Ventilator for the underground mines

VENTILATOR FOR THE UNDERGROUND MINES (from the Latin word "ventilo", which means to blow the air * EN: mine fan; DE: Grubenlufter; FR: ventilateur minier; ES: ventilador de mina; RU: вентилятор шахтный) is the device, which ensures the circulation of the air within the underground mine workings.

The ventilator for the underground mines is the component of the ventilatory installation. According to the principle of action, the ventilators for the underground mines are divided into centrifugal and axial, while according to the character of usage, these ventilators are divided into the ventilators for the main (they serve the entire underground mine, or the part of the mine) and local (each ventilator serves the stope within the preparatory mine working) ventilation. The centrifugal ventilator for the underground mines has been created during the 1832 by the Russian engineer A. A. Sablukov, and has been used during the 1835 for the airing of the Chigirskogo mine within the Altai region. Later, there has been developed and used by the same person the axial ventilator for the airing of the mine workings within the underground coal mines.

Within the centrifugal ventilator for the underground mines, the air flows through the collector and guiding apparatus into the channels between the vanes of the impeller. During the rotation of the latter, under the action of the centrifugal force, the direction of the movement of the air is changed by 90 degrees. The air moves along the spiral casing, and is directed into the exit hole, thus creating the excessive pressure at the exit from the diffuser. The air may flow to the impeller from one or two sides (the ventilator for the underground mines with the single-sided or double-sided suction). Within the axial ventilator for the underground mines, the air flows through the collector to the rotating impeller with the vanes, and further, while moving along the axis, through the guiding apparatus, second impeller and straightening apparatus, arrives into the diffuser, thus creating the excessive pressure at the exit from this diffuser. The axial ventilators for the underground mi nes, unlike the centrifugal ventilators, may be of the reversive type. The mover of the ventilator for the underground mines is electric, the mover of the ventilators for the local airing is electric and pneumatic. The pressure, which is created by the ventilator for the underground mines, and the performance of this ventilator, may be regulated continuously or stepwise, using the change in the frequency of the rotation of the impeller, using the rotation of its vanes and of the guiding apparatus. The maximal value of the performance, pressure, and efficiency of the axial ventilators for the underground mines is 650 cubic metres per second, 4.6 kilopascals, and 0.8 respectively, while of the centrifugal ventilators is 700 cubic metres per second, 9.2 kilopascals, and 0.86 respectively. For the increasing of the performance and developed pressure, they sometimes connect the ventilators for the underground mines using the parallel and sequential schemes. The further perfecting of the ventilators for the underground mines is associated with the possibilities for the increasing of the pressure, performance, reliability, decreasing of the level of the noise, without the increasing of the dimensions of the ventilators for the underground mines.