阅读说明：本技术 气相检测装置 (Gas phase detection device ) 是由 张清军 李元景 陈志强 李荐民 孙尚民 朱伟平 王巍 杨内 曹彪 郝中原 于 2020-05-29 设计创作，主要内容包括：本公开的实施例提供一种气相检测装置。气相检测装置包括：采样气路,包括采集样品气体的采样头和用于储存采集的样品气体的第一、第二样品管；离子迁移管；进样气路,流体连通采样气路、离子迁移管和气相色谱柱；和阀组件,所述阀组件构造成在采样状态下允许导入样品气体至第一、第二样品管,在进样状态下允许样品气体从第一、第二样品管导入至所述离子迁移管和/或气相色谱柱。(Embodiments of the present disclosure provide a gas phase detection device. The gas phase detection device includes: the sampling gas circuit comprises a sampling head for collecting sample gas, and a first sample tube and a second sample tube for storing the collected sample gas; an ion transfer tube; the sample injection gas circuit is in fluid communication with the sampling gas circuit, the ion migration tube and the gas chromatographic column; and a valve assembly configured to allow introduction of sample gas into the first and second sample tubes in a sampling state and to allow introduction of sample gas from the first and second sample tubes into the ion transfer tube and/or gas chromatography column in a sample introduction state.)

1. A gas phase detection apparatus comprising:

the sampling gas circuit comprises a sampling head (20) for collecting sample gas, and a first sample tube (102) and a second sample tube (103) which are respectively connected with the sampling head and used for storing the sample gas collected by the sampling head;

an ion transfer tube (109) for detecting a sample gas;

the sample injection gas circuit is in fluid communication with the sampling gas circuit and the ion migration tube so as to respectively introduce the sample gas stored in the first sample tube (102) and/or the second sample tube (103) into the downstream ion migration tube; and

a valve assembly configured to allow introduction of a sample gas to the first sample tube (102) and/or the second sample tube (103) in a sampling state and to allow introduction of a sample gas from the first sample tube (102) and/or the second sample tube (103) to the ion transfer tube in a sample introduction state.

2. A gas detection apparatus according to claim 1, further comprising a gas chromatography column (104) arranged upstream of the ion transfer tube in the gas inlet path in the gas inlet direction, such that sample gas from the second sample tube (103) can pass the gas chromatography column before being fed into the ion transfer tube.

3. The gas phase detection apparatus according to claim 1,

the valve assembly comprises a first two-position three-way valve (101-1) and a second two-position three-way valve (101-2), a first sample pipe (102) is arranged between the first two-position three-way valve and the second two-position three-way valve, wherein the first sample pipe (102) is communicated with the sampling head through a first port of the first two-position three-way valve when the first two-position three-way valve is in the 1 position, and the first sample pipe (102) discharges gas through a first port of the second two-position three-way valve when the second two-position three-way valve is in the 1 position; and

the valve assembly comprises a third two-position three-way valve (101-3) and a fourth two-position three-way valve (101-4), and the second sample tube (103) is arranged between the third two-position three-way valve and the fourth two-position three-way valve, wherein the second sample tube (103) is in fluid communication with the sampling head through a first port of the third two-position three-way valve when the third two-position three-way valve is at the 1 position, and the second sample tube (103) discharges gas through a first port of the fourth two-position three-way valve when the fourth two-position three-way valve is at the 1 position.

4. The gas phase detection apparatus according to claim 1,

the valve component comprises a first two-position three-way valve (101-1) and a second two-position three-way valve (101-2), a first sample pipe (102) is arranged between the first two-position three-way valve and the second two-position three-way valve, wherein the first sample pipe (102) is in fluid communication with the sample gas path through a second port of the first two-position three-way valve so as to receive gas in the sample gas path when the first two-position three-way valve is at the 0 position, and the first sample pipe (102) is in fluid communication with the sample gas path through a second port of the second two-position three-way valve so as to send the sample gas into the sample gas path when the second two-position three-way valve is at the 0 position; and

the valve component comprises a third two-position three-way valve (101-3) and a fourth two-position three-way valve (101-4), the second sample tube (103) is arranged between the third two-position three-way valve and the fourth two-position three-way valve, when the third two-position three-way valve is at the 0 position, the second sample tube (103) is in fluid communication with the sample gas path through a second port of the third two-position three-way valve so as to receive gas of the sample gas path, and when the fourth two-position three-way valve is at the 0 position, the second sample tube (103) is in fluid communication with the sample gas path through a second port of the fourth two-position three-way valve so as to send the sample gas into the sample gas path.

5. The gas phase detection apparatus according to claim 4,

the ion migration tube comprises a first sample inlet (109A-1), and the sample gas path sends the sample gas from the second two-position three-way valve to the first sample inlet of the ion migration tube, so that the detection is carried out through the ion migration tube; and

the ion migration tube also comprises a second sample inlet (109B-1), the sample gas path sends the sample gas from the fourth two-position three-way valve into the gas chromatographic column, and then the sample gas is discharged from the gas chromatographic column and is introduced into the second sample inlet through the sample gas path to enter the ion migration tube for detection.

6. The gas phase detection apparatus according to claim 5, further comprising a fifth two-position three-way valve (101-5) having a first port in fluid communication with a second port of the third two-position three-way valve at position 1, flowing gas from the ion transfer tube to the second port of the third two-position three-way valve through the fifth two-position three-way valve, and disconnecting the sample gas path from the third two-position three-way valve at position 0.

7. The gas phase detection device according to claim 6, further comprising a sixth two-position three-way valve (101-6) disposed in the sample gas path, the sixth two-position three-way valve receiving gas from the fourth two-position three-way valve at position 1 and sending the gas into the gas chromatography column through a first port thereof, the sixth two-position three-way valve disconnecting the gas path to the gas chromatography column at position 0 and discharging the gas to the outside through a second port thereof in fluid communication with the filter.

8. A gas detection apparatus according to claim 7, further comprising a second three-way valve (140-2) arranged between the sixth two-position three-way valve and the gas chromatography column, the second three-way valve connecting the first port of the sixth two-position three-way valve, the gas chromatography column and the second port of the fifth two-position three-way valve.

9. The gas detection apparatus of claim 7, further comprising a chromatography booster pump (110B) disposed upstream of the fifth two-position three-way valve, the drive gas entering the gas chromatography column along the sample gas path and being pressurized when the fifth two-position three-way valve is at position 0.

10. A gas phase detection apparatus according to claim 3, wherein

The sampling gas circuit also comprises a sampling pump (110C) and a seventh two-position three-way valve (101-7), the sampling pump is connected with the seventh two-position three-way valve, the seventh two-position three-way valve is connected with the first and second two-position three-way valves through a first three-way valve (140-1), so that the seventh two-position three-way valve is at the 0 position, the first sample tube and/or the second sample tube are allowed to be in fluid communication with the sampling pump, and the sampling pump can drive the sampling head to extract a sample to the first sample tube and/or the second sample tube.

11. The gas phase detection apparatus of claim 10, wherein the gas phase detection apparatus comprises a first filter (107-1) configured to filter gas flowing through the first filter and allow gas to pass through the first filter into the sample gas path such that the sample pump can back-drive gas filtered through the first filter into the first sample tube and/or the second sample tube via the seventh two-position, three-way valve and then out of the sample head.

12. The gas phase detection apparatus of claim 1, further comprising an online internal calibration gas circuit comprising a calibrant container (113) providing a calibrant and a calibration solenoid valve (112) connecting the calibrant container to the sample gas circuit, the calibration solenoid valve configured to provide a trace amount of the calibrant into the sample gas circuit by an on-off operation during detection of the gas phase detection apparatus.

13. The gas phase detection apparatus according to claim 5,

the gas phase detection device also comprises an internal circulation gas path, so that at least one part of gas discharged from the gas outlet of the ion migration tube is returned to the migration gas inlet of the ion migration tube by the internal circulation gas path, and the migration gas inlet is configured for the migration gas to flow into the ion migration tube;

at least one part of gas discharged from a gas outlet of the ion migration tube is sent back to the second port of the first two-position three-way valve by the first sample injection gas path branch of the sample injection gas path and/or sent back to the second port of the third two-position three-way valve by the second sample injection gas path branch of the sample injection gas path.

14. The gas phase detection apparatus according to claim 12,

the internal circulation gas circuit comprises a first buffer cavity, a second buffer cavity and a circulation driving pump arranged between the first buffer cavity and the second buffer cavity, the first buffer cavity receives gas exhausted by the ion migration tube and absorbs vibration caused by the gas, the gas exhausted by the first buffer cavity flows to the second buffer cavity under the action of the circulation driving pump, one part of the gas exhausted by the second buffer cavity circulates in the internal circulation gas circuit as migration gas of the ion migration tube, and the other part of the gas enters the sample injection gas circuit.

15. The gas phase detection apparatus of claim 1, wherein the first sample tube and the second sample tube are configured to have a set fixed volume.

16. A gas phase detection apparatus according to claim 5, wherein

The sampling head is close to the detected target, the first two-position three-way valve and the second two-position three-way valve are in the 1 position, and the sample gas is collected through the sampling head and enters the first sample pipe; then the first two-position three-way valve and the second two-position three-way valve are switched to 0 position, and the gas in the sample introduction gas circuit drives the sample gas in the first sample tube to enter the ion migration tube for detection; or

The operation is in a second detection mode, the sampling head is close to the detected target, the third two-position three-way valve and the fourth two-position three-way valve are positioned at 1 position, and the sample gas is collected by the sampling head and enters a second sample tube; then the third two-position three-way valve and the fourth two-position three-way valve are switched to the 0 position, and the gas in the sample introduction gas circuit drives the sample gas in the second sample tube to enter the gas chromatographic column and then enter the ion migration tube for detection; or

The operation is in a third detection mode, the sampling head is close to the detected target, the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve and the fourth two-position three-way valve are in the 1 position, and the sample gas is collected by the sampling head and respectively enters the first sample tube and the second sample tube; then the first two-position three-way valve and the second two-position three-way valve are switched to the 0 position, gas in the sample injection gas path drives sample gas of the first sample tube to enter the ion migration tube for detection, whether the sample gas contains suspected substances is determined, if the sample gas of the first sample tube is detected by the ion migration tube to not contain the suspected substances, the third two-position three-way valve, the fourth two-position three-way valve and the sixth two-position three-way valve are switched to the 0 position, and the sample gas from the second sample tube is discharged; or

Operating as a fourth detection mode, if the sample gas of the first sample tube is detected by the ion mobility tube as containing the suspected substance, the sixth two-way three-way valve is switched to the 1 position, so that the sample gas from the second sample tube is driven into the gas chromatography column and then into the ion mobility tube, thereby implementing quantitative detection.

17. The gas phase detection apparatus according to claim 5, configured to present the detection result on the same spectrum based on the detection of the sample gas by the ion mobility tube and the difference in the detection time of the sample by the gas chromatography column-ion mobility tube, and comprehensively determine the detection result.

18. The gas phase detection apparatus of claim 16, configured to compare a detection result of the sample gas in the first sample tube with a detection result of the sample gas in the second sample tube.

Technical Field

The invention relates to the field of gas phase detection, in particular to a gas phase detection device.

Background

The ion mobility spectrometry technology is a detection technology under the atmospheric pressure environment, has the characteristics of sensitivity, quick response and the like, can finish the detection and identification of simple chemical components in a very short time, and is mainly used for detecting drugs and explosives by a large amount of equipment such as customs and airports in recent years. The gas chromatograph is a generally accepted high-efficiency and high-stability separation tool at present, and has wide application in separation analysis and quantitative detection of gas substances.

The gas chromatography technology and the ion mobility spectrometry technology are combined (GC-IMS), so that the separation and analysis of mixed complex chemical components can be realized, the content of each component can be detected and judged, and the method is very suitable for detecting toxic and harmful gases, mixed explosives, drugs and other contraband articles in complex environments.

The existing detection technology has insufficient resolution capability on complex components or long detection time, is difficult to meet the requirements of rapid and accurate detection of on-site complex detection environment and complex detected targets, and is also difficult to realize the requirement of quantitative detection.

Disclosure of Invention

An embodiment of the present disclosure provides a gas phase detection apparatus, including:

the sampling gas circuit comprises a sampling head for collecting sample gas, and a first sample tube and a second sample tube which are respectively connected with the sampling head and used for storing the collected sample gas;

an ion mobility tube, which may be, for example, for detecting a composition of a sample gas, may include, for example, a sample inlet through which the sample gas and a carrier gas flow in, a gas outlet through which the gas flows out, and a mobility gas inlet through which a mobility gas flows in;

the sample injection gas circuit is in fluid communication with the sampling gas circuit and the ion migration tube so as to guide the sample gas stored in the first sample tube and/or the second sample tube into the ion migration tube; and

a valve assembly configured to allow introduction of a sample gas to the first sample tube and/or the second sample tube in a sampling state and to allow introduction of a sample gas from the first sample tube and/or the second sample tube to the ion transfer tube in a sample introduction state.

In one embodiment, the gas detection apparatus further comprises a gas chromatography column arranged upstream of the ion mobility tube in the gas inlet path in the gas inlet direction, so that the sample gas from the second sample tube can pass through the gas chromatography column before being sent into the ion mobility tube.

In one embodiment, the valve assembly includes a first two-position, three-way valve and a second two-position, three-way valve, the first sample line being disposed between the first two-position, three-way valve and the second two-position, three-way valve, wherein the first sample line is in fluid communication with the sampling head through a first port of the first two-position, three-way valve when the first two-position, three-way valve is in the 1 position, and the first sample line exhausts gas through a first port of the second two-position, three-way valve when the second two-position, three-way valve is in the 1 position; and

the valve assembly includes a third two-position three-way valve and a fourth two-position three-way valve, the second sample tube is disposed between the third two-position three-way valve and the fourth two-position three-way valve, wherein the second sample tube is in fluid communication with the sampling head through a first port of the third two-position three-way valve when the third two-position three-way valve is at the 1 position, and the second sample tube discharges gas through a first port of the fourth two-position three-way valve when the fourth two-position three-way valve is at the 1 position.

In one embodiment, the valve assembly includes a first two-position three-way valve and a second two-position three-way valve, the first sample tube is disposed between the first two-position three-way valve and the second two-position three-way valve, wherein the first sample tube is in fluid communication with the sample gas path through a second port of the first two-position three-way valve when the first two-position three-way valve is in the 0 position so as to receive the gas of the sample gas path, and the first sample tube is in fluid communication with the sample gas path through a second port of the second two-position three-way valve when the second two-position three-way valve is in the 0 position so as to send the sample gas into the sample gas path; and

the valve component comprises a third two-position three-way valve and a fourth two-position three-way valve, the second sample tube is arranged between the third two-position three-way valve and the fourth two-position three-way valve, the second sample tube is communicated with the sample injection gas path through a second port of the third two-position three-way valve when the third two-position three-way valve is at the 0 position so as to receive gas of the sample injection gas path, and the second sample tube is communicated with the sample injection gas path through a second port of the fourth two-position three-way valve when the fourth two-position three-way valve is at the 0 position so as to send the sample gas into the sample injection gas path.

In one embodiment, the sample inlet of the ion transfer tube comprises a first sample inlet, and the sample gas path sends the sample gas from the second two-position three-way valve to the first sample inlet of the ion transfer tube, so that the detection is implemented through the ion transfer tube; and

the sample inlet of the ion migration tube further comprises a second sample inlet, the sample gas path sends the sample gas from the fourth two-position three-way valve into the gas chromatographic column, and then the sample gas is discharged from the gas chromatographic column and enters the ion migration tube for implementation and detection by leading the sample gas path into the second sample inlet.

In one embodiment, the gas phase detection device further comprises a fifth two-position three-way valve, wherein a first port of the fifth two-position three-way valve is in fluid communication with a second port of the third two-position three-way valve at the 1 position, gas from the ion transfer pipe flows to the second port of the third two-position three-way valve through the fifth two-position three-way valve, and the sample gas path is disconnected from the fluid communication with the third two-position three-way valve at the 0 position.

In one embodiment, the gas detection device further comprises a sixth two-position three-way valve, which is arranged in the sample gas path, and receives gas from the fourth two-position three-way valve at position 1 and sends the gas into the gas chromatographic column through a first port of the sixth two-position three-way valve, and the sixth two-position three-way valve cuts off the gas path flowing to the gas chromatographic column at position 0 and discharges the gas to the outside through a second port of the sixth two-position three-way valve, which is in fluid communication with the filter.

In one embodiment, the gas detection apparatus further comprises a second tee disposed between the sixth two-position, three-way valve and the gas chromatography column, the second tee connecting the first port of the sixth two-position, three-way valve, the gas chromatography column, and the second port of the fifth two-position, three-way valve.

In one embodiment, the gas detection apparatus further comprises a gas chromatography booster pump arranged upstream of the fifth two-position three-way valve, and when the fifth two-position three-way valve is at the 0 position, the driving gas enters the gas chromatography column along the sample gas path and is boosted.

In one embodiment, the sampling gas circuit further comprises a sampling pump and a seventh two-position three-way valve, the sampling pump is connected with the seventh two-position three-way valve, the seventh two-position three-way valve is connected with the first and second two-position three-way valves through the first three-way valve, so that the seventh two-position three-way valve is at the 0 position, the first sample tube and/or the second sample tube are allowed to be in fluid communication with the sampling pump, and the sampling pump can drive the sampling head to extract a sample to the first sample tube and/or the second sample tube.

In one embodiment, the valve assembly includes a first filter configured to filter gas flowing through the first filter and allow gas to pass through the first filter into the sampling gas circuit such that the sampling pump can back-drive gas filtered through the first filter into the first sample tube and/or the second sample tube via the seventh two-position, three-way valve and then out of the sampling head.

In one embodiment, the gas phase detection device further comprises an online internal calibration gas circuit comprising a calibrant container providing the calibrant and a calibration solenoid valve connecting the calibrant container to the sample gas circuit, the calibration solenoid valve configured to provide a trace amount of the calibrant into the sample gas circuit by an on-off operation during detection of the gas phase detection device.

In one embodiment, the gas phase detection device further comprises an internal circulation gas path, so that at least one part of the gas discharged from the gas outlet of the ion migration tube is sent back to the migration gas inlet of the ion migration tube by the internal circulation gas path;

at least one part of gas discharged from a gas outlet of the ion migration tube is sent back to the second port of the first two-position three-way valve by the first sample injection gas path branch of the sample injection gas path and/or sent back to the second port of the third two-position three-way valve by the second sample injection gas path branch of the sample injection gas path.

In one embodiment, the internal circulation gas path comprises a first buffer cavity, a second buffer cavity and a circulation driving pump arranged between the first buffer cavity and the second buffer cavity, the first buffer cavity receives gas exhausted by the ion migration tube and absorbs vibration caused by the gas, the gas exhausted by the first buffer cavity flows to the second buffer cavity under the action of the circulation driving pump, one part of the gas exhausted by the second buffer cavity circulates in the internal circulation gas path as migration gas of the ion migration tube, and the other part of the gas enters the sample injection gas path.

In one embodiment, the first sample tube and the second sample tube are configured to have a set fixed volume.

In one embodiment, the operation is a first detection mode, the sampling head is close to the detected target, the first two-position three-way valve and the second two-position three-way valve are in 1 position, and the sample gas is collected by the sampling head and enters the first sample tube; then the first two-position three-way valve and the second two-position three-way valve are switched to 0 position, and the gas in the sample introduction gas circuit drives the sample gas in the first sample tube to enter the ion migration tube for detection; or

The operation is in a second detection mode, the sampling head is close to the detected target, the third two-position three-way valve and the fourth two-position three-way valve are positioned at 1 position, and the sample gas is collected through the sampling head and enters a second sample tube; then the third two-position three-way valve and the fourth two-position three-way valve are switched to the 0 position, and the gas in the sample introduction gas circuit drives the sample gas in the second sample tube to enter the gas chromatographic column and then enter the ion migration tube for detection; or

The operation is in a third detection mode, the sampling head is close to the detected target, the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve and the fourth two-position three-way valve are in the 1 position, and the sample gas is collected by the sampling head and respectively enters the first sample tube and the second sample tube; then the first two-position three-way valve and the second two-position three-way valve are switched to the 0 position, gas in the sample injection gas path drives sample gas of the first sample tube to enter the ion migration tube for detection, whether the sample gas contains suspected substances is determined, if the sample gas of the first sample tube is detected by the ion migration tube to not contain the suspected substances, the third two-position three-way valve, the fourth two-position three-way valve and the sixth two-position three-way valve are switched to the 0 position, and the sample gas from the second sample tube is discharged; or

Operating as a fourth detection mode, if the sample gas of the first sample tube is detected by the ion mobility tube as containing the suspected substance, the sixth two-way three-way valve is switched to the 1 position, so that the sample gas from the second sample tube is driven into the gas chromatography column and then into the ion mobility tube, thereby implementing quantitative detection.

In one embodiment, the gas phase detection device is configured to present the detection result on the same spectrogram based on the detection of the sample gas by the ion mobility tube and the detection time difference of the sample by the gas chromatography column-ion mobility tube, and comprehensively judge the detection result.

In one embodiment, the gas phase detection apparatus is configured to compare the detection result of the sample gas in the first sample tube with the detection result of the sample gas in the second sample tube.

The present disclosure also provides a sniffing device comprising the above gas phase detection apparatus.

Drawings

FIG. 1 is a schematic view of a gas phase detection apparatus according to one embodiment of the present disclosure.

Detailed Description

While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the drawings and detailed description thereto are not intended to limit the disclosure to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims. The figures are for illustration and are not drawn to scale.

The embodiment of the present disclosure provides a gas phase detection apparatus, as shown in the figure, the upper part of fig. 1 can be regarded as a gas path part for sampling, the lower ion mobility tube 109 and the gas chromatography column 104 can be regarded as a part for detection, and a gas path for communicating the gas path part for sampling and the part for detection is also provided. However, the gas phase detection device may be divided in other ways, and this is only for illustration of one division used.

In one embodiment, a gas phase detection apparatus includes: the sampling gas circuit comprises a sampling head 20 for collecting sample gas, and a first sample tube 102 and a second sample tube 103 which are respectively connected with the sampling head and used for storing the sample gas collected by the sampling head; an ion transfer tube 109 for detecting a sample gas; the sample injection gas circuit is in fluid communication with the sampling gas circuit and the ion migration tube so as to respectively introduce the sample gas stored in the first sample tube 102 and/or the second sample tube 103 into the downstream ion migration tube; and a valve assembly configured to allow introduction of sample gas to the first sample tube 102 and/or the second sample tube 103 in a sampling state and to allow introduction of sample gas from the first sample tube 102 and/or the second sample tube 103 to the ion transfer tube in a sample introduction state.

The upper gas path portion for sampling of fig. 1 may include a sampling head 20 for collecting sample gas and a first sample tube 102 and/or a second sample tube 103 connected to the sampling head, respectively, for storing the collected sample gas. In the embodiment shown in fig. 1, the sampling gas circuit includes a first sample tube 102 and a second sample tube 103, each of which may be used to store a fixed amount of sample gas. The present disclosure is advantageous in that two sample tubes for storing a fixed amount of sample gas can be used to simultaneously collect sample gas using two sample tubes, so that it is possible to achieve minimum or even substantially no difference in the components of the sample gas collected by the two sample tubes, and to allow sample gas of the same component to be provided at the same time or time-divisionally for different detections, or to provide sample gas of only one sample tube, greatly facilitating the detection operation, and improving the adaptability, efficiency and reliability of the measurement.

The sampling gas circuit also comprises a valve assembly. For example, as shown in fig. 1, the valve assembly includes a first two-position three-way valve 101-1 and a second two-position three-way valve 101-2, and a first sample pipe 102 is disposed between both the first two-position three-way valve 101-1 and the second two-position three-way valve 101-2. When the first two-position three-way valve 101-1 is at the 1 position, the first sample pipe 102 is in fluid communication with the sampling head 20 through a first port of the first two-position three-way valve 101-1, and when the second two-position three-way valve 101-2 is at the 1 position, the first sample pipe 102 discharges gas through a first port of the second two-position three-way valve 101-2; when the second two-position three-way valve 101-2 is at the 0 position, the first sample tube 102 is in fluid communication with the sample gas path through a second port of the second two-position three-way valve 101-2 to send the sample gas into the sample gas path; when the first two-position three-way valve 101-1 is at the 0 position, the first sample tube 102 is in fluid communication with the sample gas path through the second port of the first two-position three-way valve 101-1 so as to receive the gas from the sample gas path. During operation, the first two-position three-way valve 101-1 is at position 1, and the sample gas enters the first sample tube 102, so that the sample gas can be temporarily stored in the first sample tube 102, and during actual operation, the storage process is extremely short, and the sample gas rapidly enters the sample injection gas path through the second port of the second two-position three-way valve 101-2; the gas phase detection device can also be operated, the first two-position three-way valve 101-1 and the second two-position three-way valve 101-2 are switched to 0 position, the sampling gas path and the sample introduction gas path form a loop, and the sample gas is sent to the downstream ion migration tube for detection.

The valve assembly comprises a third two-position, three-way valve 101-3 and a fourth two-position, three-way valve 101-4, and the second sample tube 103 is arranged between the third two-position, three-way valve 101-3 and the fourth two-position, three-way valve 101-4. When the third two-position three-way valve 101-3 is at the 1 position, the second sample tube 103 is in fluid communication with the sampling head 20 through the first port of the third two-position three-way valve 101-3, and when the fourth two-position three-way valve 101-4 is at the 1 position, the second sample tube 103 discharges gas through the first port of the fourth two-position three-way valve 101-4; when the third two-position three-way valve 101-3 is at the 0 position, the second sample tube 103 is in fluid communication with the sample gas path through the second port of the third two-position three-way valve 101-3 so as to receive the gas of the sample gas path, and when the fourth two-position three-way valve 101-4 is at the 0 position, the second sample tube 103 is in fluid communication with the sample gas path through the second port of the fourth two-position three-way valve 101-4 so as to send the sample gas into the sample gas path. In operation, with the third two-position, three-way valve 101-3 in position 1, sample gas enters the second sample cell 103, and the sample gas can be temporarily stored in the second sample cell 103, although it should be appreciated that this storage is extremely brief; the gas phase detection device is also operable such that the third two-position three-way valve 101-3 and the fourth two-position three-way valve 101-4 are switched to the 0 position, and the sample gas is sent downstream to perform detection or discharge. The above embodiment can realize the separate sampling of the first sample tube 102 and the second sample tube 103. For example, in one case, the sample head 20 is close to the inspected article, the first two-position three-way valve 101-1 is at position 1, the third two-position three-way valve 101-3 is at position 0, and the sample gas enters only the first sample tube 1002. In another case, the sample head 20 is close to the inspected object, the first two-position three-way valve 101-1 is at the 0 position, the third two-position three-way valve 101-3 is at the 1 position, and the sample gas only enters the second sample tube 103. In another case, the first two-position three-way valve 101-1 and the third two-position three-way valve 101-3 are both at position 1, and the sample gas enters the first sample tube 102 and the second sample tube 103 at the same time and can be stored in the first sample tube 102 and the second sample tube 103 for standby.

The embodiment of the disclosure uses a configuration mode that a plurality of two-position three-way valves are combined with two sample tubes, so that the function of collecting, for example, quantitative sample gas through switching of the valve assembly (for example, pulse sampling is realized through rapid switching of the valves) is realized, and the amount of the sample gas can be determined through the volume of the sample tubes, so that the sampling action is rapid and accurate. Typically the volume of the sample tube is of the order of a milliliter, such as one milliliter, 0.5 milliliter or other volume, and each sample automatically collects a determined volume of sample gas, such as one milliliter, 0.5 milliliter or other volume.

The sampling gas circuit further comprises a sampling pump 110C and a seventh two-position three-way valve 101-7, the sampling pump 110C is connected with the seventh two-position three-way valve 101-7, the seventh two-position three-way valve 101-7 is respectively connected with the first and second two-position three-way valves 101-1 and 101-2 through a first three-way 140-1, so that when the seventh two-position three-way valve 101-7 is at the 0 position, the first sample tube 102 and/or the second sample tube 103 are allowed to be in fluid communication with the sampling pump 110C, and the sampling pump 110C can drive the sampling head 20 to extract a sample from a detected object into the first sample tube 102 and/or the second sample tube 103.

In a sampling state, when the first two-position three-way valve 101-1 and the second two-position three-way valve 101-2 are connected at the 1 position and the seventh two-position three-way valve 101-7 is at the 0 position, the sampling pump 110C drives the sampling head 20 to suck sample gas, and the sample gas enters the first sample pipe 102; then the connection of the first and second two-position three-way valves 101-1, 101-2 is switched to 0 position, the pumping of the sample is finished, and the sample gas is stored in the first sample pipe 102, thereby realizing the independent sampling of the first sample pipe 102.

In another sampling state, when the third and fourth two-position three-way valves 101-3, 101-4 are connected at the 1 position and the seventh two-position three-way valve 101-7 is at the 0 position, the sampling pump 110C drives the sampling head 20 to suck the sample gas, and the sample gas enters the second sample tube 103; then, the connection of the third and fourth two-position three-way valves 101-3 and 101-4 is switched to the 0 position, the pumping of the sample is completed, and the sample gas is stored in the second sample pipe 103, thereby realizing the independent sampling of the second sample pipe 103.

In another sampling state, the first and second two-position three-way valves 101-1 and 101-2 are connected at the 1 position, the third and fourth two-position three-way valves 101-3 and 101-4 are connected at the 1 position, the seventh two-position three-way valve 101-7 is at the 0 position, the sampling pump 110C drives the sampling head 20 to suck the sample gas, and the sample gas enters the first sample pipe 102 and the second sample pipe 103; then the connection of the first and second two-position three-way valves 101-1 and 101-2 is switched to the 0 position, and the connection of the third and fourth two-position three-way valves 101-3 and 101-4 is switched to the 0 position, the pumping of the sample is finished, and the sample gas is stored in the first sample pipe 102 and the second sample pipe 103, thereby realizing the simultaneous sampling of the two sample pipes.

As can be seen from the above, the gas phase detection apparatus of the present disclosure can realize separate sampling and storage of the first sample tube 102 and the second sample tube 103, and can also realize simultaneous sampling and storage, thereby making the function of the gas phase detection apparatus richer.

The gas phase detection device includes a first filter 107-1 configured to filter gas flowing through the first filter 107-1, as shown, the first filter 107-1 is connected to the external environment, which allows the sampling pump 110C to draw a sample.

In one embodiment, the sampling gas path allows the first sample tube 102, the second sample tube 103, and the sampling head 20 to be purged with gas. As shown in fig. 1, the sampling pump 110C pumps the gas through the first filter 107-1 and drives the filtered gas into the sampling gas path, the filtered gas flows to the seventh two-position three-way valve 101-7 via the sampling pump 110C, the seventh two-position three-way valve 101-7 is at the 0 position, and the filtered gas then enters the first sample tube 102 and/or the second sample tube 103 and finally is discharged from the sampling head 20. The filtered gas can be cleaned by the sampling gas circuit. The sampling gas circuit of the present disclosure is advantageous in that it can collect and store sample gas in either or both of the two sample tubes, and also allows for cleaning of the sampling gas circuit (including the first sample tube 102, the second sample tube 103, and the sampling head 20) by one sampling pump 110C, resulting in a compact gas circuit.

As shown in fig. 1, the ion transfer tube 109 is an integrated dual-mode all-ceramic transfer tube having a first ion transfer tube 109A and a second ion transfer tube 109B. However, the ion transfer tube 109 may also be single mode.

The ion transfer tube 109 may include sample inlet ports 109A-1, 109B-1 for inflow of the sample gas and the carrier gas, gas outlet ports 109A-2, 109B-2 for outflow of the gas, and transfer gas inlet ports 109A-3, 109B-3 for inflow of the transfer gas.

As shown in fig. 1, the sample inlet of the ion mobility tube 109 includes a first sample inlet 109A-1, and the sample gas path sends the sample gas from the second two-way three-way valve 101-2 to the first sample inlet 109A-1 of the ion mobility tube 109, so that the sample gas enters the ion mobility tube 109 and is detected, for example, the component of the sample gas is determined, by the ion mobility tube 109. The sample inlet of the ion mobility tube 109 further comprises a second sample inlet 109B-1, the sample gas path firstly sends the sample gas from the fourth two-position three-way valve 101-4 into the gas chromatography column 104, and then the sample gas is discharged from the gas chromatography column 104, and is introduced into the second sample inlet 109B-1 through the sample gas path and enters the ion mobility tube 109 for detection. The sample gas firstly passes through the gas chromatographic column 104, so that the separation of the sample gas can be realized, the passing time of gas substances with different components in the gas chromatographic column 104 is different, the time for each component of gas to pass through the gas chromatographic column 104 can be called as the retention time of the component of gas in the gas chromatographic column 104, each component of gas subsequently enters the ion migration tube, a corresponding spectral peak is obtained by detection, the value of the peak changes along with the concentration of the component of gas, the concentration of the component of gas can be determined by integration, and the content of the component of gas can be obtained by combining with a sample tube with a fixed volume.

The sample gases in the first sample tube 102 and the second sample tube 103 are respectively introduced into the ion mobility tube 109 through respective gas paths (which may be referred to as sample gas path branches) to realize respective detection, so that mutual interference of the sample gases is avoided.

In the embodiment of the present disclosure, the gas detection apparatus further includes a gas chromatography column 104, the gas chromatography column 104 is used for separating a mixed gas of complex components, and measuring retention time of gases of different components in the gas chromatography column 104; the gas chromatography column 104 is connected in series between the sampling gas path and the ion mobility tube 109, so that the sample gas in the second sample tube 103 firstly enters the gas chromatography column 104 for detection and then enters the ion mobility tube 109 for detection, and thus the gas chromatography column 104 can be combined with the ion mobility tube 109 to measure the content of the gas with different components relative to the volume of the fixed sample tube.

The gas phase detection device of the present disclosure can determine whether to further perform quantitative detection of the gas chromatography column 104 — the ion mobility tube 109 on the sample gas in the second sample tube 103 based on the qualitative detection of the sample gas from the first sample tube 102 by the ion mobility tube 109, and comprehensively determine the detection result.

The embodiment of the disclosure can meet the requirements that the first sample tube 102 and the second sample tube 103 are used for sampling simultaneously, then the sample gas of the first sample tube 102 is qualitatively detected through the ion mobility tube 109, and if the sample gas contains a suspected substance, the sample gas of the second sample tube 103 is sent to the gas chromatography column 104-the ion mobility tube 109 for quantitative detection, so as to obtain the content of the samples with various components. If the sample gas does not contain the suspected substance, the sample gas in the second sample tube 103 is discharged. This is advantageous, on the one hand, because of the provision of the double sample cell sampling, sample gases of substantially uniform composition can be separately collected at the same time; on the other hand, a simple and rapid qualitative inspection can be performed, the gas in the second sample tube can be directly discharged under the condition that the sample gas does not contain the suspected substance, if the sample gas contains the suspected substance, quantitative inspection is performed according to the condition, and the detected object can leave the collecting area after the sample gas is collected, so that the collecting efficiency is high, and even if the sample gas contains the suspected substance through the qualitative inspection, the detected object does not need to return to the collecting area again, and only the sample gas in the second sample tube needs to be measured quantitatively.

The gas phase detection device of the present disclosure includes a sample gas path, which is in fluid communication with the sampling gas path, the ion mobility tube 109 and the gas chromatography column 104, so as to introduce the quantitative sample gas stored in the first sample tube 102 and/or the second sample tube 103 into the ion mobility tube 109 and/or the gas chromatography column 104.

In the embodiment shown in fig. 1, the gas phase detection apparatus further comprises an internal circulation gas path, such that at least a portion of the gas discharged from the gas outlet of the ion mobility tube 109 is returned to the mobility gas inlet of the ion mobility tube 109 by the internal circulation gas path; at least a portion of the gas exiting the gas outlet of the ion transfer tube 109 is routed back to the second port of the first two-position three-way valve 101-1 and/or the second port of the third two-position three-way valve 101-3 by the sample gas path. The internal circulation gas circuit comprises a circulation driving pump, such as a diaphragm pump, and can drive gas to circulate in the internal circulation gas circuit. In order to avoid vibration, the internal circulation air passage includes a first buffer chamber 102A and a second buffer chamber 102B, and the circulation drive pump is disposed between the first buffer chamber 102A and the second buffer chamber 102B. The first buffer cavity 102A receives the gas exhausted from the ion mobility tube 109 and absorbs the vibration of the gas, the gas exhausted from the first buffer cavity 102A flows to the second buffer cavity 102B under the action of the circulating drive pump, the second buffer cavity 102B absorbs the vibration of the gas, one part of the gas exhausted from the second buffer cavity 102B circulates in the internal circulating gas path as the mobility gas of the ion mobility tube 109, and the other part of the gas enters the sample injection gas path. The first and second buffer chambers 102A and 102B can reduce the influence of the pulsed gas flow of the first pump 103A on the gas flow in the ion mobility spectrometer and reduce the influence of the pulsed gas flow on the gas chromatography column 104.

The internal circulation gas path further comprises a flow control valve disposed between the ion transfer tube 109 and the first buffer chamber 102A, so that a user can select to perform simultaneous detection in only the negative mode or only the positive mode or both the negative and positive modes depending on whether the electrophilic property or the nucleophilic property of the sample to be detected balances or switches off the non-corresponding detection mode, thereby improving the selective detection of the sample by the instrument. In the embodiment shown in fig. 1, the first ion mobility tube 109 and the second ion mobility tube 109 of the dual mode ion mobility tube 109 are connected to one flow control valve, respectively.

The internal circulation gas path further includes a second filter 107-2 disposed between the first buffer chamber 102A and the second buffer chamber 102B, and the second filter 107-2 can filter the gas discharged from the first buffer chamber 102A, and the filtered gas enters the second buffer chamber 102B, thereby avoiding a clean filter disposed on the circulation gas path again, and saving the manufacturing cost. It should be noted that, in some other embodiments of the present disclosure, the second filter 107-2 may be disposed at other positions of the sample gas path, for example, between the first buffer cavity 102A and the gas outlet of the ion transfer tube 109.

The internal circulation gas path further includes a gas supply/release gas path for supplying gas into the ion transfer tube 109 or releasing gas to the ion transfer tube 109, a first port of the gas supply/release gas path is communicated with a gas outlet of the ion transfer tube 109, and a second port of the gas supply/release gas path is communicated with the external environment. The air supply/release gas circuit can make the ion migration tube 109 automatically supply air and release air according to the change of environment, micro-sampling, the temperature of the ion migration tube 109 and the like, thereby realizing rapid sampling.

In one embodiment, a third filter 107-3 is disposed on the gas supply/release path to purify the gas flowing through the gas supply/release path, so as to reduce the influence of the outside on the ion mobility spectrometer and improve the service life of the gas purifying agent (molecular sieve, activated carbon, etc.).

The internal circulation gas circuit also comprises a three-way valve 105 which is arranged between the circulation driving pump and the filter, and the first port of the air supply/release gas circuit is communicated with the internal circulation gas circuit through the three-way valve 105. The three-way valve 105 is configured to allow only gas to flow from the circulation-driven pump to the second filter 107-2 in the sample injection state, and not to flow from the three-way valve 105 to the outside; in the deflated state, gas is only allowed to flow from the cycle driven pump to the ambient environment, and not to the second filter 107-2; the external air is allowed to flow to the second filter 107-2 in the air-supplemented state. The sample inlet gas circuit, the gas supplementing gas circuit and the gas releasing gas circuit can be selectively communicated through the three-way valve 105.

A water trap filter 108 is further disposed on the gas supply/discharge path, and the water trap filter 108 is located between the third purifying filter 107-3 and the external environment, so as to further reduce the influence of the external environment on the ion mobility spectrometer.

The gas in the internal circulation gas path is discharged from the second buffer chamber 102B, and a part of the gas circulates in the internal circulation gas path and flows back to the ion transfer tube 109, and the part of the gas can flow from the two flow paths to the first ion transfer tube 109 and the second ion transfer tube 109, respectively. Further, a flow regulator may be provided to regulate the flow rate of the gas flowing to the first ion mobility tube 109 and the second ion mobility tube 109. A flow regulator may be provided between the second buffer chamber 102B and the ion transfer tube 109.

It is advantageous that the gas detection apparatus includes an internal circulation gas circuit, which allows the circulation-driven pump to keep working, and gas circulates in the internal circulation gas circuit, so that the sample gas in the first sample tube 102 and/or the second sample tube 103 can be fed into the ion mobility tube 109 and the gas chromatography column 104 in real time; and because the filter is arranged, the gas in the sample feeding gas circuit can be kept clean; because the air supply/air release gas circuit is arranged, the gas pressure in the sample injection gas circuit can be kept as a set value.

In one embodiment, the gas phase detection device further comprises a fifth two-position three-way valve 101-5, wherein the first port is communicated with the second port of the third two-position three-way valve 101-3 at the position 1, and the fluid communication between the sample gas path and the third two-position three-way valve 101-3 is cut off at the position 0.

In one embodiment, the gas detection apparatus further comprises a chromatography booster pump 110B disposed upstream of the fifth two-position three-way valve 101-5, and when the fifth two-position three-way valve 101-5 is at the 0 position, the driving gas enters the gas chromatography column 104 along the sample gas path and is boosted.

In one embodiment, the gas detection apparatus further includes a sixth two-position three-way valve 101-6 disposed in the sample gas path, the sixth two-position three-way valve 101-6 sends the gas received from the fourth two-position three-way valve 101-4 to the gas chromatography column 104 through a first port thereof at the 1 position, the sixth two-position three-way valve 101-6 is disconnected from fluid communication with the gas chromatography column 104 at the 0 position, and a second port thereof is connected to the outside through a fourth filter 107-4, allowing the gas in the second sample tube 103 to be discharged to the outside. The sixth two-way three-way valve 101-6 is advantageous in that when the sample gas in the first sample tube 102 is detected by the ion mobility tube 109 and determined not to contain the suspected substance, the sample gas in the second sample tube 103 can be discharged through the second port of the sixth two-way three-way valve 101-6, thereby allowing the sample gas to be collected by the first sample tube 102 and the second sample tube 103 at the same time during sampling, and also allowing the sample gas in the second sample tube 103 to be discarded when further quantitative detection is not required, so that whether the detected object contains the suspected substance or not and quantitative determination of the suspected substance can be rapidly determined.

The fourth filter 107-4 can prevent external air from entering the sample gas path to cause pollution.

In one embodiment, the gas detection apparatus further comprises a second three-way 140-2 disposed between the sixth two-position three-way valve 101-6 and the gas chromatography column 104, the second three-way 140-2 connecting the sixth two-position three-way valve 101-6, the gas chromatography column 104, and the second port of the fifth two-position three-way valve 101-5. In one embodiment, when the fifth two-position three-way valve 101-5 is in the 0 position, the second three-way 140-2 is disconnected from fluid communication with the fifth two-position three-way valve 101-5, and the sixth two-position three-way valve 101-6 may be in fluid communication with the gas chromatography column 104 through the second three-way 140-2; when the sixth two-position three-way valve 101-6 is in the 0 position, the second three-way 140 is disconnected from fluid communication with the sixth two-position three-way valve 101-6, the fifth two-position three-way valve 101-5 may be in fluid communication with the gas chromatography column 104 through the second three-way 140-2, and a portion of the gas may circulate through the gas chromatography column 104, the ion transfer tube 109, the chromatography booster pump, and the fifth two-position three-way valve 101-5.

After a part of gas in the internal circulation gas path is discharged from the second buffer cavity 102B, a part of gas enters the first sample injection gas path branch 1, for example, the left part as shown in fig. 1, and returns to the first two-position three-way valve 101-1 through the sample injection gas path branch 1; at this time, if the first two-position three-way valve 101-1 is at the 0 position and the second two-position three-way valve 101-2 is at the 0 position, the gas circulates in the sample gas path. After a part of the gas in the internal circulation gas path is discharged from the second buffer cavity 102B, another part of the gas enters the second sample gas path branch 2, for example, the right part as shown in fig. 1, and returns to the fifth two-position three-way valve 101-5 through the sample gas path branch 2; at this time, if the fifth two-position three-way valve 101-5 is at the 0 position and the sixth two-position three-way valve 101-6 is at the 0 position, the gas circulates in the sample gas path.

In one embodiment of the present disclosure, the gas phase detection apparatus further comprises an online internal calibration gas circuit comprising a calibrant container 113 providing a calibrant and a calibration solenoid valve 112 connecting the calibrant container to the sample gas circuit, the calibration solenoid valve being configured to provide a trace amount of the calibrant into the sample gas circuit by an on-off operation during detection of the gas phase detection apparatus. The present embodiment is advantageous in that the online internal calibration gas path allows the online real-time calibration of the gas phase detection apparatus, thereby ensuring the accuracy of the gas phase detection apparatus.

The gas phase detection apparatus of the present disclosure may be operated in a variety of modes. In one embodiment, the gas phase detection apparatus may be operated in a first detection mode, the sampling head 20 is close to the object to be detected, the first two-position three-way valve 101-1 and the second two-position three-way valve 101-2 are at position 1, and the sample gas is collected by the sampling head 20 and enters the first sample tube 102; then, the first two-position three-way valve 101-1 and the second two-position three-way valve 101-2 are switched to the 0 position, and the gas in the sample injection gas path drives the sample gas in the first sample tube 102 to enter the ion transfer tube 109 for detection.

In one embodiment, the gas phase detection apparatus may be operated in the second detection mode, the sampling head 20 is close to the object to be detected, the third two-position three-way valve 101-3 and the fourth two-position three-way valve 101-4 are at position 1, and the sample gas is collected by the sampling head 20 and enters the second sample tube 103; then the third two-position three-way valve 101-3 and the fourth two-position three-way valve 101-4 are switched to the 0 position, and the gas in the sample gas path drives the sample gas in the second sample tube 103 to enter the gas chromatographic column 104, and then enters the ion mobility tube 109 for detection.

In one embodiment, the gas phase detection apparatus may be operated in a third detection mode, the sampling head 20 is close to the object to be detected, the first two-position three-way valve 101-1, the second two-position three-way valve 101-2, the third two-position three-way valve 101-3 and the fourth two-position three-way valve 101-4 are at position 1, and the sample gas is collected by the sampling head 20 and enters the first sample tube 102 and the second sample tube 103 respectively; and then the first two-position three-way valve 101-1, the second two-position three-way valve 101-2, the third two-position three-way valve 101-3 and the fourth two-position three-way valve 101-4 are switched to the 0 position, gas in the sample gas path respectively drives the first sample tube 102 to enter the ion mobility tube 109 for detection, and drives the sample gas in the second sample tube 103 to enter the gas chromatographic column 104 and then enters the ion mobility tube 109 for detection.

In one embodiment, the gas phase detection apparatus is configured to compare the detection result of the sample gas in the first sample tube with the detection result of the sample gas in the second sample tube. This is advantageous in that the reliability of the detection result can be improved.

The gas phase detection device provided by the present disclosure may allow the ion mobility spectrometer to be implemented to detect the detected object alone, for example, the first sample tube 102 is used to collect a sample, and to rapidly perform qualitative detection to determine whether the detected object contains contraband; the gas chromatograph-ion mobility spectrometer can also be used for detecting the detected target, so that more complex mixed components are detected, the exact property and concentration of the detected target are judged, and high-accuracy detection is realized; the ion mobility tube 109 can be used for qualitative detection, and whether the gas chromatograph-ion mobility spectrometer detection is carried out for confirmation or not can be automatically judged according to a qualitative result, so that the detection time of the non-suspected detected object is saved; quantitative detection can be realized, and the fast switching of different detection states can be realized through the switching of the three-way valve, so that the effect of fast detection is obtained.

The present disclosure also provides a sniffing device, including the above-mentioned gas phase detection device. The sniffing device may further comprise peripheral components such as a housing and electrical components.

It will be appreciated by those skilled in the art that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle.

Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of embodiments of the invention and should not be construed as limiting the invention.

It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude a plurality; "Upper" and "lower" are used merely to indicate the orientation of components in the illustrated structure, and do not limit the absolute orientation thereof; "first" and "second" are used to distinguish names of different components rather than to rank or indicate importance or primary and secondary, respectively. Additionally, any element numbers of the claims should not be construed as limiting the scope of the disclosure.

Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the appended claims and their equivalents.