发明授权
US08123496B2 Two-unit pump for liquid chromatograph with flow sensor arrangement
失效
液体色谱仪两单元泵,配有流量传感器
- 专利标题: Two-unit pump for liquid chromatograph with flow sensor arrangement
- 专利标题(中): 液体色谱仪两单元泵,配有流量传感器
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申请号: US12845487申请日: 2010-07-28
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公开(公告)号: US08123496B2公开(公告)日: 2012-02-28
- 发明人: Kimihiko Ishii , Kiyotoshi Mori , Masahito Ito , Hironori Kaji , Takefumi Yokokura
- 申请人: Kimihiko Ishii , Kiyotoshi Mori , Masahito Ito , Hironori Kaji , Takefumi Yokokura
- 申请人地址: JP Tokyo
- 专利权人: Hitachi High-Technologies Corporation
- 当前专利权人: Hitachi High-Technologies Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: McDermott Will & Emery LLP0
- 优先权: JP2005-303939 20051019
- 主分类号: F04B1/06
- IPC分类号: F04B1/06 ; F04B49/20 ; B01D15/10
摘要:
A pump device 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 is disposed at an outlet port of a second pump. A position detection sensor detects a point where a first pump is shifted from a suction mode to a discharge mode. Moreover, the flow rate sensor detects that there is no discharge from the pump, and that there is discharge from the pump alone. Accordingly, a controller sets a rotation speed of a motor to a speed double the previous speed (double the normal rotation speed). When the flow rate sensor detects an increase in the flow rate at the outlet port of the second pump, the controller returns the rotation speed of the motor to a normal rotation speed. The rotation speed of the motor is controlled by accurate flow rate detection by the flow rate sensor. Thus, occurrence of pulsation can be suppressed.
公开/授权文献
- US20100288027A1 PUMP FOR LIQUID CHROMATOGRAPH 公开/授权日:2010-11-18