The working principle of the fan is basically the same as that of the turbo compressor, but because the gas flow rate is low and the pressure does not change much, it is generally not necessary to consider the change of the specific volume of the gas, that is, the gas is treated as an incompressible fluid. The relationship between fans and fans: Fans are the abbreviations for gas compression and gas transportation machinery in China. Generally speaking, fans include fans, blowers, compressors, and roots blowers, but do not include volumetric blowers such as piston compressors and compressor. Ventilator is a product type of fan, but people usually call the ventilator simply as a fan, which is another name for a fan. The ventilator is a machine that relies on the input of mechanical energy to increase the pressure of the gas and exhaust the gas. It is a driven fluid machine. Ventilator is widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings for ventilation, dust extraction and cooling; ventilation and induction of boilers and industrial furnaces; cooling and cooling in air conditioning equipment and household appliances Ventilation; drying and sending of grain; wind tunnel wind source and inflation and propulsion of hovercraft.
The impeller is the main component of the fan. Its geometry, size, number of blades and manufacturing accuracy have a great impact on performance. The impeller must be corrected by static balance or dynamic balance to ensure the fan to rotate smoothly. According to the direction of the blade exit, the impeller is divided into three types: forward, radial and backward. The top of the blade of the forward impeller is inclined toward the direction of rotation of the impeller; the top of the blade of the radial impeller is radial, and is divided into straight and curved blades; the top of the blade of the backward impeller is inclined in the reverse direction of the rotation of the impeller. The working principle of the fan is basically the same as that of the turbo compressor, but because the gas flow rate is low and the pressure does not change much, it is generally not necessary to consider the change of the specific volume of the gas, that is, the gas is treated as an incompressible fluid.
In order to ensure the normal operation of the main fan and reduce economic costs, the first choice of fan model must be scientific and reasonable. In recent years, no matter whether it is a mine expansion or a new coal mine design and construction, many coal mining companies have paid attention to selecting some highly efficient ventilators to ensure that the newly-used ventilation instruments are energy-efficient and efficient. In the design of the mine, most of the electrical equipment and the main ventilator are selected according to the maximum demand for air volume and negative pressure in the easy and difficult periods of air supply . At the initial stage of production, the production scale is small and the output is low. Some coal mines are affected by geographical conditions. The design production volume is significantly different from the actual production volume. Therefore, enterprises can use the method of replacing low-power and low-speed motors according to actual production needs. Increase the motor operation load rate to achieve economic operation.
Coal mine ventilator system is a key component of the coal mine production system. Ensuring good ventilation in the mine is the primary condition for safe and stable production. The main fan used in the mine must be efficient, stable, and adaptable to the ventilation system used. The ventilation system used should be simple, complete, highly efficient, and stable, and sufficient fresh air should be sent to the point of use. The ventilation resistance section in the mine is reasonable and easy to adjust. It can be used for independent ventilation and restrict or minimize series ventilation. Only meeting the basic conditions described above can the mine be properly ventilated and prevent major coal dust and gas accidents.
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