Device for extracting volatile organic compounds in compressed tea with high efficiency and low cost

Abstract

The utility model discloses a device for extracting volatile organic compounds in compressed tea with high efficiency and low cost, and relates to the field of detection of volatile organic compounds in compressed tea, the upper surface of a mainframe box is provided with a bearing area and an air guide chamber, the bearing area is internally provided with vent holes, tea leaves are placed on the bearing area, and the air guide chamber is internally provided with an air guide fan and a temperature control heating block; spraying holes are formed in the area, corresponding to target tea leaves, of the air guide chamber, and the lower end of the heat insulation shell is sealed with the upper surface of the mainframe box and wraps the tea leaves and the air guide chamber; the upper end of the wind scooper is communicated with the vent hole, the lower end of the wind scooper is communicated with an inlet of the air draft fan, and an adsorption column is arranged in the wind scooper. The problems of high cost and relatively low efficiency of a current air exhaust mode are solved, and the volatile organic compounds in the compressed tea leaves can be efficiently and nondestructively extracted, so that the fermentation condition in the compressed tea is known.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of detection of volatile organic compounds in compacted tea, in particular to a device for efficiently and low-cost extracting volatile organic compounds in compacted tea. BACKGROUND

[0002] Tea is widely popular due to its health benefits. Chinese tea includes green tea, yellow tea, white tea, black tea, oolong tea, dark tea, and scented tea, compacted tea, tea bag, and tea powder, etc. made from the above-mentioned tea. Compacted tea belongs to reprocessed tea, and its basic process is: tea is sieved, mixed, steamed, compacted, dried, etc. to make it. Common compacted tea includes brick tea, scented brick tea, dark brick tea, green brick tea, rice brick tea, and tuocha, etc. Different types of compacted tea are compacted into blocks during processing, and all of them have different degrees of microbial fermentation. Studies have shown that the water content of tea and environmental temperature and humidity, etc. affect the growth and reproduction of microbial flora in compacted tea, thereby regulating various metabolites in compacted tea, and ultimately affecting the quality of compacted tea. Aroma is one of the core factors of compacted tea quality, and its main material basis is various volatile organic compounds. By detecting and analyzing volatile organic compounds in compacted tea, the quality of the finished product can be determined. At the same time, due to the different degrees of fermentation during the processing of compacted tea, when the process parameters such as the water content of tea and environmental temperature and humidity are abnormal, it may cause damage to the quality of tea. Therefore, by collecting and detecting volatile organic compounds produced during the fermentation process of compacted tea, it is helpful to determine whether the processing technology is normal. Gas chromatography (GC), gas chromatography mass spectrometry (GC-MS), and gas chromatography ion mobility spectrometry (GC-IMS) are commonly used methods for detecting volatile organic compounds in tea, which have the advantages of high sensitivity and accurate detection. However, since compacted tea is compact and volatile organic compounds are often inside, it is necessary to break the tea for analysis, which causes damage to the outer packaging and tea blocks of compacted tea. Based on the above problems, the volatile organic compounds can be enriched on the volatile organic compound collection sheet by using the method of air extraction, and then detected by chromatography. Specifically, the compacted tea is tightly wrapped by the outer packaging, a first through hole is formed in the upper surface of the outer packaging, a second through hole is formed in the lower surface of the outer packaging, a volatile organic compound collection sheet is filled in the first through hole and adheres to the inner wall of the first through hole, a non-woven fabric is filled in the second through hole and adheres to the inner wall of the second through hole, the lower end of the air extraction hood is connected to the upper surface of the outer packaging, the air inlet end of the air extraction equipment is sealingly connected to the air outlet end of the air extraction hood, and the air outlet end of the air extraction hood is in communication with the volatile organic compound collection sheet. However, this method has two problems: first, the outer packaging is a whole, and the fermentation process of many tea is also carried out under the condition of having outer packaging. Each outer packaging can only be used for a specific tea, which is high in cost; second, the air extraction equipment needs to run for a long time to reach the detection standard, which is low in efficiency. SUMMARY

[0003] To address the problems existing in the prior art, this utility model proposes a device for efficiently and cost-effectively extracting volatile organic compounds from compressed tea, thereby solving the problems of high cost and low efficiency of the current air extraction method. It can efficiently and non-destructively extract volatile organic compounds from compressed tea leaves. By detecting and analyzing the collected volatile organic compounds, the fermentation status inside the compressed tea can be known.

[0004] This utility model is achieved through the following technical solution:

[0005] A device for efficiently and cost-effectively extracting volatile organic compounds from compressed tea includes a main unit, a heat-insulating shell, and an air guide shroud.

[0006] The upper surface of the main unit is provided with a bearing area and an air guide chamber communicating with the inner cavity of the main unit. Ventilation holes are evenly opened in the bearing area. The bearing area is used to place the target tea. An air guide fan and a temperature control heating block are provided in the air guide chamber. Spray holes are opened in the area of ​​the air guide chamber corresponding to the target tea. The lower end of the heat insulation shell is sealed to the upper surface of the main unit and wraps the target tea and the air guide chamber.

[0007] The main unit is equipped with an exhaust fan. The upper end of the air guide shroud is connected to the ventilation hole, and the lower end is connected to the inlet of the exhaust fan. An adsorption column is arranged in the air guide shroud.

[0008] The further improvement of this utility model is as follows:

[0009] The main unit chassis has an installation port at the center of its upper surface, and a support plate is provided in the installation port. Ventilation holes are evenly distributed on the support plate.

[0010] The air guiding chamber consists of several elongated strips with rectangular cross-sections, and is evenly distributed around the target tea leaves along a direction perpendicular to the upper surface of the main unit.

[0011] The heat insulation shell is made of transparent material and is rectangular in shape. The lower end of the heat insulation shell is sealed and inserted into the outer edge of the upper surface of the main unit chassis.

[0012] The lower end of the air guide chamber is fixedly inserted into the upper surface of the main unit chassis. The lower end face of the air guide chamber is open. Air guide fans and temperature control heating blocks are arranged at intervals from bottom to top in the air guide chamber.

[0013] The air guide chamber is also equipped with an air guide grid, which is located above the temperature control heating block. The upper end face of the air guide grid is located less than one-third of the height of the air guide chamber, and the spray holes are located above the air guide grid.

[0014] The spray holes are arranged in several vertical columns and are evenly distributed along the length of the air guide chamber. The spray holes in each column are evenly distributed between the air guide grid and the upper surface of the air guide chamber.

[0015] The air guide hood includes a truncated cone section and a cylindrical section with an integral structure. The upper opening of the truncated cone section is larger than the lower opening. The inner diameter of the cylindrical section is larger than the lower opening of the truncated cone section but smaller than the upper opening of the truncated cone section. The support plate is circular, and the diameter of the support plate is the same as the inner diameter of the upper opening of the truncated cone section. The adsorption column is placed in the cylindrical section.

[0016] The opening at the upper end of the frustum corresponds to the edge of the support plate. The exhaust fan is placed in the box at the bottom center of the main unit. Airflow holes are provided on the side walls of the box. A cylindrical stepped hole is provided on the upper surface of the box at the position corresponding to the adsorption column. The lower end face of the adsorption column is located in the stepped hole. The lower end face of the cylindrical section is placed on the upper surface of the box and is spaced apart from the edge of the cylindrical stepped hole.

[0017] It also includes a cylindrical support device set between the adsorption column and the cylindrical section. The upper end of the support device is open and the lower end is provided with a vent hole. The support device is inserted between the adsorption column and the cylindrical section from bottom to top, and the lower end face of the support device is engaged in the cylindrical stepped hole.

[0018] The inner diameter of the carrier is larger than the diameter of the adsorption column, the outer diameter of the carrier is equal to the inner diameter of the cylindrical section, the height of the carrier is smaller than that of the cylindrical section, and the vent holes form a circular through-hole area at the center of the lower end of the carrier, and then the circular through-hole area and the edge of the lower end of the carrier are evenly distributed radially.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] This invention discloses a highly efficient and low-cost device for extracting volatile organic compounds (VOCs) from compressed tea. Airflow originates from the main unit, passes through a fan and is heated by a temperature-controlled heating block, then exits through spray nozzles. This heated airflow design heats and sprays the compressed tea placed on the support area without damaging the outer packaging, promoting the release of VOCs from the tea blocks by increasing the tea's temperature. The sealing between the lower end of the heat-insulating shell and the upper surface of the main unit, along with the enclosure of the target tea and the air-guiding chamber, prevents leakage of VOCs. During the exhaust fan's suction process, VOCs in the upper part are concentrated and adsorbed onto the adsorption column. The adsorbed air is then blown back into the main unit by the exhaust fan, where it is guided and heated again before being sprayed onto the target tea blocks. This process gradually raises the target tea sample to the set temperature, achieving cyclic enrichment of the tea blocks and the VOCs released from the tea. By heating the target tea block with airflow, the release of volatile organic compounds is promoted. Without affecting the appearance and integrity of the tea block, the volatile organic compounds are adsorbed onto the adsorption column using a cyclic enrichment method. This solves the problems of high cost and low efficiency of the current air extraction method. It can efficiently and cost-effectively extract volatile organic compounds from compressed tea, thus facilitating the understanding of the fermentation status inside the compressed tea block. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the device described in this utility model after removing the heat insulation shell.

[0022] Figure 2 This is a schematic diagram of the internal structure of the main unit chassis in the device described in this utility model.

[0023] Figure 3 This is a cross-sectional view of the device described in this utility model.

[0024] Figure 4 This is a cross-sectional view of the device described in this utility model from another angle.

[0025] Figure 5 for Figure 1 A schematic diagram of the structure of the central gas guide chamber.

[0026] Figure 6 for Figure 5 A cross-sectional schematic diagram.

[0027] Figure 7 for Figure 1 A schematic diagram of the carrier structure.

[0028] Figure 8 for Figure 4 A cross-sectional schematic diagram of the composite structure of the central air guide hood, adsorption column and carrier.

[0029] Figure 9for Figure 4 Cross-sectional view of the main unit chassis.

[0030] Figure 10 This is a schematic diagram of the airflow direction during operation of the device described in this utility model.

[0031] In the diagram: 101-Insulated outer shell, 102-Main unit chassis, 103-Air duct chamber, 104-Carrier plate, 105-Target tea leaves, 106-Air guide hood, 107-Adsorption column, 108-Carrier, 1021-Exhaust fan, 1022-Air duct chamber mounting hole, 1031-Spray hole, 1032-Air duct fan, 1033-Temperature control heating block, 1034-Air duct grille, 1081-Ventilation hole. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The description is for explanation and not limitation of the present invention.

[0033] This invention relates to a device for efficiently and cost-effectively extracting volatile organic compounds from compressed tea. It can specifically extract volatile organic compounds from compressed tea and circulate and enrich them in an adsorption column for easy subsequent detection.

[0034] like Figure 1 As shown, the main components of this device are the heat-insulating shell 101 and the main unit housing 102. The heat-insulating shell 101 is made of a transparent material with good heat insulation properties, such as polymethyl methacrylate or polycarbonate, and is rectangular in shape. The lower end of the heat-insulating shell 101 is sealed and inserted into the outer edge of the upper surface of the main unit housing 102, enclosing the target tea leaves 105 and the air guide chamber 103, enabling internal airflow circulation and preventing leakage of volatile organic compounds. Figure 2 As shown, the upper surface of the main unit 102 is provided with a support area and an air guide chamber 103 communicating with the inner cavity of the main unit 102. Ventilation holes are evenly distributed in the support area, and the target tea leaves 105 are placed on the support area. Specifically, an air guide chamber mounting hole 1022 for mounting the air guide chamber 103 and a mounting opening for the support plate 104 are provided at the center of the upper surface of the main unit 102. The support plate 104 is installed in the mounting opening, and ventilation holes are evenly distributed on the support plate 104. The target tea leaves 105 are placed on the support plate 104. The air guide chamber 103 is provided with an air guide fan 1032 and a temperature control heating block 1033. Multiple spray holes 1031 are provided in the area of ​​the air guide chamber 103 corresponding to the target tea leaves 105 to facilitate the spraying of the heated airflow onto the target tea leaves 105. Figure 3As shown, an exhaust fan 1021 is provided below the support plate 104 in the main unit 102 to form a circulating airflow, which facilitates the adsorption and collection of volatile organic compounds in the adsorption column 107. The upper end of the air guide shroud 106 is connected to the vent, and its lower end is connected to the inlet of the exhaust fan 1021. The adsorption column 107 is arranged in the air guide shroud 106. The adsorption column 107 is composed of a high-permeability membrane and activated carbon or resin wrapped therein.

[0035] In some specific implementation cases, there are four air guide chambers 103, which are long strips with rectangular cross-sections and are evenly distributed around the target tea leaves 105 along a direction perpendicular to the upper surface of the main unit 102.

[0036] like Figure 4 and Figure 6 As shown, the lower end of the air duct chamber 103 is fixedly inserted into the upper surface of the main unit chassis 102. The lower end face of the air duct chamber 103 is open, and air duct fans 1032 are arranged in the air duct chamber 103 from bottom to top. Figure 6 Only the fan blades are shown, along with the temperature-controlled heating block 1033. The air guide grille 1034 in the air guide chamber 103 is located above the temperature-controlled heating block 1033, with the upper surface of the grille 1034 positioned below one-third of the height of the air guide chamber 103. The spray nozzle 1031 is located above the grille 1034. (As shown...) Figure 5 As shown, the spray holes 1031 are arranged in several vertical rows and are evenly distributed along the length of the air guide chamber 103, combined with Figure 6 The spray holes 1031 in each column are evenly distributed between the air guide grille 1034 and the upper surface of the air guide chamber 103. The air guide fan 1032, the temperature control heating block 1033, and the air guide grille 1034 are integrated with the air guide chamber 103. The air guide grille 1034 can be used to collect dust and other particulate impurities, preventing them from falling onto the temperature control heating block 1033. The airflow is introduced from below 1032, heated by the temperature control heating block 1033, and then rectified by the air guide grille 1034 to form a uniform intensity. Impurities are blown up and carried out, and finally sprayed out through the spray holes 1031, similar to the function of a heater.

[0037] like Figure 8 As shown, the air guide shroud 106 includes a truncated cone section and a cylindrical section, both integrally formed. The upper opening of the truncated cone section is larger than the lower opening, and the inner diameter of the cylindrical section is larger than the lower opening of the truncated cone section but smaller than the upper opening. Correspondingly, the support plate 104 needs to be circular, with a diameter equal to the inner diameter of the upper opening of the truncated cone section. The adsorption column 107 is placed within the cylindrical section. Figure 9As shown, the upper opening of the frustum section corresponds to the edge of the support plate 104. The exhaust fan 1021 is specifically placed in the box at the bottom center of the main unit box 102. The side wall of the box has evenly opened airflow holes, and the upper surface of the box has a cylindrical stepped hole at the position corresponding to the adsorption column 107. The lower end face of the adsorption column 107 is fixed in the stepped hole. At this time, the lower end face of the cylindrical section is placed on the upper surface of the box, and a gap is left between it and the edge of the cylindrical stepped hole.

[0038] like Figure 7 As shown, the carrier 108 has an open upper end and multiple vent holes 1081 at its lower end. A portion of these vent holes form a circular through-hole area at the center of the lower end of the carrier 108, while the remaining vent holes 1081 are evenly distributed radially at intervals between this circular through-hole area and the edge of the lower end of the carrier 108. The carrier 108 is inserted between the adsorption column 107 and the cylindrical section from bottom to top. The height of the carrier 108 is less than that of the cylindrical section, so the adsorption column 107 is mounted on the carrier 108, and the lower end face of the carrier 108 engages in the cylindrical stepped hole. The inner diameter of the carrier 108 is larger than the diameter of the adsorption column 107, and the outer diameter of the carrier 108 is equal to the inner diameter of the cylindrical section, so that there is a gap between the adsorption column 107 and the carrier 108. The air guide shroud 106 is installed on the adsorption column 107 and the carrier 108 from top to bottom, forming a composite structure composed of the air guide shroud 106, the adsorption column 107 and the carrier 108 to ensure that the airflow direction is from top to bottom and that the airflow does not leak outward.

[0039] like Figure 9 and Figure 10 As shown, the exhaust fan 1021 installed inside the main unit 102 can effectively create a negative pressure environment, so that the airflow is forced from top to bottom through the air guide shroud 106 and finally enters the space inside the main unit 102 through the adsorption column 107. It is then drawn in by the air guide fan 1032 in the air guide chamber 103, heated to the specified temperature by the temperature control heating block 1033, and finally sprayed out through the spray hole 1031 to realize the circulation of internal airflow and the adsorption and collection of volatile organic compounds.

[0040] This invention relates to a device for efficiently and cost-effectively extracting volatile organic compounds from compressed tea. Taking the extraction and collection of volatile substances during the processing of wolfberry leaf Fu brick tea as an example, the specific process is as follows:

[0041] Since wolfberry leaf Fu brick tea needs to be aged at 50-60℃ after fermentation, considering both testing efficiency and tea quality, 65℃ was chosen as the extraction temperature. This temperature can effectively promote the volatilization of relevant organic matter in the tea, while also maintaining the relevant organic matter in a relatively stable state, preventing its decomposition due to excessively high temperatures.

[0042] Step 1: Take the target tea sample 105 and place it on the support tray 104, as follows. Figure 2Open the side cover of the main unit 102, assemble and install the air guide shroud 106, adsorption column 107 and carrier 108 into place, close the cover of the main unit 102, and install the heat insulation shell 101 on the outer edge of the upper surface of the main unit 102.

[0043] Step 2: Set the temperature of the temperature-controlled heating block 1033 in the air guide chamber 103 to 65°C, turn on the air guide fan 1032 and the exhaust fan 1021, and the internal circulation of the device will start. The airflow from the main unit 102 will be heated to 65°C by the air guide fan 1032 and the temperature-controlled heating block 1033. After being rectified by the air guide grid 1034, it will be sprayed out through the spray hole 1031 to heat and spray the target tea sample 105, so as to facilitate the collection of volatile organic compounds.

[0044] Step 3: The airflow forms a negative pressure through the exhaust fan 1021 and is concentrated and adsorbed by the air guide shroud 106 to the adsorption column 107. The airflow after adsorption passes through the vent 1081 provided below the carrier 108 and is blown into the host box 102 by the exhaust fan 1021.

[0045] Repeat steps 2 and 3 above. After 2-3 hours, the target tea sample 105 gradually rises to the ambient temperature of 65°C inside the device, and then the volatile organic compounds can be adsorbed and collected on the adsorption column 107 for subsequent steps.

[0046] The adsorption column was used to pretreat the sample according to the relevant GC-IMS detection pretreatment method, followed by routine content analysis. The specific operation procedure is as follows:

[0047] The adsorption column was loaded into the sample tube and placed in the thermal desorption instrument. The thermal desorption instrument was programmed with the heat trap set at 80°C and the cold trap set at -30°C, then heated to 80°C. The injection needle temperature was 85°C, the injection volume was 500 μL, and the carrier gas was high-purity N2 (purity ≥99.999%). The gas was injected into the column in splitless mode for trace analysis.

[0048] The control group's original tea samples were subjected to headspace sampling, and the specific operating procedure is as follows:

[0049] Headspace sampling: Accurately weigh 1.00 g of tea sample, place it in a 20 mL headspace vial, seal it, and inject the sample. Incubate at 80 °C and 500 r / min for 15 min. The headspace injection needle temperature is 85 °C, the injection volume is 500 μL, the carrier gas is high-purity N2 (purity ≥99.999%), and the sample enters the chromatographic column in splitless mode for trace analysis.

[0050] The extraction process of this invention collected and detected 60 kinds of volatile organic compounds, including 20 kinds of aldehydes. The traditional headspace sampling method for tea samples collected and detected 62 kinds of volatile organic compounds, including 22 kinds of aldehydes, as shown in Table 1. Among them, (Z)-4-heptenal and 2-methylpropenal were detected by the latter. The rest are shown in Table 2. This proves that this invention has better collection and detection performance.

[0051] Table 1 Aldehydes

[0052]

[0053] Table 2 Other substances

[0054]

[0055] Furthermore, to improve the collection purity of easily oxidized volatile substances, an air inlet and outlet can be opened behind the cover of the sealed main unit 102 and the heat insulation shell 101. First, a vacuum is drawn to remove air from the device, and then nitrogen is introduced. This helps easily oxidized volatile substances remain on the adsorption column 107, thereby improving the collection purity. Taking the targeted extraction of lipid compounds from compressed tea as an example, representative fats, phospholipids, glycerides, glycolipids, and thioesters are often prone to oxidation. Therefore, the nitrogen introduction method described above can be used when extracting these compounds.

Claims

1. A device for efficient and low cost extraction of volatile organic compounds from a compacted tea, characterized in that, The main box (102), the heat insulation shell (101) and the air guide cover (106) are included. The upper surface of the main box (102) is provided with a bearing area and an air guide chamber (103) communicated with the inner cavity of the main box (102), the bearing area is uniformly provided with air holes, the target tea (105) is placed on the bearing area, the air guide chamber (103) is provided with an air guide fan (1032) and a temperature control heating block (1033), the air guide chamber (103) is provided with a spray hole (1031) corresponding to the target tea (105), the lower end of the heat insulation shell (101) is sealingly arranged on the upper surface of the main box (102) and wraps the target tea (105) and the air guide chamber (103). The main box (102) is provided with an air exhaust fan (1021), the upper end of the air guide cover (106) is communicated with the air hole, the lower end is communicated with the inlet of the air exhaust fan (1021), and the air guide cover (106) is arranged with an adsorption column (107).

2. The device for efficient and low cost extraction of volatile organic compounds from a compacted tea according to claim 1, characterized in that, The center of the upper surface of the main box (102) is provided with a mounting hole, and the mounting hole is provided with a bearing disc (104), and the bearing disc (104) is uniformly provided with air holes.

3. The device for efficient and low cost extraction of volatile organic compounds from a compacted tea according to claim 2, characterized in that, The air guide chamber (103) is long strip-shaped and rectangular in cross section, and is uniformly distributed around the target tea (105) in a direction perpendicular to the upper surface of the main box (102).

4. The device for efficient and low cost extraction of volatile organic compounds from compacted tea according to claim 3, wherein, The heat insulation shell (101) is made of transparent material and is cuboid-shaped, and the lower end of the heat insulation shell (101) is sealingly inserted into the outer edge of the upper surface of the main box (102).

5. The device for efficient and low cost extraction of volatile organic compounds from compacted tea according to claim 3, wherein, The lower end of the air guide chamber (103) is fixedly inserted into the upper surface of the main box (102), the lower end surface of the air guide chamber (103) is open, and the air guide fan (1032) and the temperature control heating block (1033) are arranged in the air guide chamber (103) from bottom to top.

6. The device for efficient and low cost extraction of volatile organic compounds from a compacted tea according to claim 5, wherein, The air guide chamber (103) is further provided with an air guide grille (1034), the air guide grille (1034) is located above the temperature control heating block (1033), the upper end surface of the air guide grille (1034) is located below one third of the height of the air guide chamber (103), and the spray hole (1031) is located above the air guide grille (1034).

7. The device for efficient and low cost extraction of volatile organic compounds from a compacted tea according to claim 6, characterized in that, The spray holes (1031) are evenly distributed in each column between the air guide grille (1034) and the upper end surface of the air guide chamber (103).

8. The device for efficient and low cost extraction of volatile organic compounds from a compacted tea according to claim 6, characterized in that, The air guide cover (106) includes a circular truncated cone section and a circular cylinder section, the upper end opening of the circular truncated cone section is larger than the lower end opening, the inner diameter of the circular cylinder section is larger than the lower end opening of the circular truncated cone section and smaller than the upper end opening of the circular truncated cone section, the bearing disc (104) is circular, the diameter of the bearing disc (104) is the same as the inner diameter of the upper end opening of the circular truncated cone section, and the adsorption column (107) is placed in the circular cylinder section. The opening of the upper end of the circular truncated cone section corresponds to the edge of the bearing disc (104), the exhaust fan (1021) is placed in the box at the center of the bottom of the main box (102), the sidewall of the box is provided with air flow circulation holes, the upper surface of the box is provided with a cylindrical stepped hole at the position corresponding to the adsorption column (107), the lower end surface of the adsorption column (107) is located in the stepped hole, and the lower end surface of the circular cylinder section is placed on the upper surface of the box and is spaced from the edge of the cylindrical stepped hole.

9. The device for efficient and low cost extraction of volatile organic compounds from a compacted tea according to claim 8, characterized in that, A cylindrical bearing (108) is further arranged between the adsorption column (107) and the circular cylinder section, the upper end of the bearing (108) is open, the lower end is provided with a ventilation hole (1081), the bearing (108) is inserted between the adsorption column (107) and the circular cylinder section from bottom to top, and the lower end surface of the bearing (108) is clamped in the cylindrical stepped hole.

10. The apparatus for efficient and low cost extraction of volatile organic compounds from a compacted tea according to claim 9, wherein, The inner diameter of the bearing (108) is greater than the diameter of the adsorption column (107), the outer diameter of the bearing (108) is equal to the inner diameter of the circular cylinder section, the height of the bearing (108) is less than the circular cylinder section, the ventilation hole (1081) surrounds a circular through hole area at the center of the lower end of the bearing (108), and then is uniformly and interval distributed along the radial direction at the edge of the circular through hole area and the lower end of the bearing (108).

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