CN207894883U - Gas concentration instrument - Google Patents

Abstract

The utility model provides gas concentration instrument, is placed in the front end of gas chromatograph, including sampling device, ten-way valve, six-way valve, capturing device, discharger, helium input pipe, cold focusing device；The capturing device is quantity tube；The sampling device further includes ten-way valve, autosampler and six sample input pipes, internal standard input pipe and nitrogen input pipe.Gas concentration instrument provided by the utility model is a instrument for being directly connected to gas chromatograph and doing high concentration chemical analysis, the volatile organic matter of high quality is provided for gas chromatograph.It is with sampling device, it can realize while there are 22 road sample intake passages, and wherein 16 paths realize automatic sampling, the Soviet Union's agate tank or airbag of complete series size can be connect, it is with cold focusing device, the temperature of its cold focusing can be controlled at 100 DEG C to 196 DEG C, can realize that sample focuses again under cryogenic so that volume of the sample before entering gas chromatograph is less than 1 microlitre.

Description

Gas concentration instrument

Technical field

The utility model is related to gas detection equipment technical fields, more particularly, to a kind of gas concentration instrument.

Background technology

In environmental monitoring and analysis technical field, the volatile organic matter in air or exhaust gas is Evaluation Environment quality Important indicator, volatile organic matter is monitored and analyzed be environmental monitoring emphasis, it is significant.It is existing to be directed to volatility There are cryotraps for the device for monitoring and analyzing of organic matter using electronic cooling technology, is unable to reach deep cooling (- 195 DEG C) and nothing Method traps low-boiling volatile organic matter, and the adsorbent in trap tube is quantitative, and absorption is easily saturated and needs various samples The monitoring effect of gas concentration instrument is poor caused by the problems such as carrying out needing manual operation sample introduction when sample introduction, manual operation error Greatly, data deviate that authenticity, the result error of data are big, linear and reproducibility is inconsistent.

Invention content

Utility model aims to solve the monitoring effect of existing gas concentration instrument is poor, manual operation error is big, number According to big, the linear and inconsistent reproducibility disadvantage of the result error for deviateing authenticity, data, a kind of gas concentration instrument is provided.

The utility model solve its technical problem the technical solution adopted is that：Gas concentration instrument, is placed in gas chromatograph Front end, including sampling device, six-way valve, capturing device, discharger, helium input pipe, cold focusing device；

The sampling device includes sample feeding pipe；

The capturing device is quantity tube, and the quantity tube is 1/16 inch of silanization pipe, has first port and the Two-port netwerk；

The discharger include four-way valve, the emptying discharge line being connect with the 18th interface of the four-way valve, with The efferent duct with vacuum pump of the 19th interface connection of the four-way valve；

The cold focusing device has the shell of freezing chamber, is equipped with sample input in the shell and sample exports End, the sample output end are connect with the gas chromatograph；

11st interface of the six-way valve is connect with the sample feeding pipe of the sampling device, the 12nd interface and the discharge 17th interface of the four-way valve of device connects, and the of the 13rd interface of the six-way valve and the quantity tube of the capturing device Single port connects, and the 16th interface of the six-way valve is connect with the second port of the quantity tube of the capturing device, and described six 14th interface of port valve is connect with the helium input pipe, the sample of cold focusing device described in the 15th interface of the six-way valve Product input terminal connects.

Further, the sampling device further includes ten-way valve, autosampler and six sample input pipes；Described ten The first interface of port valve is connect with the input pipe of the autosampler, and second interface, third interface, the 4th interface, the 8th connect Mouth, the 9th interface and the tenth interface are connect with six sample input pipes respectively, and the 7th interface is connect with the sample feeding pipe.

Further, the cold focusing device further includes the liquid nitrogen being placed in outside the shell, is provided on the shell Input port for inputting liquid nitrogen and the outlet for liquid nitrogen to be discharged are provided with for conveying sample in the freezing chamber One tube body and the second tube body for being heated to first tube body after freezing, first tube body are threaded through institute It states in the second tube body and bending is provided with deformation structure, be provided with insulation construction at the deformation structure, described first One end of tube body is connect with the sample input, and the other end is connect with the sample output end, the both ends of second tube body The air inlet for being useful for input heat gas is respectively formed between head and first tube body and for being discharged for heat gas Exhaust outlet.

Further, the cold focusing device further includes gas blow pipe, the air inlet of the gas blow pipe and second tube body Connection.

Specifically, first tube body is metal tube, and the second tube body is 1/8 inch of tetrafluoroethene pipe.

Specifically, the caliber of first tube body is less than the caliber of second tube body.

Further, the discharger further includes mass flowmenter, and the mass flowmenter is placed in the four-way valve Between 19th interface and the vacuum pump.

Specifically, the autosampler includes free switching device and provides depositing for sample for the free switching device Storage device, the free switching device include 16 port valves and dock the inlet channel in 16 port valve with output channel Switching device, the output channel are connected to the first interface of the ten-way valve.

Specifically, the sampling device further includes internal standard input pipe, and the 5th interface of the ten-way valve and the internal standard are defeated Enter pipe connection.

Specifically, the sampling device further includes nitrogen input pipe, and the 6th interface of the ten-way valve and the nitrogen are defeated Enter pipe connection.

The beneficial effects of the utility model are：Gas concentration instrument provided by the utility model is a can directly to connect The instrument that gas chromatograph does high concentration chemical analysis is connect, the volatile organic matter of high quality is provided for gas chromatograph, it is wide It is general to be applied to oil, chemistry, agriculture chemistry, biochemistry, medical and health, the fields such as food.Gas provided by the utility model 22 road sample intake passages can be realized while be had to body concentrating instrument, and wherein 16 paths are realized automatically with sampling device Sample introduction can connect the Soviet Union's agate tank or airbag of complete series size, with cold focusing device, the temperature of cold focusing can control- 100 DEG C Dao -196 DEG C, it can realize that sample focuses again under cryogenic so that sample is before entering gas chromatograph Volume is less than 1 microlitre.

Description of the drawings

Fig. 1 is the conduit line map for the gas concentration instrument that the utility model embodiment provides；

Fig. 2 is the dimensional structure diagram for the gas concentration instrument that the utility model embodiment provides；

Fig. 3 is the structural schematic diagram of the cold focusing device for the gas concentration instrument that the utility model embodiment provides；

Fig. 4 is the part of the free switching device of the autosampler for the gas concentration instrument that the utility model embodiment provides Sectional view；

In figure：100- gas concentration instrument

10- sampling device 11- sample feeding pipe 12- ten-way valves

The second interface of the first interface P2- ten-way valves of P1- ten-way valves

4th interface of the third interface P4- ten-way valves of P3- ten-way valves

6th interface of the 5th interface P6- ten-way valves of P5- ten-way valves

8th interface of the 7th interface P2- ten-way valves of P7- ten-way valves

Tenth interface of the 9th interface P10- ten-way valves of P9- ten-way valves

13- sample input pipe 14- internal standard input pipe 15- nitrogen input pipes

20- capturing device 21- quantity tube 22- first port 23- second ports

30- discharger 31- four-way valves 32- is vented discharge pipe

33- efferent duct 34- vacuum pump 35- mass flowmenters

18th interface of the 17th interface S2- four-way valves of S1- four-way valves

20th interface of the 19th interface S4- four-way valves of S3- four-way valves

The cold focusing device 41- shells 411- freezing chambers of 40-

412- main body 413- head cover 42- sample input 43- sample output ends

The input ports 44- liquid nitrogen 441- 442- delivery outlets

The gas outlets 45- the first tube body 46- the second tube body 461- air inlet 462-

47- deformation structure 48- gas blow pipe 493- temperature detectors

49- insulation construction 491- thermal insulation board 492- insulation covers

50- six-way valve 60- helium input pipe 70- gas chromatographs

12nd interface of the 11st interface G2- six-way valves of G1- six-way valves

14th interface of the 13rd interface G4- six-way valves of G3- six-way valves

16th interface of the 15th interface G6- six-way valves of G5- six-way valves

80- autosampler 81- switching device 83-16 port valves

82- storage device 821- storage rack 822- gas storage device 823- stainless steel tubes

831- toroidal shell 832- circle spool 833- inlet channel 834- output channels

84- stepper motor 85- driver 86- index dial 87- photoelectrical couplers

89- mainboards

Specific implementation mode

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.

Referring to Fig. 1-2, it is gas concentration instrument 100 provided by the utility model, is placed in the front end of gas chromatograph, including Sampling device 10, six-way valve 50, capturing device 20, discharger 30, helium input pipe 60, cold focusing device 40.This practicality is new The gas concentration instrument 100 that type is provided is a instrument for being directly connected to gas chromatograph 70 and doing high concentration chemical analysis.Its With sampling device 10, it is equipped with autosampler 80 in sampling device 10, may be implemented to automatically switch sample introduction access, it can be with The sample introduction operation of the different samples of 16 kinds of disposable setting, therefore add original six sample intake passages so that the utility model institute The gas concentration instrument 100 of offer can have 22 road sample intake passages simultaneously, can connect the Soviet Union's agate tank or airbag of complete series size.And Gas concentration instrument 100 also has cold focusing device 40, and the temperature of cold focusing, which can control, is up to -196 DEG C at -100 DEG C, Neng Goushi Existing sample focuses again under cryogenic so that volume of the sample before entering gas chromatograph is less than 1 microlitre.

Specifically, referring again to Fig. 1-2, sampling device 10 provided by the utility model includes sample feeding pipe 11；Further include Ten-way valve 12, autosampler 80 and six sample input pipes 13；The wherein first interface P1 and autosampler of ten-way valve 12 80 input pipe connection, the tenth interface P10 of the 8th the 9th interface P9 of interface P8 of second interface P2 third interface the 4th interface P4 of P3 It is connect respectively with six sample input pipes 13, the 7th interface P7 is connect with sample feeding pipe 11.

The sampling device 10 not only have 6 sample input pipes 14, also have internal standard input pipe 14, the 5th of ten-way valve 12 the Interface P5 is connect with internal standard input pipe 14.Internal standard is added in sampling device 10, effect is become to the system of gas concentration instrument 100 It is turned into compensation monitoring, internal standard is added and can obviously reduce error, without correcting data.

Meanwhile the sampling device 10 further includes nitrogen input pipe 15, the 6th interface P6 and the nitrogen input pipe of ten-way valve 12 15 connections.The nitrogen input pipe 15 can complete the purging purification system of all pipelines in gas concentration instrument 100, in pipeline Sample carryover purged.

Further, the sampling device 10 of gas concentration instrument 100 provided by the utility model also has autosampler 80, which can access 16 sample paths simultaneously, then be led to its 16 samples by automatic switching control equipment 81 Road is selected, and the sample path needed is selected to be connected with output channel 834, thus can the output sample of output channel 834 Finally enter in sample feeding pipe 11 from the first interface P1 of ten-way valve 12.

Then, it is the structure chart of autosampler 80 provided by the utility model referring to attached drawing 2 and Fig. 4.This automatically into Sample device 80 includes free switching device 81 and provides the storage device 82 of sample for free switching device 81, free switching device 81 Including 16 port valves 83 and the switching device for docking the inlet channel 833 in 16 port valves 83 with output channel 834, output is logical Road 834 is connected to the first interface P1 of ten-way valve 12.16 port valves 83 in the autosampler 80 include a toroidal shell 831 with And the round spool 832 that can be rotated relative to toroidal shell 831 in toroidal shell 831.Toroidal shell 831 is equipped with 16 A inlet channel 833 and 1 output channel 834, set that there are one rotatably, with inlet channel 833 be connected on round spool 832 Input port (not showing place in figure) and an output port being connected to output channel 834.16 port valve 83 is to pass through circle The relative rotation in toroidal shell 831 of shape spool 832, thus by input port and toroidal shell 831 on the circle spool 832 On inlet channel 833 dock, to which sample can be entered by inlet channel 833 in round spool 832, then from round spool Output channel 834 is connected at 832 output port, is exported from output channel 834.And by the rotation of round spool 832 Different inlet channels 833 is selected to realize the selection of the sample introduction access of autosampler 80.The autosampler 80 passes through switching Device 81 realizes the input port of round spool 832 and the docking for inlet channel 833 automatically controlled in 16 port valves 83.The switching Device 81 includes being fixedly connected with the stepper motor 84 that it can be driven to rotate with the round spool 832 of 16 port valves 83, being stepper motor The driver 85 of 84 power supplies and the mainboard 89 for controlling driver 85, mainboard 89 are electrically connected with gas concentration instrument 100.The switching For the mainboard 89 of device 81 by the control of gas concentration instrument 100, gas concentration instrument 100 sends out demand to autosampler 80, main Plate 89 controls driver 85 and powers for stepper motor 84, and stepper motor 84 drives round spool 832 to rotate, when round spool 832 Input port rotate at inlet channel 833, which connects with round spool 832, and sample enters round spool 832, then exported from output channel 834.Stepper motor 84 provided by the utility model is a kind of induction machine, its work Principle is to utilize electronic circuit, direct current is become time sharing power supply, multiphase timing control electric current is stepping electricity with this electric current Machine 84 is powered, and stepper motor 84 could work normally.Driver 85 is exactly for stepper motor time sharing power supply, multiphase timing control Device.Driver 85 must can be used by forming control systems such as bicyclic shaped pulse signal, power driving circuits.When driver 85 By the pulse signal of mainboard 89, it rotates a fixed angle by the direction of setting with regard to Driving Stepping Motor, passes through control Pulse number controls angular displacement, can also control pulse frequency to control the speed and acceleration of motor rotation, to reach To the purpose of speed governing.I.e. switching device 81 can control the rotary speed and acceleration and stepper motor 84 of stepper motor 84 Rotation angle, that is to say, that the switching device 81 controls the rotation of the round spool 832 in 16 port valves 83 by stepper motor 84 Angle, the rotary speed and acceleration of the circle spool 832.The switching device 81 further includes coaxial solid with round spool 832 Surely the index dial 86 connected and the photoelectrical coupler 87 for detecting 86 rotation angle of index dial being electrically connected with driver 85, point Scale 86 is equipped with 16 circumferentially equally distributed through-holes.On index dial 86 circumferentially on be uniformly distributed 16 through-holes, should Through-hole is one-to-one with 16 inlet channels 833 in 16 port valves 83.The switching device 81 passes through index dial 86 and photoelectricity Coupler 87 determines the rotation angle of round spool 832, when stepper motor 84 drives round spool 832 to rotate, drives simultaneously It is rotated with 832 co-axially fixed index dial 86 of round spool, when rotating to the through-hole on index dial 86, photoelectrical coupler 87 is sent out When penetrating the light at end and penetrating the through-hole of index dial 86, photoelectrical coupler 87, which receives signal and feeds back to driver 85, to stop operating, To have the function that 16 inlet channels 833 in 16 port valves 83 are accurately positioned.Autosampler provided by the utility model 80 storage device 82 includes storage rack 821 and 16 gas storage devices 822 in storage rack 821, gas storage Device 822 is connected to the inlet channel 833 of 16 port valves 83 by stainless steel tube 823.The gas storage device 823 be Soviet Union agate tank or Person's airbag.Gas storage device 823 can be complete series size (1L 3L 6L 15L) Soviet Union's agate tank or airbag.Revive agate tank or Airbag accesses the inlet channel 833 of 16 port valves 83 by stainless steel tube 823.

Further, gas concentration instrument 100 provided herein includes capturing device 20, which is fixed Buret 21, the silanization pipe that quantity tube 21 is 1/16 inch have first port 22 and second port 23.It is carried out by quantity tube 21 Sample amounts (the volume size of replaceable quantity tube 21,0.2L 0.5 1L 2L).The quantity tube 21 will be whole in sample The captures such as volatile organic compounds, water and carbon dioxide.Quantity tube 21 parses volatile organic compounds with room temperature and gathers to cold Coke installation 40 has different vapour pressures using volatile organic compounds and moisture during shifting, and moisture is stayed in quantitative In pipe 21, quantity tube 21 inputs nitrogen with nitrogen input pipe 15 on sampling device 10 and carries out purging purification by quantity tube 21 later Interior sample carryover purging.

Further, it includes four-way valve 31 and four that gas concentration instrument 100 provided herein, which includes discharger 30, The emptying discharge line 32 of 18th interface S2 connections of port valve 31, connect with the 19th interface S3 of four-way valve 31 have it is true The efferent duct 33 of sky pump 34；The discharger 30 further includes mass flowmenter 35, and mass flowmenter 35 is placed in the of four-way valve 31 Between 19 interface S3 and vacuum pump 34.There are the discharger 30 two discharge lines, an emptying discharge line 32 to be used for The sample that exhaust gas etc. in sample is not necessarily to monitoring is discharged from emptying discharge line 32, another output with vacuum pump 34 Pipe 33 detects whether volatile organic compounds, water and carbon dioxide etc. in quantity tube 21 capture by mass flowmenter 35 Completely, when mass flowmenter 35 reaches setting flow, sample introduction is closed, and to the sample trapped in quantity tube 21 be transferred to cold Cold focusing is carried out in focusing device 40.

Further, include cold focusing device for gas concentration instrument 100 provided herein referring to attached drawing 1 and attached drawing 3 40 shells 41 with freezing chamber 411 are equipped with sample input 42 and sample output end 43, sample output end 42 in shell 41 It is connect with gas chromatograph 70.Cold focusing device 40 is provided in gas concentration instrument 100 provided by the utility model, this is cold poly- Quantity tube 21 can be shifted the sample refocusing to come by coke installation 40 so that volume of the sample before entering gas chromatograph 70 Less than 1 microlitre.Cold focusing device 40 is made after thickening, carbon dioxide removal using the cold type of focusing before chromatographic column Further concentration focuses on capillary chromatography column cap to volatile organic compounds, is then rapidly heated and makes it into chromatographic column completion Chromatography.The cold focusing device 40 is interior from fixed by the first tube body 45 using input liquid nitrogen 44 is first passed through in freezing chamber 411 Buret 21 shifts the sample to come and is freezed, then again by inputting heat gas into the second tube body 46 after freezing Carrying out the rapid sample heated in the first tube body 45, such set-up mode makes full use of the feature that each ingredient properties are different in sample, In 70 analytic process of follow-up gas chromatograph, realize the image that can compose different peak shapes, and peak shape it is higher, it is sharp, point From it is complete, do not trail, figure is good-looking, improves the convenience of gas analysis and the accuracy of data.

Specifically, the cold focusing device 40 in gas concentration instrument 100 provided by the utility model further includes being placed in shell Liquid nitrogen 44 outside 41, in being provided with the input port 441 for inputting liquid nitrogen 44 and the discharge for liquid nitrogen 44 to be discharged on shell 41 Mouthfuls 442, the first tube body 45 for conveying sample is provided in freezing chamber 411 and for pair the first tube body after freezing 45 the second tube bodies 46 heated, the first tube body 45 is threaded through in the second tube body 46 and bending is provided with deformation structure 47, insulation construction 49 is provided at deformation structure 47, one end of the first tube body 45 is connect with sample input 42, the other end It is connect with sample output end 43, is respectively formed between the two ends of the second tube body 46 and the first tube body 45 and is useful for input heating gas The air inlet 461 of body and the exhaust outlet 462 for being discharged for heat gas.

Further, after cold focusing device 40 completes the sample being transferred out to quantity tube 21 cold focusing, by setting The gas blow pipe 48 set completes sample presentation.The gas blow pipe 48 is connected to the air inlet 462 of the second tube body 46.It will be cold poly- by gas blow pipe 48 Sample in first tube body 45 of coke installation 40, which is transferred in gas chromatograph 70, to be analyzed.

Setting in this way, sample to be analyzed utilize liquid nitrogen before the chromatographic column for entering gas chromatograph 70 44 effect can freeze the sample in the first tube body 45 in freezing chamber 411.And at the end of freezing, it is heated using outside Gas is inputted from air inlet 461, and is flowed out from exhaust outlet 462, and heat gas is while stream is by the second tube body 46, the Sample with volatile organic compounds gas quickly heating simultaneously in one tube body 45, and the sample in the first tube body 45 is turned It moves in chromatographic column, thus on the same time, using the characteristic of volatile organic compounds itself, fireballing organic compound Object gas just can compose peak shape figure earlier, and the organic compound to pull up lame will compose peak shape figure in glue evening, real at this time The image of different peak shapes can be composed by having showed, and peak shape is higher, sharp, separation is complete, does not trail, and figure is good-looking.In order to meet Testing requirement, needs the first tube body 45 and the setting of the second tube body 46 is longer, and is arranged for convenience, reduces the body of shell 41 Product, will pass through and be both provided with deformation structure 47 on the first tube body 45 and the second tube body 46, to make the first tube body 45 and second Tube body 46 not only meets testing requirement in the longitudinal direction, but also can also reduce the volume of shell 41, is easily installed, and reduces manufacture Cost.And the setting of insulation construction 49, so that when refrigerant is in cryogenic refrigeration sample, the balance of temperature can be kept.The guarantor Warm structure 49 include thermal insulation board 491 and insulation cover 492, insulation cover 492 lid close on thermal insulation board 491 and between be formed with heat preservation Chamber, deformation structure 47 are arranged in incubation cavity.To lead to the common insulation effect of the thermal insulation board 491 and insulation cover 492, it is ensured that The balance of temperature can be kept when liquid nitrogen cryogenic refrigeration.As shown in figure 3, when specific manufacture, which includes one end open Main body 412 and for cover close sealed opening head cover 413, head cover 413 is connect by connection structure with main body 412, and is freezed Chamber is then formed in main body 412, and the first tube body 45 and the second tube body 46 are pierced by from the bottom of main body 412.

In the present embodiment, when freezing, liquid nitrogen 44 is input in freezing chamber 411 by input port 441, then liquid nitrogen 44 After being expanded in freezing chamber 411, sprayed via delivery outlet 442, in this process, liquid nitrogen can be quickly by freezing chamber Temperature in 411 is refrigerated to set temperature.The liquid nitrogen is provided by external liquid nitrogen container.And due to temperature height in freezing chamber 411 Low control is controlled by liquid nitrogen flow size, thus in order to realize and can control the temperature in freezing chamber 411, just The temperature detector 493 for detecting cavity temperature is provided in freezing chamber 411, to by the temperature detector 493 come The temperature in freezing chamber 411 is measured, the temperature then detected via control software collecting temperature detector 493, then realize to system The control of cryogen uninterrupted.The temperature detector 493 is thermocouple.For the accurate temperature detected in freezing chamber 411 The temperature detector 493, is just located at exhaust outlet 462 by degree.

Preferably, in the utility model embodiment, deformation structure 47 is in " U-shape ".It is not only convenient for gas flowing, and The volume occupied by the first tube body 45 and the second tube body 46 can be effectively reduced.As another realization method of deformation structure 47, It is in " helical form " that also deformation structure 47, which can be arranged, can be end to end circuitous configuration, equally disclosure satisfy that use demand.

Preferably, in specific manufacture, the first tube body 45 is metal tube, and the second tube body 46 is 1/8 inch of tetrafluoro second Alkene pipe.The caliber of first tube body 45 is less than the caliber of the second tube body 46, so that it is guaranteed that can penetrate into the second tube body 13.

Further, gas concentration instrument 100 provided herein includes the 11st interface G1 and sample introduction of six-way valve 50 The sample feeding pipe 11 of device 10 connects, and the 12nd interface G2 is connect with the 17th interface S1 of the four-way valve 31 of discharger 30, and six 13rd interface G3 of port valve 50 is connect with the first port 22 of the quantity tube 21 of capturing device 20, and the 16th of six-way valve 50 the Interface G6 is connect with the second port 23 of the quantity tube 21 of capturing device 20, and the 14th interface G4 and helium of six-way valve 50 are defeated Enter the connection of pipe 60, the sample input 42 of the cold focusing device of the 15th interface G5 of six-way valve 50 40 connects.

In open state, the 11st interface G1 and the 16th interface G6 are connected the six-way valve 50, i.e., sample feeding pipe 11 with it is fixed The second port 23 of buret 21 is connected；12nd interface G2 and the 13rd interface G3 are connected, i.e. the four-way valve 31 of discharger 30 The first port 22 of the 17th interface S1 and quantity tube 21 connect；The 15th interface G5 of 14th interface G4 are connected, i.e. helium Input pipe 60 and the sample input 42 of cold focusing device 40 are connected.

Six-way valve 50 in off position when, the 11st interface G1 and the 12nd interface G2 are connected, i.e. sample feeding pipe 11 and four-way 17th interface S1 of valve 31 is connected；13rd interface G3 and the 14th interface G4 are connected, i.e. the first port 22 of quantity tube 21 It is connected with helium input pipe 60；15th interface G5 and the 16th interface G6 are connected, i.e. the sample input of cold focusing device 40 42 connect with the second port 23 of quantity tube 21.

The operation principle of gas concentration instrument provided by the utility model is：Pass through sampling device, capturing device, discharge dress Set, cold focusing device, six-way valve control gas flow path under various working conditions, to realize the concentration of volatile organic matter, And then the volatile organic matter of high quality is provided for gas chromatograph.

The workflow of gas concentration instrument provided by the utility model is as follows：

1, sample purge pipeline：Sample enters from autosampler 80 in 12, when each portion in gas concentration instrument 100 When part temperature reaches stable, sample enters from autosampler 80 in gas concentration instrument 100, sample according to the flow velocity set and Pipeline in time purge gas concentrating instrument 100.

2, internal standard sample introduction：At this point, six-way valve 50 is in open state, internal standard gas enters ten by internal standard input pipe 14 and leads to In valve 12, and six-way valve 50 is entered by sample feeding pipe 11, then entered in quantity tube 21 by six-way valve 50 and quantified, and is final It is exported from the efferent duct 33 with vacuum pump 34 of discharger 30.

3, sample feeding：Six-way valve 50 is opened, and sample to be detected can pass through the autosampler in sampling device 10 80 carry out automatic sampling, can also pass through sampling device 10 by the 13 artificial sample introduction of sample introduction input pipe of sampling device 10, sample The 7th interface P7 of ten-way valve 12 enter in sample feeding pipe 11, sample to be detected at this time passes through sample feeding pipe 11 and enters six-way valve 50 11st interface G1, sample is directly input into the 16th interface G6 in six-way valve 50), i.e., sample is entered by the 16th interface G6 The second port 23 of quantity tube 21, whole volatile organic compounds, water and carbon dioxide in sample etc. are by quantity tube 21 Capture, the other parts in sample enter the 13rd interface G3 of six-way valve 50 from the first port 22 of quantity tube 21, and from six 12nd interface G2 of port valve 50 is sent into the four-way valve 31 of discharger 30, and from 33 row of efferent duct with vacuum pump 34 Go out, mass flowmenter 35 monitors the delivery flow of efferent duct 33, when mass flowmenter 35, which reaches, sets flow, sample introduction knot at this time Beam, six-way valve are closed.

4, sample desorption：Six-way valve is closed, and inputs helium to six-way valve 50 in helium input pipe 60, and helium is from six-way valve 50 The 14th interface G4 enter the 13rd interface G3, i.e. helium is blown into from the first port 22 of quantity tube 21, at this time by quantity tube Whole volatile organic compounds, water and carbon dioxide of 21 trappings etc. are by helium from 23 row of second port of quantity tube 21 Go out, enters the 15th interface G5 into the 16th interface G6 of six-way valve 50, and from the 16th interface G6, i.e., by quantity tube 21 Whole volatile organic compounds, water and carbon dioxide etc. of trapping are transferred into cold focusing device 40.

5, the cold focusing of sample：Cold focusing device 40 is opened, and liquid nitrogen 44 enters the freezing chamber 411 of shell 41 from input port 441 It is interior, freezing chamber 411 is cooled down, cooling temperature is can be controlled between -100 DEG C to -180 DEG C, is trapped at this time by quantity tube 21 Sample is blown by nitrogen in the first tube body 45 of cold focusing device 40, and refocusing is carried out in the environment of deep cooling, is focused and is completed Afterwards, liquid nitrogen 44 is closed, heat gas is inputted from air inlet 461, at this time after 45 thickening of the first tube body, carbon dioxide removal Volatile organic compounds by the second tube body heat gas be desorbed, open gas blow pipe 48, nitrogen from gas blow pipe 48 enter The sample input 42 of first tube body 45, by the discharge out of first tube body 45 of the sample after refocusing, from the first tube body 45 Sample output end 43 enters gas chromatograph 70 and carries out chromatography.

6, purging purification：The inlet channel 831 of sample input pipe 13 on sampling device 10 and autosampler 80 at this time On do not take over He Suma tanks or airbag, nitrogen is then inputted in the nitrogen input pipe 15 on the ten-way valve 12 of sampling device 10, The nitrogen of input carries out purging purification to each interface on ten-way valve 12 and the inlet channel on autosampler 80, when six When port valve 50 is opened, nitrogen can be to carrying out purging purification, when six-way valve 50 is closed in quantity tube 21, and nitrogen can be to row The each pipeline gone out in device 30 carries out purging purification.

The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality All any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle Within the scope of shield.

Claims (10)

1. gas concentration instrument is placed in the front end of gas chromatograph, which is characterized in that including sampling device, six-way valve, trapping dress It sets, discharger, helium input pipe, cold focusing device；

The sampling device includes sample feeding pipe；

The capturing device is quantity tube, and the silanization pipe that the quantity tube is 1/16 inch has first port and second end Mouthful；

The discharger include four-way valve, the emptying discharge line being connect with the 18th interface of the four-way valve, with it is described The efferent duct with vacuum pump of the 19th interface connection of four-way valve；

The cold focusing device has the shell of freezing chamber, and sample input and sample output end, institute are equipped in the shell Sample output end is stated to connect with the gas chromatograph；

11st interface of the six-way valve is connect with the sample feeding pipe of the sampling device, the 12nd interface and the discharger Four-way valve the 17th interface connection, the first end of the 13rd interface of the six-way valve and the quantity tube of the capturing device Mouth connection, the 16th interface of the six-way valve are connect with the second port of the quantity tube of the capturing device, the six-way valve The 14th interface connect with the helium input pipe, the sample of cold focusing device described in the 15th interface of the six-way valve is defeated Enter end connection.

2. gas concentration instrument as described in claim 1, which is characterized in that the sampling device, further include ten-way valve, automatically into Sample device and six sample input pipes；

The first interface of the ten-way valve is connect with the input pipe of the autosampler, and second interface, third interface, the 4th connect Mouth, the 8th interface, the 9th interface and the tenth interface are connect with six sample input pipes respectively, the 7th interface and the sample introduction Pipe connects.

3. gas concentration instrument as described in claim 1, which is characterized in that the cold focusing device further includes being placed in the shell Outer liquid nitrogen, it is described cold in being provided with the input port for inputting liquid nitrogen and the outlet for liquid nitrogen to be discharged on the shell Freeze intracavitary and is provided with the first tube body for conveying sample and for being heated to first tube body after freezing Second tube body, first tube body is threaded through in second tube body and bending is provided with deformation structure, is located at the deformation Insulation construction is provided at structure, one end of first tube body is connect with the sample input, the other end and the sample Output end connects, and is respectively formed between the two ends of second tube body and first tube body and is useful for input heat gas Air inlet and exhaust outlet for being discharged for heat gas.

4. gas concentration instrument as claimed in claim 3, which is characterized in that the cold focusing device further includes gas blow pipe, described Gas blow pipe is connected to the air inlet of second tube body.

5. gas concentration instrument as claimed in claim 3, which is characterized in that first tube body is metal tube, and the second tube body is 1/8 inch of tetrafluoroethene pipe.

6. gas concentration instrument as claimed in claim 5, which is characterized in that the caliber of first tube body is less than described second and manages The caliber of body.

7. gas concentration instrument as described in claim 1, which is characterized in that the discharger further includes mass flowmenter, institute Mass flowmenter is stated to be placed between the 19th interface of the four-way valve and the vacuum pump.

8. gas concentration instrument as claimed in claim 2, which is characterized in that the autosampler include free switching device and The storage device of sample is provided for the free switching device, the free switching device includes 16 port valves and leads to described 16 The switching device that inlet channel in valve is docked with output channel, the output channel and the first interface of the ten-way valve connect It is logical.

9. gas concentration instrument as claimed in claim 2, which is characterized in that the sampling device further includes internal standard input pipe, institute The 5th interface for stating ten-way valve is connect with the internal standard input pipe.

10. gas concentration instrument as claimed in claim 2, which is characterized in that the sampling device further includes nitrogen input pipe, institute The 6th interface for stating ten-way valve is connect with the nitrogen input pipe.