CN214201316U

CN214201316U - Gas chromatography device based on six-way diaphragm valve autoinjection

Info

Publication number: CN214201316U
Application number: CN202023154438.5U
Authority: CN
Inventors: 冯飞; 赵斌
Original assignee: Shanghai Institute of Microsystem and Information Technology of CAS
Current assignee: Shanghai Institute of Microsystem and Information Technology of CAS
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-09-14
Anticipated expiration: 2030-12-24

Abstract

The utility model provides a gas chromatography device based on six-way diaphragm valve autoinjection, six-way diaphragm valve are based on high pressure carrier gas drive, the consumption is lower, and the miniature solenoid valve consumption that allies oneself with it is lower, thereby can reduce the consumption of gas chromatography device as a whole; the six-way diaphragm valve has small volume and light weight, and the micro electromagnetic valve used together with the six-way diaphragm valve has small volume and light weight, thereby integrally reducing the volume and the weight of the gas chromatography device and realizing the microminiaturization of the gas chromatography device; based on six functions such as automatic sweeping, sampling, appearance and detection that diaphragm valve and solenoid valve can realize the gas chromatography device, thereby the utility model discloses be favorable to realizing gas chromatography device's low-power consumption and microminiaturization to improve gas chromatography device's simple operation nature, enlarge gas chromatography device's range of application.

Description

Gas chromatography device based on six-way diaphragm valve autoinjection

Technical Field

The utility model belongs to the analytical chemistry field relates to a gas chromatography device based on six-way diaphragm valve autoinjection.

Background

The chromatography is a separation and detection technology for complex mixed components, and has wide application in the fields of petrochemical industry, exploration, environmental monitoring and the like. Gas chromatography refers to chromatography using a gas as the mobile phase. Due to the fast transport speed of the sample in the gas phase, the components of the sample can reach equilibrium between the mobile phase and the stationary phase instantaneously. In addition, the materials which can be selected as the stationary phase are more, so that the gas chromatography is a separation analysis method with high analysis speed and high separation efficiency. In recent years, a high-sensitivity selective detector is adopted, so that the method has the advantages of high analysis sensitivity, wide application range and the like.

The gas chromatograph is a chromatographic analysis device using gas as a mobile phase. The principle is mainly to realize the separation of the mixture by utilizing the differences of the boiling point, the polarity and the adsorption property of the substances. The sample to be analyzed is gasified in the gasifying chamber and carried into the chromatographic column with inert gas, liquid or solid fixed phase, and the components are separated in the column through repeated distribution and adsorption of the components in the sample under the flushing of the carrier gas.

Traditional gas chromatographs are powerful, can realize separation and detection to complicated material component, but traditional gas chromatographs power consumption is high, bulky, weight is heavy, generally can only use in the laboratory. With the development of society and economy and the rise of internet of things technology, more and more application occasions need to carry out real-time, on-site, quick and on-line detection on complex components, and the application occasions generally require that a gas chromatography device has an automatic sample introduction function and require that the whole device realizes low power consumption and microminiaturization. At present, the automatic sample introduction of the gas chromatography device generally adopts an electrically driven mechanical six-way valve, which has large volume, heavy weight and high power consumption and is not beneficial to realizing low power consumption and microminiaturization of the gas chromatography device.

Therefore, it is necessary to provide a gas chromatography device based on six-way diaphragm valve autoinjection.

SUMMERY OF THE UTILITY MODEL

In view of the above prior art's shortcoming, the utility model aims to provide a gas chromatography device based on six-way diaphragm valve autoinjection for solve prior art in the gas chromatography device, when adopting electrically driven mechanical six-way valve to carry out autoinjection, lead to that the gas chromatography device is bulky, weight is heavy, and the consumption is high, is unfavorable for the gas chromatography device to realize the problem of low-power consumption and microminiaturization.

In order to realize above-mentioned purpose and other relevant purposes, the utility model provides a gas chromatography device based on six-way diaphragm valve autoinjection, the gas chromatography device includes:

a six-way diaphragm valve including a flow port K1, a flow port K2, a flow port K3, a flow port K4, a flow port K5, a flow port K6, and a drive gas port K7;

a first two-way solenoid valve including a first two-way solenoid valve inlet and a first two-way solenoid valve outlet;

a second two-way solenoid valve comprising a second two-way solenoid valve inlet and a second two-way solenoid valve outlet;

the three-way electromagnetic valve comprises a first port of the three-way electromagnetic valve, a second port of the three-way electromagnetic valve and a third port of the three-way electromagnetic valve;

the first three-way joint comprises a first three-way joint first interface, a first three-way joint second interface and a first three-way joint third interface;

the second three-way joint comprises a second three-way joint first interface, a second three-way joint second interface and a second three-way joint third interface;

a sampler comprising a sampler inlet and a sampler outlet;

a chromatography column comprising a chromatography column inlet and a chromatography column outlet;

a detector comprising a detector inlet and a detector outlet;

the second interface of the second three-way joint and the flow path port K1 are carrier gas inlets, the first two-way electromagnetic valve inlets are sample gas inlets, and the flow path port K4 and the detector outlet are evacuation ports;

the first two-way electromagnetic valve outlet is connected with the first three-way joint interface, the third three-way joint interface is connected with the flow path port K5, the second three-way joint interface is connected with the second two-way electromagnetic valve outlet, the second two-way electromagnetic valve inlet is connected with the first three-way joint interface, the third three-way joint interface is connected with the first three-way electromagnetic valve port, the third three-way electromagnetic valve port is connected with the driving gas port K7, the sampler inlet is connected with the flow path port K6, the sampler outlet is connected with the flow path port K3, the flow path port K2 is connected with the chromatographic column inlet, and the chromatographic column outlet is connected with the detector inlet.

Optionally, the sampler comprises a dosing loop or an enricher.

Optionally, when the sampler employs the enricher, the gas chromatography apparatus further comprises:

a third two-way solenoid valve comprising a third two-way solenoid valve inlet and a third two-way solenoid valve outlet;

a fourth two-way solenoid valve comprising a fourth two-way solenoid valve inlet and a fourth two-way solenoid valve outlet;

wherein the third two-way solenoid valve inlet is connected to flow path port K6, the third two-way solenoid valve outlet is connected to the enricher inlet, the fourth two-way solenoid valve inlet is connected to the enricher outlet, and the fourth two-way solenoid valve outlet is connected to flow path port K3.

Optionally, the detector comprises one of a hydrogen Flame Ionization Detector (FID), a Photo Ionization Detector (PID), and a Helium Ionization Detector (HID).

Optionally, the gas chromatography apparatus comprises a dual column gas chromatography apparatus comprising:

a first chromatography column comprising a first chromatography column inlet and a first chromatography column outlet;

a second chromatography column comprising a second chromatography column inlet and a second chromatography column outlet;

a dual-path detector comprising a detector first inlet, a detector second inlet, a detector first outlet, and a detector second outlet;

the inlet of the second chromatographic column is a carrier gas inlet, and the first outlet of the detector and the second outlet of the detector are evacuation ports;

the first column inlet is connected to the flow path port K2, the first column outlet is connected to the detector first inlet, and the second column outlet is connected to the detector second inlet.

Optionally, the detector comprises a Thermal Conductivity Detector (TCD).

Optionally, the gas chromatography device further includes a micro pump and an electronic pressure controller connected to the micro pump, one end of the micro pump is connected to the flow path port K4, and the other end of the micro pump is connected to the electronic pressure controller.

Optionally, the gas chromatography device further includes one or a combination of a filter and an air resistor, wherein the filter is connected to the first two-way solenoid valve inlet, one end of the air resistor is connected to the first port of the first three-way joint, and the other end of the air resistor is connected to the second two-way solenoid valve inlet.

Optionally, the six-way diaphragm valve has a driving pressure range of 0.4MPa or more; the power consumption value of the electromagnetic valve is less than 1 watt; the size range of the electromagnetic valve is 1-10 cm; the weight range of the electromagnetic valve is 5 g-100 g.

As above, the utility model discloses a gas chromatography device based on six-way diaphragm valve autoinjection has following beneficial effect:

the six-way diaphragm valve is driven based on high-pressure carrier gas, so that the power consumption is low, and the power consumption of the miniature electromagnetic valve used together with the six-way diaphragm valve is low, so that the power consumption of the gas chromatography device can be integrally reduced; the six-way diaphragm valve has small volume and light weight, and the micro electromagnetic valve used together with the six-way diaphragm valve has small volume and light weight, thereby integrally reducing the volume and the weight of the gas chromatography device and realizing the microminiaturization of the gas chromatography device; based on six logical diaphragm valve and solenoid valve can realize that gas chromatography device's automation sweeps, samples, advances kind and function such as detection, thereby the utility model discloses a gas chromatography device based on six logical diaphragm valve autoinjectors is favorable to realizing low-power consumption and the microminiaturization of gas chromatography device to improve gas chromatography device's simple operation nature, enlarge gas chromatography device's range of application.

Drawings

Fig. 1 shows a schematic structural diagram of a single-column gas chromatography device based on six-way diaphragm valve auto-enrichment sampling in an embodiment of the present invention.

Fig. 2 shows a schematic structural diagram of a single-column gas chromatography device based on six-way diaphragm valve autoinjection in the second embodiment of the present invention.

Fig. 3 shows a schematic structural diagram of a dual-column gas chromatography device based on six-way diaphragm valve auto-enrichment sampling in the third embodiment of the present invention.

Fig. 4 shows a schematic structural diagram of a dual-column gas chromatography device based on six-way diaphragm valve autoinjection in the fourth embodiment of the present invention.

Description of the element reference numerals

110. 210, 310, 410 filter

120. 220, 320, 420 air lock

130. 330 enricher

230. 430 quantitative ring

140. 240, 340, 440 six-way diaphragm valve

150. 250, 350, 450 micropump

160. 260, 360, 460 electronic pressure controller

170. 270 column chromatography

371. 471 a first chromatographic column

372. 472 second chromatography column

180. 280 detector

380. 480 two-way detector

1901. 2901, 3901, 4901 first two-way solenoid valve

1902. 2902, 3902, 4902 second two-way solenoid valve

1903. 3903 third two-way solenoid valve

1904. 3904 fourth two-way solenoid valve

111. 211, 311, 411 three-way electromagnetic valve

1121. 2121, 3121, 4121 first three-way joint

1122. 2122, 3122, 4122 second three-way joint

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

As in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the device structure are not partially enlarged in general scale for convenience of illustration, and the schematic views are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "upper," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Further, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. As used herein, "between … …" is meant to include both endpoints.

In the context of this application, a structure described as having a first feature "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed in between the first and second features, such that the first and second features may not be in direct contact.

It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.

The gas chromatography apparatus in this embodiment is an improvement based on an existing automatic gas chromatography apparatus, and therefore, reference may be made to the existing gas chromatography apparatus as to a control system, a circuit connection system, a display system, and the like of the gas chromatography apparatus.

The embodiment provides a gas chromatography device based on six-way diaphragm valve autoinjection, gas chromatography device includes:

the three-way electromagnetic valve comprises a first port of the three-way electromagnetic valve, a second port of the three-way electromagnetic valve and a third port of the three-way electromagnetic valve; when the three-way electromagnetic valve is closed, the second port of the three-way electromagnetic valve is communicated with the third port of the three-way electromagnetic valve; when the three-way electromagnetic valve is opened, the first port of the three-way electromagnetic valve is communicated with the third port of the three-way electromagnetic valve;

a sampler comprising a sampler inlet and a sampler outlet;

a detector comprising a detector inlet and a detector outlet;

The six-way diaphragm valve is driven based on high-pressure carrier gas, the power consumption is low, and the power consumption of the electromagnetic valve used together with the six-way diaphragm valve is low, so that the power consumption of the gas chromatography device can be integrally reduced; the six-way diaphragm valve has small volume and light weight, and the electromagnetic valve used together with the six-way diaphragm valve has small volume and light weight, thereby integrally reducing the volume and the weight of the gas chromatography device and realizing the microminiaturization of the gas chromatography device; based on six-way diaphragm valve and solenoid valve can realize functions such as gas chromatography device's automatic purge, sampling, appearance and detection to the gas chromatography device based on six-way diaphragm valve autoinjection of this embodiment is favorable to realizing low-power consumption and the microminiaturization of gas chromatography device, with the simple operation that improves gas chromatography device, enlarges gas chromatography device's range of application.

By way of example, the sampler may include, but is not limited to, a dosing ring or an enricher.

As an example, when the sampler employs the enricher, the gas chromatography apparatus further comprises:

By way of example, the detector may include one of a hydrogen Flame Ionization Detector (FID), a Photo Ionization Detector (PID), and a Helium Ionization Detector (HID), but is not limited thereto.

As an example, the gas chromatography apparatus may comprise a dual column gas chromatography apparatus, wherein the dual column gas chromatography apparatus comprises:

By way of example, the detector in the dual column gas chromatography device may include, but is not limited to, a Thermal Conductivity Detector (TCD).

As an example, the gas chromatography apparatus further includes a micro pump and an Electronic Pressure Controller (EPC) connected to the micro pump, and one end of the micro pump is connected to the flow path port K4, and the other end of the micro pump is connected to the electronic pressure controller. So as to provide pressure for the gas through the micro pump, wherein the micro pump may be a pump with a small volume and weight, and the specific type is not limited herein. The electronic pressure controller is located behind the micro pump and plays a role in stabilizing the pumping speed of the micro pump, and the type of the electronic pressure controller is not limited herein.

As an example, the gas chromatography apparatus further includes one or a combination of a filter and a gas resistor, wherein the filter is connected to the first two-way solenoid valve inlet, one end of the gas resistor is connected to the first three-way connector first interface, and the other end of the gas resistor is connected to the second two-way solenoid valve inlet. The filter primarily functions to filter moisture or other matter, the air lock primarily functions to limit the purge flow rate, and the type of filter and air lock may be selected as desired and is not overly limited herein.

As an example, the six-way diaphragm valve has a drive pressure range of 0.4MPa or more; the power consumption value of the electromagnetic valve is less than 1 watt; the size range of the electromagnetic valve is 1-10 cm; the weight range of the electromagnetic valve is 5-100 g.

Specifically, the six-way diaphragm valve is switched under the drive of high-pressure carrier gas, preferably, the drive pressure range of the six-way diaphragm valve is greater than or equal to 0.4MPa, such as 0.4MPa, 0.5MPa, 1MPa, 2MPa and the like, so as to switch the flow path of the six-way diaphragm valve, for example, when the drive air port K7 of the six-way diaphragm valve is communicated with the atmosphere, the flow port K1 and the flow port K2 of the six-way diaphragm valve are communicated, the flow port K3 and the flow port K4 are communicated, and the flow port K5 and the flow port K6 are communicated; when the high-pressure carrier gas is communicated with the driving gas port K7 of the six-way diaphragm valve, the six-way diaphragm valve is switched under the driving of the high-pressure carrier gas, and at the moment, the flow path port K1 and the flow path port K6 of the six-way diaphragm valve are communicated, the flow path port K2 and the flow path port K3 are communicated, and the flow path port K5 and the flow path port K4 are communicated, so that the flow path of the six-way diaphragm valve can be switched under the driving of the high-pressure carrier gas. The specific type of six-way diaphragm valve is not overly limited herein. The solenoid valve may be a miniature solenoid valve, so as to further provide the solenoid valve with low power consumption, small volume and light weight, wherein the power consumption value of the solenoid valve may be less than 1 watt, such as 0.2 watt, 0.5 watt, 0.8 watt, and the like, but is not limited thereto; the size range of the electromagnetic valve can be 1 cm-10 cm, such as 1 cm, 5 cm, 8 cm, 10 cm and the like, but is not limited thereto; the weight of the solenoid valve may range from 5 grams to 100 grams, such as 5 grams, 10 grams, 20 grams, 50 grams, 100 grams, and the like, but is not limited thereto.

As an example, the quantification ring, the concentrator, the chromatography column and the detector may be a quantification ring, a concentrator, a chromatography column and a detector prepared based on a conventional process, or a quantification ring, a concentrator, a chromatography column and a detector chip prepared based on a Micro Electro Mechanical System (MEMS) technology.

The embodiment also provides a detection method of the gas chromatography device, which comprises the following steps:

providing any one of the above gas chromatography apparatuses, starting the gas chromatography apparatus, and performing the following operations:

purging: closing the first two-way solenoid valve and the three-way solenoid valve, opening the second two-way solenoid valve, wherein the driving air port K7 of the six-way diaphragm valve is communicated with the atmosphere, the flow path port K1 is communicated with the flow path port K2, the flow path port K3 is communicated with the flow path port K4, and the flow path port K5 is communicated with the flow path port K6; the first three-way joint first interface, the second two-way electromagnetic valve, the first three-way joint second interface, the first three-way joint third interface, the flow path port K5, the flow path port K6, the sampler, the flow path port K3 and the flow path port K4 are communicated to form a first purging path; the flow path port K1, the flow path port K2, the chromatographic column and the detector are communicated to form a second purging path; a first carrier gas completes the purging of the sampler through the first purging path; a second carrier gas completes the purging of the chromatographic column and the detector through the second purging path;

sampling: closing the second two-way electromagnetic valve and the three-way electromagnetic valve, opening the first two-way electromagnetic valve, and communicating the first two-way electromagnetic valve, the first three-way joint first port, the first three-way joint third port, the flow path port K5, the flow path port K6, the sampler, the flow path port K3 and the flow path port K4 to form a sampling path; the sampling path is used for filling the sampler with sample gas to finish sampling;

sample introduction: closing the first two-way solenoid valve and the second two-way solenoid valve, opening the three-way solenoid valve, communicating the driving air port K7 with the third interface of the second three-way joint through the three-way solenoid valve, switching the six-way diaphragm valve, communicating the flow port K1 with the flow port K6, communicating the flow port K2 with the flow port K3, and communicating the flow port K4 with the flow port K5; the flow path port K1, the flow path port K6, the sampler, the flow path port K3, the flow path port K2, the chromatographic column and the detector are communicated to form a sample introduction path; the second carrier gas sends the sample gas in the sampler into the chromatographic column through the sample injection path to complete sample injection;

and (3) detection: closing the first two-way electromagnetic valve and the three-way electromagnetic valve, opening the second two-way electromagnetic valve, and switching the six-way diaphragm valve to recover to the state during purging; the first carrier gas finishes the purging of the sampler through the first purging path, and the second carrier gas pushes the sample gas in the sample introduction process to continuously flow through the chromatographic column through the second purging path, so that the component separation is realized, the sample gas sequentially flows through the detector, and the detection of the sample gas is finished.

As an example, when the sampler employs an enricher, the sampling comprises the steps of:

refrigerating: closing the first two-way solenoid valve, the second two-way solenoid valve, the third two-way solenoid valve, the fourth two-way solenoid valve and the three-way solenoid valve, and refrigerating the enricher;

enrichment: closing the second two-way solenoid valve and the three-way solenoid valve, opening the first two-way solenoid valve, the third two-way solenoid valve and the fourth two-way solenoid valve, wherein the first two-way solenoid valve, the first three-way joint first port, the first three-way joint third port, the flow path port K5, the flow path port K6, the third two-way solenoid valve, the enricher, the fourth two-way solenoid valve, the flow path port K3 and the flow path port K4 are communicated to form an enrichment path; sample gas completes adsorption in the enricher via the enrichment pathway;

and (3) analysis: closing the first two-way solenoid valve, the second two-way solenoid valve, the third two-way solenoid valve, the fourth two-way solenoid valve and the three-way solenoid valve, and heating the enricher to complete desorption.

By way of example, but not limitation, the temperature of the concentrator during refrigeration is preferably less than or equal to 20 ℃, such as-5 ℃, 10 ℃, 15 ℃, etc. The temperature of the enriching device during desorption is preferably more than or equal to 250 ℃, such as 250 ℃, 300 ℃, 400 ℃, 500 ℃ and the like, but not limited to the temperature; the temperature of the enrichment device during enrichment is the same as the temperature of the enrichment device during refrigeration, and the temperature of the enrichment device during sample injection is the same as the temperature of the enrichment device during analysis.

As an example, when the gas chromatography apparatus is a dual column gas chromatography apparatus, the detecting comprises the following paths:

detecting a path: the flow path port K2 and the first chromatographic column communicate with the first detector inlet to form a detection path; the sample gas is subjected to separation detection through the detection path;

reference path: the second chromatographic column is communicated with the second inlet of the detector to form a detection path; a carrier gas provides a reference gas to the detector via the detection path.

The gas chromatography device based on six-way diaphragm valve autoinjection of the present invention is further described below with reference to specific embodiments and accompanying drawings.

Example one

As shown in fig. 1, this embodiment provides a single-column gas chromatography apparatus based on six-way diaphragm valve auto-enrichment sample injection, the gas chromatography apparatus includes: the system comprises a filter 110, a gas barrier 120, an enricher 130, a six-way diaphragm valve 140, a micro-pump 150, an electronic pressure controller 160, a chromatographic column 170, a detector 180, a first two-way solenoid valve 1901, a second two-way solenoid valve 1902, a third two-way solenoid valve 1903, a fourth two-way solenoid valve 1904, a three-way solenoid valve 111, a first three-way joint 1121, and a second three-way joint 1122. The concentrator 130, the chromatographic column 170 and the detector 180 can be prepared by conventional processes, or can be prepared by micro-electro-mechanical systems (MEMS) technology.

Referring to fig. 1, the detector 180 may be a hydrogen Flame Ion Detector (FID), a Photo Ionization Detector (PID), a Helium Ionization Detector (HID), but the type of the detector 180 is not limited thereto. In this embodiment, the detector 180 has only one flow path, and thus only one of the columns 170 is required to be connected thereto. The third two-way solenoid valve 1903, the enricher 130 and the fourth two-way solenoid valve 1904 are connected to serve as the sampler, and the micro pump 150 is adopted to provide power for the gas in this embodiment. Further, the electronic pressure controller 160 connected to the micro pump 150 may be further included to stabilize the pumping speed of the micro pump by the electronic pressure controller 160. The gas chromatography apparatus may further include the filter 110 and the gas barrier 120, so that the filter 110 mainly filters water vapor or other substances, and the gas barrier 120 mainly limits the purge flow rate, and the types of the filter 110 and the gas barrier 120 may be selected according to the needs without being limited excessively. In this embodiment, the electromagnetic valves are all micro electromagnetic valves, but not limited thereto, and the types and models of the micro electromagnetic valves can be selected according to the needs, which is not limited herein.

Specifically, the six-way diaphragm valve 140 includes a flow port K1, a flow port K2, a flow port K3, a flow port K4, a flow port K5, a flow port K6, and a drive gas port K7; the first two-way solenoid 1901 includes a first two-way solenoid inlet and a first two-way solenoid outlet; the second two-way solenoid valve 1902 includes a second two-way solenoid valve inlet and a second two-way solenoid valve outlet; the third two-way solenoid valve 1903 comprises a third two-way solenoid valve inlet and a third two-way solenoid valve outlet; the fourth two-way solenoid valve 1904 comprises a fourth two-way solenoid valve inlet and a fourth two-way solenoid valve outlet; the three-way electromagnetic valve 111 comprises a first port of the three-way electromagnetic valve, a second port of the three-way electromagnetic valve and a third port of the three-way electromagnetic valve; the first three-way joint 1121 includes a first three-way joint first interface, a first three-way joint second interface, and a first three-way joint third interface; the second three-way joint 1122 comprises a second three-way joint first interface, a second three-way joint second interface, and a second three-way joint third interface; the enricher 130 comprises an enricher inlet and an enricher outlet; the chromatographic column 170 comprises a chromatographic column inlet and a chromatographic column outlet; the detector 180 includes a detector inlet and a detector outlet; the micro pump 150 comprises a micro pump inlet and a micro pump outlet; the filter 110 comprises a filter inlet and a filter outlet, and the air resistor 120 comprises an air resistor inlet and an air resistor outlet; the electronic pressure controller 160 includes an electronic pressure controller inlet and an electronic pressure controller outlet.

The second port of the second three-way joint is a carrier gas inlet C1, the flow path port K1 is a carrier gas inlet C2, the filter inlet is a sample gas inlet S, the outlet of the electronic pressure controller is an evacuation port O1, the outlet of the detector is an evacuation port O2, and the second port of the three-way electromagnetic valve is communicated with the atmosphere.

The filter outlet is connected with the first two-way solenoid valve inlet, the first two-way solenoid valve outlet is connected with the first three-way joint first interface, the first three-way joint third interface is connected with the flow path port K5, the first three-way joint second interface is connected with the second two-way solenoid valve outlet, the second two-way solenoid valve inlet is connected with the air resistance outlet, the air resistance inlet is connected with the second three-way joint first interface, the second three-way joint third interface is connected with the three-way solenoid valve first port, the three-way solenoid valve third port is connected with the driving air port K7, the third two-way solenoid valve inlet is connected with the flow path port K6, the third two-way solenoid valve outlet is connected with the enricher inlet, and the fourth two-way solenoid valve inlet is connected with the enricher outlet, the outlet of the fourth two-way solenoid valve is connected to the flow path port K3, the flow path port K2 is connected to the inlet of the chromatography column, and the outlet of the chromatography column is connected to the inlet of the detector.

When the single-column gas chromatography device based on the six-way diaphragm valve automatic enrichment sample introduction is adopted for detection, the gas chromatography device is firstly started, and then the main working process is as follows:

purging: the first two-way solenoid valve 1901 and the three-way solenoid valve are closed, the second two-way solenoid valve 1902, the third two-way solenoid valve 1903, and the fourth two-way solenoid valve 1904 are opened, and the micro pump 150 and the electronic pressure controller 160 are opened. The drive air port K7 of the six-way diaphragm valve 140 communicates with the atmosphere, the flow path port K1 and the flow path port K2 communicate with each other, the flow path port K3 and the flow path port K4 communicate with each other, and the flow path port K5 and the flow path port K6 communicate with each other. The second three-way joint first interface, the air resistor 120, the second two-way solenoid valve 1902, the first three-way joint second interface, the first three-way joint third interface, the flow path port K5, the flow path port K6, the third two-way solenoid valve 1903, the enricher 130, the fourth two-way solenoid valve 1904, the flow path port K3, the flow path port K4, the micro pump 150 and the electronic pressure controller 160 are communicated to form a first purging path, and the flow path port K1, the flow path port K2, the chromatographic column 170 and the detector 180 are communicated to form a second purging path. The first carrier gas passes through the first purge path through the carrier gas inlet C1, and finally flows out of the evacuation port O1, and purging of the enricher 130 is completed, in this process, the enricher 130 is maintained at a high temperature of not less than 250 ℃, and the specific temperature can be set as required. A second carrier gas flows through the second purge path via the carrier gas inlet C2, and finally flows out of the evacuation port O2, thereby completing purging of the chromatography column 170 and the detector 180.

Refrigerating: the first two-way solenoid valve 1901, the second two-way solenoid valve 1902, the third two-way solenoid valve 1903, the fourth two-way solenoid valve 1904, and the three-way solenoid valve are closed, the micro pump 150 is closed, and the electronic pressure controller 160 is turned on. Refrigerating the enricher 130, reducing the temperature of the enricher 130 to 20 ℃ or below 20 ℃, and stabilizing at a proper temperature, wherein the specific temperature is set as required to prepare for the next enrichment sampling. The first carrier gas via the carrier gas inlet C1 is turned off and the second carrier gas is still purged along the second purge path by the carrier gas inlet C2.

Enrichment: the second two-way solenoid valve 1902 and the three-way solenoid valve are closed, and the first two-way solenoid valve 1901, the third two-way solenoid valve 1903, the fourth two-way solenoid valve 1904, the micro pump 150, and the electronic pressure controller 160 are opened. The filter 110, the first two-way solenoid valve 1901, the first three-way joint first port, the first three-way joint third port, the flow path port K5, the flow path port K6, the third two-way solenoid valve 1903, the enricher 130, the fourth two-way solenoid valve 1904, the flow path port K3, the flow path port K4, the micro pump 150 and the electronic pressure controller 160 are communicated to form an enrichment path; the sample gas finally flows out through the evacuation port O1 via the enrichment path, and the sample gas is adsorbed in the enricher 130 to complete enrichment, in which the enricher 130 maintains a low temperature set in the refrigeration process. The first carrier gas via the carrier gas inlet C1 is still turned off and the second carrier gas is still purged along the second purge path by the carrier gas inlet C2.

And (3) analysis: the first two-way solenoid valve 1901, the second two-way solenoid valve 1902, the third two-way solenoid valve 1903, the fourth two-way solenoid valve 1904, the three-way solenoid valve and the micro-pump 150 are closed, the electronic pressure controller 160 is turned on, and the enricher 130 is heated to complete desorption. Wherein the temperature for heating the enricher 130 is not less than 250 ℃, and is stabilized at a suitable temperature, and the specific temperature is set as required, so that the sample gas enriched at low temperature will be desorbed at high temperature. The first carrier gas via the carrier gas inlet C1 is still turned off and the second carrier gas is still purged along the second purge path by the carrier gas inlet C2.

Sample introduction: the first two-way solenoid valve 1901 and the second two-way solenoid valve 1902 are closed, the third two-way solenoid valve 1903 and the fourth two-way solenoid valve 1904 are opened, the three-way solenoid valve is opened, the micro pump 150 is closed, and the electronic pressure controller 160 is opened. The six-way diaphragm valve 140 is switched under the drive of high-pressure carrier gas, the drive gas port K7 is communicated with the third interface of the second three-way joint through the three-way electromagnetic valve 111, the pressure range is greater than or equal to 0.4MPa under the high-pressure action of the first carrier gas, the six-way diaphragm valve 140 is switched, the flow path port K1 is communicated with the flow path port K6, the flow path port K2 is communicated with the flow path port K3, and the flow path port K4 is communicated with the flow path port K5. At this time, the first carrier gas via the carrier gas inlet C1 is still cut off, and the second carrier gas sends the sample gas in the enricher 130 into the chromatographic column 170 to complete sample injection through a sample injection path formed by the communication of the flow path port K1, the flow path port K6, the third two-way solenoid valve 1903, the enricher 130, the fourth two-way solenoid valve 1904, the flow path port K3, the flow path port K2, the chromatographic column 170 and the detector 180. The temperature of the enricher 130 is maintained the same as the temperature during desorption.

And (3) detection: the first two-way solenoid valve 1901 and the three-way solenoid valve are closed, the second two-way solenoid valve 1902, the third two-way solenoid valve 1903, and the fourth two-way solenoid valve 1904 are opened, and the micro pump 250 and the electronic pressure controller 260 are opened. The six-way diaphragm valve 140 switches back to the purge condition due to the release pressure. The first carrier gas completes purging of the enricher 130 through the first purging path, the temperature of the enricher 130 is maintained at a high temperature of not less than 250 ℃ in the process, the specific temperature is set according to needs, and the temperature of the enricher 130 is the same as that in the analytic process. Meanwhile, the second carrier gas completes purging of the chromatographic column 170 and the detector 180 along the second purging path through the carrier gas inlet C2, pushes the sample gas in the sample injection process to continuously flow through the chromatographic column 170, realizes component separation and sequentially flows through the detector 180, and finally flows out from the evacuation port O2, thereby completing detection of the sample gas.

Since the purge is completed during the test step, if the test is continued, the second test may start directly from the cooling step.

Example two

Referring to fig. 2, the present embodiment provides a single column gas chromatography device based on six-way diaphragm valve autoinjection, which is different from the first embodiment mainly in that: in this embodiment, the enricher 130 of embodiment one is replaced with a dosing ring 230 and the third two-way solenoid valve 1903 and the fourth two-way solenoid valve 1904 are eliminated. The gas chromatography apparatus of the present embodiment includes: a filter 210, a gas block 220, a dosing ring 230, a six-way diaphragm valve 240, a micro-pump 250, an electronic pressure controller 260, a chromatography column 270, a detector 280, a first two-way solenoid valve 2901, a second two-way solenoid valve 2902, a three-way solenoid valve 211, a first three-way connector 2121, and a second three-way connector 2122. For specific connection, reference may be made to the first embodiment, which is not described herein. The quantitative ring 230, the chromatographic column 270 and the detector 280 may be prepared based on conventional techniques, or may be prepared based on micro-electro-mechanical systems (MEMS) technology.

When the single-column gas chromatography device based on the six-way diaphragm valve automatic sample injection is adopted for detection, the gas chromatography device is firstly started, and then the main working process is as follows:

purging: the first two-way solenoid valve 2901 and the three-way solenoid valve are closed, the second two-way solenoid valve 2902 is opened, and the micro pump 250 and the electronic pressure controller 260 are opened. The drive air port K7 of the six-way diaphragm valve 240 communicates with the atmosphere, the flow path port K1 and the flow path port K2 communicate with each other, the flow path port K3 and the flow path port K4 communicate with each other, and the flow path port K5 and the flow path port K6 communicate with each other. The second three-way joint first interface, the air lock 220, the second two-way solenoid valve 2902, the first three-way joint second interface, the first three-way joint third interface, the flow path port K5, the flow path port K6, the dosing ring 230, the flow path port K3, the flow path port K4, the micro pump 250 and the electronic pressure controller 260 are communicated to form a first purging path, and the flow path port K1, the flow path port K2, the chromatographic column 270 and the detector 280 are communicated to form a second purging path. The first carrier gas passes through the first purge path via the carrier gas inlet C1, and finally flows out of the evacuation port O1, thereby completing purging of the dosing ring 230. A second carrier gas flows through the carrier gas inlet C2, a second purging path, and finally flows out of the evacuation port O2, thereby completing purging of the chromatographic column 270 and the detector 280.

Sampling: the second two-way solenoid valve 2902 and the three-way solenoid valve are closed, the first two-way solenoid valve 2901 is opened, and the micro pump 250 and the electronic pressure controller 260 are opened. The filter 210, the first two-way solenoid valve 2901, the first three-way joint first port, the first three-way joint third port, the flow path port K5, the flow path port K6, the dosing ring 230, the flow path port K3, the flow path port K4, the micro pump 250 and the electronic pressure controller 260 are communicated with each other to form a sampling path; the sample gas fills the dosing ring 230 via the sampling path to complete the sampling. At this point, the first carrier gas via the carrier gas inlet C1 is still turned off and the second carrier gas is still being purged along the second purge path by the carrier gas inlet C2.

Sample introduction: the first two-way solenoid valve 2901 and the second two-way solenoid valve 2902 are closed, the three-way solenoid valve is opened, the micro pump 250 is closed, and the electronic pressure controller 260 is opened. At this time, the first carrier gas via the carrier gas inlet C1 is still turned off. The six-way diaphragm valve 240 is switched, and the flow path port K1 and the flow path port K6 communicate with each other, the flow path port K2 and the flow path port K3 communicate with each other, and the flow path port K4 and the flow path port K5 communicate with each other. The flow path port K1, the flow path port K6, the quantitative ring 230, the flow path port K3, the flow path port K2, the chromatographic column 270 and the detector 280 are communicated to form a sample feeding path; the second carrier gas feeds the sample gas in the quantification ring 230 into the chromatography column 270 for sample injection along the sample injection path via the carrier gas inlet C2.

And (3) detection: the first two-way solenoid valve 2901 and the three-way solenoid valve are closed, the second two-way solenoid valve 1902 is opened, and the micro pump 250 and the electronic pressure controller 260 are opened. The six-way diaphragm valve 240 switches back to the purge condition due to the release air pressure. The first carrier gas completes purging of the dosing ring 230 through the first purge path by the carrier gas inlet C1. Meanwhile, the second carrier gas completes purging of the chromatographic column 270 and the sampler 280 through the second purging path, pushes the sample gas in the sample injection process to continuously flow through the chromatographic column 270, realizes component separation, sequentially flows through the detector 280, and finally flows out of the evacuation port O2, thereby completing detection of the sample gas.

Since the purging is completed at the detection step, the second test may start directly from the sampling step if the tests are continued.

EXAMPLE III

Referring to fig. 3, the present embodiment provides a dual-column gas chromatography apparatus based on six-way diaphragm valve auto-enrichment sample injection, wherein the related detector adopts a dual-path detector 380, and the dual-column gas chromatography apparatus includes: the device comprises a filter 310, a gas resistor 320, an enricher 330, a six-way diaphragm valve 340, a micro pump 350, an electronic pressure controller 360, a first chromatographic column 371, a second chromatographic column 372, a two-way detector 380, a first two-way electromagnetic valve 3901, a second two-way electromagnetic valve 3902, a third two-way electromagnetic valve 3903, a fourth two-way electromagnetic valve 3904, a three-way electromagnetic valve 311, a first three-way joint 3121, and a second three-way joint 3122. The concentrator 330, the first chromatographic column 371, the second chromatographic column 372 and the two-way detector 380 can be prepared based on a traditional process, or can be prepared based on a Micro Electro Mechanical System (MEMS) technology.

Referring to FIG. 3, the dual path detector 380 is a Thermal Conductivity Detector (TCD), but not limited to such, the dual path detector 380 has two flow paths, which require two columns, the first column 371 and the second column 372, to be connected to: wherein the first chromatography column 371 comprises a first chromatography column inlet and a first chromatography column outlet; the second chromatography column 372 comprises a second chromatography column inlet and a second chromatography column outlet; the two-way detector 380 comprises a first detector inlet, a second detector inlet, a first detector outlet, and a second detector outlet; the inlet of the second chromatographic column is a carrier gas inlet C3, the first outlet of the detector is an evacuation port O2, and the second outlet of the detector is an evacuation port O3; the first column inlet is connected to the flow path port K2, the first column outlet is connected to the detector first inlet, and the second column outlet is connected to the detector second inlet. For other specific connections, reference may be made to the first embodiment, which is not described herein.

Wherein, the sample gas is separated when flowing through the first chromatographic column 371 under the driving of the carrier gas, and flows through the dual-path detector 380 to be detected, and flows out from the first outlet of the detector of the dual-path detector 380, i.e. the evacuation port O2, and this flow path is called a detection path; a second chromatographic column inlet of the second chromatographic column 372 is directly connected with a carrier gas as the carrier gas inlet C3, a second chromatographic column outlet of the second chromatographic column 372 is connected with a second detector inlet of the two-way detector 380, the carrier gas flows through the second chromatographic column 372 from the carrier gas inlet C3, enters another flow path of the two-way detector 380, and flows out from an evacuation port O3 of the two-way detector 380, and this flow path provides a reference gas for the detector, which is called a reference path.

When the double-column gas chromatography device based on six-way diaphragm valve automatic enrichment sample introduction is adopted for detection, the gas chromatography device is firstly started, and then the main working process is as follows:

purging: closing the first two-way solenoid valve 3901 and the three-way solenoid valve, opening the second two-way solenoid valve 3902, the third two-way solenoid valve 3903, the fourth two-way solenoid valve 3904, opening the micro-pump 350, and the electronic pressure controller 360. The drive air port K7 of the six-way diaphragm valve 340 communicates with the atmosphere, the flow path port K1 and the flow path port K2 communicate with each other, the flow path port K3 and the flow path port K4 communicate with each other, and the flow path port K5 and the flow path port K6 communicate with each other. The first interface of second three way connection, air lock 320, second two solenoid valve 3902, first three way connection second interface, first three way connection third interface, flow path port K5, flow path port K6, third two solenoid valve 3903, enricher 330, fourth two solenoid valve 3904, flow path port K3, flow path port K4, micropump 350, electronic pressure controller 360 are linked together, form first purge path, flow path port K1, flow path port K2, first chromatographic column 371 and double-circuit detector 380 are linked together, form the second purge path, double-circuit second chromatographic column 372 and detector 380 are linked together. The first carrier gas passes through the first purge path via the carrier gas inlet C1, and finally flows out of the evacuation port O1, and the purge of the enricher 330 is completed, in this process, the enricher 330 is maintained at a high temperature of not less than 250 ℃, and the specific temperature can be set as required. The second carrier gas passes through the second purging path via the carrier gas inlet C2, and finally flows out from the evacuation port O2, so as to complete purging of one flow path of the first chromatographic column 371 and the dual-path detector 380, the third carrier gas flows through the second chromatographic column 372 from the carrier gas inlet C3, enters the other flow path of the dual-path detector 380, and flows out from the evacuation port O3, and at this time, the carrier gas passes through both flow paths of the dual-path detector 380, and no signal is output.

Refrigerating: and closing the first two-way electromagnetic valve 3901, the second two-way electromagnetic valve 3902, the third two-way electromagnetic valve 3903, the fourth two-way electromagnetic valve 3904, and the three-way electromagnetic valve, closing the micro pump 350, and opening the electronic pressure controller 360. Refrigerating the enricher 330, reducing the temperature of the enricher 330 to 20 ℃ or below 20 ℃, and stabilizing at a suitable temperature, wherein the specific temperature is set as required to prepare for the next enrichment sampling. The first carrier gas is cut off through the carrier gas inlet C1, the two-way detector 380 still flows the two-way carrier gas from the carrier gas inlet C2 and the carrier gas inlet C3, and the two-way detector 380 has no signal output as the state in the purging process.

Enrichment: the second two-way solenoid valve 3902 and the three-way solenoid valve are closed, and the first two-way solenoid valve 3901, the third two-way solenoid valve 3903, the fourth two-way solenoid valve 3904, the micro pump 350, and the electronic pressure controller 360 are opened. The filter 310, the first two-way solenoid valve 3901, the first three-way joint first port, the first three-way joint third port, the flow path port K5, the flow path port K6, the third two-way solenoid valve 3903, the enricher 330, the fourth two-way solenoid valve 3904, the flow path port K3, the flow path port K4, the micro pump 350 and the electronic pressure controller 360 are communicated to form an enrichment path; the sample gas finally flows out through the evacuation port O1 via the enrichment path, and the sample gas is adsorbed in the enricher 330 to complete enrichment, in which the enricher 330 maintains a low temperature set in the refrigeration process. The first carrier gas through the carrier gas inlet C1 is still cut off, the two-way detector 380 is still the two-way carrier gas from the carrier gas inlet C2 and the carrier gas inlet C3, and the two-way detector 380 has no signal output as the state in the purging process.

And (3) analysis: close the first two-way solenoid valve 3901, the second two-way solenoid valve 3902, the third two-way solenoid valve 3903, the fourth two-way solenoid valve 3904, the three-way solenoid valve, and the micro-pump 350, open the electronic pressure controller 360, it is right the enricher 330 heats to accomplish desorption. The temperature at which the enricher 130 is heated is not less than 250 c and is stabilized at a suitable temperature, which is set as necessary, so that the sample gas enriched at a low temperature will be desorbed at a high temperature. The first carrier gas through the carrier gas inlet C1 is still cut off, the two-way detector 380 is still the two-way carrier gas from the carrier gas inlet C2 and the carrier gas inlet C3, and the two-way detector 380 has no signal output as the state in the purging process.

Sample introduction: closing the first two-way solenoid valve 3901 and the second two-way solenoid valve 3902, opening the third two-way solenoid valve 3903 and the fourth two-way solenoid valve 3904, opening the three-way solenoid valve, closing the micro-pump 350, and opening the electronic pressure controller 360. The six-way diaphragm valve 340 is switched, the driving gas port K7 is communicated with the third interface of the second three-way joint through the three-way electromagnetic valve 111, under the action of high-pressure carrier gas, the pressure range is greater than or equal to 0.4MPa, the six-way diaphragm valve 140 is switched, the flow path port K1 is communicated with the flow path port K6, the flow path port K2 is communicated with the flow path port K3, and the flow path port K4 is communicated with the flow path port K5. At this time, via the carrier gas inlet C1 the first carrier gas is still disconnected, the second carrier gas passes through the carrier gas inlet C2 through by the flow path port K1, flow path port K6, third two-way solenoid valve 3903, enricher 330, fourth two-way solenoid valve 3904, flow path port K3, flow path port K2, first chromatography column 371 and two-way detector 380 are linked together and form a sample introduction path, will the sample gas in the enricher 330 is sent to complete sample introduction in the first chromatography column 371. The temperature of the enricher 330 is maintained the same as that during desorption, so that the desorbed sample gas is fed into the first chromatography column 371 by a carrier gas. The third carrier gas from the carrier gas inlet C3 still passes through the second chromatographic column 372 and the dual path detector 380 and flows out of the vent O3.

And (3) detection: the first two-way solenoid valve 3901 and the three-way solenoid valve are closed, the second two-way solenoid valve 3902, the third two-way solenoid valve 3903, and the fourth two-way solenoid valve 3904 are opened, and the micro pump 350 and the electronic pressure controller 260 are opened. The six-way diaphragm valve 340 switches back to the purge condition due to the release air pressure. The purging of the concentrator 330 by the first purge path is completed by the first carrier gas through the carrier gas inlet C1, and the temperature of the concentrator 330 is maintained at a high temperature of not less than 250 ℃, and the specific temperature is set as required. The gas flowing through the two-way detector 380 is the carrier gas from the carrier gas inlet C2 and the carrier gas inlet C3, the state is the same as that in the purging process, the sample gas from the sample injection process continuously flows through the first chromatographic column 371 under the pushing of the carrier gas from the carrier gas inlet C2 to realize component separation, and then sequentially flows through the two-way detector 380 and finally flows out from the evacuation port O2; the third carrier gas from the carrier gas inlet C3 still passes through the second chromatographic column 372 and the dual path detector 380 and flows out of the vent O3. Since the pure carrier gas flows through one flow path of the two-way detector 380 and the carrier gas carries the separated sample gas component in the other flow path, the two-way detector 380 outputs a detection signal to complete the detection of the sample gas.

Example four

Referring to fig. 4, the present embodiment provides a dual-column gas chromatography apparatus based on six-way diaphragm valve auto-sampling, which is different from the third embodiment in that: in this embodiment, the enricher 330 of example three is replaced with a dosing ring 430 and the third and fourth two-

way solenoid valves

3903, 3904 are eliminated. The gas chromatography apparatus includes: the device comprises a filter 410, a gas resistor 420, a quantitative ring 430, a six-way diaphragm valve 440, a micro pump 450, an electronic pressure controller 460, a first chromatographic column 471, a second chromatographic column 472, a two-way detector 480, a first two-way solenoid valve 4901, a second two-way solenoid valve 4902, a three-way solenoid valve 411, a first three-way joint 4121 and a second three-way joint 4122. For specific connection, reference may be made to the third embodiment, which is not described herein. The quantitative ring 430, the first chromatographic column 471, the second chromatographic column 472 and the two-way detector 480 can be a quantitative ring, a chromatographic column and a detector prepared based on a traditional process, and can also be a quantitative ring, a chromatographic column and a detector chip prepared based on a micro-electro-mechanical system (MEMS) technology.

When the double-column gas chromatography device based on the six-way diaphragm valve automatic sample injection is adopted for detection, the gas chromatography device is firstly started, and then the main working process is as follows:

purging: the first two-way solenoid valve 4901 and the three-way solenoid valve are closed, the second two-way solenoid valve 4902 is opened, and the micro pump 450 and the electronic pressure controller 460 are opened. The drive air port K7 of the six-way diaphragm valve 440 communicates with the atmosphere, the flow path port K1 and the flow path port K2 communicate with each other, the flow path port K3 and the flow path port K4 communicate with each other, and the flow path port K5 and the flow path port K6 communicate with each other. The first interface of the second three-way joint, the air lock 420, the second two-way solenoid valve 4902, the second interface of the first three-way joint, the third interface of the first three-way joint, the flow path port K5, the flow path port K6, the quantitative ring 430, the flow path port K3, the flow path port K4, the micro pump 450 and the electronic pressure controller 460 are communicated to form a first purging path, the flow path port K1, the flow path port K2, the first chromatographic column 371 and the two-way detector 380 are communicated to form a second purging path, and the second chromatographic column 372 and the two-way detector 380 are communicated to each other. And a first carrier gas flows through the first purging path through the carrier gas inlet C1 and finally flows out of the evacuation port O1, so that purging of the enricher 430 is completed. The second carrier gas passes through the second purging path through the carrier gas inlet C2, and finally flows out from the evacuation port O2, so as to complete purging of one flow path of the first chromatographic column 471 and the two-way detector 480, the third carrier gas flows through the second chromatographic column 472 from the carrier gas inlet C3, enters the other flow path of the two-way detector 480, and flows out from the evacuation port O3, at this time, the carrier gas passes through both flow paths of the two-way detector 480, and no signal is output.

Sampling: the second two-way solenoid valve 4902 and the three-way solenoid valve are closed, the first two-way solenoid valve 4901 is opened, and the micro pump 450 and the electronic pressure controller 460 are opened. The filter 410, the first two-way solenoid valve 4901, the first three-way joint first port, the first three-way joint third port, the flow path port K5, the flow path port K6, the dosing ring 430, the flow path port K3, the flow path port K4 are communicated with each other, and the micro pump 450 and the electronic pressure controller 460 are communicated with each other, so that a sampling path is formed; the sample gas fills the dosing ring 430 via the sampling path to complete the sampling. At this time, the first carrier gas passing through the carrier gas inlet C1 is still cut off, the two-way detector 480 is still the two-way carrier gas from the carrier gas inlet C2 and the carrier gas inlet C3, and the two-way detector 480 does not output a signal as in the purging process.

Sample introduction: the first two-way solenoid valve 4901 and the second two-way solenoid valve 4902 are closed, the three-way solenoid valve is opened, the micro pump 450 is closed, and the electronic pressure controller 460 is opened. The six-way diaphragm valve 440 is switched, and the flow path port K1 and the flow path port K6 communicate with each other, the flow path port K2 and the flow path port K3 communicate with each other, and the flow path port K4 and the flow path port K5 communicate with each other. The flow path port K1, the flow path port K6, the quantitative ring 430, the flow path port K3, the flow path port K2, the first chromatographic column 471 and the two-way detector 480 are communicated to form a sample introduction path; the second carrier gas passes through the sample injection path via the carrier gas inlet C2, and the sample gas in the quantitative loop 430 is sent into the first chromatographic column 471 and flows out from the evacuation port O2 of the two-way detector 480, thereby completing sample injection. The third carrier gas from the carrier gas inlet C3 still passes through the second chromatographic column 372 and the dual path detector 380 and flows out of the vent O3.

And (3) detection: the first two-way solenoid valve 4901 and the three-way solenoid valve are closed, the second two-way solenoid valve 4902 is opened, and the micro pump 450 and the electronic pressure controller 460 are opened. The six-way diaphragm valve 440 switches back to the purge condition due to the release air pressure. The first carrier gas completes purging of the dosing ring 430 through the first purge path. The gas flowing through the two-way detector 480 is the carrier gas from the carrier gas inlet C2 and the carrier gas inlet C3, the state is the same as that in the purging process, the sample gas from the sample injection process continuously flows through the first chromatographic column 471 under the pushing of the carrier gas from the carrier gas inlet C2 to realize component separation, and then sequentially flows through the two-way detector 480 and finally flows out from the evacuation port O2; the third carrier gas from the carrier gas inlet C3 still passes through the second chromatographic column 472 and the dual path detector 480 and flows out of the evacuation port O3. Since the pure carrier gas flows through one flow path of the two-way detector 480 and the carrier gas carries the separated sample gas component in the other flow path, the two-way detector 480 outputs a detection signal to complete the detection of the sample gas.

It should be noted that the micropump in the above four embodiments can also be eliminated if the sample gas itself has a certain pressure, and the sample gas enters the enricher or the quantitative ring by the pressure of the sample gas itself to complete enrichment or sampling.

To sum up, the utility model discloses a gas chromatography device based on six-way diaphragm valve autoinjection has following beneficial effect:

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a gas chromatography device based on six-way diaphragm valve autoinjection which characterized in that, gas chromatography device includes:

a sampler comprising a sampler inlet and a sampler outlet;

a detector comprising a detector inlet and a detector outlet;

2. The gas chromatography apparatus of claim 1, wherein: the sampler comprises a dosing ring or enricher.

3. The gas chromatography apparatus of claim 2, wherein when said sampler employs said enricher, said gas chromatography apparatus further comprises:

4. The gas chromatography apparatus of claim 1, wherein: the detector comprises one of a hydrogen Flame Ionization Detector (FID), a Photo Ionization Detector (PID), and a Helium Ionization Detector (HID).

5. The gas chromatography device of claim 1, comprising a dual column gas chromatography device comprising:

6. The gas chromatography apparatus of claim 5, wherein: the detector comprises a Thermal Conductivity Detector (TCD).

7. The gas chromatography apparatus of claim 1, wherein: the gas chromatography device also comprises a micro pump and an electronic pressure controller connected with the micro pump, wherein one end of the micro pump is connected with the flow path port K4, and the other end of the micro pump is connected with the electronic pressure controller.

8. The gas chromatography apparatus of claim 1, wherein: the gas chromatography device further comprises one or a combination of a filter and an air resistor, wherein the filter is connected with the inlet of the first two-way electromagnetic valve, one end of the air resistor is connected with the first interface of the first three-way joint, and the other end of the air resistor is connected with the inlet of the second two-way electromagnetic valve.

9. The gas chromatography apparatus of claim 1, wherein: the driving pressure range of the six-way diaphragm valve is more than or equal to 0.4 MPa; the power consumption value of the electromagnetic valve is less than 1 watt; the size range of the electromagnetic valve is 1-10 cm; the weight range of the electromagnetic valve is 5 g-100 g.