Stainless steel fan

Stainless steel fan, the overcurrent components of the fan (impeller, casing, air inlet) are made of stainless steel material, with a focus on rust prevention, corrosion resistance, and cleanliness. It is suitable for working conditions with high hygiene requirements such as water vapor, acid alkali mist, and is mostly centrifugal structure, commonly used in the 4-72, W4-72, F4-72 series.

1、 Common material differentiation

1. 304 stainless steel (the most common) is resistant to moisture, weak acids, food moisture, and general smoke, with a temperature of ≤ 200 ℃; Food processing, drying, ordinary acid and alkali waste gas, and wet dust removal are preferred, with high cost-effectiveness.

2. 316L stainless steel has strong resistance to chloride ions, resistance to seawater salt spray, dilute hydrochloric acid, desulfurization wet flue gas, and resistance to pitting corrosion; Chlorine salts, wet chemical processes, and seawater related working conditions.

3. 310S heat-resistant stainless steel is resistant to high temperatures and can withstand high temperature flue gas at around 500 ℃ for a long time; Hot air from high-temperature kilns, incinerators, and high-temperature corrosive flue gas.

2、 Classification and Applicable Scenarios

1. Ordinary 304 stainless steel centrifugal fan (4-72) for clean/humid gases at room temperature, air exhaust in food workshops, drying of medicinal herbs, bathroom dehumidification, and packaging waste gas.

2. High temperature stainless steel fan (W4-72 stainless steel version) transports high-temperature hot air, high-temperature water vapor, hot air circulation in the drying line, and low-temperature flue gas in the kiln.

3. Corrosion resistant stainless steel fan (F4-72 stainless steel) with weak corrosive waste gas, acid pickling, electroplating, and chemical waste gas, replacing the short board of fiberglass that is not resistant to high temperatures.

4. Explosion proof stainless steel fan with flammable and explosive gases/dust, lithium battery, pharmaceutical, alcohol vapor, equipped with explosion-proof motor.

3、 Whole machine structure

Stainless steel casing+stainless steel impeller+stainless steel air inlet+bearing box+common base

Impeller: Whole stainless steel plate laser cutting, argon arc welding, dynamic balance correction, optional weld polishing (food grade)

Main shaft: Carbon steel+stainless steel shaft sleeve to prevent medium contact and main shaft corrosion

Sealing: labyrinth/fluororubber seal; Food grade sealing components can be selected for food conditions, including stainless steel flanges, PTFE/fluorine tape anti-corrosion soft connections, spring shock absorbers, air dampers, and variable frequency control cabinets

4、 Core Features

1. Not easy to rust, resistant to corrosion from water vapor and condensation, avoiding material contamination caused by rust residue falling off from carbon steel fans

2. Smooth surface, not easy to accumulate dirt, easy to clean, meets clean and hygienic conditions

3. Material resistant to high temperatures, superior to PP and FRP plastic anti-corrosion fans

4. No heavy metal precipitation, polished version can be selected for the food and pharmaceutical industries

5. Can be designed for explosion-proof, suitable for volatile combustible gas working conditions

5、 Material selection reference

Moist air, food drying, general moisture: 304

Chloride containing ions, salt spray, desulfurization wet flue gas: 316L

High temperature corrosive flue gas at 400-500 ℃: 310S

6、 Key parameters for selection

1. Stainless steel grades: 304/316L/310S

2. Airflow, total pressure

3. Medium temperature

4. Media composition: water vapor, acid and alkali, chloride ions, dust

5. Do you need inner wall polishing (for food/medicine)

6. Is it explosion-proof and variable frequency

7、 Installation points

1. Corrosive working conditions with PTFE/fluorine adhesive tape soft connection, ordinary canvas cannot be used

2. Pipeline independent support, pipeline load cannot compress fan flange

3. The food working condition pipeline is easy to flush, avoiding dead corners and material accumulation

4. Install shock absorbers on the base to reduce vibration

5. Passivation treatment should be carried out at the welding position to prevent preferential corrosion of the weld seam

8、 Common faults

1. Insufficient passivation of welds, priority pitting corrosion of welds

2. Choosing the wrong material (304 for chloride ion working conditions) results in pinhole corrosion

3. The medium contains hard particles, and stainless steel blades are subject to erosion and wear

4. Seal aging, corrosive gas entering the bearing box and damaging the bearing