VME
| VMEu-6 | VME-6 | VME-5 | VME-4 | |||
|---|---|---|---|---|---|---|
| ID | id31394-1-1-1 | id31394-1-1-1-1 | id31394-1-1 | id31394-1 | ||
Area of application of local ventilation fans
Creation of safe working conditions in mines and mines necessarily includes measures to ventilate mine workings. In order to improve working conditions and efficiently use production facilities, measures should be taken to remove mine gas and dust, as well as to reduce temperature and humidity in mining operations. Mine and mine ventilation systems can solve these problems. Local ventilation fans are one of the main components of mine ventilation systems. VME mine fans for local ventilation are designed to organize ventilation of dead-end mine workings of coal and ore mines. To organize ventilation, a flexible or rigid pipeline is used, the length of which can reach 2500 m, and the diameter is in the range from 60 cm to 120 cm. Fans of this type are used for suction or pressure ventilation.
Main characteristics of local ventilation fans
Local ventilation fans of the VME series are installed in the ventilation systems of dead-end mines, where the temperature can vary from minus 20ºС to plus 35ºС, humidity can reach 95%, and dust content – 50 mg/m3. Air density in production is allowed up to 1.3 kg/m3. Fans of this series are made in an explosion-proof version. In the design of the fans, explosion-proof asynchronous motors are used, in which the rotor is short-circuited. The motor casing corresponds to the degree of protection IP54 and is able to withstand the pressure from the explosion of gases inside the motor housing.
Design of local ventilation fans
The design of the local ventilation fan includes a casing, an electric motor with a terminal box, an impeller, a nozzle, a collector and a sled. The nozzle is equipped with an anti-rupture device. Regulation of the pressure developed by the fan in the working area is possible by turning the blades of the impeller and is done with the fan stopped. With a long length of mining, it is allowed to connect two fans in series. Thermal protection in case of an increase in its temperature and vibration protection in case of increased bearing vibration are built into the fans. Fans of the VME series must be installed horizontally. The deviation from the horizontal axis should not exceed 30º. There are two options for controlling the fan: automatic and manual control. Local ventilation fans of VME are able to work in normal and reversible modes. By changing the number of revolutions of the engine, or turning the blades on the go, you can adjust the fan supply. In case of emergency shutdown of the main fan, automatic connection of the backup fan is provided. The design of the fan provides for a backup low-voltage input, which is automatically turned on when the main one is lost. In the event of a short-term power outage, the fan drive automatically turns on again. The fan is reversed without stopping the fan. If an emergency situation occurs, the ventilation unit will automatically shut down, and sound and light signals will be given to the dispatcher.
Advantages of local ventilation fans
VME mine fans for local ventilation are economical. The blades of their fans are made of non-combustible materials. The design and dimensions of the installations allow for ventilation of even small mining operations. If there are long pipelines, it is allowed to connect two or more fans in series. Fans of the VME series are designed for long-term, continuous round-the-clock ventilation. If desired, they can be equipped with noise suppressors.