Abrégé

An axial air movement fan having a plurality of variable pitch fan blades (2), extending radially from a hub (4) rotatable about a main axis (3), each blade (2) further being pivotable about its radial axis to vary the blade pitch. The blades (2) each are mounted on an associated bearing (5) mounted on said hub, the bearing comprising a ball bearing having a first radially inner race (25) fast the blade (2) and a second radially outer race (26) rotationally fast to the hub (4). The balls (14) in the bearing are separated by separators (15), each separator being generally cylindrical and having its cylindrical axis coaxial with the orbital axis (22) of the orbit of the balls (14) and being adapted to rotate about the said orbital axis (22), the side faces of the separator each having a part spherical recess (16) adapted to receive a ball (14). Rotation of the separator (15) about the orbital axis (22) is such as to entrain lubricant in the bearing and to bias the lubricant from adjacent the outer race (26) over the balls (14) towards the inner race (25).

Classes IPC  ?

• F04D 29/36 - Montage des ailettes réglable
• F16C 33/372 - Organes d'espacement libres rigides
• F16C 33/37 - Organes d'espacement libres
• F16C 33/374 - Organes d'espacement libres élastiques
• F01D 25/18 - Systèmes de lubrification
• F04D 29/32 - Rotors spécialement adaptés aux fluides compressibles pour pompes à flux axial
• F04D 29/34 - Montage des ailettes
• F01D 25/16 - Aménagement des paliersSupport ou montage des paliers dans les stators
• F04D 29/063 - Lubrification spécialement adaptée aux pompes pour fluides compressibles
• F04D 29/06 - Lubrification
• F16C 19/20 - Paliers à contact de roulement pour mouvement de rotation exclusivement avec roulements à billes essentiellement du même calibre, en une ou plusieurs rangées circulaires avec organes d'espacement libres, p. ex. des billes entre les billes des roulements
• F04D 29/05 - Arbres, paliers ou leurs assemblages spécialement adaptés aux pompes pour fluides compressibles
• F16C 33/66 - Pièces ou détails particuliers pour la lubrification
• F16C 19/10 - Paliers à contact de roulement pour mouvement de rotation exclusivement avec roulements à billes essentiellement du même calibre, en une ou plusieurs rangées circulaires pour charges axiales principalement
• F04D 29/056 - Paliers

Abrégé

A method of detecting stall in an axial fan through acoustical measurements in air the air flow, includes measuring the sound emanating from the flow adjacent the fan, preparing a visual representation of the sound, comparing the visual representation with a library of fixed visual representations derived from a plurality of tests representative of the performance of the fan under a range of operating parameters, selecting the fixed visual representation most closely matching the visual representation of the said sound, and deriving a control signal from the selected fixed visual representation. The visual representations are formed by a symmetrised dot pattern (SDP) technique.

Classes IPC  ?

• F01D 21/02 - Arrêt répondant à une survitesse
• F04D 27/00 - Commande, p. ex. régulation, des pompes, des installations ou des systèmes de pompage spécialement adaptés aux fluides compressibles
• F04D 19/00 - Pompes à flux axial spécialement adaptées aux fluides compressibles

Produits et services

(1) Centrifugal fans; heavy duty fans; fans for general air movement, exhaustion of dust, for emergency smoke extraction and for the compression, exhaustion and transport of gases; fans for use in cement works, power facilities, steel works processing and petrochemical plants; compressed air engines; compressed air machines; fans for motors and engines. (2) Centrifugal fans.

Produits et services

Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs. Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes.

Produits et services

Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs.

Produits et services

Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs.

Produits et services

Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs.

Produits et services

(1) Variable pitch control blowers for regulating air flow and ventilators. (2) Industrial electric fans.