Vacuum cleaner explosion-proof medium pressure blower, air film cabinet, oil-free operation, blowing and suctionBasic principle of explosion-proof fan

1. The concept of explosion

In a very short period of time, it releases a large amount of energy, generates high temperature, and releases a large amount of gas, causing high-pressure chemical reactions or state changes in the surrounding medium. The rapidly released energy will cause violent impact and damage to surrounding objects. The three conditions that must be met for an explosion are: 1) Explosive substances: substances that can react with oxygen (air), including gases, liquids, and solids. (Gas: hydrogen, acetylene, methane, etc.; Liquid: alcohol, gasoline; Solid: dust, fiber dust, etc.) 2) Oxygen: air. 3) Ignition sources: including open flames, electrical sparks, mechanical sparks, electrostatic sparks, high temperatures, chemical reactions, light energy, etc.

2. Reasons and considerations for explosion-proof blower

Explosive substances: Many production sites produce certain flammable substances. About two-thirds of the underground coal mines contain explosive substances; In the chemical industry, over 80% of production workshop areas contain explosive substances. Oxygen: Oxygen in the air is ubiquitous. Ignition source: Electrical instruments are widely used in the production process, and various frictional sparks, mechanical wear sparks, electrostatic sparks, high temperatures, etc. are inevitable, especially when instruments and electrical components fail. Objectively, many industrial sites meet explosive conditions. When the concentration of explosive substances mixed with oxygen is within the explosive limit range, if there is an explosion source, an explosion will occur. Therefore, it is necessary to adopt explosion-proof measures.

Special corrosion-resistant, anti-corrosion, explosion-proof medium pressure fanMaintenance and upkeep：

1）Explosion proof blowerThe internal mechanism is relatively tight, with a small gap between the impeller and the casing, so it is necessary to filter out debris and dust. For miscellaneous items, a fine filter screen is usually installed at the air inlet. For dust, a filter is often used. It often uses filter cartridges with different filtration accuracies according to different usage scenarios. Different filter cartridges have different maintenance methods and service lives, which need to be clarified when ordering.

2）Explosion-proof fanThe motor is directly connected to the impeller and belongs to high speed. The bearings need to be regularly maintained with grease to prevent damage (including the impeller bearings).

3) The shaft power and pressure of a motor are directly proportional. To prevent long-term extreme pressure from increasing shaft power and overloading the motor, a pressure relief valve is often used. It is an unloading valve. When the operating pressure of the air pump exceeds the set pressure of the pressure relief valve, the pressure relief valve will automatically open to release the excess pressure and protect the motor of the air pump.

4) In some special occasions, special protection is also necessary: for example, when using in a sealed environment, attention should be paid to ventilation and heat dissipation; When the ambient temperature (intake temperature is relatively high), it is more important to pay attention to ventilation and heat dissipation, or choose a vortex air pump that allows for a higher intake temperature

Classification of anti-corrosion and explosion-proof blower motor products:

1. Classified by motor principle
It can be divided into explosion-proof asynchronous motors, explosion-proof synchronous motors, and explosion-proof DC motors.
2. Classified by usage location
It can be divided into explosion-proof motors for underground coal mines and explosion-proof motors for factories.
3. Classified by explosion-proof principle
It can be divided into explosion-proof motors, increased safety motors, positive pressure motors, variable frequency motors, spark free motors, and dust explosion-proof motors.
4. Divided by matching motors
It can be divided into explosion-proof motors for coal mine transport aircraft, explosion-proof motors for coal mine winches, explosion-proof motors for rock loaders, explosion-proof motors for local fans in coal mines, explosion-proof motors for valves, explosion-proof motors for fans, explosion-proof motors for ships, explosion-proof motors for lifting and metallurgy, and increased safety brushless excitation synchronous motors for hydrogen refueling equipment. In addition, it can also be classified according to technical indicators such as rated voltage and efficiency, such as high-voltage explosion-proof motors, high-efficiency explosion-proof motors, high slip explosion-proof motors, and high starting torque explosion-proof motors.

Parameters of medium voltage explosion-proof fanInstructions and Conditions for Use and Installation:
Before installation, it is necessary to familiarize oneself with the various technical requirements in the manual, check whether the accompanying accessories are complete, and whether various technical documents are complete.
2. Conduct a preliminary inspection of the blower to ensure that there are no inorganic parts damaged during logistics transportation or long-term storage, whether there are any debris falling into the fan flow channel, and whether there is corrosion. Then use tools to rotate the fan spindle or the fan motor tail fan blades to see if the rotation is flexible and if there is any rubbing noise. Otherwise, the fault should be eliminated first.
3. According to the foundation diagram, the anchor bolts should be properly positioned. When installing the fan, the horizontal plane should be corrected to prevent excessive tilting.
4. The diameter of the pipeline should be slightly larger than the fan outlet diameter (the ratio of pipeline diameter to fan outlet diameter is 1.1:1), and the length of the pipeline should be shortened as much as possible. Elbows should be used sparingly, and the angle of the elbow should be greater than 90 degrees. It is not allowed to use right angle T-shaped joints. The joints of the pipeline should be tightly sealed and not leak, in order to reduce pressure loss. The weight of the pipeline shall not be supported by the fan, nor shall the fan be forcibly connected to the pipeline to prevent increased vibration and noise.
5. According to the characteristics of the blower, regulating valves can be installed at the inlet or outlet of the blower. Adjustment of air volume and pressure.
To protect the fan motor, a current overload protection device should be installed.
7. Close the air inlet of the fan, try starting the fan, and check if the main shaft rotation of the fan is correct. Then restart the fan and gradually open the regulating damper to the desired operating point after normal operation. However, the motor current should not exceed the rated value. If the desired operating point happens to be the fan's surge point, the operating point should be adjusted appropriately to avoid the surge point or other anti surge measures should be taken.

Explosion proof medium voltage fanThe need for maintenance.
1) When setting up the fan, it should avoid environments with high dust, corrosive gases, high humidity, direct sunlight, and wind and rain. The ground around the fan should be kept clean. The fan is equipped with an electric motor that has high requirements for the surrounding environment. Often, its performance may be reduced due to the aforementioned reasons, so special attention should be paid.
2) When the fan is installed indoors The structure of the house should be spacious and have doors that are wide and high enough to facilitate the movement and transportation of fans.
3) There must be sufficient space around the fan for operation Personnel can walk freely and meet the needs of daily maintenance and upkeep.
4) The installation location of large fans Consider leaving space for the placement of components such as the casing, rotor, intake box, and regulating door, as well as for assembly, disassembly, maintenance, and other operations. The fan adopts belt drive, and the space for motor alignment and pulley replacement also needs to be considered.
5) When determining the layout of the fan Not only should the installation space of the fan itself be considered, but also the layout space for inlet and outlet pipelines, valves, wiring of the prime mover, oil supply devices, cooling devices, and connecting pipelines for oil and water should be reserved
6) When setting up multiple wind turbines at the same location The mutual spacing and layout between fans should be fully considered to avoid mutual influence during fan operation
7) For large and heavy fans Should be equipped with lifting devices such as cranes and electric hoists; Small and medium-sized fans are equipped with general lifting devices according to their purposes, such as frequent replacement of impellers.

Vacuum cleaner explosion-proof medium pressure blower, air film cabinet, oil-free operation, blowing and suctionExplosion proof medium voltage fanStructure description:

2.1 The explosion-proof structure of the electric fan has Ex dI, Ex dIIAT4, and Ex dIIBT4.

2.2 The protection level of the main body shell of the electric fan is IP55.

The cooling method of the electric fan is IC411.

2.4 The insulation level of the electric fan is F level, and the stator winding has a large temperature rise margin and a long service life.

The 2.5 electric fan has a cylindrical shaft extension, which is driven by a coupling or gear.

2.6 The stator winding of the electric fan adopts high-strength enameled round copper wire, which is vacuum pressurized and immersed in paint to form a complete whole. The winding and insulation have good electrical, mechanical, moisture-proof performance and thermal stability.

2.7 The rotor of the electric fan adopts a cast aluminum structure, and the rotor has undergone dynamic balance verification. The motor runs smoothly, with low vibration and noise.

2.8 The stator and rotor blades of the electric fan are made of high-quality electrical silicon steel sheets with high magnetic conductivity and low loss, resulting in low motor loss and high efficiency.

2.9 The bearings for the electric fan are selected as low vibration and low-noise bearings for the motor. Double sided sealed bearings are used for machine seat sizes 160 and below, and waveform spring washers are installed at the shaft extension end to provide moderate pressure against the bearings and effectively suppress the vibration and noise generated during motor operation. For machine seat sizes 180 and above, inner and outer cover structures are used, and retaining rings are used for axial fixation at the bearing locations to effectively prevent axial movement of the motor rotor.

For the safe and reliable operation of electric motors, the bearing structure of motors with a base size of 180 and above is equipped with an oil injection device. For motors with a base size of 250 and above, a position for bearing temperature monitoring sensing elements is reserved.

2.10 Motor fan and fan cover: Motors with a base size of 280 and below use anti-static plastic fans, which have low rotational inertia and low loss. Motors with a base size of 315 and above use cast aluminum or steel plate welded fans, which are lightweight and strong. The entire series of fans are connected to the shaft with critical connections, ensuring reliable operation. The wind cover is made of steel plate structure, which provides a large ventilation area while preventing the intrusion of foreign objects of a certain size, ensuring smooth air flow.

Medium voltage explosion-proof fanSelection:

The fan is a medium pressure fan, also known as a through type blower, not a high-pressure fan. Remember this.

After knowing the suction volume and pressure, you can make a selection based on the performance table
The standard voltage is 3-phase 380 VOLTS. If different voltages are required, our company can also provide them

A、 The selection of fan pressure and air volume, such as how many cubic meters per minute and how many pascals of pressure are required.

Explosion proof fans have three phases, such as FB-3, so when selecting, it is important to inform the salesperson to avoid making the wrong choice and causing inconvenience.

B、 If you know the power of the fan, it's good. If you don't know, you can choose based on the air volume and ask the salesperson to recommend it.

high temperature resistanceExplosion proof medium pressure blowerSuitable for: chemical plants, coal mines, tunnels, boilers, canning, glass industry, ventilation and exhaust, automatic cleaning, packaging, fish pond oxygen supply, aeration, garbage decomposition, gas transportation, combustion oxygen reduction machine, molding machine, electroplating tank liquid mixing, atomization dryer, water treatment aeration, aquaculture, screen printing machine, photographic plate making machine, injection molding machine, automatic feeding and drying machine, liquid filling machine, powder filling machine, welding equipment, film machinery, paper transportation, dry cleaning clothes, cleaning purposes, air dust removal, dry bottles, gas transportation, chemical plants, coal mines, glass industry, fireworks and firecrackers, special places, pharmaceutical factories, etc.