Hydraulic elevator with an accumulator

B - Operations – Transporting – 66 – B

Patent

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Details

B66B 9/04 (2006.01)

Patent

CA 2419737

The invention relates to a hydraulic lift with an accumulator (16). According to the invention, a pump (13) is situated between the hydraulic drive (2) and the accumulator (16), this pump being driven by a motor (14) and providing a means for conveying hydraulic oil from the hydraulic drive (2) to the accumulator (16) and vice versa without the presence of control valves which influence the flow of hydraulic oil, such as proportionally pilot-operated valves. Since the pump (13) is subjected to the pressure PZ in the cylinder line (11) and the pressure PS in the accumulator line (15), the motor (14) of the pump (13) only has to work against the differential pressure and in certain operating states, can even function as a generator and release electrical energy through a power output device (23) controlling it. This reduces the energy requirements for operating the lift. The speed of the car (1) is controlled or regulated through the control of the motor (14) alone by a control and regulation device (25), through the power output device (23).

L'invention concerne un ascenseur hydraulique pourvu d'un accumulateur de pression (16). Selon l'invention, une pompe (13) entraînée par un moteur (14) est placée entre la commande hydraulique (2) et l'accumulateur de pression (16). Cette pompe permet l'acheminement d'huile hydraulique de la commande hydraulique (2) à l'accumulateur de pression (16) et inversement sans que soient nécessaires des soupapes de régulation influant sur l'écoulement d'huile hydraulique, par exemple des soupapes à pilotage proportionnel. Comme, d'une part, la pression P¿Z? dans la conduite de cylindre (11) et, d'autre part, la pression P¿S? dans la conduite d'accumulateur (15) agissent sur la pompe (13), le moteur (14) de la pompe (13) travaille uniquement contre la pression différentielle et peut même, dans des états de fonctionnement définis, agir en tant que générateur et fournir de l'énergie électrique par l'intermédiaire d'un régulateur de puissance (23) le pilotant. La consommation d'énergie nécessaire au fonctionnement de l'ascenseur est ainsi réduite. La vitesse de la cabine (1) est commandée ou régulée par un appareil de commande et de régulation (25) par l'intermédiaire du régulateur de puissance (23), uniquement grâce au pilotage du moteur (14).

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