CN2388602Y

CN2388602Y - Continuous sample-feeding device for mass spectrographic detection in situ

Info

Publication number: CN2388602Y
Application number: CN 99242040
Authority: CN
Inventors: 张兵; 郭耘
Original assignee: Lanzhou Institute of Chemical Physics LICP of CAS
Current assignee: Lanzhou Institute of Chemical Physics LICP of CAS
Priority date: 1999-08-27
Filing date: 1999-08-27
Publication date: 2000-07-19
Anticipated expiration: 2009-08-27

Abstract

The utility model relates to a continuous sample feeding device for mass spectrographic detection in situ, which is composed of a sampling capillary, a tee switching joint, a steady flow valve, an effusion meter, a mechanical pump, an accurate leakage valve, etc. The tee switching joint is matched with the mechanical pump to form a W type equi-proportional sampling gas path; the steady flow valve, the effusion meter and the mechanical pump form a sampling adjusting device which is adjustable at any time, easy and convenient. The utility model is suitable for sampling on mass spectrometric detection gas in any reacting circuits (including operation with pressure) or volatile liquid sample, can be connected in any reacting sites in a flexible and convenient way, and can conveniently cooperate with chromatogram, infrared machines, etc. One device serves for a plurality of purposes.

Description

The continuous sample introduction device that is used for the mass spectrum in situ detection

The utility model relates to a kind of improvement that utilizes mass spectrum reaction to be carried out the continuous sample introduction device of online, real-time, in situ detection.

Utilize mass spectrum to analyze a plurality of components simultaneously, response is rapid, and the detection sensitivity height has obtained using widely at aspects such as environmental monitoring, medical and health, chemical product analyses.Under the present complete business-like situation of mass spectrometer production, the design of sample introduction has become raising sensitivity, shortens one of gordian technique of response time.It mainly solves sample by the conversion that just is pressed onto negative pressure, and itself and mass spectrum high vacuum system are complementary; The matching problem of sample size and mass spectrum working flow.The main mode that is used for the mass spectrum sample introduction at present has: direct guiding method, dividing potential drop shunting, concentration method etc.The design of these sample introductions and processing request strictness cost an arm and a leg, and specificity is strong, and great majority form all-in-one-piece structure by special purpose interface and necessary instrument, are unfavorable for moving easily and adjusting, and can not detect in real time many reactions.

The purpose of this utility model is to overcome the harsh requirement of direct guiding method to the mass spectrum vacuum system, or to importing the requirement of gas simplification; Overcome other introductory technique interface and cost an arm and a leg, specificity is strong, and special purpose interface and necessary instrument form all-in-one-piece structure, is unfavorable for the problem that moves and adjust easily.The continuous sample introduction device that is used for the mass spectrum in situ detection that provide a kind of highly versatile, simple in structure, easy to process, flexible operation, can adjust at any time.

The utility model is achieved by following measure:

The utility model is made up of sampling kapillary, stainless-steel tube, heating tape, heating tube fixture splice and fine leak valve etc., it is characterized in that sampling and connect by a threeway X-over between kapillary and the fine leak valve, should try one's best near the injection port of fine leak valve in the kapillary termination that connects, reduce the disperse dead space; The threeway other end is connected with flowmeter, flow stabilizing valve, mechanical pump successively.

Fig. 1 is a synoptic diagram of the present utility model: 1 is flow stabilizing valve (also available needle valve), the 2nd, and flowmeter, the 3rd, sampling kapillary, the 4th, stainless-steel tube, 5 heating tube fixture splices, 6 heating tapes, 7 threeway X-overs, 8 mechanical pumps, 9 fine leak valves.The pumping speed of the regulation device control mechanical pump of forming by flow stabilizing valve 1 and flowmeter 28 is regulated sampling quantity.Gas forms the equal proportion gas passage of a W type in the threeway X-over 7 at fine leak valve 9 injection port places, and at the lowermost end of W type path, gas detects by fine leak valve 9.

Fig. 2 is the partial enlarged drawing of threeway X-over.

Key of the present utility model is to utilize the threeway X-over to cooperate the equal proportion sampling gas circuit of the W type that forms with mechanical pump; The adjustable extract system of forming by flow stabilizing valve, flowmeter and mechanical pump of independence.

The utility model is applicable to any reaction circuit (comprising the band press operation) gas of Mass Spectrometer Method or the sampling of volatilizable fluid sample, can be at the reaction scene flexibly, connect easily, carry out real-time, online, in situ detection, and can be easily and chromatogram, online use such as infrared, a tractor serves several purposes.

Claims

1. continuous sample introduction device that is used for the mass spectrum in situ detection, form by sampling kapillary 3, stainless-steel tube 4, heating fixture splice 5, heating tape 6, fine leak valve 9 etc., it is characterized in that sampling connects by a threeway X-over 7 between kapillary 3 and the fine leak valve 9, and the other end of threeway is connected with flowmeter 2, flow stabilizing valve 1, mechanical pump 8 successively.