EXHAUST AND DRAFT MACHINES TYPE DN, VDN

Blowing (exhaust) fans DN and VDNare designed to move air and non-explosive non-aggressive gas-air mixtures with temperatures from -30 ° С to + 200 ° С, dust content up to 0.1 g / m3, free of sticky, fibrous and abrasive inclusions. Blowing fans are used to supply air to the furnaces of stationary steam and hot water boilers, in ventilation and air conditioning systems, etc.

The axial guide devices have a cylindrical body, flat segmental blades with radial axes located inside it evenly around the circumference, and a mechanism for synchronous rotation of the blades around their axes. The blades of the guide device decrease or increase the flow area and swirl the flow of the transported medium in the direction of rotation of the impeller. This allows the aerodynamic performance of the machine to be varied and its performance to be economically adjusted. The body is spiral all-welded or split from all-welded sections. The body is manufactured with a turning angle from 0 ° to 270 °, with an interval of 15 °. The body has a round inlet and rectangular outlet with flanges. An inlet pipe is attached to the inlet. The inlet branch pipe is designed to form a flow at the inlet to the impeller. The impeller is radial (centrifugal), welded. The wheel consists of 16 backward curved blades, conical front and flat rear blades and a nave. The direction of rotation of the wheel is right or left. The impeller is mounted on the motor shaft or on the mid-shaft of the chassis.