Detection device for simulating volatile organic compounds under vacuum working condition

Abstract

The invention relates to the technical field of environmental monitoring and chemical analysis, and discloses a detection device for simulating volatile organic compounds under a vacuum working condition, which comprises a fixed base placed on the ground; the vacuum structure comprises a sample part and an adjusting part, the sample part comprises a sample cabin arranged at the top of the fixed base, a vacuum cabin is fixedly mounted in the sample cabin, a first oxygen-free copper sealing ring is fixedly mounted at the top of the vacuum cabin, a protective ring plate is fixedly mounted at the top of the sample cabin, and the vacuum cabin is arranged in the protective ring plate; a second oxygen-free copper sealing ring is arranged outside the fixed base, and the second oxygen-free copper sealing ring is clamped and mounted at the top of the vacuum cabin; the adjusting part comprises a fixed bottom plate fixedly mounted at the bottom of the sample cabin, so that the purposes of adding materials and carrying out vacuum treatment are achieved, a vacuum environment simulation state is realized, the stability of material vacuum treatment is improved, the influence of an external environment is reduced, the use flexibility of the device is improved, and the device is convenient to mount and fix.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental monitoring and chemical analysis, and in particular relates to a detection device for volatile organic compounds under simulated vacuum conditions. Background Art

[0002] Volatile organic compounds are widely present in industrial waste gas, indoor air pollution and other environments, posing a serious threat to human health and the ecological environment. Traditional detection methods, such as colorimetric tube detection and gas chromatography, have limited applicability under vacuum conditions and are difficult to meet the needs of high-precision and high-efficiency detection of volatile organic compounds.

[0003] Traditional VOC detection methods, such as colorimetric tube detection and gas chromatography, have certain detection capabilities under normal conditions, but their applicability under vacuum conditions is greatly limited. Under vacuum conditions, due to the reduction in pressure, the volatility of VOCs will change significantly, which makes it difficult for traditional methods to accurately capture and quantitatively analyze VOCs. In addition, issues such as temperature control, sample handling, and the sealing of detection equipment under vacuum conditions also make high-precision and high-efficiency VOC detection particularly difficult.

[0004] What is even more difficult is that there is currently no equipment on the market that can simulate vacuum conditions and measure the VOC release patterns of larger samples (such as sealing rings with a diameter of more than 5 cm) under heating conditions. Due to the large size of such samples, the VOCs inside them may be affected by more complex physical and chemical processes during the heating process, which increases the complexity and challenge of detection. At the same time, the existing technology has bottlenecks in simulating vacuum conditions and heating to 500°C, which limits the in-depth study of the release behavior of VOCs at high temperatures.

[0005] In addition, as a commonly used volatile organic compound enrichment technology, the enrichment temperature of low-temperature enrichment traps is often not low enough to effectively enrich extremely low-boiling point volatile organic compounds. Moreover, low-temperature enrichment traps usually require fillers to enhance the enrichment effect, but these fillers may interact with the target volatile organic compounds, thereby affecting the accuracy of the detection results.

[0006] In summary, the applicability of traditional VOC detection methods under vacuum conditions is limited, and existing technologies cannot solve the problems of heating to high temperatures under vacuum conditions and the low-temperature enrichment trap enrichment temperature not being low enough. Therefore, it is particularly urgent and important to develop a device that can perform high-precision and high-efficiency VOC detection on larger samples under simulated vacuum conditions.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] In order to solve the above-mentioned technical problem of limited applicability under vacuum conditions, the basic concept of the technical solution adopted by the present invention is:

[0009] A detection device for volatile organic compounds under simulated vacuum conditions, comprising:

[0010] A fixed base, the fixed base is placed on the ground;

[0011] The vacuum structure comprises a sample part and an adjustment part. The sample part comprises a sample chamber arranged on the top of a fixed base. A vacuum chamber is fixedly installed inside the sample chamber. A first oxygen-free copper sealing ring is fixedly installed on the top of the vacuum chamber. A protective ring plate is fixedly installed on the top of the sample chamber. The vacuum chamber is arranged inside the protective ring plate. A second oxygen-free copper sealing ring is arranged outside the fixed base. The second oxygen-free copper sealing ring is snap-fitted to the top of the vacuum chamber. The adjustment part comprises a fixed bottom plate fixedly installed on the bottom of the sample chamber. A movable bottom plate is arranged at the bottom of the fixed bottom plate. Four groups of hydraulic push rods are arranged between the movable bottom plate and the fixed bottom plate. The bottom of the movable bottom plate is fixedly installed on a hydraulic cylinder. The top of the hydraulic cylinder is in close contact with the bottom of the fixed bottom plate.

[0012] As a preferred embodiment of the present invention, the sample part also includes two groups of sealing cover plates arranged on the top of the sample chamber, two groups of first limiting holes are opened on the top of the sealing cover plates, bolts are arranged inside the first limiting holes, a group of second limiting holes is opened between the two groups of sealing cover plates, and a handle is fixedly installed on the outer wall of one side of the sealing cover plates.

[0013] As a preferred embodiment of the present invention, the adjustment part also includes two groups of slide rails fixedly installed on the top of the fixed base, a limit block is fixedly installed at one end of the slide rail, a third limit hole is opened inside the slide rail, a bolt is arranged inside the third limit hole, and four groups of limit sliders are fixedly installed on the bottom of the movable bottom plate, and the limit sliders are slidably installed on the outer wall of the slide rail.

[0014] As a preferred embodiment of the present invention, four groups of fixed ring plates are fixedly installed on the top of the fixed base, a first fixed rod is fixedly installed on the top of the fixed ring plate, a first fixed block is fixedly installed on the top of the first fixed rod, a group of second fixed rods is fixedly installed between every two groups of first fixed blocks, and there are two groups of second fixed rods in total, movable blocks are slidably installed on the outer walls of the second fixed rods, and a first electric control box is fixedly installed between the two groups of movable blocks.

[0015] As a preferred embodiment of the present invention, two groups of second fixed blocks are fixedly installed on the outer wall of the second fixed rod, a first fixed plate is fixedly installed between the two groups of second fixed blocks, an electric push rod is provided on one side outer wall of the first electric control box, the movable end of the electric push rod is fixedly connected to one side outer wall of the first fixed plate, and a vacuum gauge is fixedly installed on the top of the first electric control box.

[0016] As a preferred embodiment of the present invention, two groups of first brackets are fixedly installed on the top of the fixed base, a first support plate is fixedly installed inside the first bracket, a second support plate is fixedly installed between the two groups of first brackets, a third support plate is arranged on the top of the fixed base, a group of sliders are fixedly installed at both ends of the third support plate, and the sliders are slidably installed on the top of the first bracket.

[0017] As a preferred embodiment of the present invention, a protective orifice plate is fixedly installed on the outer wall of one side of the first bracket, a group of second vacuum valves are arranged on the outer wall of one group of protective orifice plates, a third vacuum valve is arranged on the outer wall of another group of protective orifice plates, four groups of bolts are arranged on the outer walls of the second vacuum valve and the third vacuum valve, a first vacuum tube is fixedly installed on the top of the second oxygen-free copper sealing ring, the first vacuum tube is clamped and installed inside the second limiting hole, a second vacuum tube is fixedly installed on the top of the first vacuum tube, a first vacuum valve is arranged on the top of the second vacuum tube, and a valve is arranged on the outer wall of the second vacuum tube.

[0018] As a preferred embodiment of the present invention, a connecting branch is provided on the top of the first vacuum tube, a third vacuum tube is provided inside the connecting branch, two ends of the third vacuum tube are respectively fixedly connected to the inside of the second vacuum valve and the third vacuum valve, and a cold trap is provided outside the fixed base.

[0019] As a preferred embodiment of the present invention, a group of first feed pipes and a group of second feed pipes are respectively arranged on the outer walls of both sides of the cold trap, an electric control box is fixedly installed on the top of the cold trap, a switch is arranged on the outer wall of the electric control box, a heat dissipation groove is opened on the outer wall of the electric control box, a support base is arranged outside the fixed base, a vacuum pump is fixedly installed on the top of the support base, and the second feed pipe and the vacuum pump are connected to the sample cabin through pipelines.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. To achieve the purpose of adding materials and performing vacuum treatment, realize the state of vacuum environment simulation, improve the stability of material vacuum treatment, reduce the impact of external environment, improve the flexibility of device use, and facilitate installation and fixation.

[0022] 2. To achieve the purpose of rapid adjustment of the device, continuously monitor the vacuum state inside the device, ensure the stability of material processing, improve the continuity of the vacuum environment during material processing, and improve the safety of device use.

[0023] 3. The device is subjected to liquid nitrogen cold trap and auxiliary vacuum treatment to capture various gas components to the maximum extent. Since there is no filler in the trap, the internal contamination of the device is reduced, the sample loading volume is large, and all samples can be concentrated and enriched after multiple loadings and then tested at one time, thereby improving the detection sensitivity of the device and optimizing the user experience of the device.

[0024] 4. The sample chamber is connected to a dedicated vacuum pipeline, which can simulate up to 5×10 -5 Torr vacuum degree, large sample chamber capacity, can accommodate samples with a maximum diameter of 100mm and a height of 35mm, increase the volume size of the device and increase the number of test samples of the device.

[0025] 5. This system can be tested in vacuum mode or directly in purge mode. It has comprehensive functions and various test modes, which can be selected as needed to improve the convenience of using the device.

[0026] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the attached picture:

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the cold trap structure of the present invention;

[0030] Figure 3 is a schematic diagram of the structure of the second fixing rod of the present invention;

[0031] Figure 4 It is a schematic diagram of the fixed base structure of the present invention;

[0032] Figure 5 is a schematic diagram of the first bracket structure of the present invention;

[0033] Figure 6 It is a schematic diagram of the disassembly of the second oxygen-free copper sealing ring and the first oxygen-free copper sealing ring of the present invention;

[0034] Figure 7 It is a schematic diagram of the sealing cover plate structure of the present invention;

[0035] Figure 8 It is a schematic diagram of the movable bottom plate structure of the present invention.

[0036] In the figure: 10, fixed base; 11, first bracket; 12, first support plate; 13, second support plate; 14, third support plate; 15, slider; 16, slide rail; 17, limit block; 18, movable bottom plate; 19, limit slider; 20, fixed bottom plate; 21, hydraulic push rod; 22, hydraulic cylinder; 23, sample chamber; 24, handle; 25, sealing cover plate; 26, first limit hole; 27, second limit hole; 28, protective ring plate; 29, vacuum chamber; 30, first oxygen-free copper sealing ring; 31, second oxygen-free copper sealing ring; 32, first vacuum tube; 33, third limit hole; 34, second vacuum tube Empty pipe; 35. Valve; 36. First vacuum valve; 37. Connecting branch pipe; 38. Third vacuum tube; 39. Second vacuum valve; 40. Third vacuum valve; 41. Fixed ring plate; 42. First fixed rod; 43. First fixed block; 44. Second fixed rod; 45. Movable block; 46. Second fixed block; 47. First fixed plate; 48. First electric control box; 49. Electric push rod; 50. Vacuum gauge; 51. Cold trap; 52. First feed pipe; 53. Second feed pipe; 54. Electric control box; 55. Switch; 56. Heat sink; 57. Support base; 58. Vacuum pump; 59. Protective orifice plate. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0038] Embodiment 1: A device for detecting volatile organic compounds under simulated vacuum conditions, specifically Figure 1 , Figure 6 and Figure 7As shown, it includes a fixed base 10, which is placed on the ground; a vacuum structure, which includes a sample part and an adjustment part, the sample part includes a sample chamber 23 arranged on the top of the fixed base 10, a vacuum chamber 29 is fixedly installed inside the sample chamber 23, a first oxygen-free copper sealing ring 30 is fixedly installed on the top of the vacuum chamber 29, a protective ring plate 28 is fixedly installed on the top of the sample chamber 23, the vacuum chamber 29 is arranged inside the protective ring plate 28, a second oxygen-free copper sealing ring 31 is arranged outside the fixed base 10, and the second oxygen-free copper sealing ring 31 is snap-fitted and installed on the top of the vacuum chamber 29; the adjustment part includes a fixed bottom plate 20 fixedly installed on the bottom of the sample chamber 23, a movable bottom plate 18 is arranged at the bottom of the fixed bottom plate 20, four groups of hydraulic push rods 21 are arranged between the movable bottom plate 18 and the fixed bottom plate 20, the bottom of the movable bottom plate 18 is fixedly installed on the hydraulic cylinder 22, and the top of the hydraulic cylinder 22 is in close contact with the bottom of the fixed bottom plate 20. The material is processed and tested under vacuum through the vacuum structure, the material is placed inside the vacuum chamber 29, the second oxygen-free copper sealing ring 31 is placed on the top of the vacuum chamber 29, the bottom of the second oxygen-free copper sealing ring 31 is tightly attached to the top of the first oxygen-free copper sealing ring 30, the second oxygen-free copper sealing ring 31 is limitedly installed on the top of the first oxygen-free copper sealing ring 30 by bolts, the hydraulic push rod 21 is started, and the height of the fixed base plate 20 is adjusted.

[0039] Specific as Figure 1 and Figure 7 As shown, the sample part also includes two groups of sealing cover plates 25 arranged on the top of the sample chamber 23, two groups of first limiting holes 26 are opened on the top of the sealing cover plates 25, bolts are arranged inside the first limiting holes 26, a group of second limiting holes 27 is opened between the two groups of sealing cover plates 25, and a handle 24 is fixedly installed on one side of the outer wall of the sealing cover plates 25. The sealing cover plates 25 are placed on the top of the protective ring plate 28, and the bolts are rotated to install the bolts inside the first limiting holes 26, so that the sealing cover plates 25 are limited to the top of the second support plate 13, and the vacuum chamber 29 is sealed.

[0040] Specific as Figure 1 , Figure 4 and Figure 8 As shown, the adjustment part also includes two sets of slide rails 16 fixedly installed on the top of the fixed base 10, a limit block 17 is fixedly installed at one end of the slide rail 16, a third limit hole 33 is opened inside the slide rail 16, a bolt is arranged inside the third limit hole 33, and four sets of limit sliders 19 are fixedly installed at the bottom of the movable bottom plate 18, and the limit sliders 19 are slidably installed on the outer wall of the slide rail 16. Pushing the movable bottom plate 18 drives the limit sliders 19 to slide on the slide rail 16, and the limit sliders 19 are limited by the limit block 17.

[0041] According to the above, through the structure of fixed base 10, slide rail 16, limit block 17, movable bottom plate 18, limit slider 19, fixed bottom plate 20, hydraulic push rod 21, hydraulic cylinder 22, sample chamber 23, handle 24, sealing cover plate 25, first limit hole 26, second limit hole 27, protective ring plate 28, vacuum chamber 29, first oxygen-free copper sealing ring 30 and second oxygen-free copper sealing ring 31, the purpose of adding materials and performing vacuum treatment is achieved, the state of vacuum environment simulation is realized, the stability of vacuum treatment of materials is improved, the influence of external environment is reduced, the flexibility of use of the device is improved, and it is easy to install and fix.

[0042] Embodiment 2: Based on Embodiment 1, the specific Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, four groups of fixed ring plates 41 are fixedly installed on the top of the fixed base 10, a first fixed rod 42 is fixedly installed on the top of the fixed ring plate 41, a first fixed block 43 is fixedly installed on the top of the first fixed rod 42, a group of second fixed rods 44 is fixedly installed between every two groups of first fixed blocks 43, and there are two groups of second fixed rods 44 in total, and a movable block 45 is slidably installed on the outer wall of the second fixed rod 44, and a first electric control box 48 is fixedly installed between the two groups of movable blocks 45. The first fixed rod 42 and the first fixed block 43 are fixed by the fixed ring plate 41, and the first electric control box 48 is started to drive the electric push rod 49 to telescopically move.

[0043] Specific as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, two groups of second fixing blocks 46 are fixedly installed on the outer wall of the second fixing rod 44, a first fixing plate 47 is fixedly installed between the two groups of second fixing blocks 46, an electric push rod 49 is arranged on one side outer wall of the first electric control box 48, the movable end of the electric push rod 49 is fixedly connected to one side outer wall of the first fixing plate 47, and a vacuum gauge 50 is fixedly installed on the top of the first electric control box 48. The movable block 45 is driven to slide on the second fixing rod 44, the position of the vacuum gauge 50 is adjusted, and the vacuum pressure of the sample chamber 23 is monitored by the vacuum gauge 50.

[0044] According to the above conclusions, through the structure of the fixed ring plate 41, the first fixed rod 42, the first fixed block 43, the second fixed rod 44, the movable block 45, the second fixed block 46, the first fixed plate 47, the first electric control box 48, the electric push rod 49 and the vacuum gauge 50, the purpose of quickly adjusting the device is achieved, the vacuum state inside the device is continuously monitored, the stability of material processing is ensured, the continuity of the vacuum environment during material processing is improved, and the safety of device use is improved.

[0045] Embodiment 3: Based on Embodiment 1 and Embodiment 2, the specific Figure 1 , Figure 4 and Figure 5 As shown, two groups of first brackets 11 are fixedly installed on the top of the fixed base 10, a first support plate 12 is fixedly installed inside the first bracket 11, a second support plate 13 is fixedly installed between the two groups of first brackets 11, a third support plate 14 is arranged on the top of the fixed base 10, a group of sliders 15 are fixedly installed at both ends of the third support plate 14, and the sliders 15 are slidably installed on the top of the first bracket 11. The first bracket 11 is protected by a protective hole plate 59.

[0046] Specific as Figure 1 , Figure 5 and Figure 8 As shown, a protective orifice plate 59 is fixedly installed on the outer wall of one side of the first bracket 11, a group of second vacuum valves 39 are arranged on the outer wall of one group of protective orifice plates 59, a third vacuum valve 40 is arranged on the outer wall of another group of protective orifice plates 59, four groups of bolts are arranged on the outer walls of the second vacuum valve 39 and the third vacuum valve 40, a first vacuum tube 32 is fixedly installed on the top of the second oxygen-free copper sealing ring 31, the first vacuum tube 32 is clamped and installed inside the second limiting hole 27, a second vacuum tube 34 is fixedly installed on the top of the first vacuum tube 32, a first vacuum valve 36 is arranged on the top of the second vacuum tube 34, and a valve 35 is arranged on the outer wall of the second vacuum tube 34. The second vacuum valve 39 and the third vacuum valve 40 are fixedly installed on the outer wall of the protective orifice plate 59 by bolts. Open valve 35, start the first vacuum valve 36, and evacuate the interior of the sample chamber 23 through the first vacuum tube 32 and the second vacuum tube 34; start the second vacuum valve 39 and the third vacuum valve 40, and evacuate the sample chamber 23 through the third vacuum tube 38.

[0047] Specific as Figure 1 As shown, a connecting branch pipe 37 is provided on the top of the first vacuum tube 32, a third vacuum tube 38 is provided inside the connecting branch pipe 37, two ends of the third vacuum tube 38 are respectively fixedly connected to the inside of the second vacuum valve 39 and the third vacuum valve 40, and a cold trap 51 is provided outside the fixed base 10.

[0048] Specific as Figure 1 and Figure 2As shown, a group of first material delivery pipes 52 and a group of second material delivery pipes 53 are respectively arranged on the outer walls of both sides of the cold trap 51, an electric control box 54 is fixedly installed on the top of the cold trap 51, a switch 55 is arranged on the outer wall of the electric control box 54, a heat dissipation groove 56 is opened on the outer wall of the electric control box 54, a support base 57 is arranged outside the fixed base 10, a vacuum pump 58 is fixedly installed on the top of the support base 57, and the second material delivery pipe 53 and the vacuum pump 58 are connected to the sample cabin 23 through pipelines. The sample cabin 23 is connected to the second material delivery pipe 53 and the vacuum pump 58 respectively through pipelines, the sample cabin 23 is subjected to liquid nitrogen cold trap treatment through the cold trap 51, and the sample cabin 23 is vacuumized through the vacuum pump 58, and the switch 55 is pressed to power the cold trap 51 through the electric control box 54.

[0049] In summary, by fixing the base 10, the first bracket 11, the first support plate 12, the second support plate 13, the third support plate 14, the slider 15, the first vacuum tube 32, the second vacuum tube 34, the valve 35, the first vacuum valve 36, the connecting branch 37, the third vacuum tube 38, the second vacuum valve 39, the third vacuum valve 40, the cold trap 51, the first feed pipe 52, the second feed pipe 53, the electric control box 54, the switch 55, the heat dissipation groove 56, the support base 57, the vacuum pump 58 and the protective hole plate 59, the liquid nitrogen cold trap and auxiliary vacuum treatment of the device are achieved to maximize the capture of various gas components, and since there is no filler in the capture trap, the pollution inside the device is reduced, the sample loading amount is large, and all samples can be concentrated and enriched after multiple loadings and then detected at one time, thereby improving the detection sensitivity of the device and optimizing the use experience of the device.

[0050] Working principle: The fixed base 10 is placed on the ground as the foundation of the whole device. The vacuum structure includes a sample part and an adjustment part. The sample chamber 23 is arranged on the top of the fixed base 10. A vacuum chamber 29 is fixedly installed inside. A first oxygen-free copper sealing ring 30 is arranged on the top of the vacuum chamber 29. A protective ring plate 28 is arranged on the top of the sample chamber 23 to surround the vacuum chamber 29. A second oxygen-free copper sealing ring 31 is installed on the top of the vacuum chamber 29 in a snap-fit ​​manner and is tightly attached to the first oxygen-free copper sealing ring 30. The second oxygen-free copper sealing ring 31 is installed by bolt limiter. There are also two sets of sealing cover plates 25 on the top of the sample chamber 23, which are fixed to the sample chamber 23 by bolts and limiter holes. The protective ring plate 28 is further sealed to the vacuum chamber 29. The adjustment part includes a fixed bottom plate 20 and a movable bottom plate 18. There are four sets of hydraulic push rods 21 between the movable bottom plate 18 and the fixed bottom plate 20 for adjusting the height. A hydraulic cylinder 22 is fixedly installed at the bottom of the movable bottom plate 18 to provide additional support and adjustment functions. The setting of the slide rail 16 and the limit slider 19 allows the movable bottom plate 18 to slide and adjust the position on the fixed base 10. The fixed ring plate 41, the first fixed rod 42, the second fixed rod 44, etc. constitute a supporting structure. The first electric control box 48 and the electric push rod 49 are installed. The vacuum gauge 50 is adjusted to monitor the vacuum pressure of the vacuum chamber 29. The first bracket 11, the second support plate 13, the third support plate 14, etc. constitute another supporting structure. A protective hole plate 59 is installed, on which a second vacuum valve 39 and a third vacuum valve 40 are arranged for vacuuming. The vacuum tube (the first vacuum tube 32, the second vacuum tube 34) and the connecting branch pipe 37 connect the second vacuum valve 39, the third vacuum valve 40 and the first vacuum valve 36 to realize the vacuuming treatment of the sample chamber 23. The cold trap 51 is connected to the sample chamber 23 through the feed pipe for liquid nitrogen cold trap treatment. The electronic control The box 54 controls the cold trap 51; the vacuum pump 58 is also connected to the sample cabin 23 through a pipeline to perform vacuum treatment, the material is placed in the vacuum cabin 29, the second oxygen-free copper sealing ring 31 and the sealing cover plate 25 are installed and sealed, the height and position of the movable bottom plate 18 are adjusted through the hydraulic push rod 21 and the hydraulic cylinder 22, the vacuum pump 58 and the cold trap 51 are started, the sample cabin 23 is vacuumed and cold trapped through the vacuum tube and vacuum valve, the vacuum pressure of the vacuum cabin 23 is monitored using the vacuum gauge 50, the electric control box 54 controls the operation of the cold trap 51, and the switch 55 is operated. All installation accessories and corresponding gases are equipped, all pipelines are connected, and all preparations are completed.

[0051] Place the sample into the vacuum chamber 29 as required, and then place the vacuum chamber 29 as a whole into the sample chamber 23, place the first oxygen-free copper sealing ring 30 and the second oxygen-free copper sealing ring 31 in the corresponding positions, tighten with screws to seal the sample chamber 23, set the program, open or close the valves connected to the sample chamber 23, start the vacuum pump 58, start the heating of the sample chamber 23 after the vacuum is completed, and start the enrichment mode after maintaining the set temperature for the set time. During enrichment, the cold trap 51 needs to be turned on with liquid nitrogen to cool down to below -100°C and maintain the entire enrichment process. After the enrichment is completed, the detection mode is turned on, the cold trap 51 is heated to the set temperature, and the control system sends a trigger signal to the GCMS. The GCMS starts the detection, and a detection report is generated after the detection is completed, and the whole process ends.

[0052] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A device for detecting volatile organic compounds under simulated vacuum conditions, characterized in that: include: A fixed base (10), the fixed base (10) is placed on the ground; The vacuum structure comprises a sample part and an adjustment part, the sample part comprises a sample chamber (23) arranged on the top of a fixed base (10), a vacuum chamber (29) is fixedly installed inside the sample chamber (23), a first oxygen-free copper sealing ring (30) is fixedly installed on the top of the vacuum chamber (29), a protective ring plate (28) is fixedly installed on the top of the sample chamber (23), the vacuum chamber (29) is arranged inside the protective ring plate (28), and a second oxygen-free copper sealing ring (30) is fixedly installed outside the fixed base (10). 1), a second oxygen-free copper sealing ring (31) is snap-fitted and installed on the top of the vacuum chamber (29); the adjustment part comprises a fixed bottom plate (20) fixedly installed on the bottom of the sample chamber (23); a movable bottom plate (18) is arranged at the bottom of the fixed bottom plate (20); four groups of hydraulic push rods (21) are arranged between the movable bottom plate (18) and the fixed bottom plate (20); the bottom of the movable bottom plate (18) is fixedly installed on the hydraulic cylinder (22); the top of the hydraulic cylinder (22) is in close contact with the bottom of the fixed bottom plate (20).

2. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 1, characterized in that: The sample section further comprises two groups of sealing cover plates (25) arranged on the top of the sample chamber (23); two groups of first limiting holes (26) are provided on the top of the sealing cover plates (25); bolts are provided inside the first limiting holes (26); a group of second limiting holes (27) is provided between the two groups of sealing cover plates (25); and a handle (24) is fixedly mounted on an outer wall of one side of the sealing cover plates (25).

3. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 1, characterized in that: The adjustment part also includes two groups of slide rails (16) fixedly mounted on the top of the fixed base (10), a limit block (17) fixedly mounted on one end of the slide rail (16), a third limit hole (33) is provided inside the slide rail (16), a bolt is provided inside the third limit hole (33), and four groups of limit sliders (19) are fixedly mounted on the bottom of the movable bottom plate (18), and the limit sliders (19) are slidably mounted on the outer wall of the slide rail (16).

4. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 1, characterized in that: Four groups of fixed ring plates (41) are fixedly mounted on the top of the fixed base (10); a first fixed rod (42) is fixedly mounted on the top of the fixed ring plate (41); a first fixed block (43) is fixedly mounted on the top of the first fixed rod (42); a group of second fixed rods (44) is fixedly mounted between every two groups of first fixed blocks (43); there are two groups of second fixed rods (44) in total; a movable block (45) is slidably mounted on the outer wall of the second fixed rod (44); and a first electric control box (48) is fixedly mounted between the two groups of movable blocks (45).

5. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 4, characterized in that: Two groups of second fixing blocks (46) are fixedly mounted on the outer wall of the second fixing rod (44), a first fixing plate (47) is fixedly mounted between the two groups of second fixing blocks (46), an electric push rod (49) is arranged on one side outer wall of the first electric control box (48), a movable end of the electric push rod (49) is fixedly connected to one side outer wall of the first fixing plate (47), and a vacuum gauge (50) is fixedly mounted on the top of the first electric control box (48).

6. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 1, characterized in that: Two groups of first brackets (11) are fixedly mounted on the top of the fixed base (10), a first support plate (12) is fixedly mounted inside the first bracket (11), a second support plate (13) is fixedly mounted between the two groups of first brackets (11), a third support plate (14) is arranged on the top of the fixed base (10), a group of slide blocks (15) are fixedly mounted at both ends of the third support plate (14), and the slide blocks (15) are slidably mounted on the top of the first bracket (11).

7. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 6, characterized in that: A protective orifice plate (59) is fixedly mounted on an outer wall of one side of the first bracket (11); a group of second vacuum valves (39) are arranged on the outer wall of one group of protective orifice plates (59); a third vacuum valve (40) is arranged on the outer wall of another group of protective orifice plates (59); four groups of bolts are arranged on the outer walls of the second vacuum valve (39) and the third vacuum valve (40); a first vacuum tube (32) is fixedly mounted on the top of the second oxygen-free copper sealing ring (31); the first vacuum tube (32) is clamped and mounted inside the second limiting hole (27); a second vacuum tube (34) is fixedly mounted on the top of the first vacuum tube (32); a first vacuum valve (36) is arranged on the top of the second vacuum tube (34); and a valve (35) is arranged on the outer wall of the second vacuum tube (34).

8. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 7, characterized in that: A connecting branch pipe (37) is provided at the top of the first vacuum tube (32), a third vacuum tube (38) is provided inside the connecting branch pipe (37), two ends of the third vacuum tube (38) are respectively fixedly connected to the inside of the second vacuum valve (39) and the third vacuum valve (40), and a cold trap (51) is provided outside the fixed base (10).

9. The device for detecting volatile organic compounds under simulated vacuum conditions according to claim 8, characterized in that: A group of first material delivery pipes (52) and a group of second material delivery pipes (53) are respectively arranged on the outer walls of both sides of the cold trap (51); an electric control box (54) is fixedly installed on the top of the cold trap (51); a switch (55) is arranged on the outer wall of the electric control box (54); a heat dissipation groove (56) is opened on the outer wall of the electric control box (54); a support base (57) is arranged outside the fixed base (10); a vacuum pump (58) is fixedly installed on the top of the support base (57); and the second material delivery pipe (53) and the vacuum pump (58) are connected to the sample chamber (23) through pipelines.

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