US 12,105,063 B2
Auto-sampler for chromatographs
Shotaro Ando, Kyoto (JP); Takashi Inoue, Kyoto (JP); and Kenichi Yasunaga, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/295,985
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Dec. 12, 2018, PCT No. PCT/JP2018/045642
§ 371(c)(1), (2) Date May 21, 2021,
PCT Pub. No. WO2020/121430, PCT Pub. Date Jun. 18, 2020.
Prior Publication US 2022/0026401 A1, Jan. 27, 2022
Int. Cl. G01N 30/24 (2006.01); G01N 30/18 (2006.01); G01N 30/20 (2006.01)
CPC G01N 30/24 (2013.01) [G01N 30/18 (2013.01); G01N 30/20 (2013.01); G01N 2030/185 (2013.01); G01N 2030/207 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An auto-sampler for chromatographs configured to inject sample into an analysis channel for chromatography, comprising:
a needle for sampling configured to move while a tip end thereof faces vertically downward;
an injection port provided as a member separate from a switching valve; and
a pipe that fluidically connects one port of the switching valve with the injection port;
wherein the injection port comprises:
an opening at an upper surface of the injection port, through which a tip end of the needle is inserted to make the needle fluidically communicate with the pipe,
a needle seal configured to get into contact with an outer circumferential surface of the tip end portion to make the needle fluidically communicate with the pipe in a liquid-tight manner when the tip end of the needle is inserted through the opening,
a housing having a recess that accommodates a broad member, fixed to an end portion of the pipe, with the broad member being fitted into the recess from above, and
a cap attached to the housing and having a through hole defining the opening;
wherein the pipe has an end surface close to the injection port facing vertically upward, and the end surface of the pipe appears on an upper surface of the broad member;
wherein the needle seal is disposed on the upper surface of the broad member that is fitted in the recess of the housing, and is pressed against the end surface of the pipe by the cap that is attached to the housing; and
wherein a slit is formed on a side wall of the housing of the injection port, extending from an outer side surface of the housing to an interior of the housing, allowing the pipe to pass through the side wall of the housing via the slit when the broad member is fitted into or is taken out of the recess.