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    • 8. 发明授权
    • Apparatus for improving the performance of a motor-controlled hydraulic
elevator
    • 用于提高电动液压电梯性能的装置
    • US5014823A
    • 1991-05-14
    • US400285
    • 1989-08-29
    • Raimo Pelto-Huikko
    • Raimo Pelto-Huikko
    • B66B1/26B66B1/24B66B9/04F15B21/14
    • F15B21/14B66B1/24B66B9/04
    • The invention concerns an apparatus for improving the performance of a motor-controlled hydraulic elevator, in which oil is pumped using an hydraulic pump controlled by an electric motor from a container via a main supply duct into a lifting cylinder to move the elevator upwards, and returned in a controlled manner through the pump into the container to move the elevator downwards. In order to improve the loading conditions of the motor during down-travel, the oil pressure in the main duct is reduced to a substantially predetermined constant level by means of a check valve or lowering valve which, to provide compensation for the pressure in the pump, has a feedback connection to the main duct via a pressure compensation valve which controls the volume of flow through the check valve or lowering valve.
    • 本发明涉及一种用于改善电动液压升降机的性能的装置,其中使用由电动机控制的液压泵通过主供应管道从容器泵送到提升缸中以将电梯向上移动,并且 以受控的方式通过泵返回到容器中以使电梯向下移动。 为了在下行期间改善电动机的负载状态,主管道中的油压通过止回阀或下降阀降低到基本上预定的恒定水平,以便为泵中的压力提供补偿 通过控制通过止回阀或下降阀的流量的压力补偿阀具有到主管道的反馈连接。