Oy Nokia Ab

Abb Installaatiot Oy

Oy Mercantile Ab

Abb Flakt Ab

Abb Flakt Oy

Seppo Juhani Leskinen

Ingmar Erik Rolin

Seppo Kalevi Kanninen

Olli J Pukkila

Esko Tapio Santavuori

Arrangement for cooling supply air in an air-conditioning installation

Method and arrangement for controlling heat transfer in ventilation

Mixing section for supply air and return air in an air-conditioning

Method and apparatus for heating building and ventilation air

Disclosed is a high-pressure centrifugal blower, which comprises an impeller with a back plate and pressure leveling blades secured to the back side of that back plate. The blades extend from the periphery of the impeller over some distance radially inwards. In order to regulate the pressure control clearance between the blades and the back wall of the blower case, control members have been installed between the blades and the back wall of the case.

High-pressure centrifugal blower

Disclosed is a centrifugal-blower impeller made from a back plate and a front plate and blades attached between these plates. The back plate or the front plate of the impeller or both of them are prestressed in a direction opposite to the stresses produced by centrifugal force when the impeller rotates. According to a preferred embodiment of the impeller the back plate is prestressed by means of a stressing member having the shape of a truncated cone, which is supported by the inner end of the hub of the driving shaft of the blower. In addition a stressing flange is attached to said hub and is tightened to the back plate by means of bolts. The front plate may be prestressed by means of a stressing ring mounted on the suction ring of the front plate.

Impeller in a centrifugal blower

Disclosed is an impeller in a centrifugal blower, especially a high-pressure blower, wherein the curved part of the front plate of the impeller is replaced by a conical supporting ring. The upper edge of the supporting ring is attached to the blades of the impeller and the lower edge to the cylindrical suction ring of the impeller. A guide ring made of thin plate is mounted inwards from the supporting ring.

Impeller assembly for a centrifugal blower

Disclosed is a centrifugal-blower impeller, which consists of a center part and radially outer part, which has a smaller thickness of material than the center part. The outer part consists of ring segments attached by welding to the periphery of the center part. The ring segments are first welded to the center part and thereafter radially to each other so that the ring segments are subject to tensile stress and the center part to compressive stress.

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Vasterskog, Finland

Seppo Juhani Leskinen