It looks like you're describing a specific industrial equipment configuration. Let me break down the terms you've provided and clarify what this assembly likely refers to:
Q345 (Material)
- A Chinese standard low-alloy high-strength steel (similar to ASTM A572 Gr.50 or S355JR).
- Used for the coupling or the fan housing/impeller because of its good strength, toughness, and weldability.
- Indicates the part is built for durability in demanding environments like ovens.
Coupling
- The mechanical component connecting the motor shaft to the fan shaft.
- In a high-temperature oven application, this is often a flexible coupling (e.g., Lovejoy jaw type, tire type, or grid coupling) to absorb vibration and misalignment caused by thermal expansion.
Driving
- Usually means the fan is directly driven (shaft-mounted to motor) or belt-driven. Given "coupling" is mentioned, it's likely direct drive via a coupling.
Backward Curved Fan
- A type of centrifugal fan impeller where blades curve away from the rotation direction.
- Key traits:
- High efficiency
- Non-overloading power curve (safe for ducts with variable static pressure)
- Quieter than forward-curved fans
- Often used in industrial ovens, HVAC, and drying systems because they handle higher static pressure well.
High Volume
- The fan is designed to move large quantities of air (CFM/m³/h).
- Backward curved fans can achieve high volumes at moderate pressures.
Oven Wall Cooling Blower
- Application: Mounts on the exterior of an industrial oven wall.
- Purpose: Cools the oven's outer skin, electronics, or exhaust gases; or circulates hot air inside the oven for uniform heating.
- Material: The Q345 coupling and likely the fan housing are designed to withstand high radiant heat from the oven wall.
Xqi
- This is almost certainly a model number or series designation from a Chinese manufacturer (e.g., XQI-No.4.5A, XQI-6.3C).
- "XQ" often stands for "Xin Qi" (新起) or a similar brand.
- "I" might indicate a specific design revision (e.g., "Improved" or "Industrial").
What You Probably Have
You are referencing a direct-drive, backward-curved centrifugal fan made of Q345 steel, with a flexible coupling connecting it to the motor, designed as a wall-mounted cooling blower for a high-temperature industrial oven. The "Xqi" is the specific model identifier from the manufacturer.
Common Applications
- Bakery ovens
- Paint drying ovens
- Industrial furnaces
- Heat treatment equipment
Potential Concerns/Checkpoints
- Heat rating: Ensure the coupling and motor are rated for the ambient temperature near the oven wall (often requires a heat slinger or cooling fan on the motor).
- Balance: Backward curved fans must be dynamically balanced, especially at high RPMs.
- Sealing: The coupling area may need a heat shield or labyrinth seal to prevent hot oven air from traveling along the shaft to the motor.
If you need to source a replacement or specification:
- Look for the full model number on the fan nameplate (e.g., "XQI-6.3C" or "XQI-315").
- Check the motor power (kW), RPM, and the coupling size (bore diameter and keyway).
Would you like assistance in finding the exact specifications for an XQI fan, or troubleshooting an installation?
