wind tunnel, with the formation of an eddy flow transverse potential led inside the rotor

摘要

963,015. Transverse-flow blowers. T. HELMBOLD. Jan. 5, 1961 [April 8, 1960; June 3, 1960], No. 472/61. Heading F1C. In a transverse-flow blower with a guided standing vortex forming itself during operation, an essentially trough-shaped guiding body adapted in form to the vortex and serving to maintain it in position is arranged within the blower rotor in the region between the inlet and outlet channels. A cylindrical free vortex is formed in the flow through a transverse-flow blower by means of a trough-shaped stationary guide member 2, Fig. 2, located within the blower impeller 1, the outermost face of the guide member covering rather more than one pitch of the impeller blades. The guide member 2 may be of V or like angular shape. For the purpose of regulating the blower, the guide member 2 and an external guide member 10 may, as shown, be mounted on an arm 9 pivoted about the blower axis 3. The arm 9 also carries a cylinder 11 located at the centre of curvature of the member 2 and forming to some extent the core of the vortex. The cylinder 11 revolves with the vortex or may be positively driven in the direction of rotation of the vortex. The impeller shaft is surrounded by a freely rotatable hollow cylinder 12 which reduces the disruptive effect of the shaft on the flow. In a modification, the member 2 has two troughs, whereby two vortices are formed. The two troughs may be formed by a T-shaped member. Fig. 5 shows a multi-stage blower comprising three impellers 1 in series within a common housing 26. Each impeller is provided with two vortex-forming members 2, 15 carried by discs 19 at their ends and, if necessary, between their ends. In the three-stage blower shown in Fig. 6, the impellers 1 are arranged at equal distances from a rotatable cylinder 20 which can be constructed as or incorporate an electric motor which can also drive the impellers. If the cylinder 20 rotates in the same direction as the impellers, flow guides 21 extending over at least one impeller blade pitch may be interposed between it and each impeller. The inlet 22 is separated from the outlet by a partition 24 having an adjustable part 25 affording a variable by-pass.