Importance

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Abstract

An air supply system for spas provides protection against motor short circuits caused by water backflowing through the air supply line to the housing containing the motor and blower. A moisture-proof partition isolates the motor from direct exposure to the air supply line. The partition and the blower air intake tube are arranged to prevent water from reaching the motor, unless such water first flows through the outlet ports of the blower and then through the blower air intake tube. The blower ports dissipate the water backflow pressure, thereby preventing backflow surges of short duration from reaching the motor. In addition, the inlet end of the air intake tube extends vertically well above the bottom of the motor to provide a static head to offset the backflow pressure of water in the air intake tube. In an alternative embodiment, a drain is provided by ducting the air intake tube to the exterior of the housing to positively prevent water from reaching the motor.

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First Claim