Fans of VD-2,7, VD-3,5, VD-4,0, VD-9

Fans for General purpose are designed to move air and other gas mixtures, which aggressiveness towards carbon steels of ordinary quality above aggression of air with a temperature up to 80 °C, dust content and other solid admixtures not more than 0,1 g/m3 for radial fans and not more than 0.01 g/m3 for the axial fans, and not containing sticky substances and fibrous materials. Fans used in ventilation systems and air heating of industrial, public and residential buildings, and for other sanitary and industrial purposes. Mass-produced fans numbers from 2.5 to 20. Special fans Special fans are used for operation in pneumatic conveying systems for moving fluids containing aggressive substances, gases with high temperature, gas-vapor, explosive mixtures, etc. These fans can be divided into dust, corrosion-resistant, explosion-proof, small, ship, mine, mill, etc. Fans designed to move air with different particles, called dust. The designation of these fans added to the letter P. Dust fans designed to move non-explosive, non-abrasive dust-, gas-air mixtures, aggressiveness which in relation to carbon steel of common quality is not above aggression to air with a temperature above 80 °C, not containing sticky substances and fibrous materials with content of mechanical impurities in the transferred medium to 1 kg/m3. The movement of explosive gas mixtures fans General purpose is not permissible, since the friction of the impeller on the hull may cause sparks capable of igniting these mixtures. To move such mixtures must be used fans made of materials that, when friction or collision of moving parts with stationary parts would exclude the possibility of sparks. Fans of aluminum alloys are performed on a design 1 (GOST 5976-90) and are equipped with explosion-proof motors. In accordance with the technical specifications, they are designed to move some of the gas-vapor-air explosive mixtures do not cause accelerated corrosion of materials and coatings of the flow part of fans that do not contain explosives, explosive dust, oxides of iron plus oxygen, sticky substances and fibrous materials with dust content not exceeding 100 mg/m3 and the temperature not higher than 80 °C. ambient Temperature from -40 to +40°C (up 45°C for tropical execution). Fans of aluminum alloys cannot be applied to moving gas-vapor mixtures from processing units, in which explosive substances heat up above the temperature of their spontaneous ignition or are under excessive pressure. They are also not allowed to use as a chemically resistant fans. Fans of dissimilar metals are completed with explosion-proof motors. In accordance with the technical specifications they are designed to move certain steam-air-gas explosive mixtures, not causing rapid corrosion of materials and coatings flow of the fan, with a dust content not exceeding 100 mg/m3, not containing explosive dusts, explosives, sticky and fibrous materials. Fans of dissimilar metals cannot be used to move the vapor-gas mixture containing additional oxygen, and also to move the mixtures from process units, in which explosive substances heat up above the temperature of their spontaneous ignition or are under excessive pressure The possibility of using fans to move specific environments depending on their explosive properties, but also corrosion, chemical, temperature and dust effects on materials of the flow part of fans is determined by the design organizations of the customer. Explosion-proof fans is achieved through compliance to the design, manufacture and materials according to PB 03-590-03, equipment explosion-proof electrical equipment in accordance PUE and ensured working condition of the products in recognized normal modes. The choice of fan for hazardous conditions made the design organizations, the customer, on the basis of categories and groups roaming explosive mixtures according to GOST 12.1.011-78 and class of the area in the EMP. The list of mixes to move which meant the fans, given THAT 22-5698 – 84. To move the compounds, exploding on impact, the fans can not be applied. (In these cases, using ejectors. Centrifugal fans Classification and design of radial fans Depending on the magnitude of the total pressure the fans are distinguished: - low pressure - creates full pressure to 1000 PA; - medium pressure - creates full pressure from 1000 to 3000 PA; - high-pressure - creates full pressure from 3000 to 12000 PA. Depending on the magnitude of the circumferential speed of the impeller fans are divided into classes: - first class includes fans with forward curved blades with and < 30 m/s and fan with backward curved blades and with < 50 m/s, - the second class includes fans with forward curved blades and with > 30 m/s and fan with backward curved blades and at > 50 m/s. Depending on the direction of rotation of the fans are made of the right or left rotation. The fans are right rotation with the wheel rotating clockwise, the left rotation of a wheel, rotating counter-clockwise when viewed from the suction side of the fan. Fans from No. 2.5 and No. to 12.5, inclusive, is made with a swivel housings that allow installation in any of the provisions, and rooms higher than 12.5 are made with a swivel housings at the request of consumers. The position of the spiral housing is determined by the angle of rotation relative to the initial zero position. The rotation angles of the hull are measured in the direction of rotation of the impeller. Fans № 2,5; 3,15; 4; 5; 6,3; 8; 10 and 12.5 are produced with intermediate diameters of the impeller 90; 95; 100, 105 или110% of the nominal diameter which allows, without changing the body, change its characteristic. Depending on the location of the drive there are 7 of the embodiment.