WO2021238951A1 - Gas phase detection device - Google Patents

Abstract

A gas phase detection device. The gas phase detection device comprises: a sampling gas circuit including a sampling head (20) for collecting sample gas and first and second sample tubes (102, 103) for storing the collected sample gas; an ion transfer tube (109); a sample introduction gas circuit which is in fluid communication with the sampling gas circuit, the ion transfer tube (109) and a gas chromatographic column (104); and a valve assembly configured to allow sample gas to be introduced into the first and second sample tubes (102, 103) in a sampling state, and allow the sample gas to be introduced from the first and second sample tubes (102, 103) into the ion migration tube (109) and/or the gas chromatographic column (104) in a sample introduction state.

Description

Gas phase detection device

Cross-references to related applications

This application claims the rights and interests of a Chinese patent application with an application number of 202010479092.1 filed with the Chinese Patent Office on May 29, 2020, and the entire disclosure of the application is incorporated herein by reference.

Technical field

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

Background technique

Ion mobility spectroscopy technology is a detection technology under atmospheric pressure. It has the characteristics of sensitivity and rapid response. It can complete the detection and identification of simple chemical components in a very short time. Mainly used for the detection of drugs and explosives. Gas chromatograph is currently a generally recognized high-efficiency and high-stability separation tool, and it has a wide range of applications in the separation and analysis of gas phase substances and quantitative detection.

Combining gas chromatography technology with ion mobility spectroscopy technology (GC-IMS) can not only realize the separation and analysis of mixed complex chemical components, but also detect and determine the content of each component, which is very suitable for toxic and harmful gases and mixed explosives in complex environments , Drugs and other prohibited items.

The existing detection technology has insufficient resolution capability for complex components or long detection time, which makes it difficult to take into account the complex detection environment on site and the rapid and accurate detection requirements of complex inspected targets, and it is also difficult to achieve the requirements for quantitative detection.

Summary of the invention

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

The sampling gas circuit includes a sampling head for collecting sample gas, and a first sample tube and a second sample tube respectively connected with the sampling head for storing the collected sample gas;

The ion transfer tube may, for example, be used to detect the composition of the sample gas, and may include, for example, a sample inlet for sample gas and carrier gas, a gas outlet for gas to flow out, and a migration gas inlet for migrating gas to flow in;

The sample gas path is fluidly connected to the sample gas path and the ion transfer tube, so that the sample gas stored in the first sample tube and/or the second sample tube is introduced into the ion transfer tube; and

The valve assembly is configured to allow the sample gas to be introduced into the first sample tube and/or the second sample tube in the sampling state, and to allow the sample gas to flow from the first sample tube and/or the second sample tube in the sampling state. The sample tube is introduced into the ion transfer tube.

In an embodiment, the gas phase detection device further includes a gas chromatography column arranged upstream of the ion transfer tube in the sample gas path in the intake direction, so that the sample gas from the second sample tube can be first After passing through the gas chromatography column, it is sent to the ion transfer tube.

In one embodiment, the valve assembly includes a first two-position three-way valve and a second two-position three-way valve, and the first sample tube is arranged between the first two-position three-way valve and the second two-position three-way valve. When the first two-position three-way valve is in position 1, the first sample tube is in fluid communication with the sampling head through the first port of the first two-position three-way valve, and when the second two-position three-way valve is in position 1, The first sample tube discharges gas through the first port of the second two-position three-way valve; 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 arranged between the third two-position three-way valve and the fourth two-position three-way valve. When the two-position three-way valve is in position 1, the second sample tube is in fluid communication with the sampling head through the first port of the third two-position three-way valve. When the fourth two-position three-way valve is in position 1, the second sample tube passes through the fourth second The first port of the 3-way valve discharges gas.

In one embodiment, the valve assembly includes a first two-position three-way valve and a second two-position three-way valve, and the first sample tube is arranged between the first two-position three-way valve and the second two-position three-way valve. When the first two-position three-way valve is in the 0 position, the first sample tube is in fluid communication with the sampling gas path through the second port of the first two-position three-way valve so as to receive the gas from the sampling gas path. When the two-position three-way valve is in the 0 position, the first sample tube is in fluid communication with the sample gas path through the second port of the second two-position three-way valve to send sample gas into the sample gas path; 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 arranged between the third two-position three-way valve and the fourth two-position three-way valve. When the position three-way valve is at position 0, the second sample tube is in fluid communication with the sample gas path through the second port of the third two-position three-way valve to receive gas from the sample gas path. In the fourth position, the three-way valve is at 0. When in position, the second sample tube is in fluid communication with the sample gas path through the second port of the fourth two-position three-way valve to send the sample gas into the sample gas path.

In one embodiment, the sampling inlet of the ion transfer tube includes a first sampling inlet, and the sampling gas path sends sample gas from the second two-position three-way valve into the first sampling inlet of the ion transfer tube, So as to carry out the detection through the ion transfer tube; and

The sampling inlet of the ion transfer tube also includes a second sampling inlet. The sampling gas path sends the sample gas from the fourth two-position three-way valve into the gas chromatography column, and then the sample gas is discharged from the gas chromatography column. The second sampling inlet is introduced into the second sampling inlet through the sampling gas path and enters the ion transfer tube for detection.

In one embodiment, the gas phase detection device further includes a fifth two-position three-way valve, when in position 1, the first port of the fifth two-position three-way valve is in fluid communication with the second port of the third two-position three-way valve, The gas from the ion transfer tube flows through the fifth two-position three-way valve to the second port of the third two-position three-way valve, and disconnects the fluid communication between the injection gas path and the third two-position three-way valve at the 0 position .

In one embodiment, the gas phase detection device further includes a sixth two-position three-way valve, which is arranged in the sample gas path, and when the sixth two-position three-way valve is in the first position, the fourth two-position three-way valve is received from the fourth two-position three-way valve The gas will be sent to the gas chromatographic column through its first port. When the sixth two-position three-way valve is at the 0 position, the gas path to the gas chromatographic column will be disconnected, and the gas will be discharged to the outside through its second port fluid communication filter. .

In one embodiment, the gas phase detection device further includes a second three-way, arranged between the sixth two-position three-way valve and the gas chromatography column, the second three-way is connected to the first port of the sixth two-position three-way valve and the gas phase The second port of the chromatographic column and the fifth two-position three-way valve.

In one embodiment, the gas phase detection device further includes a chromatographic booster pump, which is arranged upstream of the fifth two-position three-way valve. When the fifth two-position three-way valve is at the 0 position, the driving gas enters along the sampling gas path. The gas chromatography column is pressurized.

In one embodiment, the sampling gas path further includes a sampling pump and a seventh two-position three-way valve. The sampling pump is connected to the seventh two-position three-way valve. The second two-position three-way valve is connected so that the seventh two-position three-way valve is at position 0, allowing the first sample tube and/or the second sample tube to fluidly communicate with the sampling pump, which can drive the sampling head to draw samples to the first Sample tube and/or second sample tube.

In one embodiment, the valve assembly includes a first filter configured to filter the gas flowing through the first filter, and allow the gas to pass through the first filter into the sampling gas path, so that the sampling pump can be driven back through the first filter The filtered gas flows into the first sample tube and/or the second sample tube through the seventh two-position three-way valve, and then is discharged from the sampling head.

In one embodiment, the gas phase detection device further includes an online internal calibration gas circuit. The online internal calibration gas circuit includes a calibrator container that provides a calibrator and a calibration solenoid valve that connects the calibrator container to the sample gas circuit. The valve is configured to provide a trace amount of calibrator to the sampling gas path through an on-off operation during the detection process of the gas-phase detection device.

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

At least a part of the gas discharged from the gas outlet of the ion transfer tube is sent back to the second port of the first two-position three-way valve by the first sample gas branch of the sample gas circuit and/or is received by the sample gas The second sampling gas path branch of the road is sent back to the second port of the third two-position three-way valve.

In one embodiment, the internal circulation gas path includes a first buffer chamber, a second buffer chamber, and a circulation-driven pump arranged between the first buffer chamber and the second buffer chamber. The first buffer chamber receives the gas discharged from the ion transfer tube. Gas and absorb the vibration caused by the gas. The gas discharged from the first buffer chamber flows to the second buffer chamber under the action of the circulating drive pump. A part of the gas discharged from the second buffer chamber circulates in the internal circulating gas path as the migration gas of the ion transfer tube. The other part enters the sample 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 in the 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 position 1, and the sample gas is collected through the sampling head and enters the first position. Quality control; then the first two-position three-way valve and the second two-position three-way valve are switched to the 0 position, and the gas in the sampling gas path drives the sample gas in the first sample tube into the ion transfer tube for detection; or

Operate in the second detection mode, the sampling head is close to the tested target, the third two-position three-way valve and the fourth two-position three-way valve are in position 1, the sample gas is collected through the sampling head and enters the second sample tube; then the third The two-position three-way valve and the fourth two-position three-way valve are switched to position 0, and the gas in the sample gas path drives the sample gas in the second sample tube into the gas chromatographic column, and then enters the ion transfer tube for detection; or

The operation is in the third detection mode, the sampling head is close to the tested 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 first position, the sample The gas is collected through the sampling head and enters the first sample tube and the second sample tube respectively; then the first two-position three-way valve and the second two-position three-way valve are switched to the 0 position, and the gas in the sampling gas path drives the first The sample gas of the sample tube enters the ion transfer tube for detection to determine whether the sample gas contains suspicious substances. If the sample gas of the first sample tube is detected by the ion transfer tube as containing no suspicious 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 to discharge the sample gas from the second sample tube; or

Operate in the fourth detection mode. If the sample gas in the first sample tube is detected as containing suspected substances by the ion transfer tube, the sixth two-position three-way valve is switched to position 1, so that the sample gas from the second sample tube is Drive into the gas chromatography column, and then into the ion transfer tube, from the implementation of quantitative detection.

In one embodiment, the gas phase detection device is configured to present the detection results on the same spectrum based on the detection of the sample gas by the ion transfer tube and the detection time difference between the gas chromatography column and the ion transfer tube to comprehensively determine the detection results.

In one embodiment, the gas phase detection device 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, including the above-mentioned gas phase detection device.

Description of the drawings

Fig. 1 is a schematic diagram of a gas phase detection device according to an embodiment of the present disclosure.

Detailed ways

Although the present disclosure allows various modifications and alternative forms, its specific embodiments are shown in the drawings by way of example, and will be described in detail herein. However, it should be understood that the accompanying drawings and detailed description are not intended to limit the present disclosure to the specific forms disclosed, but on the contrary, are intended to cover falling within the spirit and scope of the present disclosure defined by the appended claims All modifications, equivalents and substitutions of. The drawings are for illustration and are not drawn to scale.

The embodiment of the present disclosure provides a gas phase detection device. As shown in the figure, the upper part of FIG. 1 can be roughly regarded as the gas path part for sampling, and the ion transfer tube 109 and the gas chromatography column 104 at the lower part can be regarded as the detection device. Part, there is also a gas path used to connect the gas path part used for sampling and the part used for detection. However, the gas-phase detection device can be divided in other ways, and this is only for the purpose of illustrating one way of dividing.

In one embodiment, the gas phase detection device includes a sampling gas path, including a sampling head 20 for collecting sample gas, and a first sample tube 102 and a second sample tube 102 and a second sample tube respectively connected to the sampling head for storing the sample gas collected by the sampling head. Sample tube 103; ion transfer tube 109, used for detecting sample gas; sample gas path, fluidly connecting the sampling gas path and ion transfer tube, so that the sample stored in the first sample tube 102 and/or the second sample tube 103 The gas is respectively introduced into the downstream ion transfer tube; and a valve assembly configured to allow the introduction of sample gas into the first sample tube 102 and/or the second sample tube 103 in the sampling state, and permit the introduction of the sample gas into the first sample tube 102 and/or the second sample tube 103 in the sampling state The sample gas is introduced from the first sample tube 102 and/or the second sample tube 103 to the ion transfer tube.

The gas path portion for sampling in the upper part of FIG. 1 may include a sampling head 20 for collecting sample gas and a first sample tube 102 and/or a second sample connected to the sampling head for storing the collected sample gas. Pipe 103. In the embodiment shown in Fig. 1, the sampling gas path includes a first sample tube 102 and a second sample tube 103, which can be used to store a quantitative sample gas, respectively. The present disclosure is advantageous to use two sample tubes for storing quantitative sample gas, which can use two sample tubes to collect sample gas at the same time, so that the difference in composition of the sample gas collected by the two sample tubes can be minimized, even basically There is no difference, and it is allowed to provide sample gas of the same composition at the same time or time-sharing for different tests, or to provide sample gas of only one sample tube, which greatly facilitates the detection operation and improves the adaptability, efficiency and reliability of the measurement.

The sampling gas circuit also includes 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 the first sample tube 102 is arranged on the first two-position three-way valve 101-1 And the second two-position three-way valve 101-2 between the two. When the first two-position three-way valve 101-1 is in position 1, the first sample tube 102 is in fluid communication with the sampling head 20 through the first port of the first two-position three-way valve 101-1, and in the second two-position three-way When the valve 101-2 is in the 1 position, the first sample tube 102 discharges gas through the first port of the second two-position three-way valve 101-2; when the second two-position three-way valve 101-2 is in the 0 position, the first is the same The quality pipe 102 is in fluid communication with the sample gas path through the second port of the second two-position three-way valve 101-2 to send sample gas into the sample gas path; in the first two-position three-way valve 101-1 is at position 0 At this time, the first sample tube 102 is in fluid communication with the sampling gas path through the second port of the first two-position three-way valve 101-1 so as to receive gas from the sampling gas path. During operation, the first two-position three-way valve 101-1 is in position 1, and the sample gas enters the first sample tube 102, the sample gas can be temporarily stored in the first sample tube 102. Of course, in actual operation, this This kind of preservation process is very short. The sample gas is quickly entered into the sample 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 as the first two-position three-way valve 101- 1 and the second two-position three-way valve 101-2 are switched to position 0, the sampling gas path and the sampling gas path form a loop, and the sample gas is sent to the downstream ion transfer tube for detection.

The valve assembly includes 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 at the third two-position three-way valve 101-3 and the fourth two-position three-way valve 101-3. 101-4 between the two. When the third two-position three-way valve 101-3 is in position 1, 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 in the fourth two-position three-way valve When 101-4 is in position 1, 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 in position 0, the second sample tube 103 The second port of the third two-position three-way valve 101-3 is in fluid communication with the sample gas path to receive gas from the sample gas path. When the fourth two-position three-way valve 101-4 is at position 0, 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 to send sample gas into the sample gas path. During operation, the third two-position three-way valve 101-3 is in position 1, and the sample gas enters the second sample tube 103, the sample gas can be temporarily stored in the second sample tube 103, but it should be known that this storage is extremely short-lived The gas phase detection device can also be operated 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 for detection or exhaust. The above embodiment can realize the first sample tube 102 and the second sample tube 103 to sample separately. For example, in one case, the sample head 20 is close to the object to be inspected, the first two-position three-way valve 101-1 is at position 1, and the third two-position three-way valve 101-3 is at position 0, and the sample gas only enters the first position. In the sample tube 1002. In another case, the sample head 20 is close to the object to be inspected, the first two-position three-way valve 101-1 is at position 0, and the third two-position three-way valve 101-3 is at position 1, 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 in 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 later use. Of course, in actual operation, the preservation process is extremely short, and the sample gas is quickly passed through the second two-position three-way valve 101-2 and The second port of the fourth two-position three-way valve 101-4 enters the sampling gas path.

The embodiment of the present disclosure uses multiple two-position three-way valves combined with two sample tube configurations to realize the function of collecting, for example, quantitative sample gas through the switching of valve components (for example, rapid switching of the valve to achieve pulse sampling). The amount can be determined by the volume of the sample tube, so that the sampling action is fast and accurate. Generally, the volume of the sample tube is in the order of milliliter, such as one milliliter, 0.5 milliliter or other volumes, and each sample is automatically collected, for example, a determined one milliliter, 0.5 milliliter or other volume of sample gas.

The sampling gas circuit also includes a sampling pump 110C and a seventh two-position three-way valve 101-7. The sampling pump 110C is connected to the seventh two-position three-way valve 101-7, and the seventh two-position three-way valve 101-7 passes through the first three-way valve 101-7. The port 140-1 is connected to the first and second two-position three-way valves 101-1, 101-2 respectively, so that when the seventh two-position three-way valve 101-7 is in the 0 position, the first sample tube 102 and/ Or, the second sample tube 103 is in fluid communication with the sampling pump 110C, and the sampling pump 110C can drive the sampling head 20 to extract samples from the subject to the first sample tube 102 and/or the second sample tube 103.

In a sampling state, when the first and second two-position three-way valves 101-1 and 101-2 are connected at position 1, and the seventh two-position three-way valve 101-7 is at position 0, the sampling pump 110C is driven The sampling head 20 sucks the sample gas, and the sample gas enters the first sample tube 102; then the first and second two-position three-way valves 101-1 and 101-2 are connected to the 0 position, the sample is sucked, and the sample gas It is stored in the first sample tube 102 so as to realize individual sampling of the first sample tube 102.

In another sampling state, when the third and fourth two-position three-way valves 101-3 and 101-4 are connected at position 1, and the seventh two-position three-way valve 101-7 is at position 0, the sampling pump 110C The sampling head 20 is driven to suck sample gas, and the sample gas enters the second sample tube 103; then the third and fourth two-position three-way valves 101-3, 101-4 are connected to position 0, the sample gas is sucked, and the sample gas It is stored in the second sample tube 103 so as to realize the separate sampling of the second sample tube 103.

In another sampling state, the first and second two-position three-way valves 101-1 and 101-2 are connected in position 1, and the third and fourth two-position three-way valves 101-3 and 101-4 are connected in position 1. Position, the seventh two-position three-way valve 101-7 is at position 0, the sampling pump 110C drives the sampling head 20 to suck sample gas, and the sample gas enters the first sample tube 102 and the second sample tube 103; Two-way three-way valves 101-1 and 101-2 are connected and switched to position 0, while the third and fourth two-position three-way valves 101-3 and 101-4 are connected and switched to position 0. The sample is drawn and the sample gas is drawn. It is stored in the first sample tube 102 and the second sample tube 103, thereby realizing simultaneous sampling of the two sample tubes.

It can be seen from the above that the gas-phase detection device of the present disclosure can realize the separate sampling and storage of the first sample tube 102 and the second sample tube 103, and can also realize the simultaneous sampling and storage, thereby making the gas-phase detection device more versatile. .

The gas phase detection device includes a first filter 107-1 configured to filter the gas flowing through the first filter 107-1. As shown in the figure, the first filter 107-1 is connected to the external environment, which allows the sampling pump 110C to suck 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 cleaned with gas. As shown in Figure 1, the sampling pump 110C extracts 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 through the sampling pump 110C. At this time, the seventh two-position three-way valve 101-7 is at position 0, and the filtered gas then enters the first sample tube 102 and/or the second sample tube 103, and is finally 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. It can collect sample gas and store it in either or both of the two sample tubes. It also allows the sampling gas circuit (including the first sample tube 102, The second sample tube 103 and the sampling head 20) are cleaned to realize a compact gas path.

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

The ion transfer tube 109 may include sampling inlets 109A-1, 109B-1 for sample gas and carrier gas, gas outlets 109A-2, 109B-2 for gas to flow out, and migration gas inlet 109A-3 for migration gas to flow in. , 109B-3.

As shown in FIG. 1, the sampling inlet of the ion transfer tube 109 includes a first sampling inlet 109A-1, and the sampling gas path sends the sample gas from the second two-position three-way valve 101-2 into the ion transfer tube The first sampling inlet 109A-1 of 109 enters the ion transfer tube 109 and passes through the ion transfer tube 109 to perform detection, for example, to determine the composition of the sample gas. The sampling inlet of the ion transfer tube 109 also includes a second sampling inlet 109B-1, and the sampling gas path first sends the sample gas from the fourth two-position three-way valve 101-4 into the gas chromatography column 104, Subsequently, the sample gas is discharged from the gas chromatographic column 104, introduced into the second sample inlet 109B-1 through the sample gas path, and enters the ion transfer tube 109 for detection. The sample gas first passes through the gas chromatographic column 104 to realize the separation of the sample gas. The gas substances of different components pass through the gas chromatographic column 104 for different times. The time for each component of the gas to pass through the gas chromatographic column 104 can be called the gas The retention time in the gas chromatography column 104, the gas of each component then enters the ion transfer tube, and the corresponding spectral peak is detected. The value of the peak changes with the concentration of the gas of the component. The gas of the component can be determined by integration. Concentration, combined with a fixed-volume sample tube, can get the gas content of the component.

The sample gas in the first sample tube 102 and the second sample tube 103 are respectively introduced into the ion transfer tube 109 through their respective gas paths (may be referred to as the sample injection gas path branch) to achieve separate detection, and avoid the sample gas Interfere with each other.

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

The gas phase detection device of the present disclosure can determine whether to further implement the gas chromatography column 104-ion transfer tube 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 transfer tube 109 109 quantitative detection, comprehensively determine the detection results.

The embodiments of the present disclosure can meet the requirements of using the first sample tube 102 and the second sample tube 103 to sample at the same time, and then qualitatively detect the sample gas of the first sample tube 102 through the ion transfer tube 109. If the sample gas contains suspicious substances, Then, the sample gas in the second sample tube 103 is sent to the gas chromatographic column 104-ion transfer tube 109 for quantitative detection, and the contents of the samples of various components are obtained. If there is no suspect substance in the sample gas, the sample gas in the second sample tube 103 is discharged. This is advantageous. On the one hand, due to the dual sample tube sampling, sample gases with basically the same composition can be collected at the same time; on the other hand, simple and rapid qualitative inspections can be carried out first, when it is determined that there are no suspected substances. , The gas in the second sample tube can be directly discharged. If it is determined that the sample gas contains a suspect substance, a quantitative inspection will be carried out according to the situation. After the sample gas is collected, the inspected item can leave the collection area, making the collection efficiency high, even if the qualitative inspection It is determined that the sample gas contains the suspected substance, and there is no need for the inspected article to return to the collection area again, only the sample gas in the second sample tube needs to be quantitatively measured.

The gas phase detection device of the present disclosure includes a sampling gas path, which fluidly communicates with the sampling gas path, the ion transfer tube 109, and the gas chromatography column 104, so that the quantitative data stored in the first sample tube 102 and/or the second sample tube 103 The sample gas is introduced into the ion transfer tube 109 and/or the gas chromatography column 104.

In the embodiment shown in FIG. 1, the gas phase detection device further includes an internal circulation gas path, so that at least a part of the gas discharged from the gas outlet of the ion migration tube 109 is returned to the migration gas of the ion migration tube 109 by the internal circulation gas path. Inlet; at least a part of the gas discharged from the gas outlet of the ion migration tube 109 is sent back to the second port of the first two-position three-way valve 101-1 and/or the third two-position three-way valve 101- by the sample gas path 3 second port. The internal circulation gas path includes a circulation drive pump, for example, a diaphragm pump, which can drive gas to circulate in the internal circulation gas path. In order to avoid vibration, the internal circulation gas path includes a first buffer chamber 102A and a second buffer chamber 102B, and the circulating driving pump is arranged between the first buffer chamber 102A and the second buffer chamber 102B. The first buffer chamber 102A receives the gas discharged from the ion transfer tube 109 and absorbs the vibration of the gas. The gas discharged from the first buffer chamber 102A flows to the second buffer chamber 102B under the action of the circulating drive pump, and the second buffer chamber 102B absorbs the gas Vibrating, a part of the gas discharged from the second buffer chamber 102B is circulated as the migration gas of the ion migration tube 109 in the internal circulation gas path, and the other part enters the sampling gas path. The first and second buffer chambers 102A and 102B can reduce the influence of the pulsed air flow on the air flow in the ion mobility spectrometer, and at the same time reduce the influence of the pulsed air flow on the gas chromatography column 104.

The internal circulation gas path also includes a flow control valve 106, which is arranged between the ion transfer tube 109 and the first buffer chamber 102A, so that the user can choose according to the electrophilic or nucleophilic properties of the test sample or cut off the non-corresponding detection mode. Simultaneous detection is performed only in the negative mode, only in the positive mode, or in the negative and positive modes, thereby improving the selective detection of the sample by the instrument. In the embodiment shown in FIG. 1, the first ion migration tube 109 and the second ion migration tube 109 of the dual-mode ion migration tube 109 are respectively connected to a flow control valve 106.

The internal circulation gas path also includes a second filter 107-2 arranged between the first buffer chamber 102A and the second buffer chamber 102B. The second filter 107-2 can filter the gas discharged from the first buffer chamber 102A. The filtered gas enters the second buffer chamber 102B, thereby avoiding re-installing a purification filter on the circulating gas path, thereby saving manufacturing costs. It should be noted that those skilled in the art should understand that in some other embodiments of the present disclosure, the second filter 107-2 may also be arranged at other positions of the sample gas path, such as the first buffer chamber 102A and Between the gas outlets of the ion transfer tube 109.

The internal circulation gas circuit also includes a gas supplement/deflation gas circuit for supplying gas into the ion migration tube 109 or degassing the ion migration tube 109. The first port of the gas supplement/deflation gas circuit is connected to the gas outlet of the ion migration tube 109. , The second port of the air supplement/deflation air circuit is in communication with the external environment. By setting the gas supply/deflation gas circuit, the ion migration tube 109 can automatically supply gas and exhaust gas according to changes in the environment, micro-sampling, and the temperature of the ion migration tube 109, thereby realizing rapid sampling.

In one embodiment, a third filter 107-3 is provided on the supplemental gas/deflated gas path to purify the gas flowing through the supplementary gas/deflated gas path, so as to reduce the influence of the outside on the ion mobility spectrometer, and It can increase the service life of gas purifiers (molecular sieve, activated carbon, etc.).

The internal circulation gas path further includes a three-way valve 105, which is arranged between the circulation drive pump and the filter, and the first port of the supplementary air/discharge gas path is communicated with the internal circulation gas path through the three-way valve 105. The three-way valve 105 is configured to only allow gas to flow from the circulation-driven pump to the second filter 107-2 in the sampling state, and not from the three-way valve 105 to the outside; in the deflated state, only gas is allowed to flow from the circulation-driven pump It flows to the external environment, but does not flow to the second filter 107-2; in the supplemental state, the external air is allowed to flow to the second filter 107-2. Through the above-mentioned three-way valve 105, the sample injection gas path, the supplement gas path and the degas path can be selectively connected.

A water trap filter 108 is also provided on the air supplement/bleed air path, and the water trap filter 108 is located between the third purification filter 107-3 and the external environment 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. This part of the gas can flow from the two flow paths to the first ion transfer tube 109 and the first ion transfer tube 109, respectively. Two ion migration tube 109. Further, a flow regulator may be provided to adjust the flow rate of the gas flowing to the first ion transfer tube 109 and the second ion transfer tube 109. The flow regulator may be provided between the second buffer chamber 102B and the ion transfer tube 109.

It is advantageous for the gas phase detection device to include an internal circulation gas circuit, which allows the circulating drive pump to keep working, and the gas is circulated in the internal circulation gas circuit, so that the sample in the first sample tube 102 and/or the second sample tube 103 can be transferred in real time. The gas is sent to the ion transfer tube 109 and the gas chromatography column 104; and because of the filter, the gas in the sample gas path can be kept clean; the gas path of the sample gas can be maintained because of the gas supplement/bleed gas path The medium gas pressure is the set value.

In one embodiment, the gas phase detection device further includes a fifth two-position three-way valve 101-5. When it is in position 1, the first port is in communication with the second port of the third two-position three-way valve 101-3. At this time, the fluid communication between the sampling gas path and the third two-position three-way valve 101-3 is disconnected.

In one embodiment, the gas phase detection device further includes a chromatography booster pump 110B, which is arranged upstream of the fifth two-position three-way valve 101-5. When the fifth two-position three-way valve 101-5 is at the 0 position, the driving gas It enters the gas chromatographic column 104 along the sample gas path and pressurizes it.

In one embodiment, the gas phase detection device further includes a sixth two-position three-way valve 101-6, which is arranged in the sample gas path, and the sixth two-position three-way valve 101-6 passes through its first position when it is in position 1. The port sends the gas received from the fourth two-position three-way valve 101-4 into the gas chromatographic column 104. At the 0 position, the sixth two-position three-way valve 101-6 is disconnected from the fluid communication with the gas chromatography column 104. The two ports are connected to the outside through the fourth filter 107-4, allowing the gas in the second sample tube 103 to be discharged to the outside. The setting of the sixth two-position three-way valve 101-6 is advantageous. When the sample gas in the first sample tube 102 is detected by the ion transfer tube 109 to determine that it does not contain any suspicious substances, the sample gas in the second sample tube 103 It can be discharged through the second port of the sixth two-position three-way valve 101-6, which allows the first sample tube 102 and the second sample tube 103 to collect sample gas at the same time during sampling, and also allows when further quantitative detection is not required , Abandoning the sample gas in the second sample tube 103 can quickly determine whether the inspected article contains a suspicious substance and quantitatively determine the suspicious substance.

The fourth filter 107-4 can prevent pollution caused by external air entering the sample gas path.

In one embodiment, the gas detection device further includes a second three-way 140-2, which is arranged between the sixth two-position three-way valve 101-6 and the gas chromatography column 104, and the second three-way 140-2 is connected to the second three-way valve. The second port of the third-position three-way valve 101-6, the gas chromatography column 104, and the fifth two-position three-way valve 101-5. In one embodiment, when the fifth two-position three-way valve 101-5 is in position 1, the fluid communication between the second three-way 140-2 and the fifth two-position three-way valve 101-5 is disconnected, and the sixth and second three-way valve The three-way valve 101-6 can be in fluid communication with the gas chromatographic column 104 through the second three-way 140-2; when the three-way valve 101-6 is at the 0 position, the second three-way 140 is connected to the second three-way 140-2. The fluid communication of the three-way valve 101-6 is disconnected, the fifth two-position three-way valve 101-5 can be in fluid communication with the gas chromatography column 104 through the second three-way 140-2, and a part of the gas can be in the gas chromatography column 104, The ion migration tube 109, the chromatography booster pump, and the fifth two-position three-way valve 101-5 circulate.

After a part of the gas in the internal circulation gas path is discharged from the second buffer chamber 102B, a part enters the first sampling gas path branch 1, such as the left part as shown in FIG. One-two-position three-way valve 101-1; at this time, if the first two-position three-way valve 101-1 is at position 0 and the second two-position three-way valve 101-2 is at position 0, the gas is in the sample gas path cycle. After a part of the gas in the internal circulation gas path is discharged from the second buffer chamber 102B, a part of it enters the second sampling gas path branch 2, for example, the right part as shown in FIG. The fifth two-position three-way valve 101-5; 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 is in the sampling gas path In the loop.

In an embodiment of the present disclosure, the gas phase detection device further includes an online internal calibration gas circuit, including a calibrator container 113 that provides a calibrator and a calibration solenoid valve 112 that connects the calibrator container to the sample gas path. The valve is configured to provide a trace amount of calibrator to the sampling gas path through an on-off operation during the detection process of the gas-phase detection device. This embodiment is advantageous. The online internal calibration gas path allows the gas phase detection device to be calibrated online in real time, so the accuracy of the gas phase detection device can be ensured.

The gas phase detection device in the present disclosure can be operated in a variety of modes. In one embodiment, the gas phase detection device can be operated in the first detection mode, the sampling head 20 is close to the object to be inspected, the first two-position three-way valve 101-1 and the second two-position three-way valve 101-2 are in position 1, The sample gas is collected through 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 position 0, and the gas in the gas path is sampled The sample gas in the first sample tube 102 is driven into the ion transfer tube 109 for detection.

In one embodiment, the gas phase detection device can be operated in the second detection mode, the sampling head 20 is close to the detected target, the third two-position three-way valve 101-3 and the fourth two-position three-way valve 101-4 are in the first position, The sample gas is collected through 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 switch to position 0, and the gas in the sampling gas path drives The sample gas in the second sample tube 103 enters the gas chromatography column 104, and then enters the ion transfer tube 109 for detection.

In one embodiment, the gas phase detection device can be operated in the third detection mode, the sampling head 20 is close to the object to be inspected, the first two-position three-way valve 101-1, the second two-position three-way valve 101-2, and the third two-way valve The three-way valve 101-3 and the fourth two-way three-way valve 101-4 are in position 1. The sample gas is collected through the sampling head 20 and enters the first sample tube 102 and the second sample tube 103 respectively; then the first two positions The 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 position 0, and the The gas drives the first sample tube 102 into the ion transfer tube 109 for detection, and the sample gas in the second sample tube 103 enters the gas chromatography column 104, and then enters the ion transfer tube 109 for detection.

In one embodiment, the gas phase detection device 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 and can improve the reliability of the detection result.

The gas phase detection device provided by the present disclosure can allow the detection of the detected target by ion mobility spectrometer alone, for example, the first sample tube 102 is used to collect samples, and qualitative detection can be quickly made to determine whether the detected target contains prohibited items; Perform gas chromatograph-ion mobility spectrometer detection on the detected target, thereby detecting more complex mixed components, judging the exact nature and concentration of the detected target, and achieving higher accuracy detection; you can also use the ion migration tube 109 For qualitative testing, it will automatically determine whether to perform gas chromatograph-ion mobility spectrometer testing for confirmation based on the qualitative results, saving the testing time of non-suspected subjects; quantitative testing can also be achieved, and different testing states can be achieved by switching the three-way valve Quickly switch to obtain the effect of fast detection.

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

Those skilled in the art can understand that the embodiments described above are all exemplary, and those skilled in the art can improve them, and the structures described in the various embodiments do not conflict in terms of structure or principle. In the case of free combination.

Although the present disclosure has been described with reference to the accompanying drawings, the embodiments disclosed in the accompanying drawings are intended to exemplify the implementation of the present disclosure, and should not be understood as a limitation of the present disclosure.

It should be noted that the wording "comprise" does not exclude other elements or steps, and the wording "a" or "one" does not exclude a plurality; It does not limit its absolute position; "First" and "Second" are used to distinguish the names of different components, not for ranking or to indicate importance or distinction. In addition, any element reference signs in the claims should not be construed as limiting the scope of the present disclosure.

Although some embodiments of the present general inventive concept have been shown and described, those of ordinary skill in the art will understand that changes can be made to these embodiments without departing from the principles and spirit of the present general inventive concept. The scope is defined by the claims and their equivalents.

Claims (18)

1. A gas phase detection device includes:

   The sampling gas path includes a sampling head (20) for collecting sample gas and a first sample tube (102) and a second sample tube ( 103);

   Ion transfer tube (109), used to detect sample gas;

   The sample gas path is fluidly connected to the sample gas path and the ion transfer tube, so that the sample gas stored in the first sample tube (102) and/or the second sample tube (103) is respectively introduced into the downstream In the ion transfer tube; and

   The valve assembly is configured to allow the sample gas to be introduced into the first sample tube (102) and/or the second sample tube (103) in the sampling state, and to allow the sample gas to flow from the first sample in the sampling state The tube (102) and/or the second sample tube (103) are introduced into the ion transfer tube.
2. The gas phase detection device according to claim 1, further comprising a gas chromatography column (104), the gas chromatography column is arranged upstream of the ion transfer tube in the sample gas path in the direction of the gas inlet so as to come from the second The sample gas in the sample tube (103) can pass through the gas chromatography column first, and then be sent into the ion transfer tube.
3. The gas phase detection device according to claim 1, wherein:

   The valve assembly includes a first two-position three-way valve (101-1) and a second two-position three-way valve (101-2). The first sample tube (102) is arranged in the first two-position three-way valve and the Between the second two-position three-way valve, wherein when the first two-position three-way valve is in position 1, the first sample tube (102) passes through the first port of the first two-position three-way valve In fluid communication with the sampling head, when the second two-position three-way valve is in position 1, the first sample tube (102) discharges gas through the first port of the second two-position three-way valve; and

   The valve assembly includes a third two-position three-way valve (101-3) and a fourth two-position three-way valve (101-4), and a second sample tube (103) is arranged in the third two-position three-way valve and the The fourth two-position three-way valve is between the two, wherein when the third two-position three-way valve is in position 1, the second sample tube (103) passes through the first port of the third two-position three-way valve and the sample The head is in fluid communication, and the second sample tube (103) discharges gas through the first port of the fourth two-position three-way valve when the fourth two-position three-way valve is in position 1.
4. The gas phase detection device according to claim 1, wherein:

   The valve assembly includes a first two-position three-way valve (101-1) and a second two-position three-way valve (101-2). The first sample tube (102) is arranged in the first two-position three-way valve and the Between the second two-position three-way valve, wherein when the first two-position three-way valve is at the 0 position, the first sample tube (102) passes through the second port of the first two-position three-way valve In fluid communication with the sampling gas path to receive gas from the sampling gas path, when the second two-position three-way valve is at the 0 position, the first sample tube (102) passes through the second two-position three-way valve. The second port of the through valve is in fluid communication with the sampling gas path to send sample gas into the sampling gas path; and

   The valve assembly includes a third two-position three-way valve (101-3) and a fourth two-position three-way valve (101-4), and a second sample tube (103) is arranged in the third two-position three-way valve and the The fourth two-position three-way valve is between the two, wherein when the third two-position three-way valve is in the 0 position, the second sample tube (103) passes through the second port of the third two-position three-way valve and The sampling gas path is in fluid communication to receive gas from the sampling gas path, and the second sample tube (103) passes through the fourth two-position three-way valve when the fourth two-position three-way valve is at position 0 The second port is in fluid communication with the sampling gas path to send sample gas into the sampling gas path.
5. The gas phase detection device according to claim 4, wherein:

   The ion transfer tube includes a first sample inlet (109A-1), and the sample gas path sends the sample gas from the second two-position three-way valve into the first sample inlet of the ion transfer tube, thereby Perform detection through the ion transfer tube; and

   The ion transfer tube also includes a second sampling inlet (109B-1). The sampling gas path sends the sample gas from the fourth two-position three-way valve into the gas chromatography column, and then the sample gas is transferred from the gas chromatography column. The gas chromatography column is discharged, introduced into the second sampling inlet through the sampling gas path, and enters the ion transfer tube for detection.
6. The gas phase detection device according to claim 5, further comprising a fifth two-position three-way valve (101-5), the first port of the fifth two-position three-way valve and the third second The second port of the three-way valve is in fluid communication, and the gas from the ion transfer tube flows through the fifth two-way three-way valve to the second port of the third two-way three-way valve. The fluid communication between the sampling gas path and the third two-position three-way valve is disconnected.
7. The gas phase detection device according to claim 6, further comprising a sixth two-position three-way valve (101-6), which is arranged in the sampling gas path, and the sixth two-position three-way valve receives The gas from the fourth two-position three-way valve will be sent to the gas chromatography column through its first port, and the sixth two-position three-way valve shuts off the gas flow to the gas chromatography column when it is at the 0 position. Through the second port of the fluid communication filter (107-4) to exhaust the gas to the outside.
8. The gas phase detection device according to claim 7, further comprising a second three-way (140-2) arranged between the sixth two-position three-way valve and the gas chromatography column, the second three-way connection 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 phase detection device according to claim 7, further comprising a chromatography booster pump (110B), arranged upstream of the fifth two-position three-way valve, when the fifth two-position three-way valve is at the 0 position, The driving gas enters the gas chromatography column along the sampling gas path and is pressurized.
10. The gas phase detection device according to claim 3, wherein

    The sampling gas circuit also includes a sampling pump (110C) and a seventh two-position three-way valve (101-7), the sampling pump is connected to the seventh two-position three-way valve, and the seventh two-position three-way valve passes through The first three-way (140-1) is connected to the first and second two-position three-way valves, so that when the seventh two-position three-way valve is in the 0 position, the first sample tube and/ Or the second sample tube is in fluid communication with the sampling pump, and the sampling pump can drive the sampling head to draw samples to the first sample tube and/or the second sample tube.
11. The gas phase detection device according to claim 10, wherein the gas phase detection device comprises a first filter (107-1) configured to filter the gas flowing through the first filter and allow the gas to pass through the first filter The filter enters the sampling gas path, so that the sampling pump can reversely drive the gas filtered by the first filter to flow into the first sample tube and/or the first sample tube through the seventh two-position three-way valve. The second sample tube is then discharged from the sampling head.
12. The gas phase detection device according to claim 1, further comprising an on-line internal calibration gas circuit, and the calibration gas circuit inside the line includes a calibrator container (113) that provides a calibrator and connects the calibrator container to the inlet A calibration solenoid valve (112) of the sample gas circuit, the calibration solenoid valve is configured to provide a trace amount of calibrator to the sample gas circuit through an on-off operation during the detection process of the gas phase detection device.
13. The gas phase detection device according to claim 5, wherein:

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

    At least part of the gas discharged from the gas outlet of the ion transfer tube is sent back to the second port of the first two-position three-way valve by the first sampling gas path branch of the sampling gas path and/or by the second port of the first two-position three-way valve. The second sampling gas path branch of the sampling gas path is sent back to the second port of the third two-position three-way valve.
14. The gas phase detection device according to claim 12, wherein:

    The internal circulation gas path includes a first buffer chamber, a second buffer chamber, and a circulating drive pump arranged between the first buffer chamber and the second buffer chamber. The first buffer chamber receives the ion The gas discharged from the migration tube absorbs the vibration caused by the gas. The gas discharged from the first buffer chamber flows to the second buffer chamber under the action of the circulating drive pump. Part of the gas discharged from the second buffer chamber is in the second buffer chamber. The internal circulation gas path circulates as the migration gas of the ion migration tube, and the other part enters the sampling gas path.
15. The gas phase detection device according to claim 1, wherein the first sample tube and the second sample tube are configured to have a set fixed volume.
16. The gas phase detection device according to claim 5, wherein

    When operating in the first detection mode, the sampling head is close to the object to be inspected, the first two-position three-way valve and the second two-position three-way valve are in position 1, and sample gas is collected through the sampling head, Enter the first sample tube; then the first two-position three-way valve and the second two-position three-way valve are switched to the 0 position, and the gas in the sampling gas path drives the first sample The sample gas in the tube enters the ion transfer tube for detection; or

    When operating in the second detection mode, the sampling head is close to the object to be inspected, the third two-position three-way valve and the fourth two-position three-way valve are in position 1, and the sample gas is collected through the sampling head and enters The 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 sampling gas path drives the gas in the second sample tube The sample gas enters the gas chromatography column, and then enters the ion transfer tube for detection; or

    When operating in the third detection mode, the sampling head is close to the object to be inspected, the first two-position three-way valve, the second two-position three-way valve, the third two-position three-way valve, and the first two-position three-way valve The four-two-position three-way valve is in position 1. The sample gas is collected through the sampling head and enters the first sample tube and the second sample tube respectively; then the first two-position three-way valve and the second sample tube The two-two-position three-way valve is switched to position 0, and the gas in the sampling gas path drives the sample gas of the first sample tube into the ion transfer tube for detection to determine whether the sample gas contains suspected substances , If the sample gas of the first sample tube is detected by the ion transfer tube as containing no suspicious substances, the third two-position three-way valve, the fourth two-position three-way valve and the sixth The two-position three-way valve is switched to the 0 position to discharge the sample gas from the second sample tube; or

    When operating in the fourth detection mode, if the sample gas of the first sample tube is detected by the ion transfer tube as containing suspicious substances, the sixth two-position three-way valve is switched to position 1, so that the gas from the The sample gas in the second sample tube is driven into the gas chromatography column, and then into the ion transfer tube for quantitative detection.
17. The gas-phase detection device according to claim 5, configured to present the detection results on the same spectrum based on the detection of the sample gas by the ion transfer tube and the detection time difference of the gas chromatography column-ion transfer tube on the sample, and comprehensively determine Test results.
18. The gas phase detection device according to claim 16, 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.

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