General sample injector, gas chromatograph and combined spectrometer

Patent metadata

Field	Value
Publication number	US-9618484-B2
Application number	US-201414577603-A
Country	US
Kind code	B2
Filing date	Dec 19, 2014
Priority date	Dec 30, 2013
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

The present invention discloses a general sample injector, comprising a sample injection port mechanism, a sample injector shell, a vaporizing chamber, a heater, a temperature control unit, a carrier gas channel, a septum purge channel, a flow splitting channel, a coolant channel, a multichannel flow control valve and a temperature control unit. The general sample injector, equivalent to a “programmed temperature vaporizer” injector combining splitting/no splitting with cold column head sample injection, gives full play to the advantages of various sample injection modes, overcomes a plurality of disadvantages, and has higher practicability and better flexibility.

First claim

The invention claimed is:

1. A sample injector, comprising:
a sample injector shell;
a vaporizing chamber located in the sample injector shell;
a sample injector shell opening and a detachable end cover arranged at the top of the sample injector shell, the detachable end cover sealing the sample injector shell opening;
a vaporizing chamber opening arranged at the top of the vaporizing chamber, wherein a channel for enabling a gas to pass is reserved between the vaporizing chamber opening and the end cover;
a carrier gas channel, a septum purge channel and a coolant channel further arranged in the sample injector shell around an outer circumference of the vaporizing chamber, a carrier gas channel opening portion and a septum purge channel opening portion being respectively arranged at the tops of the carrier gas channel and the septum purge channel, and both the carrier gas channel opening portion and the septum purge channel opening portion being in communication with the vaporizing chamber opening;
wherein the carrier gas channel is provided with a carrier gas inlet, the septum purge channel is provided with a septum purge channel outlet, and the coolant channel is provided with a coolant inlet and a coolant outlet;
wherein the septum purge channel and the carrier gas channel are configured to flow the gas in opposite directions within the sample injector shell;
a capillary column arranged at the bottom of the vaporizing chamber, one end of the capillary column projecting into the vaporizing chamber, and the other end of the capillary column projecting out of the sample injector; and
one or more heaters further arranged in or on the sample injector shell.

2. The sample injector according to claim 1 , further comprising:
an inlet liner fixed in the vaporizing chamber, the two ends of the inlet liner being open, an opening at the top of the inlet liner being in communication with the vaporizing chamber opening, and an opening at the bottom of the inlet liner not being in contact with the bottom of the vaporizing chamber;
a gap for enabling the gas to pass reserved between an outer surface of the inlet liner and an inner surface of the vaporizing chamber; and
a ring-shaped sealing and fixing device arranged at an outer edge of the opening at the top of the inlet liner and at an inner edge of the vaporizing chamber opening;
wherein the inlet liner penetrates through the ring-shaped sealing and fixing device to fix the outer edge of the opening at the top of the inlet liner in the vaporizing chamber.

3. The sample injector according to claim 2 , wherein the ring-shaped sealing and fixing device is made from a high temperature resistant rubber material or a graphite material.

4. The sample injector according to claim 3 , further comprising: a flow splitting channel, the flow splitting channel comprising a flow splitting channel opening and a flow splitting channel outlet, and the flow splitting channel opening being arranged on the side wall of the vaporizing chamber and being in communication with the vaporizing chamber.

5. The sample injector according to claim 2 , further comprising: a flow splitting channel, the flow splitting channel comprising a flow splitting channel opening and a flow splitting channel outlet, and the flow splitting channel opening being arranged on the side wall of the vaporizing chamber and being in communication with the vaporizing chamber.

6. The sample injector according to claim 1 , further comprising: a flow splitting channel, the flow splitting channel comprising a flow splitting channel opening and a flow splitting channel outlet, and the flow splitting channel opening being arranged on a side wall of the vaporizing chamber and being in communication with the vaporizing chamber.

7. The sample injector according to claim 1 , wherein the coolant channel is in communication with the vaporizing chamber.

8. The sample injector according to claim 1 , further comprising: a sealing septum arranged between the sample injector shell opening and the detachable end cover, wherein a channel for enabling the gas to pass is reserved between the sealing septum and the vaporizing chamber opening.

9. The sample injector according to claim 1 , wherein the carrier gas inlet, the septum purge channel outlet, the coolant inlet and the coolant outlet are all arranged at the bottom of the sample injector shell.

10. The sample injector according to claim 9 , wherein the carrier gas inlet, the septum purge channel outlet, the coolant inlet and the coolant outlet are all connected to a gas flow control valve.

11. The sample injector according to claim 1 , wherein the carrier gas inlet, the septum purge channel outlet, the coolant inlet and the coolant outlet are all connected to a gas flow control valve.

12. The sample injector according to claim 1 , wherein the one or more heaters are uniformly distributed on an outer wall of the sample injector shell, and the one or more heaters are controlled by a temperature control unit to achieve single-point temperature heating or programmed temperature heating.

13. The sample injector according to claim 12 , wherein the carrier gas inlet, the septum purge channel outlet, the coolant inlet and the coolant outlet are all connected to a gas flow control valve, and the temperature control unit is further connected to the gas flow control valve;
wherein the temperature control unit and the gas flow control valve are configured to cooperate to cool the sample injector.

14. The sample injector according to claim 1 , wherein the sample injector shell is made from a metallic material, and the center of the detachable end cover and the center of the vaporizing chamber are coaxial.

15. The sample injector according to claim 1 , wherein the capillary column is arranged at a central position at the bottom of the vaporizing chamber.

16. A gas chromatograph, comprising the sample injector according to claim 1 .

17. A combined spectrometer, which is a gas chromatography-ion mobility spectrometer and comprises the sample injector according to claim 1 .

18. A combined spectrometer, which is a gas chromatography-mass spectrometer and comprises the sample injector according to claim 1 .

Assignees

• Nuctech Co Ltd

Inventors

• Zhang Qingjun
• Li Yuanjing
• Chen Zhiqiang
• Ma Qiufeng
• Zhao Ziran
• Liu Yinong
• Liu Yaohong
• Wang Junxiao
• Zou Xiang
• Wang Yanchun
• Chang Jianping
• Tan Linxia

Classifications

• G01N30/30

  of temperature · CPC title

• G01N2030/025

  Gas chromatography · CPC title

• G01N27/622

  Ion mobility spectrometry · CPC title

• G01N30/20

  using a sampling valve · CPC title

• G01N30/7206

  interfaced to gas chromatograph (interfaces in general for introducing or extracting samples to be analysed with specially adapted mass spectrometer, see H01J49/04) · CPC title