EP0051005B1 - Axial-flow ventilator with protected rotor blades - Google Patents

Axial-flow ventilator with protected rotor blades Download PDF

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Publication number
EP0051005B1
EP0051005B1 EP81401532A EP81401532A EP0051005B1 EP 0051005 B1 EP0051005 B1 EP 0051005B1 EP 81401532 A EP81401532 A EP 81401532A EP 81401532 A EP81401532 A EP 81401532A EP 0051005 B1 EP0051005 B1 EP 0051005B1
Authority
EP
European Patent Office
Prior art keywords
grating
hub
edge
protective
fan
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
EP81401532A
Other languages
German (de)
French (fr)
Other versions
EP0051005A1 (en
Inventor
Joel Crespin
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.)
Lunite Hermetique SA
Original Assignee
Lunite Hermetique SA
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.)
Filing date
Publication date
Application filed by Lunite Hermetique SA filed Critical Lunite Hermetique SA
Publication of EP0051005A1 publication Critical patent/EP0051005A1/en
Application granted granted Critical
Publication of EP0051005B1 publication Critical patent/EP0051005B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/219—Guards
    • Y10T74/2191—Guards for rotary member

Definitions

  • the present invention relates to an axial fan provided with a facial and radial protection device.
  • the English document GB-A-833 938 describes a fan according to the preamble of claim 1, comprising a protection device integral with the hub.
  • This protection device consists of a facial protection grid made up of radial elements making it possible to prevent access of certain foreign bodies between the blades of the fan.
  • the present invention relates to the realization of a space-saving axial fan, of low cost price, having satisfactory aerodynamic characteristics and comprising a facial and radial protection device which prevents the introduction of foreign bodies between the blades of the fan.
  • an axial fan comprising a hub carrying at least two blades and provided with a central hole for the passage of the motor shaft, and a protection device integral with the hub comprising a face protection grid and a radial protection ring integral with the grid, this ring being coaxial with the motor shaft and surrounding the radial ends of the blades, the facial protection grid consisting of bars arranged in a sufficiently tight manner to effectively reduce the intervals between these bars and prevent the introduction of foreign bodies between the blades, is characterized in that the bars of the grid are exclusively concentric rings, coaxial with the motor shaft, and in that the protective ring is a ferrule formed by a cylindrical wall and smooth, and in that the face protection grid and the ferrule are obtained in one piece by molding a plastic material.
  • the invention relates to the production by molding in a single block, the axial and radial protection device, the hub and the blades of the fan.
  • the fan according to the invention comprises a hub 15 carrying blades 12, 13 and a protection device comprising a face protection grid 11 formed of several concentric rings 20 connected to each other by arms 21.
  • This grid 11 is provided, at its periphery, with a radial protection ferrule 10 formed by a cylindrical wall, coaxial with the rings 20.
  • the arms 21 can be obtained by extensions of this ferrule 10.
  • the facial grid 10 is provided with a central orifice, the flange 22 of which is curved so as to be substantially parallel to the ferrule 10.
  • This flange 22, intended for fixing the protection device on the hub 15 of the fan can be introduced into a hollow part 18 of the free end of the hub 15 which has a central hole 16 for the passage of a motor shaft (not shown) of the fan, holes 17 allowing the fixing the hub 15 on the shaft.
  • the immobilization of the protection device on the hub 15 can then be effected by means of glue, rivets, screws or any other suitable means of assembly. After assembly on the hub 15, the protection device can rotate at the same speed as this hub 15.
  • the cylindrical wall of the ferrule 10 is arranged coaxially around the blades 12 and 13 of the fan, its axis coinciding with the axis of rotation of the motor shaft.
  • the inner parts of the blades 12, 13 are attached to a cylindrical wall 14 integral with the means 15 and coaxial with this hub 15 which has the shape of a disc.
  • the blades 12, 13 and the hub 15 were obtained in one piece, by molding a plastic material, or other moldable material, allowing to benefit from a very reduced cost price.
  • the grid 11 and the protective shell 10 can also be obtained, in one piece, by molding a plastic or other material.
  • the outer surface of the cylindrical wall of the shell 10 must be smooth. In fact, when the fan is operating, external objects or elements which may come into contact with this shell 10 will be pushed back or deflected and cannot in any way come into contact with the blades 12, 13.
  • the concentric rings 20 of the grid are arranged in a sufficiently tight manner to effectively reduce the intervals 23 between the rings 20. These rings 20 are partially in contact with the upstream edges 24 of the blades 12, 13 so as to reinforce the structure of the grid 11 as shown in FIGS. 1 and 2.
  • the fan according to the invention can comprise any number of blades, six for example, as shown in FIG. 1.
  • the protection device 30 comprising a face grid 31 and a ferrule 10, is molded in one piece with the hub 15 and the blades 32, 33.
  • the grid 31 is formed of concentric rings 34 partially in contact with the upstream edge 35 of the blades 32, 33. In this way, the positioning arms of the concentric rings 34 are eliminated, because they have become unnecessary.
  • This embodiment using a one-piece molding, is particularly advantageous and makes it possible to obtain axial fans with facial and radial protection, which can be mounted without drawback in many industrial, semi-industrial or household appliances.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

La présente invention concerne un ventilateur axial muni d'un dispositif de protection faciale et radiale.The present invention relates to an axial fan provided with a facial and radial protection device.

Elle a pour but d'éviter un contact accidentel dangereux d'éléments extérieurs avec les pales du ventilateur.Its purpose is to avoid dangerous accidental contact of external elements with the fan blades.

On connaît des ventilateurs à hélice pour lesquels la nécessité de rendre non dangereux les contacts accidentels d'éléments extérieurs avec les pales a conduit à adopter des pales en matière souple. En général, il est difficle de concilier de bonnes caractéristiques aérodynamiques avec une souplesse de matière suffisante pour rendre les chocs non dangereux.Propeller fans are known for which the need to make accidental contact of external elements with the blades non-hazardous has led to the adoption of blades made of flexible material. In general, it is difficult to reconcile good aerodynamic characteristics with sufficient material flexibility to make impacts non-hazardous.

Une autre solution couramment adoptée consiste à utiliser des pales rigides tournant à l'intérieur d'une cage de protection fixe grillagée ou à barreux et dont les mailles laissent passer l'air propulsé. Une tell cage de protection est coûteuse et augmente sensiblement le volume et le poids de l'ensemble du ventilateur.Another commonly adopted solution consists in using rigid blades rotating inside a fixed protective cage with wire mesh or with a barrier and the meshes of which allow the propelled air to pass. A tell cage is expensive and significantly increases the volume and weight of the fan assembly.

Le document anglais GB-A-833 938 décrit un ventilateur selon le préambule de la revendication 1, comportant un dispositif de protection solidaire du moyeu. Ce dispositif de protection est constitué d'une grille de protection faciale composée d'éléments radiaux permettant d'empêcher l'accès de certains corps étrangers entre les pales du ventilateur. Un anneau extérieur, fixé sur les pales du ventilateur, maintient les éléments radiaux à la périphérie du ventilateur et participe à la protection.The English document GB-A-833 938 describes a fan according to the preamble of claim 1, comprising a protection device integral with the hub. This protection device consists of a facial protection grid made up of radial elements making it possible to prevent access of certain foreign bodies between the blades of the fan. An outer ring, fixed on the fan blades, holds the radial elements on the periphery of the fan and contributes to protection.

La présente invention a pour objet la réalisation d'un ventilateur axial peu encombrant, de faible prix de revient, ayant des caractéristiques aérodynamiques satisfaisantes et comportant un dispositif de protection faciale et radiale qui empêche l'introduction de corps étrangers entre les pales du ventilateur.The present invention relates to the realization of a space-saving axial fan, of low cost price, having satisfactory aerodynamic characteristics and comprising a facial and radial protection device which prevents the introduction of foreign bodies between the blades of the fan.

Suivant l'invention, un ventilateur axial comportant un moyeu porteur d'au moins deux pales et muni d'un trou central pour le passage de l'arbre moteur, et un dispositif de protection solidaire du moyeu comprenant une grille de protection faciale et une bague de protection radiale solidaire de la grille, cette bague étant coaxiale à l'arbre moteur et entourant les extrémités radiales des pales, la grille de protection faciale étant constituée de barreaux disposés de façon assez serrée pour réduire efficacement les intervalles entre ces barreaux et empêcher l'introduction de corps étrangers entre les pales, est caractérisé en ce que les barreaux de la grille sont exclusivement des anneaux concentriques, coaxiaux à l'arbre moteur, et en ce que la bague de protection est une virole formée d'une paroi cylindrique et lisse, et en ce que la grille de protection faciale et la virole sont obtenues d'une seule pièce par moulage d'une matière plastique.According to the invention, an axial fan comprising a hub carrying at least two blades and provided with a central hole for the passage of the motor shaft, and a protection device integral with the hub comprising a face protection grid and a radial protection ring integral with the grid, this ring being coaxial with the motor shaft and surrounding the radial ends of the blades, the facial protection grid consisting of bars arranged in a sufficiently tight manner to effectively reduce the intervals between these bars and prevent the introduction of foreign bodies between the blades, is characterized in that the bars of the grid are exclusively concentric rings, coaxial with the motor shaft, and in that the protective ring is a ferrule formed by a cylindrical wall and smooth, and in that the face protection grid and the ferrule are obtained in one piece by molding a plastic material.

Des modes de réalisation additionnels font l'objet des sous-revendications. Particulièrement l'invention a pour objet la réalisation par moulage en un seul bloc, du dispositif de protection axiale et radiale, du moyeu et des pales du ventilateur.Additional embodiments are the subject of the subclaims. Particularly the invention relates to the production by molding in a single block, the axial and radial protection device, the hub and the blades of the fan.

L'invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description ci-après et des dessins qui l'accompagnent et sur lesquels:

  • - la figure 1 représente une vue en élévation d'un mode de réalisation du dispositif de protection pour ventilateur axial conforme à l'invention.
  • -la figure 2 représente une vue en coupe diamétrale AA du dispositif précédent.
  • -la figure 3 représente une vue en élévation d'un mode de réalisation d'un ensemble monobloc comprenant un ventilateur axial et son dispositif de protection conformes à l'invention.
  • -la figure 4 représente une vue en coupe diamétrale BB de l'ensemble montré par la figure 3.
  • - la figure 5 représente une vue en coupe radiale SS de l'ensemble montré par les figures 3 et 4.
The invention will be better understood and other characteristics will appear from the following description and the accompanying drawings, in which:
  • - Figure 1 shows an elevational view of an embodiment of the protection device for axial fan according to the invention.
  • FIG. 2 represents a view in diametral section AA of the preceding device.
  • FIG. 3 represents an elevation view of an embodiment of a monobloc assembly comprising an axial fan and its protection device according to the invention.
  • FIG. 4 represents a view in diametrical section BB of the assembly shown in FIG. 3.
  • FIG. 5 represents a view in radial section SS of the assembly shown in FIGS. 3 and 4.

Dans l'ensemble de réalisation montré en figures 1 et 2, le ventilateur suivant l'invention comprend un moyeu 15 porteur de pales 12, 13 et un dispositif de protection comportant une grille 11 de protection faciale formée de plusieurs anneaux 20 concentriques reliés entre eux par des bras 21. Cette grille 11 est munie, à sa périphérie, d'une virole 10 de protection radiale formée d'une paroi cylindrique, coaxiale aux anneaux 20. Les bras 21 peuvent être obtenus par des prolongements de cette virole 10.In the assembly shown in FIGS. 1 and 2, the fan according to the invention comprises a hub 15 carrying blades 12, 13 and a protection device comprising a face protection grid 11 formed of several concentric rings 20 connected to each other by arms 21. This grid 11 is provided, at its periphery, with a radial protection ferrule 10 formed by a cylindrical wall, coaxial with the rings 20. The arms 21 can be obtained by extensions of this ferrule 10.

Dans l'exemple représenté en figure 2, la grille 10 faciale est munie d'un orifice central dont le rebord 22 est recourbé de façon à être sensiblement parallèle à la virole 10. Ce rebord 22, destiné à la fixation du dispositif de protection sur le moyeu 15 du ventilateur peut venir s'introduire dans une partie creuse 18 de l'extrémité libre du moyeu 15 qui comporte un trou 16 central pour le passage d'un arbre de moteur (non représenté) du ventilateur, des trous 17 permettant la fixation du moyeu 15 sur l'arbre. L'immobilisation du dispositif de protection sur le moyeu 15 peut alors s'effecteur au moyen de colle, de rivets, de vis ou tout autre moyen d'assemblage convenable. Après assemblage sur le moyeu 15, le dispositif de protection peut tourner à la même vitesse que ce moyeu 15. La paroi cylindrique de la virole 10 est disposés coaxialement autour des pales 12 et 13 du ventilateur, son axe coïncidant avec l'axe de rotation de l'arbre moteur.In the example shown in FIG. 2, the facial grid 10 is provided with a central orifice, the flange 22 of which is curved so as to be substantially parallel to the ferrule 10. This flange 22, intended for fixing the protection device on the hub 15 of the fan can be introduced into a hollow part 18 of the free end of the hub 15 which has a central hole 16 for the passage of a motor shaft (not shown) of the fan, holes 17 allowing the fixing the hub 15 on the shaft. The immobilization of the protection device on the hub 15 can then be effected by means of glue, rivets, screws or any other suitable means of assembly. After assembly on the hub 15, the protection device can rotate at the same speed as this hub 15. The cylindrical wall of the ferrule 10 is arranged coaxially around the blades 12 and 13 of the fan, its axis coinciding with the axis of rotation of the motor shaft.

Dans l'exemple représenté en figure 2, les parties intérieures des pales 12, 13 sont attachées à une paroi cylindrique 14 solidaire du moyen 15 et coaxiale à ce moyeu 15 qui a la forme d'un disque.In the example shown in Figure 2, the inner parts of the blades 12, 13 are attached to a cylindrical wall 14 integral with the means 15 and coaxial with this hub 15 which has the shape of a disc.

En fait, les pales 12, 13 et le moyeu 15 ont été obtenus d'une seule pièce, par moulage d'une matière plastique, ou autre matériau moulable, permettant de bénéficier d'un prix de revient très réduit.In fact, the blades 12, 13 and the hub 15 were obtained in one piece, by molding a plastic material, or other moldable material, allowing to benefit from a very reduced cost price.

Pour la même raison, la grille 11 et la virole 10 de protection peuvent être également obtenues, d'une seule pièce, par moulage d'une matière plastique ou autre.For the same reason, the grid 11 and the protective shell 10 can also be obtained, in one piece, by molding a plastic or other material.

La surface extérieure de la paroi cylindrique de la virole 10 doit être lisse. En effet, lorsque le ventilateur fonctionne, les objets ou éléments extérieurs pouvant venir en contact avec cette virole 10 seront repoussés ou déviés et ne pourront er aucune façon entrer en contact avec les pales 12, 13.The outer surface of the cylindrical wall of the shell 10 must be smooth. In fact, when the fan is operating, external objects or elements which may come into contact with this shell 10 will be pushed back or deflected and cannot in any way come into contact with the blades 12, 13.

Par ailleurs, les anneux 20 concentriques de la grille sont disposés de façon assez serrée pour réduire efficacement les intervalles 23 entre les anneaux 20. Ces anneaux 20 sont partiellement en contact avec les bords amont 24 des pales 12, 13 de façon à renforcer la structure de la grille 11 comme montré en figures 1 et 2.Furthermore, the concentric rings 20 of the grid are arranged in a sufficiently tight manner to effectively reduce the intervals 23 between the rings 20. These rings 20 are partially in contact with the upstream edges 24 of the blades 12, 13 so as to reinforce the structure of the grid 11 as shown in FIGS. 1 and 2.

Il est entendu que le ventilateur suivant l'invention peut comporter un nombre quelconque de pales, six par exemple, comme montré en figure 1.It is understood that the fan according to the invention can comprise any number of blades, six for example, as shown in FIG. 1.

Dans un autre exemple de réalisation montré en figures 3, 4 et 5, le dispositif de protection 30 suivant l'invention, comprenant une grille 31 faciale et une virole 10, est moulé en une seule piece avec le moyeu 15 et les pales 32, 33. La grille 31 est formée d'anneaux 34 concentriques partiellement en contact avec le bord amont 35 des pales 32, 33. De cette façon, les bras de positionnement des anneaux 34 concentriques sont supprimés, car devenus inutiles.In another exemplary embodiment shown in FIGS. 3, 4 and 5, the protection device 30 according to the invention, comprising a face grid 31 and a ferrule 10, is molded in one piece with the hub 15 and the blades 32, 33. The grid 31 is formed of concentric rings 34 partially in contact with the upstream edge 35 of the blades 32, 33. In this way, the positioning arms of the concentric rings 34 are eliminated, because they have become unnecessary.

Ce mode de réalisation, utilisant un moulage monobloc, est particulièrement avantageux et permet d'obtenir des ventilateurs axiaux à protection faciale et radiale, qui peuvent être montés sans inconvénient dans beaucoup d'appareils industriels, semi-industriels ou électro-ménagers.This embodiment, using a one-piece molding, is particularly advantageous and makes it possible to obtain axial fans with facial and radial protection, which can be mounted without drawback in many industrial, semi-industrial or household appliances.

A titre indicatif, de tels ventilateurs peuvent équiper des groupes frigorifiques dont ils augmentent sensiblement le rendement.As an indication, such fans can equip refrigeration units whose performance they significantly increase.

Claims (6)

1. Axial fan comprising a hub (15) carrying at least two vanes (12, 13; 32, 33) and provided with a central hole (16) for the passage of the motor shaft, and a protective device which is connected fixedly to the hub and comprises a facial protective grating (11, 31) and a radial protective ring (10) fixedly connected to the grating, said ring being coaxial with the motor shaft and surrounding the radial ends of the vanes (12, 13; 32, 33), the facial protective grid (11, 31) being formed from rods (20, 32) arranged relatively closely together to effectively reduce the intermediate spaces (23) between said rods (20, 34) and prevent the penetation of foreign bodies between the vanes, characterized in that the rods of the grating are all concentric rings (20, 34) coaxial with the motor shaft, that the protective ring is a hoop (10) formed from a cylindrical and smooth wall, and that the facial protective grating and the hoop (10) are molded in one piece from plastic material.
2. Fan according to claim 1, characterized in that the grating (11) is provided with a central orifice having an inwardly bent edge (22) parallel to the cylindrical wall of the hoop (10), said edge (22) being intended for the securing of the protective means to the hub (15).
3. Fan according to claim 2, characterized in that the concentric rings (20, 34) of the grating (11) are connected together and to the edge (22) by struts (21).
4. Fan according to claim 2, characterized in that the free end of the fan (15) includes a hollow portion (18), into which the bent-over edge (22) can be introduced and that assembly means permit the securing of said edge (22) to the hollow wall (18) of the hub (15).
5. Fan according to claim 1, characterized in that the grating (31), the hoop (10), the vanes (32, 33) and the hub (15) are made in one piece.
6. Fan according to claim 5, characterized in that the concentric rings (34) of the grating (31) are secured to the upstream edge (35) of the vanes (32, 33).
EP81401532A 1980-10-17 1981-10-02 Axial-flow ventilator with protected rotor blades Expired EP0051005B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8022273A FR2492477A1 (en) 1980-10-17 1980-10-17 PROTECTIVE DEVICE FOR AXIAL FAN AND AXIAL FAN HAVING SUCH A DEVICE
FR8022273 1980-10-17

Publications (2)

Publication Number Publication Date
EP0051005A1 EP0051005A1 (en) 1982-05-05
EP0051005B1 true EP0051005B1 (en) 1985-06-19

Family

ID=9247036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401532A Expired EP0051005B1 (en) 1980-10-17 1981-10-02 Axial-flow ventilator with protected rotor blades

Country Status (7)

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US (1) US4456431A (en)
EP (1) EP0051005B1 (en)
JP (1) JPS5797099A (en)
DE (1) DE3171043D1 (en)
ES (1) ES269207Y (en)
FR (1) FR2492477A1 (en)
PT (1) PT73829B (en)

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Publication number Priority date Publication date Assignee Title
US4664598A (en) * 1984-10-05 1987-05-12 Reliance Electric Company Unitized quick-assembly fan
US5203826A (en) * 1990-02-16 1993-04-20 Proform Fitness Products, Inc. Enclosed flywheel
JP3063129B2 (en) * 1990-09-03 2000-07-12 株式会社デンソー Automotive cooling fan device
US6099258A (en) * 1998-10-09 2000-08-08 Lasko Holdings, Inc. High velocity fan
DE20208250U1 (en) * 2002-05-27 2003-10-02 Guentner Gmbh Hans Protection against accidental contact for fans, in particular for air coolers
US20160288175A1 (en) * 2013-11-20 2016-10-06 Nilfisk A/S Cleaning device
US10876545B2 (en) * 2018-04-09 2020-12-29 Vornado Air, Llc System and apparatus for providing a directed air flow

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Publication number Priority date Publication date Assignee Title
US1072189A (en) * 1911-10-17 1913-09-02 Sparks Withington Co Rotary fan.
CH165931A (en) * 1933-03-01 1933-12-15 Bbc Brown Boveri & Cie Protective grille for fans.
US2091677A (en) * 1936-01-31 1937-08-31 William J Fredericks Impeller
US2361676A (en) * 1939-05-15 1944-10-31 Lin E Baker Device for impelling and propelling fluid or gas or the like
US2791373A (en) * 1956-03-16 1957-05-07 John D Wilcox Safety guard for electric fans
GB833938A (en) * 1957-04-01 1960-05-04 Caterpillar Tractor Co Self-cleaning fan guard
FR1347780A (en) * 1962-11-19 1964-01-04 Philips Brasil Improvements to protection systems for fans or the like
DE1628375B2 (en) * 1966-06-11 1976-10-07 Siemens AG, 1000 Berlin und 8000 München SHEET STEEL FAN WHEEL
DE2345539A1 (en) * 1973-09-10 1975-03-20 Siemens Ag Wire inlet guard for wall mounted fan - has radial supports at angle to direction of flow

Also Published As

Publication number Publication date
FR2492477A1 (en) 1982-04-23
JPS5797099A (en) 1982-06-16
DE3171043D1 (en) 1985-07-25
FR2492477B1 (en) 1985-01-04
PT73829B (en) 1983-01-25
US4456431A (en) 1984-06-26
PT73829A (en) 1981-11-01
ES269207U (en) 1983-06-16
EP0051005A1 (en) 1982-05-05
ES269207Y (en) 1984-01-16

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