Flameproof Antirotating Main Fan Large Axial Flow Fan for Mine

Characteristics
1. In order to meet the resistance requirements of the coal mine ventilation network and ensure the efficiency of the ventilator, the machine adopts the counter-rotating structure, that is, two sets of the same model of fans are connected to each other, and the rotation direction of the impellers of the two machines is opposite, which can save the middle guide vane and reduce the loss of the guide vane, thus improving the efficiency.

2. The form of the direct connection between the motor and the impeller is adopted, which changes the traditional structure of the long shaft of the mine main fan or the pulley drive, avoiding damage, and accident of the transmission device, and also eliminates the energy loss of the transmission device and improves the efficiency of the fan device. Due to its simple structure, in addition to regularly filling fuel to the motor bearings, it generally does not require maintenance and can be operated continuously for a long time.

3. When the motor power of this series of fans is less than 200KW, it is equipped with the YBF series of explosion-proof type motor of the derivative series of YB series, and the voltage is 380V, 660V or 1140V. When the power is above 200KW, it can be equipped with YBF series of 6000V high voltage explosion-proof energy-saving type motor according to the needs of the mine. The motor is installed in an airtight cover in the main air duct. The airtight cover has a certain pressure resistance. It can isolate the motor from the gas contained in the fan flow passage, and also has a certain effect of heat dissipation. The airtight cover is equipped with two rows of the streamlined air pipe, which are interlinked with the ground atmosphere through the main air duct so that fresh air flows into the airtight cover, and at the same time, the air in the cover can maintain a positive pressure state during the operation of the fan. Due to the use of various technical measures in the design, the motor is always working under the condition that the gas concentration is less than 1%, which meets the safety and explosion-proof requirements.

4. The highest unit of this series of fans can achieve the static pressure efficiency of 86%, the high-efficiency area is wide, and the static pressure efficiency is more than 70% of 70% or more working area. It can ensure that the efficiency of the main fan of the mine in the three mining stages is all above 75%, which has reversed the low operation efficiency of the main fan of large mines in China and saves a large amount of electric energy.

5. A steady flow ring is installed in the main air duct, the performance curve of the fan has no hump, no surge, and it can run stably under any resistance condition. The noise is low. Most models of this product have a noise of less than 90 dB (A) without a muffler. If the user has stricter requirements on noise, the product can be equipped with a muffler when leaving the factory.

6. All the blades of this series of fans can be adjusted, which can be divided into five working angles: 45°, 40°, 35°, 30 and 25°. The installation angles of the front and rear stages can be the same, or different, or can be adjusted to run at any angle below 45º. One of the fans can be operated separately, so the adjustable range is extremely wide. In the initial stage of production of the mine, it is ok to run only one class of the fan of it.

7. This series of fans are stable in operation and low in machine vibration. And the fans and diffusers are installed on the flatbed truck with wheels, which can run continuously for a long time.


8. The reverse wind can be reversed. In various working conditions, the reverse wind rate is all above 60%. There is no need for the reverse air duct, and only a need to build a simple ventilation machine room and an electric control duty room, which can save a lot of infrastructure investment.

Specifications and models
1. FBCDZ (formerly BDK62) series of fans have a total of 24 machine numbers of NO.14-NO.44. In order to meet the needs of large and medium-sized mines with various kinds of ventilation network parameters, this series of fans are respectively equipped with 6, 8, 10, 12-pole three-phase asynchronous motors, and two different types of blade number gradations are adopted: that is, the total number of FBCDZ (formerly BDK62) (A) blades is Z = 32 pieces, and the total number of FBDCZ (formerly BDK62) (B) blades is Z = 24 pieces. Through the above combination, the FBCDZ (formerly BDK62) series of fans have a total of 90 specifications. It solves the problem that the main fan model of the mine is small and the selection is difficult.

2. The working range of the static pressure efficiency of this series of fans above 70% is Q = 10.1~462.1 m³/S (that is, Q = 606 ~ 2772 m³/min), and the static pressure is Pst = 57.0 ~ 705.7 mmH₂O (that is, Pst = 559~ 6921Pa), which can cover the large and medium-sized mines with various kinds of mine ventilation network parameters, the operation static pressure efficiency of which can be all above 75%.
3. The representation method of the fan model                                  
4. The explosion-proof type of fan: the explosion-proof type for coal mine
The fan model and the matching motor power determination
In general, the fan model should be selected according to the most difficult period of ventilation in each stage of mine mining. At the same time, it is also necessary to consider the initial stage of mine mining which is under the condition of low negative pressure and small air volume, so it should also obtain more than 70% of the operation static pressure efficiency. In this way, it can give full play to the high-efficiency and energy-saving role of the FBCDZ (formerly BDK) series of fans.

For the mines with a very great difference in the mine ventilation network parameters in the three stages of mining, in the initial stage of the mining, it is ok to run only one class of the FBCDZ (formerly BDK) series of fans, and the other class can be used as the backup.

Under normal circumstances, when the FBCDZ (formerly BDK) fan is selected according to the three stages of mining, the operation efficiency of each stage should be above 75%, of which the most difficult period should be above 80%. If the fan with the above-mentioned operation efficiency cannot be found in the sample, you can contact our factory to adjust the parameters of the fan so as to achieve the above-mentioned conditions.

The motor power marked in Sample Table 2 is the maximum power of this type of fan. In general mine selection, the motor power should be equipped according to the actual ventilation parameters. The calculation method is:

N=.K(KW)

In which: N- the required motor power, refers to the total power (KW) of the I, II class fans;
P_st -the total resistance (Pa) in the most difficult period of the mine;
Q-the total air volume (m³/s) in the most difficult period of the mine;
η_st - check the actual operation condition efficiency of this sample according to the P_st and Q parameters;
K-the power reserve coefficient, generally K = 1.1~1.15;
Calculate the total power N according to the above, according to the value of N / 2, and refer to the motor power class series, select and equip with two sets of the same power motor, and must make N+N≤N. It is important to specifically point out that: when a certain model of the fan is selected and is calculated the N value according to the above formula, after selecting the motor N=N, it should be compared with the maximum power of the single motor power given in Table 2. If the value of N=Nis greater than the maximum power of the single motor given in Table 2, then this model of the fan is not applicable, and a larger size of the fan must be selected.

If the motor power required in the early and the later stages of the mine is greatly different, it can be compared economically. In the early stage, two motors with smaller power are equipped, and in the later stage, the motors are replaced with high-power ones. In this way, the motors can be operated under the condition of a higher power factor and higher efficiency, so as to reduce electricity consumption and save electricity costs.
The design service life of the FBCDZ (formerly BDK) series of fans is 20 years.

Installation
When the machine is shipped from the factory, it is the four pieces of the whole machine that leave the factory, which include the I-class fan, -the class fan, the diffuser, and the diffusion tower. The pressure test of the airtight cover has been carried out by the manufacturer in accordance with the technical standard requirements before leaving the factory. Therefore, it is generally not suitable for disassembly. If there is difficulty in moving it and must be disassembled, it can be installed by the on-site guidance of the manufacturer.
During the installation, the collector must be placed in the fresh air, so that the air inside the airtight cover does not contain gas.

The ground of the fan installation site should be flat, and according to the gauge in the sample schematic diagram, the auxiliary steel rail should be set, and the 24-38 Kg / M light rail can be selected and used. The steel rail can be pre-embedded on the cement floor surface or fixed on the sleeper.


Test run and operation
Before the fan is installed, the blade should be adjusted first according to the required angle, and all the screws should be tightened. The motor can be refueled at any time during operation. When in operation, the current, the voltage, the motor bearing, and the temperature indicating the instrument of the motor stator should be frequently observed and recorded well. If it exceeds the required index of the technical requirements, it should be immediately stopped for checking.
During the overhaul of the machine, the sealing gasket of the airtight cover should be carefully kept and must not be damaged. Once damaged, it should be purchased from the manufacturer.

Shandong Huayu Metal Materials Co., Ltd. is a professional, reputable manufacturing enterprises. The company is mainly engaged in steel plate, steel pipe, stainless steel products, all kinds of fans, ventilation and environmental protection equipment, tunnel, mine ventilation equipment, etc. Our products are mainly exported to South America, Southeast Asia, Africa, Russia, Turkey, the Middle East and other countries.
My company has abundant capital, large inventory, complete specifications, timely delivery, low quality and low price, by the majority of users. The production of stainless steel products and ventilation and environmental protection equipment are widely used in electric furnace, boiler, decoration, solar energy, electric heating equipment, chemical, textile, printing and dyeing, pharmaceutical, food, machinery equipment, Marine equipment, pressure vessels and other industries, welcomed by the majority of customers.
We have many years of production and research and development experience, can customize all steel products and ventilation equipment according to the needs of customers. The company always adhere to the following business principles: to win the market with high quality products; Competitive price to attract customers; Excellent service wins reputation; Well-known brands increase value. Sincerely welcome friends from all over the world to establish long-term business friendship.

If out of our warranty period, our company also provides spare parts to the buyer at the most favorable price, guarantees to provide technical services for the equipment sold timely and with high quality, and the after-sales technical service is free for life, guarantees to arrive at the buyer's site for repair and technical guidance

FAQ
What parameters should be provided when purchasing the fan?
A: Air flow rate(m3/h), Total pressure(Pa) or Static pressure(Pa), Inlet temperature(°C), Voltage and frequency on the working site.
2. Q:What is your delivery time?
 A:15-35workdays, depending on the model of the fan.
3.Q:What's your MOQ?
A:The MOQ is 1set,but larger quantity, lower price.
4.Q: What's your warranty?
A: 12 months after arrival of the goods on site.
5.Q:How do you control the product's quality?
A:All the products have quality testing and dynamic balance before delivery.