Liquid rheostat for starting an electric motor with improved sill structure
AssigneeElectricite de France (Service National)
InventorMichel Bensadoun
Life of this patent
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Abstract
A variable level liquid rheostat having a tubular overflow member between a starting chamber and a tank for controlling the level of electrolyte in the starting chamber. The overflow member has a closed upper end inside the starting chamber and lateral discharge orifices and communicates with the electrolyte in the tank. The overflow member produces a siphoning effect when the electrolyte level in the starting chamber is substantially above the discharge orifices for causing a sudden drop of the level in the starting chamber until the electrolyte level in the starting chamber again reaches the discharge.
Claims13
A variable-level liquid rheostat for starting an electric motor, comprising a tank which contains electrolyte, a starting chamber which is arranged above said tank, electrodes arranged in the upper part of said starting chamber, connecting terminals adapted to link said electrodes with the excitation circuit of the motor to be started, a feed pipe fitted between said tank and said starting chamber for the introduction of electrolyte into said chamber, a discharge sill arranged in said starting chamber and adapted to limit, at least temporarily, the level of electrolyte therein, wherein said discharge sill is mounted adjustably in height in the starting chamber under the control of an actuating means available to the user, said discharge sill is formed by the conjuction of two mutually nested coaxial tubes which each contains a slot and of which at least one is mounted rotatably about the axis of the assembly under the control of the actuating means available to the user, and the slot of at least one of said tubes being generally oblique relative to said axis.
A variable level liquid rheostat for starting an electric motor, said rheostat comprising a tank containing an electrolyte, a starting chamber arranged above said tank, electrodes arranged in the upper part of said starting chamber, connecting terminals adapted to connect said electrodes to an excitation circuit of a motor to be started, a feed pipe communicating between said tank and said starting chamber for supplying electrolyte to said starting chamber, a tubular overflow member arranged between said starting chamber and said tank to control the level of electrolyte in said starting chamber, said overflow member having a closed upper end inside said starting chamber and lateral discharge orifice means, and communicating with electrolyte in said tank, said overflow member defining siphoning means operative in response to an electrolyte level in said starting chamber substantially above said lateral discharge orifice for causing a sudden drop in the electrolyte level in said starting chamber until the electrolyte level in the starting chamber again reaches said discharge orifice means.
Dependencies are inferred from the claim text.