公开(公告)号：US3859006A

公开(公告)日：1975-01-07

申请号：US36845673

申请日：1973-06-08

Applicant: WEIR PUMPS LTD

Inventor： RANDELL FORREST THOMSON

IPC: G05D13/62 ,  F01D21/00 ,  F04B17/00 ,  F04B49/06 ,  F04D15/00 ,  G08B5/00 ,  F01B25/00

CPC classification number: F04D15/0066 ,  F04B17/00 ,  F04B49/065 ,  F04B2201/0801 ,  F04B2201/0802 ,  F04B2201/1212 ,  F04B2203/1101 ,  F04B2203/1103 ,  F04B2205/06 ,  F04B2207/044

Abstract: In a steam turbine driven pump installation, the steam flow to the turbine is controlled by a combined stop and throttle valve which includes a power operated actuator so as to vary the output of the pump, and a speed feed-back control is provided for the turbine comprising an indicator issuing a signal corresponding to the turbine speed, and a comparator comparing the speed signal with a desired value and delivering a control signal based on the comparison to a servo-device of the valve actuator for adjustment of the valve whereby turbine speed may be maintained constant. Additionally the installation includes an emergency control respondent to operating conditions in the installation e.g. turbine overspeed, oil pressure etc., the emergency control including a switch in the power supply to the valve actuator whereby in the event of the operating condition being unsatisfactory the switch is opened to close the steam valve.

Abstract translation: 在汽轮机驱动泵安装中，通过组合的止回阀和节流阀来控制到涡轮机的蒸汽流，该止回阀和节流阀包括一个动力操纵的致动器，以便改变泵的输出，并提供速度反馈控制 涡轮机，其包括发出对应于涡轮机速度的信号的指示器，以及将速度信号与期望值进行比较的比较器，并且基于与阀致动器的伺服装置的比较传递控制信号，以调节阀，从而涡轮速度 可以保持恒定。 此外，安装包括对安装中的操作条件的应急控制。 涡轮超速，油压等，应急控制包括向阀致动器供电的开关，由此在操作状态不令人满意的情况下，开关打开以关闭蒸汽阀。