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Scott C Mancl

Dennis J Mancl

HVLP (High Velocity Low Pressure) motor-driven fans and other types of fans, blowers and vacuums include one or more features for minimizing vibration and eliminating other causes of fan or motor failure. Examples of such features include a fan blade with a particularly short tail section, a fan wheel spacer with a counterbore in an axial face of the spacer, and a small boss or thin shim adjacent to a screw that clamps an assembly of stator laminations between two motor brackets. The tail section, being relatively short, resists bending during high speed rotation, thereby preventing vibration. The counterbore in the spacer provides the spacer with resilience for maintaining an axial clamping force even as part dimensions change due to thermal expansion. The boss or shim allows the screw to tightly clamp the stator laminations without cracking either of the motor brackets.

Motor-driven fan with an assembly for minimizing vibration and strain

HVLP (High Velocity Low Pressure) motor-driven fans and other types of fans, blowers and vacuums take advantage of different thermal and mechanical properties of dissimilar materials used in the motor-driven fans. The dissimilar materials include aluminum for a stacked arrangement of fan wheels and spacers, steel for a shaft that supports the fan wheels and spacers, and a polymeric adhesive. In some examples, the polymeric adhesive is trapped between the aluminum and steels parts. Compared to steel and aluminum, the adhesive has a relatively high coefficient of thermal expansion but relatively low strength such that thermal expansion of the adhesive exerts additional clamping pressure during startup and during high temperature operation. The additional clamping pressure reduces vibration and eliminates other causes of fan or motor failure.

Motor-driven fan with trapped adhesive for minimizing vibration

A paint sprayer includes a motor-driven multi-stage turbine for compressing air, which subsequently flows through a venturi in a paint gun to draw in paint or some other liquid from a canister. To prevent the high-pressure air from expelling lubricant from the motor's inboard bearing, a pressure responsive annular seal axially deflects and sealingly engages an axial face of the bearing. To avoid subjecting the seal and bearing to excess air pressure and temperature created by the turbine, a bypass bleed line diverts some air to atmosphere when the paint gun is closed.

Paint sprayer with bearing protection

A seal actuated by generally atmospheric pressure helps protect the motor bearing of a vacuum appliances, such as a dry air vacuum cleaner, a wet/dry vacuum cleaner, a water extractor (e.g., carpet cleaner), etc. The generally atmospheric air pressure on a motor side of the seal and a vacuum on an opposite turbine side of the seal urges the seal in an axial direction toward an impeller of the vacuum appliance and presses the seal firmly against an axially abutting sealing surface. Sliding sealing contact between a broad axial surface of the seal and the abutting sealing surface helps prolong the life of the seal and the bearing.

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Johnson City, TN, United States of America

Scott C Mancl