beiden Schalen aus einem Trapezprofilblech besteht, welches in Längsrichtung seiner Profilierung entsprechend der Krümmung der Schalen gekrümmt ist. Eine derartige Profilierung gibt der Schalenkonstruktion eine besondere Festigkeit und ermöglicht darüber hinaus eine sehr straffe Führung der einströmenden Luft.A further fluidic and static improvement of the guide vane occurs when one of the two shells consists of a trapezoidal profile sheet which is curved in the longitudinal direction of its profile in accordance with the curvature of the shells. Such profiling gives the shell construction a particular strength and also enables the inflowing air to be guided very tightly.

Die in der Regel rechteckige Ausführung der Eintrittsöffnung ermöglicht es, Leitschaufeln bei sich parallel gegenüberliegenden Kanten vorzusehen, zwischen welchen sich die Montagestange erstreckt. Der Abstand der Leitschaufeln beträgt dann vorteilhaft 80 % des Abstandes der Kanten voneinander, wobei diese Leitschaufeln symmetrisch zur Strömungsmittellinie hin angeordnet sind.The generally rectangular design of the inlet opening makes it possible to provide guide vanes with mutually opposite edges, between which the mounting rod extends. The distance between the guide vanes is then advantageously 80% of the distance between the edges from one another, these guide vanes being arranged symmetrically with respect to the fluid line.

Weiterhin läßt sich die neue Leitschaufel strömungstechnisch sowie befestigungstechnisch bzw. statisch noch dadurch verbessern, daß der Krümmungshalbmesser etwa 40 % des Abstandes der Kanten der Öffnung beträgt, wobei die Anordnung dann so getroffen werden kann, daß die Schalen zu über 50 % ihrer Erstreckung in Strömungsrichtung außerhalb der Öffnung liegen. Auf diese Weise wird zwar ein Drehmoment um die Verbindung der Schalen mit der Montagestange herum ausgeübt, jedoch verhindert die Befestigung beider Schalen an der Montagestange jegliche Abweichungen von der vorgesehenen Lage. Hierzu sowie zur turbulenzfreien Einleitung der Strömung in die Eintrittsöffnung trägt bei, daß die Schalen Endabschnitte aufweisen, die parallel zur Strömungsrichtung weisen, und zwar auch dann, wenn sich an die Öffnung ein Schacht anschließt, dessen Wände zweckmäßig mit einem Winkel von jeweils etwa 7° von der Strömungsrichtung weg divergieren.Furthermore, the new guide vane can be improved in terms of flow, fastening technology and statics in that the radius of curvature is approximately 40% of the distance between the edges of the opening, the arrangement then being able to be such that the shells are over 50% of their extent in the direction of flow lie outside the opening. In this way, although a torque is exerted around the connection of the shells to the mounting rod, the attachment of both shells to the mounting rod prevents any deviations from the intended position. The fact that the shells have end sections which are parallel to the direction of flow also contributes to this and to the turbulence-free introduction of the flow, even if a duct connects to the opening, the walls of which are expediently at an angle of about 7 ° in each case diverge away from the direction of flow.

Zur weiteren Veranschaulichung der Erfindung wird auf die sich auf Ausführungsbeispiele beziehenden Zeichnungen Bezug genommen. Darin zeigen:

  • Figur 1 einen Querschnitt durch den unteren Teil eines Entlüftungsschachtes mit den erfindungsgemäßen Leitschaufeln und
  • Figur 2 A bis D unterschiedliche Schalen der Leitschaufeln.
To further illustrate the invention, reference is made to the drawings relating to exemplary embodiments. In it show:
  • 1 shows a cross section through the lower part of a ventilation shaft with the guide vanes according to the invention and
  • 2A to D different shells of the guide vanes.

Figur 1 zeigt den unteren Teil eines Entlüftungsschachtes, wie er bei einem Dachentlüfter Verwendung findet. Man erkennt eine Öffnung 6, die von den abgerundet ausgebildeten Kanten 4 begrenzt ist. Die Öffnung 6 ist in Richtung der Pfeile 5 von der abzuführenden Luftströmung durchsetzt Symmetrisch zur Strömungsmitte 7 liegen die beiden Leitschaufeln 10, die mittels der Montagestange 8 gehalten sind. Letztere erstreckt sich senkrecht zur Strömung zwischen den divergierend ausgebildeten Schachtwänden 15, an denen sie befestigt ist. Die Leitschaufeln 10 sind ihrerseits über ihre beiden Schalen mit der Montagestange 8 an ihren strömungsabwärts gelegenen Endabschnitten starr verbunden. Die am Strömungseintritt gelegenen Enden der Leitschaufeln weisen Verbindungen ihrer Schalen in gerundeter Form 9 auf. Für jede der Leitschaufeln besteht ein Krümmungsmittelpunkt 16 außerhalb des Strömungsquerschnittes, um welchem sie mit dem Krümmungshalbmesser 14 gebogen sind. Letztere beträgt etwa 40 % des Abstandes, den die Kanten 4 voneinander haben. Dieser Kantenabstand ist in Figur 1 mit 1,00 benannt. Hierauf sind die übrigen in Figur 1 eingetragenen Maße bezogen. So besteht zwischen den beiden Leitschaufeln 10 ein Abstand von 0,8, wobei sie in Strömungsrichtung eine Strecke von 0,28 aufweisen, von der 0,11 innerhalb der Öffnung 6 und 0,17 außerhalb der Öffnung liegen. Die Schachtwände 15 divergieren mit einem Winkel von 7° zur Strömungsrichtung 5 und haben eine Höhe von 0,3 des Kantentabstandes. An den Schacht schließt sich ein stärker divergierender Abschnitt an, der mit 38° gegenüber der Horizontalen ansteigt.Figure 1 shows the lower part of a ventilation shaft, as it is used in a roof vent. An opening 6 can be seen, which is delimited by the rounded edges 4. The opening 6 is penetrated in the direction of the arrows 5 by the air flow to be discharged. The two guide vanes 10, which are held by means of the mounting rod 8, are symmetrical to the flow center 7. The latter extends perpendicular to the flow between the diverging shaft walls 15 to which it is attached. The guide vanes 10 are in turn rigidly connected via their two shells to the mounting rod 8 at their downstream end sections. The ends of the guide vanes located at the flow inlet have connections of their shells in a rounded shape 9. For each of the guide vanes there is a center of curvature 16 outside the flow cross-section, around which they are bent with the radius of curvature 14. The latter is approximately 40% of the distance that the edges 4 have from one another. This edge distance is named 1.00 in FIG. The other dimensions entered in FIG. 1 are related to this. There is a distance of 0.8 between the two guide vanes 10, whereby they have a distance of 0.28 in the flow direction, of which 0.11 lies within the opening 6 and 0.17 lies outside the opening. The shaft walls 15 diverge at an angle of 7 ° to the flow direction 5 and have a height of 0.3 of the edge spacing. The shaft is followed by a more divergent section that rises at 38 ° from the horizontal.

Die Schalen haben nach Figur 2A beidseitig perforierte Bleche 1, zwischen denen schallisolierendes Material 2 angeordnet ist. Nach Figur 2B können die Schalen auch beidseitig aus glatten Blech 3 bestehen. Figur 2C zeigt auf der Außenseite einer Leitschaufel ein Trapezprofilblech 13, wobei zu beachten ist, daß es sich um eine Draufsicht handelt. Das Innenblech ist in diesem Fall perforiert. Figur 2D zeigt demgegenüber die Anordnung des Trapezprofilbleches 11 auf der Innenseite, wohingegen das Außenblech 13 eine Perforation aufweist.According to FIG. 2A, the shells have sheets 1 perforated on both sides, between which sound-insulating material 2 is arranged. According to FIG. 2B, the shells can also consist of smooth sheet metal 3 on both sides. FIG. 2C shows a trapezoidal profiled sheet 13 on the outside of a guide vane, it being noted that this is a top view. In this case, the inner sheet is perforated. In contrast, FIG. 2D shows the arrangement of the trapezoidal profile sheet 11 on the inside, whereas the outer sheet 13 has a perforation.

Claims (8)

1. Venting shaft, in which the straight-lined edge (4) of an opening (6) provided at the inlet is lapped with a spacing by a guide vane (10) for the deflection of a fluid flow, characterized in that the guide vane (10) features two shells (1, 3, 11, 13) rigidly connected to one another, which converge downstream in the direction of flow (5) and diverge upstream outside the opening (6) away from the centre of flow (7), both shells being interspersed by a mounting rod (8) attached in cross section to each of said shells, which extends approximately perpendicularly from the edge of the opening to the direction of flow (5).
2. Venting shaft according to claim 1, characterized in that the shells are arranged at an approximately constant spacing and feature a connection to one another in round form (9) at the flow inlet, whereas they are interspersed by the mounting rod (8) at the downstream end.
3. Venting shaft according to claims 1 and 2, characterized in that the gap between the shells (1, 3, 11, 13) is filled wi th a soundproofing material (2).
4. Venting shaft according to claims 1 to 3, characterized in that at least one of the two shells (1,13) is made of a perforated plate.
5. Venting shaft according to claim 4, characterized in that one of the two shells (13) is a plate with trapezoidal corrugations, which is bent in the longitudinal direction of its shaping.
6. Venting shaft according to claims 1 to 5, characterized in that the guide vanes (10) are arranged at parallel opposite edges (4) at 80 % of the spacing of the edges as well as simmetrically, the mounting rods (8) extending between the edges.
7. Venting shaft according to claim 6, characterized in that the shells feature a bending radius (14) of approximately 40 % of the edge spacing and lie to more than 50 % outside the opening.
8. Venting shaft according to claims 1 to 4, characterized in that the guide vanes (10) have, at shaft walls diverging by less than 7 % each from the direction of flow, end sections pointing in the direction of flow and orientated downstream.
EP19840108570 1983-07-23 1984-07-20 Guide vane for the deflection of a fluid flow Expired EP0133253B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3326592 1983-07-23
DE19833326592 DE3326592A1 (en) 1983-07-23 1983-07-23 GUIDE BLADE FOR DEFLECTING A FLUID FLOW

Publications (3)

Publication Number Publication Date
EP0133253A2 EP0133253A2 (en) 1985-02-20
EP0133253A3 EP0133253A3 (en) 1986-09-17
EP0133253B1 true EP0133253B1 (en) 1988-05-18

Family

ID=6204738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840108570 Expired EP0133253B1 (en) 1983-07-23 1984-07-20 Guide vane for the deflection of a fluid flow

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EP (1) EP0133253B1 (en)
DE (1) DE3326592A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402343B (en) * 1993-04-28 1997-04-25 Krantz H Gmbh & Co Outlet for a laminar airflow
DE29621845U1 (en) * 1996-12-03 1997-06-12 Sick Wolfgang Air supply or exhaust device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE867605C (en) * 1942-07-31 1953-02-19 Siemens Ag Air conveying device, especially for electrostatic precipitators for cleaning room air u. like
GB826222A (en) * 1955-07-06 1959-12-31 Colt Ventilation Ltd Improvements in ventilators
DE1650079A1 (en) * 1967-07-14 1970-08-27 Licentia Gmbh Device for improving the efficiency of greatly expanded diffusers
DE6751686U (en) * 1968-07-24 1969-03-06 Gal Ges Fuer Angewandte Luftte BLIND ELEMENT FOR MULTIPLE ARRANGEMENT
FR2262769A1 (en) * 1974-03-01 1975-09-26 Strulik Wilhelm Insulating air conditioning duct - formed from incombustible sheet grooved to permit bending, has external seal and internal protection
GB1502355A (en) * 1974-09-18 1978-03-01 Licencia Talalmanyokat Soundattenuating devices for silencing gaseous flow in ducting
DD159446A1 (en) * 1981-06-09 1983-03-09 Herbert Bernhard DEVICE FOR CONTINUOUS PROCESSING OF INSTALLATIONS IN THROUGH STROKES
DE3149077A1 (en) * 1981-12-11 1983-06-16 Ruhrkohle Ag, 4300 Essen Silencer for mine ventilators
DE8202119U1 (en) * 1982-01-26 1982-10-28 Schlick, Werner, 1000 Berlin FLOW GUIDE

Also Published As

Publication number Publication date
DE3326592A1 (en) 1985-01-31
DE3326592C2 (en) 1991-10-31
EP0133253A3 (en) 1986-09-17
EP0133253A2 (en) 1985-02-20

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