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US 5,172,754 AGranted
Heat exchanger for recovery of heat from a spa or hot tub pump motor
OwnerNeil M. Graber, Carol R. Puryearinventors
Life of this patent
Estimating the term…
Abstract
A heat exchanger coil for heating water in a spa or hot tub by transferring heat generated by an electric motor driving a pump to the water in the coil while the pump circulates the water through the spa or hot tub. A restrictor mounted on the shaft of the electric motor creates additional friction between its outer surface and the inner surface of the motor seal to further warm the water.
Claims9
An apparatus for recovery of waste heat from an electric motor driven pump having a wet end for recirculating water through a spa or hot tub comprising:
- a coil of tubing contacting the exterior surface of said motor and having opposite respective ends thereof connected to a discharge and a suction side of said pump;
- a motor seal sealing an armature shaft of said motor from pump fluid leakage and an annular restrictor separate from said motor seal being mounted to rotate with said motor shaft and sized to create additional friction between the outer surface of said restrictor and the inner surface of said motor seal thereby further heating the water recirculating between the spa or hot tub and the pump.
Dependencies are inferred from the claim text.