EXHAUST AND DRAFT MACHINES Д, ВД

Smoke exhausters Д и ВД are designed to move flue gases and non-explosive dust and gas mixtures with temperatures from -30°С to + 200°С, dust content from 0.1 g/m³ to 2 g/m³.

The abrasiveness of the dust contained in the transported medium, and its tendency to sticking should not exceed similar indicators of flue gas ash.

Smoke exhausters are used to remove flue gases from furnaces of stationary steam and hot water boilers and for moving dust and gas-air mixtures in processing plants, etc.

The design of the draft and exhaust machines contains an axial guide vane, a housing, an inlet socket, an impeller, a frame and a motor. In addition, depending on the design, they can contain a running gear, a clutch and pulleys with a V-belt transmission.

The axial guide vane has 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 vane decrease or increase the flow area and swirl the flow of the transported medium in the direction of rotation of the impeller. This allows to change the aerodynamic performance of the machine and adjust its performance economically.

The unit body is spiral all-welded or split from all-welded sections. The casing is manufactured with a taper angle from 0° to 270°, with an interval of 15°. The casing has a round inlet and rectangular outlet with flanges. An inlet pipe is attached to the inlet.

The inlet socket is designed to form a flow at the inlet to the impeller.

The impeller is radial (centrifugal), welded. The impeller consists of 32 forward curved blades, tapered front and flat rear discs and a hub. The rotation direction of the impeller is right or left. The impeller is mounted on the motor shaft or on the intermediate shaft of the chassis.