SU1216456A1 - Actuator of fan blade turning mechanism - Google Patents

Description

one

The invention relates to a fan-toro-construction and, in particular, to a hydraulic actuator of the mechanism for turning the working blades of an axial-flow fan.

The purpose of the invention is to increase reliability in operation.

Figure 1 shows an axial flow fan; FIG. 2 shows section A-A in FIG. 1, FIG. 3 shows unit I in FIG. 1 in FIG. 4, section BB, in FIG. 3, FIG. 5, section B-B in FIG. H.

The hydraulic actuator of the rotation of the working blades 1 of the fan contains a hydraulic cylinder 2 mounted in the sleeve 3 and kinematically connected with the blades 1, and an electric heating element made in the form of a motor stator 4 placed concentrically on the shaft 5 of the fan, and two ring headers 6 and 7 In communication with the hydraulic cylinder 2, the collectors 6 and 7 are located inside the stator 4 on the shaft 5 and are hydraulically interconnected by means of tubes 8 made of electrically conductive material. The tubes 8 are evenly spaced on the shaft 5 along a helical

562

the lines are electrically insulated from the latter by insulation 9. Hydraulic cylinder 2, collectors 6 and 7 and tubes 8 are filled with working fluid. The stator 4 contains a winding 10. The hydraulic actuator can be equipped with an additional hydraulic cylinder 11 and the stator 12, which contain similar devices and are interconnected by similar connections.

During operation of the fan, when the operating mode is changed, an electric current is passed through the windings 10 and an electromagnetic field is created in the zone of the tubes 8, as a result of which the induced electrical current flows through the tubes 8, which causes them to heat up. The heat from the tubes 8 passes into the working fluid, expands it, as a result of which the hydraulic cylinder 2 rotates the blades 1 through the kinematic link by a given angle.

When executing a hydraulic drive with two hydraulic cylinders 2 and 11, the latter returns the blades 1 to the initial position.

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FIG. g

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Compiled by Y.Antipov Editor M.Blanar Tehred T.Tulik Proofreader G. Reshetnik

Order 980/42 Circulation 610 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

FIG. five

Claims (1)

A HYDRAULIC DRIVE MECHANISM FOR TURNING THE WORKING BLADES OF THE AXIAL FAN, containing a hydraulic cylinder mounted in the sleeve and kinematically connected with the blades, and FIG. The electric heating element is characterized in that, in order to increase reliability in operation, the electric heating element is made in the form of a stator of an electric motor placed concentrically to the fan shaft, and two ring collectors in communication with the hydraulic cylinder located inside the stator on the shaft and hydraulically connected with each other using tubes made of electrically conductive material, evenly spaced on the shaft along a helix and electrically insulated from the latter.