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BPJ1 Dual Fan Variable Frequency Drive

Aiming at the problem that the gas density in main lane is out of limit due to “one-off” firedamp drainage because of constant-speed revolving of the ventilator, Huaxin Electric Co., Ltd. successfully develops the flameproof and intrinsically-safe speed regulation device with dual frequency and dual power for ventilators (hereinafter referred to as the dual-frequency BPJ).

The dual-frequency BPJ is designed as two integrated and independent flameproof boxes. It has two sets of relatively independent frequency conversion control systems and integrates them with the switch control system of dual microcomputers. The dual-frequency BPJ can simultaneously control two ventilators, which can be mutual backup, or master-slave. These two sets of frequency conversion control systems can automatically regulate the revolving speed of the ventilator based on the gas density change, and supply air as required; in addition, under the circumstance that the gas density is not out of limit, they can arbitrarily and automatically switch with flexible and diverse, safe and reliable switching modes; thus the continuous air supply for working face can be maintained so as to ensure safe firedamp drainage. Because both main and standby fans can realize the purpose of adjusting air quantity based on gas density, the problem of huge energy loss caused by full-load constant-speed revolving of ventilator is solved comprehensively with very obvious energy-saving effect.

Technical parameters
Product advantage
Overall dimensions
Product features
Purpose
Use conditions

Product model	BPJ1-110/660SF	BPJ-160(110)/1140SF
Explosion prevention type	ExdΙMb
Rated power	2×110KW	2×160(110)kW
Rated operating voltage	Three-phase 660VAC	Three-phase 1,140VAC
Voltage fluctuation range	560~790VAC	920~1370VAC
Rated current	120A	95(60)A
Output voltage	0~660VAC	0~1140VAC
Output current	0~120A	0~95(60)A
Output frequency	0
Carrier frequency	2kHz	1.5kHz
Working system	Long term working system
Cooling mode	Natural cooling
Control motor	Asynchronous motor

1. Control the variable frequency of local fan, and realize the intelligent gas emission;

2. Supply wind according to demand, to avoid the “one-off”;

3. Avoid dust and improve the working environment;

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

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

6. Realize the switching between two machines, to ensure that the two machines are in hot standby state.

Specification & model	Overall dimensions mm	Weight Kg
BPJ1-110/660SF	1320×880×1005	500
BPJ-160(110)/1140SF	1645×1267×1275	2100

1. Asynchronous frequency converter’s starting torque is large, which can reach 150% of the rated torque

2. Synchronous frequency converter’s starting torque is large, which can reach 200% of the rated torque

3. Belt frequency converter starts on ramp, to minimize damage to the belt and drum when starting

4. Synchronous direct-driven frequency converter is efficient and energy-saving, and the power saving effect 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 flameproof and intrinsically-safe speed regulation device for ventilators, one of leading products of Huaxin Company, is a kind of brand-new and full-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.   Environment temperature: 0℃- +40℃；

2.   Maximum average relative humidity: ≤95% (at +25℃);

3.   Atmospheric pressure: 80kpa-106kpa (at +25℃)；

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

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