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Blower and fan units used in Machine Knife for Metal Working

Blower and fan units used in Machine Knife for Metal Working, blender, and conveyor tube drying can reduce drying time by an average of 50% compared with natural air drying. They are almost always a direct-drive design in order to minimize size and cost. However, an in-line electric heater must be added, and this ultimately raises both the cost and total power consumption. The final assembly still must be compact enough to mount on a portable cart to easily service multiple mixers, and this portability requirement limits the size and drying power of these forced-air dryers.

There are other performance issues and technical drawbacks that make blower and fan units problematic for many users. They must be connected to an in-line electric heater in order to introduce hot air into the tanks, blenders, and auger conveyors. The blowers tend to have high pressure at low airflows, but low pressures at high airflows. The fan designs have low pressures at all airflow ranges and this low pressure makes it impossible to overcome air pressure resistance through the heater and throughout the tank, blender, and conveying circuit without losing all of the benefits of high air volume.

The end result is low air volumes for both the blower and fan dryer units. This causes equally low rates of air exchange throughout the whole tank, blender, and conveyor system. The net effect of such low air volumes at high air temperatures in regard to the heaters is that air temperature spikes can occur in certain areas.

These become dry while other internal surfaces of the tank, blender, and conveyor system remain moist, thereby remaining at ambient temperature longer and not drying at the same rate. These temperature extremes can also cause damage to rubber glands and seals within the tank, blender, and conveyor circuit. Because electric heater elements have a typical surface temperature of 1200F, safety considerations increase if the electric heater coils or the heater controller has any type of malfunction.