Cigarette smoke cold trap trapping device and trapping analysis system and method thereof

Abstract

The invention relates to the field of cigarette smoke analysis and detection, and discloses a cigarette smoke cold trap trapping device and a trapping analysis system and method thereof, and the cold trap trapping device comprises a trapping pipe, a vacuum cover, a vacuum pump, a refrigerator, a heat exchanger, a heater, a discharge pipe, a mounting pipe, a gas source and a switch valve. The trapping pipe is arranged in the vacuum cover, the vacuum pump is used for adjusting the pressure in the vacuum cover, the refrigerating machine is used for stepless adjustment of the refrigerating temperature of the trapping pipe, the heat exchanger and the heater are arranged on the periphery of the trapping pipe in a surrounding mode, and the discharge pipe and the installation pipe are communicated to a first port in a parallel connection mode. The positive pressure source and the negative pressure source are communicated with the second port in parallel, so that a stepless adjustable pressure and temperature environment is provided for the trapping pipe, different experiment requirements are met, and the comprehensiveness of detection and analysis is improved; the heat exchanger, the heater, the gas source and the switch valve are matched to operate, so that efficient thermal desorption of flue gas in the trapping pipe is realized, and the trapping detection and analysis efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of cigarette smoke analysis and detection, and in particular to a cigarette smoke cold trap capture device and a capture and analysis system and method thereof. Background Art

[0002] Cigarette smoke is the direct product of cigarette products for consumers, and its chemical composition directly determines the product's flavor characteristics and sensory quality. Through smoke chemical analysis, we can reveal the material basis of sensory quality and product specificity, thereby establishing a smoke composition control system centered on raw materials, materials, and flavors, ultimately achieving precise control of product flavor characteristics and optimizing and improving sensory quality.

[0003] The detection and analysis process of cigarette smoke usually includes key links such as smoke generation, capture, desorption and analysis. Among them, the smoke capture link has a decisive influence on the accuracy of the analysis results. At present, the cold trap capture method is one of the commonly used smoke capture methods. It achieves efficient capture of smoke components by reducing the speed of molecular thermal motion and combining the collision interception effect of the tube wall. Compared with other capture methods, cold trap capture excels in reducing chemical reactions and component losses and has strong applicability. In addition, the capture tube of the cold trap capture can also be used in conjunction with an adsorbent to further enhance the overall capture effect.

[0004] However, traditional cold traps typically use a dry ice-isopropyl alcohol mixture in the trap tube to create a low-temperature environment as low as -80°C. This method not only requires frequent additions of dry ice to maintain the low temperature, resulting in high detection and analysis costs, but also limits operational efficiency and experimental stability, making it unable to meet the needs of a wider range of experiments and significantly impacting the efficiency of flue gas capture, detection, and analysis. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems of limited and inefficient traditional cold trap capture detection and analysis, and to provide a cigarette smoke cold trap capture device, which can meet more cold trap capture experimental requirements and improve the capture detection and analysis efficiency of smoke.

[0006] To achieve the above-mentioned object, the present invention provides a cigarette smoke cold trap capture device in a first aspect, comprising a capture tube having a first port and a second port, and the cold trap capture device further comprising: A vacuum hood and a vacuum pump, wherein the collecting tube is placed in the vacuum hood and the vacuum pump is used to adjust the pressure in the vacuum hood; A refrigerator, the refrigerator including a Stirling refrigerator and configured to steplessly adjust the refrigeration temperature at the capture tube; The heat exchanger and heater are both arranged around the outer periphery of the collecting tube; A discharge pipe and a mounting pipe, wherein the discharge pipe and the mounting pipe are connected to the first port in parallel, and an end of the mounting pipe away from the first port is used for mounting and connecting the filter end of the cigarette to be tested; an air source, the air source comprising a positive pressure source and a negative pressure source, the positive pressure source and the negative pressure source being connected to the second port in parallel; and The switch valve is set at least in the installation pipe, in the discharge pipe, between the negative pressure source and the second port, and between the positive pressure source and the second port.

[0007] In some embodiments, the cold trap capture device further includes a verification capture module and an on-off module, which are connected in parallel between the second port and the gas source, and at most one of the verification capture module and the on-off module is in an open state.

[0008] In some embodiments, the capture tube contains an adsorbent.

[0009] In some embodiments, an adsorption capture module is detachably mounted on the mounting tube.

[0010] In some embodiments, the heat exchanger includes an oxygen-free copper plate heat exchanger and a martensitic stainless steel plate heat exchanger; and the heater is a ZVS heater.

[0011] In some embodiments, the positive pressure source includes a positive pressure inert gas source and a positive pressure air source, and the positive pressure inert gas source, the positive pressure air source and the negative pressure source are connected to the second port in parallel.

[0012] In some embodiments, the cold trap capture device further includes a first connecting pipe, a second connecting pipe and an adapter, wherein the first connecting pipe is connected to the first port via the adapter, and the second connecting pipe is connected to the second port via the adapter; The discharge pipe and the installation pipe are connected in parallel to one end of the first connecting pipe away from the first port, and the positive pressure source and the negative pressure source are connected in parallel to one end of the second connecting pipe away from the second port.

[0013] In some embodiments, the first connecting tube and the second connecting tube are both made of polytetrafluoroethylene tubes, and a polytetrafluoroethylene gasket is provided in the adapter.

[0014] The cigarette smoke cold trap capture device using the above technical solution of the present invention has the following effects: The vacuum pump, vacuum hood, and refrigerator work together to provide a steplessly adjustable pressure and temperature environment for the capture tube, meeting diverse experimental requirements and enhancing comprehensiveness of detection and analysis. The heat exchanger, heater, gas source, and on / off valve work together to achieve efficient thermal desorption of flue gas from the capture tube, improving capture, detection, and analysis efficiency.

[0015] A second aspect of the present invention provides a cigarette smoke capture and analysis system, comprising a control device, an analysis device, and the cigarette smoke cold trap capture device as described above. The analysis device is used to connect to the end of the exhaust pipe away from the first port and analyze the gas discharged from the exhaust pipe. The control device is electrically connected to the vacuum pump, refrigerator, heat exchanger, and heater.

[0016] A third aspect of the present invention provides a cigarette smoke capture and analysis method of the above-mentioned cigarette smoke capture and analysis system, the capture and analysis method comprising the following steps: The vacuum pump and refrigerator are operated to adjust the environment of the collection tube to the required pressure and temperature. The filter end of the cigarette to be tested is installed on the installation tube and the cigarette to be tested is ignited. The on-off valve in the installation pipe and the on-off valve between the negative pressure source and the second port are opened, and the on-off valve in the discharge pipe and the on-off valve between the positive pressure source and the second port are closed. The negative pressure source is operated to cause the flue gas to flow along the flow path of the installation pipe and the collection pipe. During this process, the collection pipe collects the flue gas. After the capture process is completed, the switch valve in the installation pipe and the switch valve between the negative pressure source and the second port are closed, and the switch valve in the discharge pipe and the switch valve between the positive pressure source and the second port are opened. The positive pressure source is operated to discharge the flue gas in the capture pipe from the discharge pipe for replacement; After the replacement is completed, the switch valve is closed, the analysis device is connected to the discharge pipe, and the heat exchanger, heater and refrigerator are operated in coordination to adjust the ambient temperature of the capture tube to the temperature required for thermal desorption; Close the switch valve in the installation pipe and the switch valve between the negative pressure source and the second port, open the switch valve in the exhaust pipe and the switch valve between the positive pressure source and the second port, operate the positive pressure source, and discharge the flue gas in the capture pipe from the exhaust pipe into the analysis device for flue gas analysis.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a cigarette smoke cold trap capture device according to one embodiment of the present invention; Figure 2 2 is a schematic structural diagram of a cigarette smoke cold trap capture device according to a second embodiment of the present invention; Figure 3 2 is a schematic structural diagram of a cigarette smoke cold trap capture device according to a third embodiment of the present invention; Figure 4 It is the temperature control diagram during the capture and adsorption process, T0 is the refrigeration head temperature, T1 is the oxygen-free copper plate heat exchanger temperature; Figure 5It is the temperature control diagram during the desorption process, T0 is the refrigeration head temperature, T1 is the martensitic stainless steel plate heat exchanger temperature; Figure 6 2 is a schematic structural diagram of a cigarette smoke cold trapping device according to a fourth embodiment of the present invention; Figure 7 2 is a schematic structural diagram of a cigarette smoke cold trapping device according to a fifth embodiment of the present invention; Figure 8 It is a structural schematic diagram of a cigarette smoke cold trap capture and analysis system according to one embodiment of the present invention.

[0019] Description of Reference Numerals 1. Capture tube; 2. First port; 3. Second port; 4. Vacuum cover; 5. Vacuum pump; 6. Refrigerator; 7. First connecting tube; 8. Second connecting tube; 9. Adapter; 10. Mounting tube; 11. Negative pressure source; 12. Verification capture module; 13. On / off module; 14. Adsorption capture module; 15. Heat exchanger; 16. Discharge pipe; 17. Positive pressure source; 18. Switch valve; 19. Oxygen-free copper plate heat exchanger; 20. Martensitic stainless steel plate heat exchanger; 21. Positive pressure inert gas source; 22. Positive pressure air source; 23. Control device; 24. Analytical device; 25. Thermometer; 26. First discharge pipe; 27. Second discharge pipe; 28. Sampling bag; 29. ​​Water inlet; 30. Water outlet; 31. Heater; 100. Cigarette to be tested; 200. Gas source. DETAILED DESCRIPTION

[0020] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0021] In the first aspect of the present invention, a cigarette smoke cold trap capture device is provided, as shown in the attached Figure 1 As shown, the cold trap capture device includes a capture tube 1, a vacuum cover 4, a vacuum pump 5, a refrigerator 6, a heat exchanger 15, a heater 31, an exhaust pipe 16, a mounting pipe 10, a gas source 200, and an on-off valve 18. The capture tube 1 is placed in the vacuum cover 4. The vacuum pump 5 is used to adjust the pressure in the vacuum cover 4. The refrigerator 6 uses a Stirling refrigerator to steplessly adjust the cooling temperature at the capture tube 1. The heat exchanger 15 and the heater 31 are arranged around the outer periphery of the capture tube 1. The refrigerator 6, the heat exchanger 15, and the heater 31 cooperate to adjust the cooling and heating temperatures at the capture tube 1, so that the capture tube 1 can achieve low-temperature cold trap capture and high-temperature thermal desorption.

[0022] The collection tube 1 has a first port 2 and a second port 3. The discharge tube 16 and the mounting tube 10 are connected in parallel to the first port 2. The end of the mounting tube 10, remote from the first port 2, is used to connect to the filter end of the cigarette 100 to be tested. In actual use, the filter ends of different models and brands of cigarettes 100 to be tested vary in size and shape, so the end of the mounting tube 10 that connects to the filter end of the cigarette 100 to be tested needs to be designed with an adaptable interface. The gas source 200 includes a positive pressure source 17 and a negative pressure source 11, which are connected in parallel to the second port 3. Several on-off valves 18 are provided, at least in the mounting tube 10, the discharge tube 16, between the negative pressure source 11 and the second port 3, and between the positive pressure source 17 and the second port 3. The opening and closing of each on-off valve 18 controls and switches the direction and path of gas flow within the pipeline.

[0023] Specifically, the cigarette smoke cold trap capture device operates as follows: Initially, the vacuum pump 5 and the refrigerator 6 cooperate to provide the collecting pipe 1 with a suitable ambient temperature and pressure.

[0024] Smoke capture process: open the switch valve 18 in the installation tube 10 and the switch valve 18 between the negative pressure source 11 and the second port 3, and close the switch valve 18 in the discharge pipe 16 and the switch valve 18 between the positive pressure source 17 and the second port 3; ignite the cigarette 100 to be tested and operate the negative pressure source 11. The generated smoke flows from the installation tube 10 to the capture tube 1 under the action of the negative pressure source 11, and part of the smoke is captured at the capture tube 1.

[0025] Replacement process: close the switch valve 18 in the installation pipe 10 and the switch valve 18 between the negative pressure source 11 and the second port 3, open the switch valve 18 in the discharge pipe 16 and the switch valve 18 between the positive pressure source 17 and the second port 3, and the flue gas in the collection pipe 1 is discharged from the discharge pipe 16 under the action of the positive pressure source 17 for replacement.

[0026] Thermal desorption process: Close the on-off valve 18, and adjust the ambient temperature of the collection tube 1 to the temperature required for thermal desorption through the coordinated operation of the heat exchanger 15, the heater 31, and the refrigerator 6. The flue gas components captured in the collection tube 1 are desorbed on the collection tube 1. Specifically, the heater 31 heats the collection tube 1, and the heat exchanger 15 is used to uniformly heat and quickly increase the temperature of the collection tube 1 through heat exchange, and the refrigerator 6 stops running. In addition, multiple thermometers 25 can be configured on the surface of the collection tube 1 to monitor the temperature at the collection tube 1, so as to improve the temperature control accuracy of the collection tube 1 during the capture and desorption process. Specifically, the thermometer 25 can be directly set on the collection tube 1 for temperature monitoring, or it can be set on the heat exchanger 15 to monitor the temperature of the heat exchanger 15 to reflect the temperature of the collection tube 1. For the heat exchanger 15 , if water is used as the heat exchange medium, a water inlet 29 and a water outlet 30 of the heat exchanger 15 need to be configured, and the water inlet 29 and the water outlet 30 need to be connected to an external water source.

[0027] During the flue gas component discharge process, the on-off valve 18 in the mounting tube 10 and the on-off valve 18 between the negative pressure source 11 and the second port 3 remain closed. The on-off valve 18 in the discharge tube 16 and the on-off valve 18 between the positive pressure source 17 and the second port 3 are opened. Desorbed flue gas components are discharged from the discharge tube 16 under the action of the positive pressure source 17. Specifically, the desorbed flue gas components discharged from the discharge tube 16 can be directly passed into flue gas analysis equipment for analysis, or passed into a sampling bag 28 for collection and storage for subsequent use. In some preferred embodiments, the discharge tube 16 includes a first discharge tube 26 and a second discharge tube 27. The first discharge tube 26, the second discharge tube 27, and the mounting tube 10 are connected in parallel to the first port 2. The first discharge tube 26 is connected to the flue gas analysis equipment, while the second discharge tube 27 is open. When flue gas collection is required, a sampling bag 28 can be placed over the second discharge tube 27. This design reduces the need for frequent disassembly and connection of flue gas analysis equipment.

[0028] In summary, by steplessly adjusting the ambient temperature and pressure at the collection tube 1 through the vacuum pump 5 and the refrigerator 6, this cigarette smoke cold trap capture device can meet more capture requirements and improve the comprehensiveness of subsequent detection and analysis compared to existing cold trap capture. After the collection tube 1 completes smoke capture, thermal desorption of the collection tube 1 is achieved through the coordinated operation of the heat exchanger 15, heater 31, and refrigerator 6, and the coordinated opening and closing of the switch valve 18. Finally, the analysis or collection of the smoke components after desorption is achieved through the switching use of the positive pressure source 17 and the negative pressure source 11, and the coordinated opening and closing of the switch valve 18, thereby improving the efficiency of smoke capture, detection, and analysis.

[0029] Typically, negative pressure source 11 is a smoking device whose suction power and frequency simulate the suction force and frequency of a person smoking. Positive pressure source 17 is a blower capable of performing a blowing function. In other embodiments, positive pressure source 17 and negative pressure source 11 may be integrated, employing a blower with combined blowing and suction functions. In this case, switching between positive and negative pressure sources 17 and 11 can be achieved by switching the fan's own functions.

[0030] In some preferred embodiments, Figure 2 As shown, the cold trap capture device further includes a verification capture module 12 and an on-off module 13, which are connected in parallel between the second port 3 and the gas source 200. At most one of the verification capture module 12 and the on-off module 13 is in the open state.

[0031] When the verification capture module 12 is turned on, the on-off module 13 is in the off state. At this time, during the cold trap capture process, the flow path of the flue gas is the installation tube 10, the capture tube 1, and the verification capture module 12. The greater the amount of flue gas captured in the verification capture module 12, the smaller the amount of flue gas captured in the capture tube 1. In this regard, by comparing the amount of flue gas captured in the verification capture module 12, the capture capacity of the capture tube 1 under different pressure and temperature environments can be determined. During application, the pressure and temperature at the capture tube 1 are adjusted to appropriate values ​​so that the flue gas capture capacity of the capture tube 1 meets the corresponding requirements.

[0032] When the capture capacity of the capture tube 1 does not need to be verified, the on-off module 13 is turned on and the verification capture module 12 is in the off state. At this time, during the cold trap capture process, the flue gas flow path is the installation tube 10, the capture tube 1, and the on-off module 13. The on-off module 13 is only used to provide a passage, so that the flue gas at the second port 3 can flow directly to the negative pressure source 11 when verification using the verification capture module 12 is not required.

[0033] When the flue gas does not need to flow, the verification and capture module 12 and the on-off module 13 can be closed. At this time, the flow path of the flue gas is in a disconnected state.

[0034] Specifically, the verification capture module 12 can adopt but is not limited to the existing isopropyl alcohol-dry ice cold trap and XAD-2 adsorption tube cold trap capture and the existing adsorption capture based on Cambridge filter. The switch of the verification capture module 12 and the on-off module 13 can adopt the same pipeline based on the on-off control of the switch valve 18.

[0035] In some preferred embodiments, the capture tube 1 is embedded with an adsorbent. Specifically, the adsorbent may be, but is not limited to, activated carbon molecular sieves, metal-modified materials, and organic adsorbents. The combination of the capture tube 1 and the adsorbent can enhance the capture efficiency of the capture tube 1.

[0036] In some preferred embodiments, Figure 3 As shown, the mounting tube 10 is detachably mounted with an adsorption capture module 14. Specifically, the adsorption capture module 14 can adopt the existing adsorption capture based on the Cambridge filter. When only cold trap capture is required, the adsorption capture module 14 does not need to be installed on the mounting tube 10. When only adsorption capture is required, the adsorption capture module 14 is installed on the mounting tube 10, and the vacuum pump 5 and the refrigerator 6 are not running, so that the capture tube 1 is at normal temperature and pressure, and no adsorbent is placed in the capture tube 1. When adsorption capture and cold trap capture are required to be linked, the adsorption capture module 14 is installed on the mounting tube 10, and the pressure and temperature environment at the capture tube 1 are adjusted by the coordinated operation of the vacuum pump 5 and the refrigerator 6. With such a design, you can choose from the three capture methods of cold trap capture, adsorption capture, and cold trap and adsorption combined capture based on your needs.

[0037] Of course, when the verification capture module 12 and the on-off module 13 are configured on the basis of the above three capture methods, the capture efficiency and capture capacity of the two methods of adsorption capture and cold trap and adsorption combined capture can also be verified. It should be noted that when only the adsorption capture module 14 is used for adsorption capture, the pressure and temperature environment at the capture tube 1 does not affect the adsorption capture efficiency and capacity in the adsorption capture module 14. The adsorption capture module 14 is detachable and can be replaced by verifying the capture efficiency and capture capacity of the adsorption capture module 14 of different types of adsorbents.

[0038] In some preferred embodiments, Figure 1 , Attachment Figure 4 and attached Figure 5 As shown, the heat exchanger 15 includes an oxygen-free copper plate heat exchanger 19 and a martensitic stainless steel plate heat exchanger 20, and the heater 31 adopts a ZVS heater. During the capture process, the oxygen-free copper plate heat exchanger 19 can achieve stable control between -120°C and -70°C. At the same time, the martensitic stainless steel plate heat exchanger 20 can quickly heat up to 300°C within two minutes during the desorption process and reach stability within five minutes. In summary, the oxygen-free copper plate heat exchanger 19 has good thermal stability and anti-interference capabilities, fast temperature control response and small fluctuations. It can maintain the temperature stability of the capture tube 1 during the capture and desorption process, improve the flue gas capture efficiency, and provide reliable protection for the flue gas analysis results. The martensitic stainless steel plate heat exchanger 20 is used for rapid heating.

[0039] In some preferred embodiments, Figure 6As shown, the positive pressure source 17 includes a positive pressure inert gas source 21 and a positive pressure air source 22. The positive pressure inert gas source 21, the positive pressure air source 22, and the negative pressure source 11 are connected in parallel to the end of the second connecting pipe 8 away from the second port 3. The flue gas components desorbed from the capture tube 1 are discharged from the discharge pipe 16 and then need to be analyzed and tested. To prevent the desorbed flue gas components from being contaminated by the flue gas in the capture tube 1, the flue gas in the pipe needs to be replaced before the flue gas components captured in the capture tube 1 are desorbed.

[0040] Specifically, the on-off valve 18 between the positive-pressure inert gas source 21 and the second port 3, as well as the on-off valve 18 in the exhaust pipe 16, is opened. The on-off valve 18 between the negative-pressure source 11 and the second port 3, the on-off valve 18 between the positive-pressure air source 22 and the second port 3, and the on-off valve 18 in the installation pipe 10 are closed. Flue gas in the collection pipe 1 is discharged from the exhaust pipe 16 under the action of the positive-pressure inert gas until the flue gas in the collection pipe 1 is replaced by the inert gas. At this point, the on-off valve 18 between the positive-pressure inert gas source 21 and the second port 3, as well as the on-off valve 18 in the exhaust pipe 16, are closed. Generally, the positive-pressure inert gas source 21 is high-purity nitrogen or high-purity helium, with a concentration of no less than 99.999%.

[0041] After the gas in collection tube 1 is completely replaced, the flue gas components captured in collection tube 1 are thermally desorbed. After thermal desorption is complete, the on-off valve 18 between the positive-pressure inert gas source 21 and the second port 3 and the on-off valve 18 in the exhaust pipe 16 are reopened. The on-off valve 18 between the negative-pressure source 11 and the second port 3, the on-off valve 18 between the positive-pressure air source 22 and the second port 3, and the on-off valve 18 in the installation pipe 10 remain closed. The desorbed flue gas components are then discharged from the exhaust pipe 16 under the action of the positive-pressure inert gas for analysis or collection. Mixing of the inert gas and the flue gas components will not affect the flue gas analysis results.

[0042] After thermal desorption and flue gas exhaust are complete, close the on-off valve 18 between the positive-pressure inert gas source 21 and the second port 3, while keeping the on-off valve 18 in the mounting tube 10 closed. Open the on-off valve 18 between the negative-pressure source 11 and the second port 3 and the on-off valve 18 at the positive-pressure air source 22, while keeping the on-off valve 18 in the exhaust pipe 16 open. Compressed air is introduced into the collection tube 1, simultaneously heating it to reduce the residual flue gas components on the tube wall and in the pipeline, thereby reducing interference with the next experiment's flue gas capture and detection.

[0043] In some preferred embodiments, Figure 7As shown, the cold trap capture device also includes a first connecting pipe 7, a second connecting pipe 8, and an adapter 9. The first connecting pipe 7 is connected to the first port 2 via the adapter 9, and the second connecting pipe 8 is connected to the second port 3 via the adapter 9. The exhaust pipe 16 and the installation pipe 10 are connected in parallel to the end of the first connecting pipe 7 away from the first port 2. The positive pressure source 17 and the negative pressure source 11 are also connected in parallel to the end of the second connecting pipe 8 away from the second port 3.

[0044] It should be noted that there are two ways to desorb the flue gas in the collection tube 1 of the cold trap capture method: extraction desorption and thermal desorption desorption. Extraction desorption requires the collection tube 1 to be disassembled from the first connecting tube 7 and the second connecting tube 8, and then a suitable extraction liquid is used to extract the flue gas adsorbed on the inside of the collection tube 1. The extraction liquid should be able to dissolve the component to be measured without chemically reacting with it, and should not block the spectral peaks in the analytical instrument. Thermal desorption desorption is to heat the collection tube 1 to a suitable temperature so that the flue gas components adsorbed on the inside of the collection tube 1 are desorbed from the tube wall, and the desorbed flue gas components are passed into the analytical instrument for analysis. In this embodiment, the two ends of the collection tube 1 are connected to the first connecting tube 7 and the second connecting tube 8 through an adapter 9 to facilitate the disassembly and installation of the collection tube 1. Such a design is convenient for extraction desorption on the one hand, and convenient for the inspection, maintenance and replacement of the collection tube 1 on the other hand.

[0045] In a further preferred embodiment, both the first connecting tube 7 and the second connecting tube 8 are made of polytetrafluoroethylene (PTFE) tubes, and a polytetrafluoroethylene gasket is provided in the adapter 9. PTFE has low thermal conductivity and is well suited to maintaining a stable temperature at the collection tube 1. The adapter 9 is made of stainless steel, ensuring a strong connection between the collection tube 1 and the first and second connecting tubes 7 and 8.

[0046] In addition, on-off valves 18 are also connected between the first connecting pipe 7 and the adapter 9, and between the second connecting pipe 8 and the adapter 9. Ensure that the on-off valves 18 between the first connecting pipe 7 and the adapter 9 and between the second connecting pipe 8 and the adapter 9 are closed before removing and installing the collection pipe 1, improving safety.

[0047] The second aspect of the present invention provides a cigarette smoke capture and analysis system, Figure 8 As shown, the capture and analysis system includes a control device 23, an analysis device 24, and a cigarette smoke cold trap capture device as described in any of the above embodiments. The analysis device 24 is connected to the end of the exhaust pipe 16 away from the first port 2 and analyzes the gas discharged from the exhaust pipe 16. The control device 23 is electrically connected to the vacuum pump 5, the refrigerator 6, the heat exchanger 15, and the heater 31 to control the operation of the vacuum pump 5, the refrigerator 6, the heat exchanger 15, and the heater 31.

[0048] A third aspect of the present invention provides a cigarette smoke capture and analysis method based on the above-mentioned cigarette smoke capture and analysis system. Specifically, the capture and analysis method includes the following steps: The vacuum pump 5 and the refrigerator 6 are operated to adjust the environment of the collection tube 1 to the required pressure and temperature. The filter end of the cigarette 100 to be tested is mounted on the mounting tube 10 and the cigarette 100 to be tested is ignited. Open the on-off valve 18 in the installation pipe 10 and the on-off valve 18 between the negative pressure source 11 and the second port 3, and close the on-off valve 18 in the discharge pipe 16 and the on-off valve 18 between the positive pressure source 17 and the second port 3. The negative pressure source 11 operates, causing the flue gas to flow along the flow path of the installation pipe 10 and the collection pipe 1. During this process, the collection pipe 1 captures the flue gas. After the collection process is completed, the on-off valve 18 in the installation pipe 10 and the on-off valve 18 between the negative pressure source 11 and the second port 3 are closed, and the on-off valve 18 in the discharge pipe 16 and the on-off valve 18 between the positive pressure source 17 and the second port 3 are opened. The positive pressure source 17 is in operation, discharging the flue gas in the collection pipe 1 from the discharge pipe 16 for replacement; After the replacement is completed, the switch valve 18 is closed, the analysis device 24 is connected to the discharge pipe 16, and the heat exchanger 15, the heater 31 and the refrigerator 6 are operated in coordination to adjust the ambient temperature of the collection tube 1 to the temperature required for thermal desorption; Close the on-off valve 18 in the installation pipe 10 and the on-off valve 18 between the negative pressure source 11 and the second port 3, and open the on-off valve 18 in the discharge pipe 16 and the on-off valve 18 between the positive pressure source 17 and the second port 3. The positive pressure source 17 is in operation, and the flue gas in the collection pipe 1 is discharged from the discharge pipe 16 and passed into the analysis device 24 for flue gas analysis.

[0049] Generally, when selecting cigarette samples to be tested, the cigarette samples need to be placed in a constant temperature and humidity chamber at a temperature of 22±1°C and a relative humidity of 60±3% for 48 hours.

[0050] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0051] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0052] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A cigarette smoke cold trap capture device, comprising a capture tube (1), wherein the capture tube (1) has a first port (2) and a second port (3), and is characterized in that: The cold trap capturing device further comprises: A vacuum cover (4) and a vacuum pump (5), wherein the collecting pipe (1) is placed in the vacuum cover (4), and the vacuum pump (5) is used to adjust the pressure in the vacuum cover (4); A refrigerator (6), the refrigerator (6) comprising a Stirling refrigerator and being used for steplessly adjusting the refrigeration temperature at the collecting pipe (1); A heat exchanger (15) and a heater (31), wherein the heat exchanger (15) and the heater (31) are both arranged around the outer periphery of the collecting tube (1); an exhaust pipe (16) and an installation pipe (10), wherein the exhaust pipe (16) and the installation pipe (10) are connected to the first port (2) in parallel, and an end of the installation pipe (10) away from the first port (2) is used for installing and connecting the filter end of the cigarette to be tested (100); an air source (200), the air source (200) comprising a positive pressure source (17) and a negative pressure source (11), the positive pressure source (17) and the negative pressure source (11) being connected to the second port (3) in parallel; and The switch valve (18) is provided at least in the installation pipe (10), in the discharge pipe (16), between the negative pressure source (11) and the second port (3), and between the positive pressure source (17) and the second port (3).

2. The cigarette smoke cold trap capture device according to claim 1, characterized in that: The cold trap capture device further comprises a verification capture module (12) and an on-off module (13), wherein the verification capture module (12) and the on-off module (13) are connected in parallel between the second port (3) and the gas source (200), and at most one of the verification capture module (12) and the on-off module (13) is in an open state.

3. The cigarette smoke cold trap capture device according to claim 1, characterized in that: The collecting tube (1) has an adsorbent built in.

4. The cigarette smoke cold trap capture device according to claim 1, characterized in that: An adsorption and capture module (14) is detachably mounted and connected to the mounting tube (10).

5. The cigarette smoke cold trap capture device according to claim 1, characterized in that: The heat exchanger (15) includes an oxygen-free copper plate heat exchanger (19) and a martensitic stainless steel plate heat exchanger (20); and the heater (31) is a ZVS heater.

6. The cigarette smoke cold trap capture device according to claim 5, characterized in that: The positive pressure source (17) comprises a positive pressure inert gas source (21) and a positive pressure air source (22), and the positive pressure inert gas source (21), the positive pressure air source (22) and the negative pressure source (11) are connected to the second port (3) in parallel.

7. The cigarette smoke cold trap capture device according to any one of claims 1 to 6, characterized in that: The cold trap capturing device further comprises a first connecting pipe (7), a second connecting pipe (8) and an adapter (9), wherein the first connecting pipe (7) is connected to the first port (2) via the adapter (9), and the second connecting pipe (8) is connected to the second port (3) via the adapter (9); The discharge pipe (16) and the mounting pipe (10) are connected in parallel to the end of the first connecting pipe (7) away from the first port (2), and the positive pressure source (17) and the negative pressure source (11) are connected in parallel to the end of the second connecting pipe (8) away from the second port (3).

8. The cigarette smoke cold trap capture device according to claim 7, characterized in that: The first connecting tube (7) and the second connecting tube (8) are both made of polytetrafluoroethylene tubes, and a polytetrafluoroethylene gasket is provided in the adapter (9).

9. A cigarette smoke capture and analysis system, characterized in that: The invention comprises a control device (23), an analysis device (24) and a cigarette smoke cold trap capture device according to any one of claims 1 to 8, wherein the analysis device (24) is used to connect to the end of the discharge pipe (16) away from the first port (2) and analyze the gas discharged from the discharge pipe (16), and the control device (23) is electrically connected to the vacuum pump (5), the refrigerator (6), the heat exchanger (15) and the heater (31).

10. A cigarette smoke capture and analysis method based on the cigarette smoke capture and analysis system according to claim 9, characterized in that: The capture analysis method comprises the following steps: The vacuum pump (5) and the refrigerator (6) are operated to adjust the environment of the collection tube (1) to the required pressure and temperature, the filter end of the cigarette to be tested (100) is mounted on the mounting tube (10), and the cigarette to be tested (100) is ignited; The switch valve (18) in the installation pipe (10) and the switch valve (18) between the negative pressure source (11) and the second port (3) are opened, and the switch valve (18) in the discharge pipe (16) and the switch valve (18) between the positive pressure source (17) and the second port (3) are closed. The negative pressure source (11) operates to cause the flue gas to flow along the flow path of the installation pipe (10) and the collection pipe (1). During this process, the collection pipe (1) collects the flue gas; After the capture process is completed, the switch valve (18) in the installation pipe (10) and the switch valve (18) between the negative pressure source (11) and the second port (3) are closed, and the switch valve (18) in the discharge pipe (16) and the switch valve (18) between the positive pressure source (17) and the second port (3) are opened, and the positive pressure source (17) is operated to discharge and replace the smoke in the capture pipe (1) from the discharge pipe (16); After the replacement is completed, the switch valve (18) is closed, the analysis device (24) is connected to the discharge pipe (16), and the heat exchanger (15), the heater (31) and the refrigerator (6) are operated in coordination to adjust the ambient temperature of the collection tube (1) to the temperature required for thermal desorption; The switch valve (18) in the installation pipe (10) and the switch valve (18) between the negative pressure source (11) and the second port (3) are closed, and the switch valve (18) in the discharge pipe (16) and the switch valve (18) between the positive pressure source (17) and the second port (3) are opened. The positive pressure source (17) is operated to discharge the flue gas in the collection pipe (1) from the discharge pipe (16) and pass it into the analysis device (24) for flue gas analysis.

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