Adjustable-Angle Fan Blades — UTEK-DELE Axial Fan Range

Adjustable-angle blades carry a separate blade root that is clamped to the hub, so the pitch can be set when the fan is built and changed later if the duty point moves. That flexibility is what allows one hub family to serve several machine platforms: the same impeller can be trimmed for airflow in one application and for static pressure in another.

The adjustable range at UTEK-DELE runs from the 180-745 mm class up to 2200 mm. Medium duties use the Z hub family with the P, S, K and 7Z series, while large industrial units use the W hub family from 560 mm to 2200 mm. Blade material is selected from the working temperature and atmosphere, with PAG as the standard heavy-load option, PAGAS for conductive duties and ALU for high-temperature zones.

Model Range and Specifications

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Blade Materials and Temperature Range

Blade material is selected from the working temperature and from the atmosphere around the impeller:

The conductive PAGAS option is supplied for equipment working in explosive-risk atmospheres such as dust or gas. It addresses the working environment of the blade; machine-level certification remains the responsibility of the equipment builder.

Hub Options

Blades are supplied with matched hub sets. The hub carries the blade loads and sets the shaft interface, so it is selected together with the blade count:

Typical Applications

This series is normally specified for the following duties:

• High performance moving-air units

• Livestock ventilation and cooling towers

• Off-highway engine cooling and low-speed generator set dissipation

• HVAC, compressors and engine-driven equipment

Specification Support

When a fan is being specified or replaced, the following points are confirmed before a blade set is released. They are the same checks used for OEM programs and for retrofit projects.

• Duty point: airflow and static pressure required at the working speed, taken from the cooling pack or ventilation requirement

• Installation: available diameter, shroud clearance, mounting pattern and the shaft interface of the existing hub

• Environment: maximum air temperature, dust or gas atmosphere, and whether static discharge has to be avoided

• Drive: available power, belt or direct drive, and whether the fan has to reverse in service

• Service: blade weight for handling during maintenance and spare-part availability across the machine fleet

Blade count, profile and material are then matched to those conditions in a fixed order: material first, then blade count, then hub family, with diameter confirmed against the shroud. Working in that sequence keeps the mechanical interface stable when the duty requirement changes later in the project, and it is why the same blade family can often stay in production while the cooling pack is revised.

Quality Assurance and Dynamic Balancing

Blades and hubs are supplied as a matched set and balanced on a hand laser balancing machine before shipment, with the pitch setting recorded for the duty point. The adjustable blade-angle concept is covered by a granted Chinese utility model patent (CN 212250568 U) held by the company's manufacturing entity.

Customization and Series Overview

Blade count, blade profile, hub family and material can be customized for OEM programs, and existing fans can be reviewed when airflow, noise or durability has to be improved on a running machine. Where no pitch change is expected over the life of the machine, a fixed-angle blade gives the same airflow with fewer parts and a simpler service procedure.

Related ranges: W Series large industrial fans | P Series adjustable fans | S Series blades.

Adjustable-Angle Fan Blades — Products in This Family

The blade models below are produced in this blade family. Each product page covers the specifications, materials and replacement details; blade sets are quoted with the hub so the shaft interface is confirmed at the same time.