DUNLI / Zhejiang Dunli industrial fans and external rotor drives

Industrial fans and drives from DUNLI / Zhejiang Dunli deliver energy-efficient air movement for commercial chillers, AHU systems, and refrigeration.

EC high-pressure axial fans series EC180 and EC92

Industrial axial fans DUNLI (Zhejiang Dunli) series EC180 incorporate external rotor brushless drives with integrated electronic commutation. Units facilitate precise speed modulation through 0-10 V and PWM control interfaces across industrial chillers and telecom cabinets.

Modulated impeller speed control via external 0-10 V or pulse width modulation inputs
Integrated electronic inverter module with thermal protection and phase loss monitoring
High static pressure capability combined with low acoustic emission across working points
Dynamically balanced aluminum impeller protected with durable corrosion-resistant finish

AC external rotor axial fans series YWF for refrigeration

Axial fans DUNLI (Zhejiang Dunli) series YWF with external rotor asynchronous motors serve commercial refrigeration, evaporators, and air-cooled condensing units. Impeller diameters ranging from 250 to 800 mm generate concentrated airflow rates reaching 25000 cubic meters per hour.

Single-phase and three-phase motor options accommodating diverse power installations
Heavy-duty protective wire guard with polymer coating ensuring dependable operation
Standardized diameter range from 250 to 800 mm matching commercial heat exchangers
Internal thermal contacts wired into stator windings guarding against power surges

EC backward curved centrifugal fans for AHU and cleanrooms

Centrifugal motorized impellers DUNLI (Zhejiang Dunli) featuring backward curved blades operate inside air handling units, heat recovery systems, and cleanroom air recirculation. Compact motorized wheel geometry delivers direct propulsion eliminating efficiency losses from belt drives.

Aerodynamically optimized blade contour minimizing airflow turbulence and noise
High electrical efficiency under uninterrupted round-the-clock operating cycles
Stable pressure output overcoming resistance of high-efficiency particulate air filters
Flexible mounting orientations enabled by robust precision-machined flange framework

Forward curved centrifugal blowers single and dual inlet

Centrifugal blowers DUNLI (Zhejiang Dunli) engineered with forward curved blades handle substantial air volumes within compact scroll housings. Single and dual inlet modifications integrate into industrial air curtains, fan coil units, and specialized air distribution plenums.

Galvanized scroll housing with precision diffuser profile directing high-volume airflow
Dual-inlet architecture maximizing volumetric throughput in constrained compartments
Multi-vane drum impeller maintaining continuous laminar discharge without pulsation
Direct-drive external rotor motor integrated into impeller hub saving equipment depth

Inline duct fans for round and rectangular ventilation

Inline duct fans DUNLI (Zhejiang Dunli) install directly into round and rectangular ductwork layouts. Units feature external rotor drives and internal thermal protection, providing forced air renewal across industrial manufacturing bays, workshops, and testing laboratories.

Rigid galvanized steel casing with standardized duct connecting flanges for rapid setup
Direct integration into existing duct runs without demanding custom intermediate adapters
Removable service inspection panel facilitating impeller maintenance without dismantling
Low power demand under steady operation in general building ventilation networks

External rotor motors, impellers, and replacement assemblies

To assist scheduled maintenance and modernization of ventilation systems, DUNLI (Zhejiang Dunli) supplies replacement components: external rotor drives, stators, balanced impellers, bearing assemblies, and protective grilles restoring nominal performance parameters.

External rotor AC and EC motors dynamically balanced under stringent factory tolerances
Aluminum and reinforced polymer impellers verified through static and dynamic alignment
Heavy-duty rolling bearings packed with high-temperature long-life synthetic grease
Standardized mounting brackets, protective guards, and wall mounting wall plates

Engineering principles of external rotor EC brushless drives in DUNLI EC180 fans

Industrial axial fans DUNLI (Zhejiang Dunli) series EC180 utilize synchronous permanent magnet motor architecture with integral electronic commutation. Combining the external rotor envelope directly with the aluminum impeller hub eliminates mechanical drive belts and intermediate pulley losses.

The integrated microprocessor driver governs spatial magnetic stator orientation, delivering high torque across low rotational speeds.

External analog control voltages from zero to ten volts or pulse-width modulated inputs enable continuous speed modulation matched with demanding chiller cooling loads.

Aerodynamic behavior and thermal thresholds of YWF series AC fans in refrigeration units

Asynchronous fans DUNLI (Zhejiang Dunli) series YWF operate across commercial air coolers, remote fluid condensers, and liquid chillers. Impeller diameters spanning 250 to 800 mm are precision-stamped from corrosion-resistant aluminum sheet and balanced under dynamic factory protocols.

The aerodynamic blade contour suppresses flow separation along outer diffuser margins, reducing acoustic emission while maintaining large volumetric throughput.

Bimetallic thermal contacts embedded in stator windings trip power circuits automatically whenever winding temperatures approach class F limits.

Energy efficiency and pressure performance of EC backward curved motorized impellers

Centrifugal motorized impellers DUNLI (Zhejiang Dunli) featuring backward curved blades establish directional air pressure throughout air handling units, server room chillers, and industrial filtration arrays.

The aerodynamically shaped blade geometry preserves stable pressure generation as air system static resistance increases, safeguarding electric motors against overload when filter media accumulates particulate matter.

Adopting brushless direct current drives substantially lowers overall electrical power consumption compared to conventional asynchronous fan installations.

Design aspects of forward curved centrifugal blowers within compact air handlers

Centrifugal blower units DUNLI (Zhejiang Dunli) equipped with forward curved multi-blade drums deliver elevated airflow volumes against moderate static head.

The spiral enclosure is assembled from galvanized steel using continuous seam resistance welding, preventing localized air leaks along the outer scroll boundary.

Dual-inlet configurations develop uniform laminar air discharge without high-frequency pressure pulsations, allowing seamless integration into commercial air curtains, perimeter fan coils, and compact ventilation plenums.

Installation geometry and routine servicing of inline duct fans in ventilation networks

Inline duct fans DUNLI (Zhejiang Dunli) featuring round and rectangular connections fit directly between industrial ventilation ducts across workshops and laboratories.

Galvanized metal enclosures feature standardized flange interfaces, simplifying mechanical mounting without requiring custom intermediate transition adapters.

The service access panel permits convenient inspection of the motorized impeller and terminal box for dust clearing without disconnecting duct sections. Precision rolling bearings lubricated with synthetic grease support uninterrupted 24-7 operation.

Diagnostics, dynamic balancing, and bearing renewal for external rotor motor assemblies

Long-term operational dependability of DUNLI (Zhejiang Dunli) ventilation assemblies under heavy industrial duties relies on scheduled vibration monitoring and proactive component servicing.

When elevated vibration or atypical low-frequency hum develops along equipment housings, spectral vibration testing localizes bearing raceway deterioration or balancing clip detachment. Bearing renewal utilizes induction heaters to prevent shaft scoring.

Installing dynamically balanced impellers restores factory-grade balance levels and smooth operation.

DUNLI / Zhejiang Dunli and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of DUNLI / Zhejiang Dunli and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.