Medium-temperature resistant centrifugal fan

Core Advantages: Designed for high-temperature environments, achieving stable transportation of high-temperature gases through material and structural optimization, widely used in industrial high-temperature scenarios.

Key Technical Features

1. High-Temperature Resistant Materials

- Impeller: Made of stainless steel (304/310S), heat-resistant cast iron (HT250), or alloy materials (such as nickel-chromium alloy), with a temperature resistance range of 200°C~1200°C (depending on the material).

- Casing: Outer layer is insulated steel plate, inner layer is lined with refractory material (such as ceramic fiber), reducing shell temperature and heat loss.

- Shaft and Bearings: Main shaft made of high-temperature resistant alloy steel, bearings configured with high-temperature grease (such as molybdenum disulfide) or water-cooled/air-cooled bearing boxes to prevent wear or seizing under high temperatures.

2. Cooling System Design

- Air-Cooled Type: Forced cooling via external fans or casing heat sinks, suitable for 300°C~600°C scenarios.

- Water-Cooled Type: Water circulation pipes built into the bearing box or motor, paired with coolers to reduce temperature, suitable for high-temperature environments above 600°C.

3. Structural Reinforcement

- Impeller Dynamic Balance: Impellers are prone to thermal expansion deformation under high temperatures; they undergo high-precision dynamic balance calibration before leaving the factory to reduce vibration.

- Sealing System: Uses graphite rings or metal bellows seals to prevent high-temperature gas leakage and avoid external dust intrusion.

Performance Parameters and Applications

- Temperature Resistance Range:

- Standard Type: 200°C~800°C (e.g., 304 stainless steel impeller);

- High-Temperature Type: 800°C~1200°C (requires custom alloy impeller + water cooling system).

- Typical Applications:

- Industrial Kilns: High-temperature flue gas extraction or ventilation for boilers, forging furnaces, annealing furnaces.

- Thermal Engineering: Waste heat recovery systems in power plants, steam pipeline ventilation.

- Chemical/Building Materials: Hot gas emission from chemical reactors, ventilation for cement plant rotary kilns, hot air circulation in glass furnaces.

- Environmental Equipment: High-temperature flue gas transportation for waste incinerators, exhaust gas treatment equipment.

Selection Considerations

1. Temperature Matching:

- Confirm medium temperature and ambient temperature to avoid premature damage due to improper material selection (e.g., 304 stainless steel resists temperatures ≤800°C, 310S up to 1150°C).

2. Gas Characteristics:

- For dust-containing gases, select wear-resistant impellers (e.g., surface hardfaced with hard alloy); for corrosive gases, use anti-corrosion coatings (e.g., epoxy resin).

3. Installation Requirements:

- Pipelines must reserve thermal expansion compensators (e.g., bellows expansion joints) to avoid pipeline deformation and cracking at the fan interface under high temperatures.

- For horizontal installation, ensure normal oil level in the bearing box; for vertical installation, pay attention to the bearing load direction.

4. Auxiliary Functions:

- For ultra-high-temperature scenarios (>600°C), it is recommended to equip temperature monitoring devices for real-time monitoring of bearing and motor temperatures.

Common Model Examples

- Standard High-Temperature Type: Such as 4-72 high-temperature type (temperature resistance ≤250°C, used for kitchen油烟 exhaust).

- Medium High-Temperature Type: Such as Y5-48 boiler induced draft fan (temperature resistance ≤400°C, suitable for coal-fired boilers).

- Ultra High-Temperature Type: Such as G4-73 high-temperature fan (custom alloy material, temperature resistance up to 800°C or above, used for metallurgical kilns).