Multiple solvent delivery system
    2.
    发明授权
    Multiple solvent delivery system 失效
    多种溶剂输送系统

    公开(公告)号:US5360320A

    公开(公告)日:1994-11-01

    申请号:US843624

    申请日:1992-02-27

    CPC分类号: G01N30/34 G05D11/131

    摘要: To control a solvent composition in a supercritical fluid system, a first pump pumps a first solvent through a first conduit into a mixer and a second pump pumps a second solvent through a second conduit into the mixer. First and second transducers measure the pressure in the first and second conduits and generate first and second signals proportional to the pressures. Each pressure signal is multiplied by a corresponding programmed concentration signal and compared to the programmed pressure in a feedback system to generate an error signal. The error signal is multiplied by concentration signals from a programmer to control the pumping rate of each pump. The pumps pressurize each fluid one at a time at the start of a run. The pressurization process is also used for producing disturbance-free flow as delivery is changed from one pump to another during prolonged runs.

    摘要翻译: 为了控制超临界流体系统中的溶剂组成,第一泵将第一溶剂通过第一导管泵送到混合器中,并且第二泵将第二溶剂通过第二导管泵送到混合器中。 第一和第二换能器测量第一和第二导管中的压力并产生与压力成比例的第一和第二信号。 每个压力信号乘以相应的编程浓度信号,并与反馈系统中编程的压力进行比较,以产生误差信号。 误差信号乘以来自编程器的浓度信号,以控制每个泵的泵送速率。 泵在运行开始时一次加压每个流体。 加压过程也用于产生无扰动的流量,因为在长时间运行期间输送从一个泵改变到另一个泵。

    Gradient system
    6.
    发明授权
    Gradient system 失效
    渐变系统

    公开(公告)号:US4981597A

    公开(公告)日:1991-01-01

    申请号:US355881

    申请日:1989-05-19

    IPC分类号: G01N30/34

    CPC分类号: G01N30/34 G01N2030/347

    摘要: To supply a programmed gradient to a high pressure pump for introduction into a column, a mixer, degasser and accumulator communicates with the high pressure pump to supply fluid thereto, having a volume no more than 150 times the chamber volume of the high pressure pump. The mixer, degasser and accumulator includes temperature sensors which sense when the mixer, degasser and accumulator has been emptied to a level where it cannot respond to a demand for fluid from said high pressure pump and provides a signal to a low pressure pump which responds by cycling to again fill the mixer, degasser and accumulator. Upon receiving a demand signal, the low pressure pump fills by drawing fluid from a plurality of fluid sources to compose the gradient being used at that time, with the pump slowing during valve opening and closing so as to avoid cavitation.

    摘要翻译: 为了向高压泵提供编程梯度以引入塔中,混合器,脱气器和蓄能器与高压泵连通以向其提供流体,其体积不超过高压泵的室容积的150倍。 混合器,脱气机和蓄能器包括温度传感器,其感测混合器,脱气器和蓄能器何时被排空到不能响应来自所述高压泵的流体需求的水平,并且向低压泵提供信号,该低压泵由 循环再次填充混合器,脱气机和蓄压器。 在接收到需求信号时,通过从多个流体源抽取流体来填充低压泵以构成当时使用的梯度,同时在阀打开和关闭期间泵减慢,以避免空化。