Patent ID: 8328740

Claim:
A pressure-balancing watertight electric control device mounted in a SPA machine for controlling operation of said SPA machine, the pressure-balancing watertight electric control device comprising: a box, said box comprising an opening and at least one button hole cut through a bottom side thereof; at least one watertight button respectively installed in said at least one button hole of said box and extending to the outside of said box for operation by a user; an electric control unit mounted inside said box and electrically connected to said at least one watertight button and controllable by said at least one watertight button; a watertight panel fastened to said box to seal said opening of said box, said watertight panel comprising a protruding diaphragm movable inwards/outwards to regulate the internal holding space of said box subject to an external water pressure acted upon said protruding diaphragm; a locating frame fastened to said watertight panel and said box to hold down said watertight panel in said opening of said box and seal said box to prevent water entering said box, said locating frame having an opening that receives said protruding diaphragm of said watertight panel; and an eccentric motor mounted in said box and electrically connected to said electric control unit, wherein said protruding diaphragm has a bottom deformable portion connected to said watertight panel; and said box is mounted with at least one electric power connector in a watertight manner for the connection of said electric control unit electrically.