US 11,808,252 B2
Liquid delivery device and liquid chromatograph
Keisuke Ogawa, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/054,788
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed May 16, 2018, PCT No. PCT/JP2018/018916
§ 371(c)(1), (2) Date Nov. 12, 2020,
PCT Pub. No. WO2019/220563, PCT Pub. Date Nov. 21, 2019.
Prior Publication US 2021/0231621 A1, Jul. 29, 2021
Int. Cl. F04B 1/00 (2020.01); G01N 30/02 (2006.01); G01N 30/32 (2006.01); F04B 13/02 (2006.01); F04B 49/06 (2006.01); G01N 30/34 (2006.01)
CPC F04B 1/00 (2013.01) [F04B 13/02 (2013.01); F04B 49/065 (2013.01); G01N 30/02 (2013.01); G01N 30/32 (2013.01); G01N 2030/027 (2013.01); G01N 2030/326 (2013.01); G01N 2030/328 (2013.01); G01N 2030/347 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A liquid delivery device comprising:
a first liquid delivery pump and a second liquid delivery pump that perform liquid delivery operation independently of each other, each of the first liquid delivery pump and the second liquid delivery pump having a primary plunger pump and a secondary plunger pump driven independently of each other, the secondary plunger pump being connected in series downstream of the primary plunger pump;
a liquid delivery controller configured to operate, in a complementary manner, the primary plunger pump and the secondary plunger pump of each of the first liquid delivery pump and the second liquid delivery pump so that the first liquid delivery pump and the second liquid delivery pump perform continuous liquid delivery at preset flow rates for the respective liquid delivery pumps; and
a forcible synchronization part configured, after receiving input of a synchronization signal indicating that operation states of the first liquid delivery pump and the second liquid delivery pump are to be synchronized, to calculate, when the primary plunger pump of the first liquid delivery pump and the primary plunger pump of the second liquid delivery pump become in a predetermined state after completing suction operation, an operation speed of the primary plunger pump of the first liquid delivery pump, an operation speed of the secondary plunger pump of the first liquid delivery pump, an operation speed of the primary plunger pump of the second liquid delivery pump, and an operation speed of the secondary plunger pump of the second liquid delivery pump necessary for causing a plunger of the secondary plunger pump of the first liquid delivery pump and a plunger of the secondary plunger pump of the second liquid delivery pump to reach a bottom dead center at the same time without affecting a liquid delivery flow rate of each of the first liquid delivery pump and the second liquid delivery pump, and to forcibly synchronize operation states of the secondary plunger pump of the first liquid delivery pump and the secondary plunger pump of the second liquid delivery pump by operating the primary plunger pump of the first liquid delivery pump, the secondary plunger pump of the first liquid delivery pump, the primary plunger pump of the second liquid delivery pump, and the secondary plunger pump of the second liquid delivery pump at respective calculated operation speeds.