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    • 32. 发明申请
    • Pump for liquid chromatograph
    • 泵用于液相色谱
    • US20070084766A1
    • 2007-04-19
    • US11582455
    • 2006-10-18
    • Kimihiko IshiiKiyotoshi MoriMasahito ItoHironori KajiTakefumi Yokokura
    • Kimihiko IshiiKiyotoshi MoriMasahito ItoHironori KajiTakefumi Yokokura
    • B01D35/14
    • G01N30/32G01N30/34G01N2030/322G01N2030/326
    • A pump device is realized, which accurately detects a flow rate of a pump, performs real-time control of the flow rate, and thus can suppress a flow rate error caused by occurrence of pulsation. Control of a pump rotation speed by a pressure sensor has low responsiveness in a low pressure region, and a correlation between a pressure and a flow rate is incomplete in a high flow rate region. With this taken into consideration, a flow rate sensor 10 is disposed at an outlet port 9 of a second pump 4. A position detection sensor 14 detects a point where a first pump 3 is shifted from a suction mode to a discharge mode. Moreover, the flow rate sensor 10 detects that there is no discharge from the pump 3, and that there is discharge from the pump 4 alone. Accordingly, a controller 15 sets a rotation speed of a motor 12 to a speed double the previous speed (double the normal rotation speed). When the flow rate sensor 10 detects an increase in the flow rate at the outlet port 9 of the second pump 4, the controller 15 returns the rotation speed of the motor 12 to a normal rotation speed. The rotation speed of the motor 12 is controlled by accurate flow rate detection by the flow rate sensor 10. Thus, occurrence of pulsation can be suppressed.
    • 实现了能够精确地检测泵的流量的泵装置,实现流量的实时控制,能够抑制由脉动发生引起的流量误差。 通过压力传感器控制泵的转速在低压区域的响应性低,在高流量区域中压力与流量的相关性不完全。 考虑到这一点,流量传感器10设置在第二泵4的出口9处。位置检测传感器14检测第一泵3从吸入模式移动到放电模式的点。 此外,流量传感器10检测到没有来自泵3的排出,并且仅从泵4排出。 因此,控制器15将电动机12的转速设定为与先前速度(正常转速两倍)的速度。 当流量传感器10检测到第二泵4的出口9的流量增加时,控制器15将马达12的转速恢复到正常的转速。 通过流量传感器10的精确的流量检测来控制电动机12的转速。因此,可以抑制脉动的发生。
    • 33. 发明授权
    • Pump for liquid chromatography
    • 泵用于液相色谱
    • US07063785B2
    • 2006-06-20
    • US10902028
    • 2004-07-30
    • Kenji HirakuKunihiko TakaoHironori KajiMasahito Ito
    • Kenji HirakuKunihiko TakaoHironori KajiMasahito Ito
    • B01D15/08
    • F04B11/0058B01D15/14F04B11/0083F04B13/02F04B53/06F04B2205/09G01N2030/326
    • The invention provides a pump for liquid chromatography excellent in feeding liquid stably at an extremely low flow rate with high accuracy and in discharging bubbles at startup.At startup, a first plunger feeds solvent at a large flow rate to discharge bubbles in a pump and to fill the solvent into the pump in a short time and in a normal operation, the first plunger is stopped and the second plunger is pushed into a second pressure chamber at a low speed to feed the solvent at a low flow rate. When the second plunger reaches full stroke, the second plunger is pulled back at a high speed and at the same time the first plunger is pushed into a first pressure chamber in synchronization with the pullback of the second plunger to control the flow rate passing a discharge passage to a constant value at all times by a controller. Further, while the second plunger feeds the solvent, the first plunger is slightly pushed into the first pressure chamber to keep pressure in the first pressure chamber at pressure equal to or less than pressure in the second pressure chamber.
    • 本发明提供了一种液体色谱泵,其具有以极高的精度稳定地以极低的流量供给液体并在起动时排出气泡的液体色谱。 在启动时,第一柱塞以大流量供给溶剂以排出泵中的气泡并在短时间内和正常操作中将溶剂填充到泵中,使第一柱塞停止并将第二柱塞推入 第二压力室以低速进料以低流量进料溶剂。 当第二柱塞达到全行程时,第二柱塞被高速拉回,同时第一柱塞与第二柱塞的回退同步地被推入第一压力室,以控制通过排放的流量 任何时候都由控制器传递给恒定值。 此外,当第二柱塞进料溶剂时,第一柱塞稍微推入第一压力室,以将第一压力室中的压力保持在第二压力室中等于或小于压力的压力。