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1. Control local fans by the variable frequency technology, and attain the goal of intelligent gas emission;

2. Supply wind volume according to demand;

3. Avoid dust and improve the working environment;

4. The gas sampling is accurate, truly attain the intelligent emission;

5. Accurately control the emission process and avoid gas overrun;

6. Switch between two machines, ensure that the two machines are in hot standby state.

1. Asynchronous VFD's starting torque is large, which can reach 150% of the rated torque;

2. Synchronous VFD's starting torque is large, which can reach 200% of the rated torque;

3. Belt VFD starts on ramp, which can reduce the damage to the belt and drum when starting;

4. Synchronous direct-driven VFD is efficient and energy-saving, and the power saving efficiency can reach more than 20%;

5. Synchronous direct-driven system eliminates the decelerator, hydraulic coupler and other equipment, so that the overall efficiency of the system can be increased to more than 95%.

The BPJ Series Dual Frequency and Dual Power Explosion-proof and Intrinsically-safe Speed Regulation Device for Ventilators, one of leading products of Huaxin Company, is a kind of brand-new and fully-automatic firedamp drainage device, which is developed through adopting advanced vector control technology and efficient heat pipe thermal dissipation technology, and mainly used for controlling local ventilators for driving face of underground coal mine. It can automatically regulate the revolving speed of ventilators based on the gas density change so as to realize the purpose of safe, efficient and automatic firedamp drainage, which greatly reduces the gas accident rate; meanwhile, it has obvious energy-saving effect; therefore it is the first choice of automation equipment for coal mine safety production. 

1. Ambient temperature: 0℃ - +40℃ (32°F to 104°F);

2. Maximum average relative humidity: ≤ 95% (+25℃/77°F);

3. Atmospheric pressure: 80kPa-106kPa (+25℃/77°F);

4. No occasion with serious dripping and splashing in the surrounding;

5. Environment with explosive gases, such as methane and coal dust, but without corrosive gases.