WO2021128097A1

WO2021128097A1 - Vocs traceability detection device, system and method

Info

Publication number: WO2021128097A1
Application number: PCT/CN2019/128459
Authority: WO
Inventors: 谭国斌; 麦泽彬; 余志�; 吴日伟; 牛红志; 陈景鸿; 覃彬
Original assignee: 广州禾信仪器股份有限公司
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2021-07-01

Abstract

A VOCs traceability detection device, system and method. The VOCs traceability detection device comprises a detection cavity (10), a gas reversing valve (20), a gas storage device (30) and a processor (40); the processor (40) transmits a reversing signal to the gas reversing valve (20) when detecting that the volume of gas to be tested in the gas storage device (30) reaches a preset value; and the gas reversing valve (20) blocks a gas path between the detection cavity (10), the gas storage device (30) and a suction pump according to the reversing signal, and conducts a gas path between a carrier gas output port, the gas storage device (30) and a gas analysis instrument. The processor (40) receives VOCs information of each surface to be tested transmitted by the gas analysis instrument, and confirms the location of a pollution source according to the VOCs information. The traceability detection device is easy to quickly assemble, and may perform enrichment and qualitative and quantitative testing on VOCs released by flat samples without damaging the surface.

Description

VOCs traceability detection equipment, system and method

Technical field

This application relates to the technical field of VOCs traceability detection, in particular to a VOCs traceability detection equipment, system and method.

Background technique

The rapid detection and traceability of volatile organic compounds (VOCs) is an important prerequisite for the treatment of organic air pollution. In the actual indoor and outdoor testing, VOCs have a wide variety and complex sources. When there are multiple sources of mixed VOCs, it will interfere with the detection of VOCs in the range. The premise of effective control and treatment of VOCs pollution is to improve the accuracy of traceability.

In the process of implementation, the inventor found that the traditional technology has at least the following problems: the current traditional VOCs traceability detection equipment will cause damage to the sample to be tested when performing planar detection.

Summary of the invention

Based on this, it is necessary to address the above technical problems and provide a VOCs traceability detection equipment, system and method that can maintain the integrity of the sample to be tested in planar detection.

In order to achieve the foregoing objectives, on the one hand, an embodiment of the present invention provides a VOCs traceability detection device, which includes a detection chamber, a gas reversing valve, a gas storage device, and a processor;

The open surface of the detection chamber is used to cover the plane to be measured; the processor is connected to the gas reversing valve; the gas reversing valve is connected between the gas storage device and the detection chamber, and is used to connect the gas pump, the carrier gas output port and Gas analysis equipment;

When the processor detects that the volume of the gas to be measured in the gas storage device reaches a preset value, it transmits a reversing signal to the gas reversing valve;

The gas reversing valve blocks the gas path between the detection chamber, the gas storage device and the gas pump according to the reversing signal, and conducts the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument;

The processor receives the VOCs information of each plane to be measured transmitted by the gas analysis instrument, and confirms the location of the pollution source according to the VOCs information.

In one of the embodiments, the gas reversing valve includes a six-way valve;

The six-way valve includes a first passage port, a second passage port, a third passage port, a fourth passage port, a fifth passage port, and a sixth passage port that are sequentially arranged in the circumferential direction; the first passage port and the fourth passage port pass through Gas storage equipment connection; the second channel port is connected to the detection chamber; the third channel port is used to connect to the gas pump; the fifth channel port is used to connect to the carrier gas output port; the sixth channel port is used to connect to the gas analysis instrument;

Among them, the six-way valve connects the second channel port with the third channel port, connects the fourth channel port with the fifth channel port, and connects the sixth channel port with the first channel port based on the reversing signal.

In one of the embodiments, it further includes a heating device and a solenoid valve;

The input end of the solenoid valve is connected to the detection chamber, and the output end is connected to the gas reversing valve; the heating device is used to heat the gas in the detection chamber;

When the processor detects that the heating time of the heating device reaches a preset value, it sends an opening instruction to the solenoid valve; the opening instruction is used to instruct the solenoid valve to conduct the gas path between the detection cavity and the gas reversing valve.

In one of the embodiments, it further includes a seal;

The seal is used to seal the contact surface between the detection cavity and the plane to be measured.

In one of the embodiments, it further includes a vacuum chuck;

The vacuum chuck is arranged on the edge of the detection cavity.

In one of the embodiments, the gas storage device includes a quantitative loop.

In one of the embodiments, the cavity includes any one of the following shapes: a square shape, a hemispherical shape, and a pot lid shape.

On the one hand, the embodiment of the present invention also provides a VOCs traceability detection system, including a multi-port valve, a gas analysis instrument, and at least one VOCs traceability detection device according to any one of claims 1 to 7;

Each processor is connected to a multi-way valve; each gas reversing valve is connected to a gas analysis instrument through a multi-way valve;

When any processor receives the end signal transmitted by the gas analysis instrument, it transmits an on-off instruction to the multi-way valve; the on-off instruction is used to sequentially turn on the gas path between the VOCs traceability detection equipment and the gas analysis instrument;

The processor receives the VOCs information transmitted by the gas analysis instrument and determines the location of the pollution source based on the VOCs information.

On the other hand, the embodiment of the present invention also provides a VOCs traceability detection method based on the above VOCs traceability detection equipment, including the steps:

When detecting that the volume of the gas to be measured in the gas storage device reaches the preset value, a reversing signal is transmitted to the gas reversing valve; the reversing signal is used to instruct the gas reversing valve to block the detection chamber, the gas storage device and the air pump The gas path between the carrier gas output port, the gas storage device and the gas analysis instrument is connected to the gas path;

Receive the VOCs information of each plane to be measured transmitted by the gas analysis instrument, and determine the location of the pollution source according to the VOCs information.

On the other hand, the embodiment of the present invention also provides a VOCs traceability detection method based on the above VOCs traceability detection system, including the steps:

When receiving the end signal transmitted by the gas analysis instrument, the on-off instruction is transmitted to the multi-way valve; the on-off instruction is used to instruct the multi-way valve to sequentially conduct the gas path between the VOCs traceability detection equipment and the gas analysis instrument;

It is detected that the multi-way valve has completed the on-off action and the VOCs traceability detection device corresponding to the gas path that is currently in the on state outputs carrier gas when the carrier gas output time reaches the preset length of time, the transmission switch to the corresponding gas reversing valve instruction;

Receive the VOCs information transmitted by the gas analysis instrument, and determine the location of the pollution source based on the VOCs information.

One of the above technical solutions has the following advantages and beneficial effects:

This application provides a VOCs traceability detection equipment, including a detection cavity, a gas reversing valve, a gas storage device, and a processor; the open surface of the detection cavity is used to cover the plane to be measured to obtain the VOCs of the plane to be measured, and process When the detector detects that the volume of the gas to be measured in the gas storage device reaches a preset value, it transmits a reversing signal to the gas reversing valve; the gas reversing valve blocks the detection chamber, gas storage equipment and pump according to the reversing signal The gas path between the carrier gas output port, the gas storage device and the gas analysis instrument is connected to the gas path. Through the above-mentioned traceability detection equipment, the VOCs released by the flat samples can be enriched and qualitatively and quantitatively tested, and the location of the pollution source can be confirmed by obtaining the information of the VOCs. At the same time, there is no need to destroy the plane to be measured, which fills the gap in the existing traceability technology. At the same time, the above-mentioned traceability testing equipment has the advantage of easy and fast assembly structure. If multiple VOCs traceability detection equipment are combined, the functions of multi-site simultaneous enrichment and multi-channel analysis can be realized, which saves monitoring time and meets the fast, accurate, multi-site, in-situ detection required for VOCs traceability demand.

Description of the drawings

Through a more detailed description of the preferred embodiments of the present application shown in the drawings, the above and other objectives, features and advantages of the present application will become clearer. In all the drawings, the same reference numerals indicate the same parts, and the drawings are not drawn on the scale of the actual size deliberately, and the focus is to show the gist of the present application.

Fig. 1 is a first schematic structural block diagram of a VOCs traceability detection device in an embodiment;

Figure 2 is a second schematic structural block diagram of the VOCs traceability detection equipment in an embodiment;

FIG. 3 is a third schematic structural block diagram of the VOCs traceability detection equipment in an embodiment;

Figure 4 is a fourth schematic structural block diagram of the VOCs traceability detection equipment in an embodiment;

Figure 5 is a structural block diagram of a detection cavity in an embodiment;

Figure 6 is a structural block diagram of a sealing element in an embodiment;

Figure 7 is a structural block diagram of a VOCs traceability detection system in an embodiment;

FIG. 8 is a schematic flowchart of a VOCs traceability detection method based on the above-mentioned VOCs traceability detection equipment in an embodiment;

FIG. 9 is a schematic flowchart of a VOCs traceability detection method based on the above VOCs traceability detection system in an embodiment;

10 is a structural block diagram of a VOCs traceability detection device based on the above-mentioned VOCs traceability detection equipment in an embodiment;

FIG. 11 is a structural block diagram of a VOCs traceability detection device based on the above-mentioned VOCs traceability detection system in an embodiment.

Detailed ways

In order to facilitate the understanding of the application, the application will be described in a more comprehensive manner with reference to the relevant drawings. The preferred embodiment of the application is shown in the accompanying drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to and integrated with another element, or there may be a centering element at the same time. The terms "covering", "gas path", "conducting" and similar expressions used herein are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used in the description of this application is only for the purpose of describing specific embodiments, and is not intended to limit the application. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

In traditional technology, VOCs traceability detection is generally achieved through the following two methods:

The first VOCs gas detection device includes a closed container, a vacuum pump, a gas storage bag, and a VOC detector; the closed container is provided with an openable sealed door, and the internal device of the closed container is equipped with a tray; the vacuum pump is connected to the The airtight container is connected, the gas storage bag is connected with the vacuum pump, and the probe of the VOC detector extends into the gas storage bag. The material to be tested is placed on the tray through the openable sealed door. After the volatile gas in the material to be tested is volatilized, the vacuum pump draws the volatile gas into the gas storage bag for detection by the VOC detector. The detection device is easy to operate and can be directly measured on site. The disadvantage is that it can only detect broken and small materials, and lacks in-situ detection without destroying the sample.

The second type of device includes a closed heating device, a TOC measuring instrument, an exhaust gas treatment device and several gas circulation pipes; the air outlet on the top of the closed heating device is in closed communication with the air inlet of the TOC measuring instrument, and the outlet of the TOC measuring instrument is connected to the exhaust gas treatment The device is closed and connected; the top of the tail gas treatment device is equipped with a detachable air outlet, which can be matched with the gas flow pipe; the detection method includes heating the soil sample, and the volatile organic compound enters the TOC meter to continuously measure the total volatile organic compound TOC. The detection cycle is short, the data is issued quickly, and the cost is low. The disadvantage is that it needs to collect soil samples into a closed cavity, lacks multi-channel detection methods, and can only detect soil at the same time, which cannot be widely used in the traceability analysis of VOCs.

Both of the above two technologies use a fully enclosed sealed chamber, which can detect the VOCs of the collected samples. The disadvantage is that the wall, the ground and other planes cannot be detected without destroying the sample to be tested. There are test samples in the traceability. Limitations of single species and inability to detect online in situ.

The VOCs traceability detection equipment provided by this application can effectively solve the above-mentioned problems.

In one embodiment, as shown in FIG. 1, a VOCs traceability detection device is provided, which includes a detection chamber 10, a gas reversing valve 20, a gas storage device 30, and a processor 40;

The open surface of the detection chamber 10 is used to cover the plane to be measured; the processor 40 is connected to the gas reversing valve 20; the gas reversing valve 20 is connected between the gas storage device 30 and the detection chamber 10, and is used to connect the air pumps respectively , Carrier gas output port and gas analysis instrument;

When the processor 40 detects that the volume of the gas to be measured in the gas storage device 30 reaches a preset value, it transmits a reversing signal to the gas reversing valve 20;

The gas reversing valve 20 blocks the gas path between the detection chamber 10, the gas storage device 30 and the air pump according to the reversing signal, and leads the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument ；

The processor 40 receives the VOCs information of each plane to be measured transmitted by the gas analysis instrument, and confirms the location of the pollution source according to the VOCs information

Wherein, the detection cavity is a cavity used to cover the plane to be measured and to accommodate VOCs emitted from the plane to be measured, and its shape and size are not specifically limited herein. The gas reversing valve is used for reversing the gas path between different devices. The gas storage device may be any device capable of storing gas in the field.

Specifically, the detection cavity is a non-fully enclosed cavity, which includes an open surface, and the open surface is used to cover the plane to be measured. The gas storage device is used to store volatilized VOCs on the plane covered by the detection chamber. The gas reversing valve is connected between the gas storage equipment and the detection chamber. In addition, the gas reversing valve is also connected to the gas pump, the carrier gas output port and the gas analysis instrument respectively. In the initial state, the gas reversing valve connects the gas path between the suction pump, the detection chamber and the gas storage device, that is, the gas path between the suction pump and the gas storage device, and the gas path between the gas storage device and the detection chamber. The gas path is connected. Under the action of the suction pump, the VOCs of the plane to be measured are pumped into the gas storage equipment.

The processor can detect that the volume of the gas to be measured in the gas storage device reaches the preset value by any means in the art. For example, receiving a signal from a gas volume detection device, etc. In a specific example, the volume of the gas to be measured can be detected by the gas flow meter, that is, the pipe volume and the real-time flow rate of the flow meter are known, and the time to reach the preset volume can be known. When the preset time is reached, the gas can be changed to Give a command to the valve. When the gas to be measured in the gas storage device reaches the required amount, the processor instructs the gas reversing valve to block the gas path between the detection chamber, the gas storage device and the suction pump, and conducts the carrier gas output port and storage The gas path between the gas equipment and the gas analysis instrument. It should be noted that the gas path between the detection chamber, the gas storage device and the suction pump refers to the gas path between the detection chamber and the gas storage device, the gas path between the gas storage device and the suction pump, and the detection cavity It is connected with the suction pump through the gas storage device. The gas path between the carrier gas output port, the gas storage device and the gas analysis instrument refers to the gas path between the carrier gas output port and the gas storage device, the gas path between the gas storage device and the gas analysis instrument, and the carrier gas output port passes through The gas storage device is connected to the gas analysis instrument. It should be noted that the carrier gas at the carrier gas output port can be any carrier gas in the art, such as nitrogen. When the gas reversing valve conducts the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument, the carrier gas output from the carrier gas output port carries the gas to be measured in the gas storage device into the gas analysis instrument, thereby To realize the detection of VOCs, the gas analysis instrument can be any kind of analysis instrument, such as mass spectrometer, infrared spectrometer, etc., which can be selected according to actual needs. The specific model of the gas reversing valve is not specified here, as long as the above functions can be realized. In a specific example, it may include a six-way valve, a ten-way valve, and so on. In one of the embodiments, the gas storage device includes a quantitative loop. In one of the embodiments, the cavity includes any one of the following shapes: a square shape, a hemispherical shape, and a pot lid shape.

VOCs information includes characteristic information such as concentration. If you test multiple planes to be tested, you can confirm the location of the pollution source based on the concentration of VOCs on multiple planes to be tested. Further, the plane to be measured with the highest concentration of VOCs is confirmed as the pollution source, and the location of the pollution source is obtained.

The above-mentioned VOCs traceability detection equipment includes a detection cavity, a gas reversing valve, a gas storage device, and a processor; the open surface of the detection cavity is used to cover the plane to be measured to obtain VOCs of the plane to be measured, and the processor detects the gas storage When the volume of the gas to be measured in the equipment reaches the preset value, it transmits a reversing signal to the gas reversing valve; the gas reversing valve blocks the gas path between the detection chamber, the gas storage device and the air pump according to the reversing signal , And lead the gas path between the carrier gas output port, gas storage equipment and gas analysis instrument. Through the above-mentioned traceability detection equipment, the VOCs released by the plane sample can be enriched and qualitatively tested without destroying the plane to be tested, which fills the gap in the existing traceability technology. At the same time, the above-mentioned traceability testing equipment has the advantages of easy and fast assembly structure. If multiple VOCs traceability detection equipment are combined, the functions of multi-site simultaneous enrichment and multi-channel analysis can be realized, which saves monitoring time and meets the fast, accurate, multi-site, in-situ detection required for VOCs traceability demand.

In one embodiment, as shown in Figures 2 and 3, the gas reversing valve may include a six-way valve;

The six-way valve includes a first channel opening 21, a second channel opening 22, a third channel opening 23, a fourth channel opening 24, a fifth channel opening 25, and a sixth channel opening 26 arranged in sequence in the circumferential direction; the first channel opening 21 and the fourth channel port 24 are connected through the gas storage device 30; the second channel port 22 is connected to the detection chamber 10; the third channel port 23 is used to connect to the suction pump; the fifth channel port 25 is used to connect the carrier gas output port; The six-channel port 26 is used to connect a gas analysis instrument.

The six-way valve connects the second channel port 22 and the third channel port 23, connects the fourth channel port 24 and the fifth channel port 25, and connects the sixth channel port 26 and the first channel port 21 based on the reversing signal.

Specifically, at the initial time of the internal gas path of the six-way valve (see Figure 2 for details), the first channel port 21 and the second channel port 22 are in a connected state, and the third channel port 23 and the fourth channel port 24 are in a connected state , The fifth passage port 25 and the sixth passage port 26 are in a communicating state. The suction pump is connected to the third channel port 23, the two ends of the gas storage device are respectively connected to the first channel port 24 and the fourth channel port 24, and the second channel port 22 is connected to the detection cavity. Therefore, the gas path between the suction pump, the gas storage device, and the detection chamber is in a connected state, and the suction pump pumps the VOCs collected in the detection chamber to the gas storage device.

When the processor detects that the volume of the gas to be measured in the gas storage device reaches the preset value, it transmits a reversing signal to the gas reversing valve; the gas reversing valve adjusts the internal gas path from the initial state according to the reversing signal To the commutation state (see Figure 3 for details), that is, the second channel port 22 and the third channel port 23 are in a connected state, the fourth channel port 24 and the fifth channel port 25 are in a connected state, and the sixth channel port 26 is in a connected state with the first channel port. The channel port 21 is in a connected state. Therefore, the gas path between the detection chamber, the gas storage device and the gas pump is blocked, and the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument is connected. The carrier gas carries the gas to be measured to the gas analysis instrument.

The above-mentioned six-way valve effectively adjusts the entire internal passage without changing the connection relationship between the valve passage port and the external device.

In one embodiment, as shown in FIG. 4, a VOCs traceability detection device is provided, which includes a detection chamber 10, a gas reversing valve 20, a gas storage device 30, and a processor 40;

The gas reversing valve 20 blocks the gas path between the detection chamber 10, the gas storage device 30 and the air pump according to the reversing signal, and leads the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument .

It also includes heating equipment 50 and solenoid valve 60;

The input end of the solenoid valve 50 is connected to the detection chamber 10, and the output end is connected to the gas reversing valve 20; the heating device 50 is used to heat the gas in the detection chamber;

When the processor 40 detects that the heating time of the heating device 50 reaches a preset value, it sends an opening command to the solenoid valve 60; the opening command is used to instruct the solenoid valve to conduct the gas path between the detection chamber 10 and the gas reversing valve 20.

Specifically, the heating device can be any device with a heating function, which is not specifically limited here.

The heating equipment is used to accelerate the volatilization of VOCs on the plane to be tested, so that VOCs can be obtained faster, thereby shortening the entire traceability detection time. The solenoid valve is used to conduct the gas path between the detection cavity and the gas reversing valve. When it is detected that the heating time of the heating device reaches the preset value, an opening command is sent to the solenoid valve, which leads to the gas path between the detection chamber and the gas reversing valve, so that the VOCs gas in the detection chamber flows to the gas reversing valve in. It should be noted that the heating temperature of the heating device can be adjusted as needed. In a specific example, a heating grid can be used to heat the gas in the cavity at 50°C, and the distance between the heating grid and the plane to be measured is 1 cm.

In one of the embodiments, as shown in FIG. 5, the seal 1 is further included;

Wherein, the sealing member can be any device capable of sealing the contact surface between the detection cavity and the plane to be measured. In a specific example, the sealing member may include a fluorine rubber material and a butyl rubber material to facilitate sealing while ensuring low VOCs volatility of the sealing material. Furthermore, for different planes, different methods can be used for sealing. For example, for non-smooth and irregular horizontal planes, heavy pressure sealing can be used; for thin planes such as billboards, as shown in Figure 6, a cap-shaped cavity can be used. The two sides are sealed by the magnetic force of the rubidium magnet ring. For vertical planes such as walls, vacuum suction cups or horizontal pressing machines can be used.

In one of the embodiments, it further includes a vacuum chuck;

The vacuum chuck is arranged on the edge of the detection cavity.

The detection cavity is adsorbed on the plane to be measured by the vacuum suction cup. Specifically, the vacuum chuck is fixed in the vacuum chuck groove. It should be noted that the vacuum chuck groove is provided on the edge of the detection cavity. The outside can be connected to the vacuum chuck groove through a pipe. The side of the vacuum chuck in contact with the plane is provided with a connecting groove that connects all the holes to increase the vacuum area while ensuring the same vacuum degree of each hole.

In one embodiment, as shown in FIG. 7, a VOCs traceability detection system is also provided, including a multi-port valve 70, a gas analysis instrument 80, and at least one VOCs traceability detection device 100 according to any one of claims 1 to 7 (Not shown in Figure 6);

Each processor 40 (not shown in FIG. 6) is connected to a multi-way valve 70; each gas reversing valve 20 is connected to a gas analysis instrument 80 through the multi-way valve 70;

When any processor receives the end signal transmitted by the gas analysis instrument, it transmits an on-off instruction to the multi-way valve; the on-off instruction is used to sequentially connect the VOCs traceability detection equipment and the gas path of the gas analysis instrument.

The processor receives the VOCs information transmitted by the gas analysis instrument, and determines the location of the pollution source based on the VOCs information.

That is, if there are VOCs traceability detection equipment A, B, C, and the gas path of the gas analysis instrument is a, b, c, then turn on a, close b and c, when receiving the end signal, close a and conduct Pass b; when the end signal is received, close b and pass c until all the air passages pass through once. In the step of the processor receiving the VOCs information transmitted by the gas analysis instrument, any processor may receive the VOCs information.

It should be noted that the processor of each VOCs traceability detection equipment can be composed of different modules of one processor, that is, one processor is responsible for the control of all solenoid valves and gas reversing valves in the system.

Specifically, the end signal is used to indicate that the current gas detection has ended. When the processor receives the signal, it instructs the multi-way valve to sequentially conduct the gas path of the VOCs traceability detection equipment and the gas analysis instrument.

The above-mentioned VOCs traceability detection system can detect multiple planes to be tested, realize the functions of multi-site simultaneous enrichment and multi-channel analysis, and has a faster output of pollution source locations, which saves monitoring time and meets the needs of VOCs traceability The need for rapid, accurate, multi-site, in-situ detection.

In an embodiment, as shown in FIG. 8, an embodiment of the present invention also provides a VOCs traceability detection method based on the above-mentioned VOCs traceability detection device, including the steps:

S810: It is detected that the volume of the gas to be measured in the gas storage device reaches a preset value, and a reversing signal is transmitted to the gas reversing valve; the reversing signal is used to instruct the gas reversing valve to block the detection chamber, the gas storage device, and the pumping device. The gas path between the gas pumps and the gas path between the carrier gas output port, gas storage equipment and gas analysis instrument.

It should be noted that any technical means in the art can be used to detect the volume of the gas to be measured in the gas storage device. Specifically, the detection can be carried out directly or through other detection equipment, and it can also be considered that the volume of the gas to be measured in the gas storage equipment reaches the preset value after receiving the signal transmitted by the other detection equipment.

S820: Receive the VOCs information of each plane to be measured transmitted by the gas analysis instrument, and determine the location of the pollution source according to the VOCs information.

In an embodiment, as shown in FIG. 9, a method for VOCs traceability detection based on the above-mentioned VOCs traceability detection system is also provided, including the steps:

S910, when receiving the end signal transmitted by the gas analysis instrument, transmit an on-off instruction to the multi-port valve; the on-off instruction is used to instruct the multi-port valve to sequentially conduct the gas path between the VOCs traceability detection equipment and the gas analysis instrument;

It should be noted that the on-off command is used to turn on the gas path of the VOCs traceability detection equipment and the gas analysis instrument in turn. That is, if there are VOCs traceability detection equipment A, B, C, and the gas path of the gas analysis instrument is a, b, c, then turn on a, close b and c, when receiving the end signal, close a and conduct Pass b; when receiving the end signal, close b and turn on c until all the air passages pass through once.

S920: When it is detected that the multi-way valve completes the on-off action, and the carrier gas output port of the VOCs traceability detection device corresponding to the gas path that is currently in the conducting state outputs carrier gas for a preset time period, the corresponding gas reversing valve Transmit switching instructions.

By purging the gas path with carrier gas, the channel can be prevented from being contaminated, thereby improving the accuracy of detection.

S930: Receive the VOCs information transmitted by the gas analysis instrument, and determine the location of the pollution source according to the VOCs information.

Among them, the VOCs information includes the concentration information transmitted by each traceability detection device. According to the concentration information, the plane to be tested corresponding to the highest concentration of VOCs can be confirmed as the pollution source and the location of the pollution source can be output.

It should be understood that although the steps in the flowcharts of FIGS. 8 and 9 are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless specifically stated in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least part of the steps in Figures 8 and 9 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. These sub-steps or stages The execution order of is not necessarily performed sequentially, but may be performed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

In an embodiment, as shown in FIG. 10, a VOCs traceability detection device based on the above-mentioned VOCs traceability detection equipment is provided, including:

The detection module 1010 is used to detect that the volume of the gas to be measured in the gas storage device reaches a preset value, and transmits a reversing signal to the gas reversing valve; the reversing signal is used to instruct the gas reversing valve to block the detection chamber and the storage The gas path between the gas equipment and the suction pump, and the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument.

The location confirmation module 1020 is used to receive the VOCs information of each plane to be measured transmitted by the gas analysis instrument, and determine the location of the pollution source according to the VOCs information.

In one embodiment, as shown in FIG. 11, a VOCs traceability detection device based on the above-mentioned VOCs traceability detection system is provided, including:

The on-off instruction generating module 1110 is used to transmit on-off instructions to the multi-way valve when receiving the end signal transmitted by the gas analysis instrument; the on-off instructions are used to turn on the gas between the VOCs traceability detection equipment and the gas analysis instrument in turn Road channel

The switching command generation module 1120 is used to detect that the multi-way valve has completed the on-off action and the VOCs traceability detection device corresponding to the gas path that is currently in the on-state output carrier gas output for the preset time period. The corresponding gas reversing valve transmits switching instructions.

The pollution source confirmation module 1130 is used to receive VOCs information transmitted by the gas analysis instrument, and determine the location of the pollution source according to the VOCs information.

Regarding the specific limitations of the VOCs traceability detection device, please refer to the above definition of the VOCs traceability detection method, which will not be repeated here. Each module in the above VOCs traceability detection device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules may be embedded in the form of hardware or independent of the processor in the computer equipment, or may be stored in the memory of the computer equipment in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned modules.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

When it is detected that the volume of the gas to be measured in the gas storage device reaches a preset value, a reversing signal is transmitted to the gas reversing valve; the reversing signal is used to instruct the gas reversing valve to block the detection chamber, The gas path between the gas storage device and the gas pump, and lead to the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument;

In an embodiment, when the computer program is executed by the processor, the following steps are further implemented:

A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage. In the medium, when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database, or other media used in the embodiments provided in this application may include non-volatile and/or volatile memory. Non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not a limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Channel (Synchlink) DRAM (SLDRAM), memory bus type dynamic random access memory (Rambus DRAM, RDRAM for short), and interface dynamic random access memory (DRDRAM), etc.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A VOCs traceability detection equipment, which is characterized in that it comprises a detection chamber, a gas reversing valve, a gas storage device and a processor;

The open surface of the detection cavity is used to cover the plane to be measured; the processor is connected to the gas reversing valve; the gas reversing valve is connected between the gas storage device and the detection cavity, and Used to connect the suction pump, the carrier gas output port and the gas analysis instrument respectively;

When the processor detects that the volume of the gas to be measured in the gas storage device reaches a preset value, transmitting a reversing signal to the gas reversing valve;

The gas reversing valve blocks the gas path between the detection cavity, the gas storage device, and the gas pump according to the reversing signal, and conducts the carrier gas output port and the gas storage The gas path between the gas equipment and the gas analysis instrument;

The processor receives the VOCs information of each plane to be measured transmitted by the gas analysis instrument, and confirms the location of the pollution source according to the VOCs information.
The VOCs traceability detection equipment according to claim 1, wherein the gas reversing valve comprises a six-way valve;

The six-way valve includes a first channel port, a second channel port, a third channel port, a fourth channel port, a fifth channel port, and a sixth channel port that are sequentially arranged in a circumferential direction; the first channel port and the The fourth channel port is connected through the gas storage device; the second channel port is connected to the detection chamber; the third channel port is used to connect to a suction pump; the fifth channel port is used to connect a carrier gas output Port; The sixth channel port is used to connect a gas analysis instrument;

Wherein, the six-way valve communicates with the second passage port and the third passage port, connects the fourth passage port and the fifth passage port, and communicates with the sixth passage based on the reversing signal口 and said first channel port.
The VOCs traceability detection device according to claim 1, characterized in that it further comprises a heating device and a solenoid valve;

The input end of the solenoid valve is connected to the detection cavity, and the output end is connected to the gas reversing valve; the heating device is used to heat the gas in the detection cavity;

When the processor detects that the heating time of the heating device reaches a preset value, it sends an opening instruction to the solenoid valve; the opening instruction is used to instruct the solenoid valve to conduct the detection cavity and the gas The gas path between the reversing valves.
The VOCs traceability detection equipment according to claim 1, characterized in that it further comprises a seal;

The sealing element is used to seal the contact surface between the detection cavity and the plane to be measured.
The VOCs traceability detection equipment according to claim 2, characterized in that it further comprises a vacuum chuck;

The vacuum chuck is arranged on the edge of the detection cavity.
The VOCs traceability detection equipment according to claim 1, wherein the gas storage equipment comprises a quantitative ring.
The VOCs traceability detection equipment according to claim 1, wherein the cavity includes any one of the following shapes: square, hemispherical, and pot cover shape.
A VOCs traceability detection system, which is characterized by comprising a multi-port valve, a gas analysis instrument, and at least one VOCs traceability detection device according to any one of claims 1 to 7;

Each of the processors is connected to the multi-way valve; each of the gas reversing valves is connected to the gas analysis instrument through the multi-way valve;

When any one of the processors receives the end signal transmitted by the gas analysis instrument, it transmits an on-off instruction to the multi-way valve; the on-off instruction is used to turn on each of the VOCs traceability detection equipment and all of them in turn. The gas path between the gas analysis instruments;

The processor receives the VOCs information transmitted by the gas analysis instrument, and determines the location of the pollution source according to the VOCs information.
A VOCs traceability detection method based on the VOCs traceability detection equipment according to any one of claims 1 to 7, characterized in that it comprises the steps of:

It is detected that the volume of the gas to be measured in the gas storage device reaches a preset value, and a reversing signal is transmitted to the gas reversing valve; the reversing signal is used to instruct the gas reversing valve to block the detection A gas path between the cavity, the gas storage device and the gas pump, and lead to the gas path between the carrier gas output port, the gas storage device and the gas analysis instrument;

Receive the VOCs information of each plane to be measured transmitted by the gas analysis instrument, and confirm the location of the pollution source according to the VOCs information.
A VOCs traceability detection method based on the VOCs traceability detection system of claim 5, characterized in that it comprises the steps of:

When the end signal transmitted by the gas analysis instrument is received, an on-off instruction is transmitted to the multi-way valve; the on-off instruction is used to instruct the multi-way valve to turn on each of the VOCs traceability detection equipment and all The gas path between the gas analysis instruments;

When it is detected that the multi-way valve has completed the on-off action and the VOCs traceability detection device corresponding to the gas path currently in the on-state output carrier gas for the preset time period, the corresponding gas reversing valve Transmitting the switching instruction;

Receive the VOCs information transmitted by the gas analysis instrument, and determine the location of the pollution source according to the VOCs information.