Essential oil extraction device and zingiber striolatum diels essential oil extraction method thereof

Abstract

The invention provides an essential oil extraction device and an extraction method of zingiber striolatum diels essential oil. The device comprises a kettle body, a feeding pipe, a discharging pipe, a driving motor, an ultrasonic stirrer, a heating cover, a crushing mechanism, a condensing system, a negative pressure system and a collecting tank. The ultrasonic stirrer in the kettle body promotes cells to release essential oil through ultrasonic vibration, so that the extraction rate is increased. The heating cover and the spiral heat-conducting fins are arranged outside the kettle body, so that the heat exchange efficiency is improved. The crushing mechanism comprises a crushing net cylinder and a crushing motor, and raw materials are crushed by knocking crushing strips. The condensation system condenses steam through circulating cold water, and the condensation effect is enhanced through metal hollowed-out filling. The negative pressure system comprises a negative pressure tank and a negative pressure pump, and condensate flow is promoted. A heat preservation cover is arranged outside the collecting tank, and layering of essential oil and water is accelerated through warm water heating. By optimizing the extraction conditions and the technological process, the extraction efficiency and quality of the essential oil are remarkably improved, energy consumption and raw material waste are reduced, and the method has obvious economic benefits and environmental protection significance.

Description

Technical Field

[0001] The invention belongs to the field of essential oil extraction and relates to an essential oil extraction device and a method for extracting angelica sinensis essential oil. Background Art

[0002] Essential oils are widely used in the fragrance industry, cosmetics industry, and healthcare due to their unique aroma, antibacterial properties, and other health benefits. Essential oil extraction techniques mainly include steam distillation, solvent extraction, cold pressing, and supercritical carbon dioxide extraction. Among them, steam distillation is one of the most traditional and widely used techniques, especially for extracting essential oils from plant materials such as flowers, leaves, branches, and bark. This method uses water vapor to remove volatile components from plant materials and recover essential oils through condensation.

[0003] Although the steam distillation method is favored because of its simplicity and high cost-effectiveness, the existing essential oil extraction rate is low, resulting in serious waste of raw materials. And for some specific plant materials, such as Wasabia japonica, its essential oil content is low and easily degraded by heat, so the traditional distillation method often leads to low essential oil extraction rate and low raw material utilization. Wasabia japonica essential oil is a precious essential oil extracted from the rhizome of Wasabia japonica, with unique aroma and medicinal value. Its main ingredients include allyl isothiocyanate, etc., which give Wasabia japonica essential oil a variety of pharmacological activities, such as anti-inflammatory, antioxidant, antibacterial and other effects.

[0004] However, in the extraction process of angelica essential oil, since the active ingredients in angelica are extremely sensitive to temperature, high-temperature distillation may cause the decomposition of certain components in the essential oil, thereby reducing the quality and yield of the essential oil. In addition, the existing distillation technology often takes a long time to complete the extraction process, and in order to ensure the quality of the essential oil, it is often necessary to accurately control the distillation temperature and time, which poses a challenge to large-scale industrial production. Summary of the invention

[0005] The object of the present invention is to provide an essential oil extraction device and a method for extracting angelica sinensis essential oil thereof, which adopts a low-temperature negative pressure extraction method to extract the essential oil, can effectively improve the extraction rate of the essential oil, and can effectively improve the quality and quality of the essential oil.

[0006] In order to solve the above technical problems, the present invention provides an essential oil extraction device, comprising a kettle body, the upper end of the kettle body is connected with a feeding pipe, each feeding pipe is provided with a valve, the lower end of the kettle body is connected with a discharge pipe, and the discharge pipe is provided with a valve, the upper end of the kettle body is installed with a driving motor, the power output shaft of the driving motor is connected with a stirrer extending into the kettle body, a heating hood is provided on the outer side of the kettle body, the upper and lower parts of the heating hood are respectively connected with an air inlet pipe and an air outlet pipe, a feeding cylinder is upwardly provided at the edge of the upper end of the kettle body, the feeding cylinder is provided with a crushing net cylinder toward the kettle body, the feeding cylinder is connected with a feeding pipe outside the kettle body, the free end of the feeding pipe is detachably connected with a sealing cover, the free end of the feeding cylinder is installed with a crushing motor, a crushing shaft connected with the power output shaft of the crushing motor is rotatably connected in the feeding cylinder and the crushing net cylinder, and a plurality of knocking crushing bars are provided on the outer periphery of the crushing shaft;

[0007] The upper end of the kettle body is connected with an exhaust pipe, a valve is arranged on the exhaust pipe, the free end of the exhaust pipe is connected with a condensation shell, the upper and lower ends of the condensation shell are respectively connected with a water inlet pipe and a water outlet pipe, the upper part of the condensation shell is provided with an upper main channel connected with the exhaust pipe, the lower part of the condensation shell is provided with a lower main channel, a plurality of wavy condensation channels are connected between the upper main channel and the lower main channel, and the lower main channel is downwardly connected with a liquid guide pipe passing through the condensation shell;

[0008] The lower end of the liquid guiding tube is connected to a hollow negative pressure tank, and an air outlet is provided on one side of the liquid guiding tube extending into the negative pressure tank. The upper end of the negative pressure tank is connected to a negative pressure pipe, and the negative pressure pipe is connected to a negative pressure pump. The lower end of the negative pressure tank is connected to a pressure dividing cylinder which is cylindrical and perpendicular to the negative pressure tank. A rotating motor is installed at one end of the pressure dividing cylinder, and a rotating shaft connected to a power output shaft of the rotating motor is rotatably connected in the pressure dividing cylinder. A plurality of sealing baffles extending to the inner wall of the pressure dividing cylinder are arranged outwardly from the rotating shaft. The lower end of the pressure dividing cylinder is connected to a collecting tank, and a heat preservation cover is arranged on the outside of the collecting tank. The upper and lower parts of the heat preservation cover are respectively connected to a liquid inlet pipe and a liquid outlet pipe. The lower end of the collecting tank is downwardly connected to a drain pipe, and the middle part of the collecting tank is externally connected to an oil drain pipe, and valves are arranged on the drain pipe and the oil drain pipe.

[0009] The present invention is further configured such that the agitator includes a stirring shaft connected to the power output shaft of the driving motor, a mounting bar horizontally arranged at the lower end of the stirring shaft, and an ultrasonic agitator installed at the free end of the mounting bar.

[0010] The present invention is further configured such that a conductive slip ring is provided on the upper end of the kettle body and covers the stirring shaft, and the ultrasonic stirrer is electrically connected to the conductive slip ring via a cable arranged in the stirring shaft.

[0011] The present invention is further configured such that the outer wall of the kettle body is provided with spiral heat-conducting fins inside the heating cover.

[0012] The present invention is further configured such that a temperature sensor for detecting the internal temperature thereof and a pressure sensor for detecting the internal pressure thereof are provided at the upper end of the kettle body.

[0013] The present invention is further configured such that each condensation channel is provided with a metal hollow condensation filling in the form of a porous network.

[0014] The present invention also provides an essential oil extraction device, comprising the following steps:

[0015] S1. Select fresh yanghe and wash them;

[0016] S2. Place the yanghe in a well-ventilated place with not too strong sunlight to dry, so that the yanghe becomes slightly soft but still retains a certain toughness, rather than being completely brittle;

[0017] S3, cutting the dried yanghe into small pieces;

[0018] S4, adding water into the kettle through the feeding pipe, introducing steam into the heating cover through the air inlet pipe to heat the water in the kettle, and adding the cut cationic charge into the crushing net cylinder through the feeding pipe;

[0019] S5, driving the crushing shaft through the crushing motor to drive the knocking and crushing bars to rotate, so as to knock and crush the positive charge in the crushing net cylinder;

[0020] S6, the driving motor drives the stirrer to rotate, driving the water to continuously stir and pass through the crushing net cylinder, bringing out the yanghe juice in the crushing net cylinder;

[0021] S7, starting the negative pressure pump, and evacuating the kettle along the negative pressure pipe, the negative pressure tank, the liquid guide pipe, the lower main channel, the condensation channel, the upper main channel and the exhaust pipe to reduce the pressure in the kettle;

[0022] S8, the steam generated in the kettle flows into the condensation channel along the exhaust pipe, circulating cold water is introduced into the condensation shell, so that the steam is condensed into liquid in the condensation channel and flows into the negative pressure tank along the pipeline;

[0023] S9, the rotary motor drives the sealing baffle to rotate, so that the liquid flowing onto the sealing baffle rotates downward and flows into the collection tank, and two sealing baffles are always in contact with the inner wall of the pressure dividing cylinder, preventing the negative pressure pump from vacuuming the collection tank;

[0024] S10, introducing warm water into the heat-insulating cover to increase the temperature in the collecting tank and accelerate the separation of essential oil and water;

[0025] S11, draining the water in the lower layer of the collection tank through the drain pipe, and draining the essential oil in the upper layer of the collection tank through the oil drain pipe;

[0026] S12. After the extraction is completed, the discharge pipe is opened to discharge the mixed water and waste.

[0027] Further preferably, in step 2, the moisture content of the dried yanghe reaches 10%-15%.

[0028] Further preferably, in step 4, the water temperature in the kettle is controlled at 40°C-50°C.

[0029] Further preferably, in step 10, the temperature in the collection tank is controlled at 35°C-45°C.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] First, the present invention can effectively promote the rupture of plant cell walls by continuously beating and crushing the raw materials and ultrasonically stirring them during the essential oil extraction process, so that the essential oil components in the cells are more easily released. This process not only increases the extraction amount of essential oil, but also improves the extraction efficiency. The ultrasonic agitator can penetrate deep into the plant tissue by generating high-frequency vibrations, further promoting the release of essential oil components, thereby significantly improving the extraction rate of essential oil.

[0032] Secondly, the present invention adopts a low-temperature vacuum extraction method, which avoids the problem of decomposition of essential oil components caused by high temperature in the traditional high-temperature distillation process. Under the low-temperature environment, the active ingredients in the essential oil can be better retained and will not lose their original pharmacological activity due to high temperature. At the same time, the boiling point can be lowered under vacuum conditions, so that the essential oil can be extracted at a lower temperature, thereby effectively improving the quality of the essential oil.

[0033] Third, heating the condensate to a certain extent after isolating the negative pressure can accelerate the stratification process of essential oils and water. By increasing the temperature, the viscosity of water can be reduced, making the interface between oil and water clearer, thereby speeding up the stratification speed. This improvement measure not only simplifies the subsequent separation operation, but also greatly shortens the extraction cycle and improves the efficiency of the entire extraction process.

[0034] Fourth, the present invention uses metal hollow condensation filling, which can significantly increase the contact area with steam, thereby enhancing the condensation effect. The metal hollow structure provides more surface for steam condensation, ensuring that the steam can be fully transformed into liquid, avoiding the direct discharge of incompletely condensed steam, and reducing the waste of resources. This design not only improves the condensation efficiency, but also reduces energy consumption, with significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a partial cross-sectional view used to show the internal structure of the kettle;

[0037] Figure 3 It is a partial cross-sectional view used to show the internal structure of the condensation shell;

[0038] Figure 4 It is a partial cross-sectional view used to show the internal structure of the negative pressure tank and the pressure dividing cylinder;

[0039] Figure 5 It is a partial cross-sectional view used to show the internal structure of the collection tank.

[0040] Among them, 1, kettle body; 11, feeding pipe; 12, discharge pipe; 13, driving motor; 14, stirring shaft; 15, mounting bar; 16, ultrasonic stirrer; 17, conductive slip ring; 18, exhaust pipe; 19, temperature sensor; 110, pressure sensor; 2, valve; 3, heating cover; 31, spiral heat conducting fin; 32, air inlet pipe; 33, air outlet pipe; 4, feeding cylinder; 41, crushing net cylinder; 42, feeding pipe; 43, sealing cover; 44, crushing motor; 45, crushing shaft; 4 6. Knock-breaking strip; 5. Condensation shell; 51. Water inlet pipe; 52. Water outlet pipe; 53. Upper main channel; 54. Lower main channel; 55. Condensation channel; 56. Metal hollow condensation filling; 6. Liquid guide tube; 61. Negative pressure tank; 62. Air outlet; 63. Negative pressure pipe; 64. Negative pressure pump; 65. Pressure dividing cylinder; 66. Rotating motor; 67. Rotating shaft; 68. Sealing baffle; 7. Collecting tank; 71. Insulation cover; 72. Liquid inlet pipe; 73. Liquid outlet pipe; 74. Drain pipe; 75. Oil drain pipe. DETAILED DESCRIPTION

[0041] The following is a further detailed description of an essential oil extraction device and a method for extracting the essential oil of Hedera chinensis from the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the accompanying drawings represent the same or similar components.

[0042] Example 1, reference Figure 1-5 An essential oil extraction device comprises a kettle body 1, the upper end of the kettle body 1 is connected with two feeding pipes 11, each feeding pipe 11 is provided with a valve 2, the lower end of the kettle body 1 is connected with a discharge pipe 12, the discharge pipe 12 is provided with a valve 2, and the upper end of the kettle body 1 is provided with a temperature sensor 19 for detecting the internal temperature thereof and a pressure sensor 110 for detecting the internal pressure thereof. A driving motor 13 is installed at the upper end of the kettle body 1, and the power output shaft of the driving motor 13 is connected to an agitator extending into the kettle body 1. The agitator includes a stirring shaft 14 connected to the power output shaft of the driving motor 13, a mounting bar 15 horizontally arranged at the lower end of the stirring shaft 14, and two ultrasonic agitators 16 respectively installed at both ends of the mounting bar 15. A conductive slip ring 17 with a jacket of the stirring shaft 14 is arranged at the upper end of the kettle body 1. The ultrasonic agitator 16 is electrically connected to the conductive slip ring 17 through a cable arranged in the stirring shaft 14. The ultrasonic vibration of the ultrasonic agitator 16 can promote the release of essential oils from cells to improve the extraction rate of essential oils.

[0043] A heating cover 3 is arranged outside the kettle body 1, and a spiral heat-conducting fin 31 is arranged inside the heating cover 3 on the outer wall of the kettle body 1 to improve the heat exchange efficiency. The upper and lower parts of the heating cover 3 are respectively connected to an air inlet pipe 32 and an air outlet pipe 33. A feeding cylinder 4 is arranged upward at the edge of the upper end of the kettle body 1, and a crushing mesh cylinder 41 is arranged inside the kettle body 1. The crushing mesh cylinder 41 does not conflict with the rotating agitator, and the feeding cylinder 4 is connected to the outside of the kettle body 1 with a feeding pipe 42, and the free end of the feeding pipe 42 is detachably connected to a sealing cover 43, and a crushing motor 44 is installed at the free end of the feeding cylinder 4, and a crushing shaft 45 connected to the power output shaft of the crushing motor 44 is rotatably connected in the feeding cylinder 4 and the crushing mesh cylinder 41, and a plurality of knocking and crushing bars 46 are arranged on the periphery of the crushing shaft 45, and the rotating knocking and crushing bars 46 can continuously knock and crush the raw materials so that the essential oil in the cells can be fully released, and after continuous knocking, the raw materials will gradually be broken into debris and pass through the crushing mesh cylinder 41, and then enter the kettle body 1 and be discharged together with the water, and there is no need to clean the crushing mesh cylinder 41 additionally.

[0044] The upper end of the kettle body 1 is connected to an exhaust pipe 18, and a valve 2 is arranged on the exhaust pipe 18. The free end of the exhaust pipe 18 is connected to a condensation shell 5. The upper and lower ends of the condensation shell 5 are respectively connected to a water inlet pipe 51 and a water outlet pipe 52. Cold water is introduced into the condensation shell 5 through the water inlet pipe 51 and discharged from the water outlet pipe 52 to form circulating condensed water. An upper main channel 53 connected to the exhaust pipe 18 is arranged at the upper part of the condensation shell 5, and a lower main channel 54 is arranged at the lower part of the condensation shell 5. A plurality of wavy condensation channels 55 are connected between the upper main channel 53 and the lower main channel 54. A metal hollow condensation filling 56 in the shape of a porous network is arranged in each condensation channel 55. The metal hollow condensation filling 56 can fully contact with the steam, increase the heat exchange capacity with the steam, so that the steam can be fully condensed, and avoid waste caused by direct discharge of the steam due to condensation. The lower main channel 54 is downwardly connected to a liquid guide pipe 6 passing through the condensation shell 5.

[0045] The lower end of the liquid guiding tube 6 is connected to a hollow negative pressure tank 61, and an air outlet 62 is provided on one side of the liquid guiding tube 6 extending into the negative pressure tank 61. The upper end of the negative pressure tank 61 is connected to a negative pressure pipe 63, and the negative pressure pipe 63 is connected to a negative pressure pump 64. By opening an air outlet 62 on the side wall of the liquid guiding tube 6, the gas can be discharged from the air outlet 62 and sucked away by the negative pressure pump 64, and the condensed liquid continues to flow downward along the liquid guiding tube 6. The lower end of the negative pressure tank 61 is connected to a cylindrical pressure dividing cylinder 65 which is perpendicular to the pressure dividing cylinder 61. A rotating motor 66 is installed at one end of the pressure dividing cylinder 65. A rotating shaft 67 which is connected to the power output shaft of the rotating motor 66 is rotatably connected inside the pressure dividing cylinder 65. The rotating shaft 67 is provided with multiple sealing baffles 68 extending to the inner wall of the pressure dividing cylinder 65. When the rotating shaft 67 rotates, there are always at least two sealing baffles 68 in contact with the inner wall of the pressure dividing cylinder 65 to divide the pressure up and down the pressure dividing cylinder 65 to prevent the lower part of the pressure dividing cylinder 65 from being evacuated by the negative pressure pump 64. The lower end of the pressure dividing cylinder 65 is connected to a collecting tank 7, and a heat-insulating cover 71 is arranged on the outer side of the collecting tank 7. The upper and lower parts of the heat-insulating cover 71 are respectively connected to a liquid inlet pipe 72 and a liquid outlet pipe 73. The lower end of the collecting tank 7 is downwardly connected to a drain pipe 74, and the middle part of the collecting tank 7 is outwardly connected to an oil drain pipe 75. A valve 2 is arranged on the drain pipe 74 and the oil drain pipe 75. Increasing the temperature can make the solubility difference between water and oil more obvious, and usually reduce the viscosity of the liquid, especially the viscosity of water, which can make the interface between oil and water clearer, thereby accelerating the stratification speed.

[0046] Embodiment 2, based on the essential oil extraction device of embodiment 1, further provides an essential oil extraction device, comprising the following steps:

[0047] S1. Select fresh yanghe and wash them;

[0048] S2. Place the yanghe in a well-ventilated place with not too strong sunlight to dry. The moisture content of the yanghe should reach 10%-15%, so that the yanghe becomes slightly soft but still maintains a certain toughness, rather than being completely brittle.

[0049] S3, cutting the dried yanghe into small pieces;

[0050] S4, add water into the kettle body 1 through the feeding pipe 11, pass steam into the heating cover 3 through the air inlet pipe 32 to heat the water in the kettle body 1, the water temperature in the kettle body 1 is controlled at 40°C-50°C, and add the cut cationic charge into the crushing net cylinder 41 through the feeding pipe 42;

[0051] S5, the crushing motor 44 drives the crushing shaft 45 to drive the knocking crushing bar 46 to rotate, and the positive charge in the crushing net cylinder 41 is knocked and crushed;

[0052] S6, the driving motor 13 drives the stirrer to rotate, driving the water to continuously stir and pass through the crushing net cylinder 41, and taking out the Yanghe juice in the crushing net cylinder 41;

[0053] S7, start the negative pressure pump 64, and evacuate the kettle body 1 along the negative pressure pipe 63, the negative pressure tank 61, the liquid guide pipe 6, the lower main channel 54, the condensation channel 55, the upper main channel 53 and the exhaust pipe 18 to reduce the pressure in the kettle body 1;

[0054] S8, the steam generated in the kettle body 1 flows into the condensation channel 55 along the exhaust pipe 18, and circulating cold water is introduced into the condensation shell 5, so that the steam is condensed into liquid in the condensation channel 55 and flows into the negative pressure tank 61 along the pipeline;

[0055] S9, the rotating motor 66 drives the sealing baffle 68 to rotate, so that the liquid flowing onto the sealing baffle 68 rotates downward and flows into the collection tank 7, and two sealing baffles 68 are always in contact with the inner wall of the pressure dividing cylinder 65, preventing the negative pressure pump 64 from evacuating the collection tank 7;

[0056] S10, warm water is introduced into the heat preservation cover 71 to increase the temperature in the collection tank 7, and the temperature in the collection tank 7 is controlled at 35° C.-45° C. to accelerate the separation of essential oil and water;

[0057] S11, drain the water in the lower layer of the collection tank 7 through the drain pipe 74, and drain the essential oil in the upper layer of the collection tank 7 through the oil drain pipe 75;

[0058] S12, after the extraction is completed, the discharge pipe 12 will be opened to discharge the mixed water and waste.

[0059] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0060] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An essential oil extraction device, comprising a kettle (1), the upper end of the kettle (1) is connected to a feeding pipe (11), each feeding pipe (11) is provided with a valve (2), the lower end of the kettle (1) is connected to a discharge pipe (12), the discharge pipe (12) is provided with a valve (2), the upper end of the kettle (1) is installed with a drive motor (13), the power output shaft of the drive motor (13) is connected to a stirrer extending into the kettle (1), characterized in that: A heating hood (3) is arranged on the outside of the kettle body (1), and the upper and lower parts of the heating hood (3) are respectively connected with an air inlet pipe (32) and an air outlet pipe (33). A feed cylinder (4) is arranged upward at the edge of the upper end of the kettle body (1), and a crushing net cylinder (41) is arranged in the feed cylinder (4) toward the inside of the kettle body (1). The feed cylinder (4) is connected with a feed pipe (42) outside the kettle body (1), and a sealing cover (43) is detachably connected to the free end of the feed pipe (42). A crushing motor (44) is installed at the free end of the feed cylinder (4). A crushing shaft (45) connected to the power output shaft of the crushing motor (44) is rotatably connected in the feed cylinder (4) and the crushing net cylinder (41), and a plurality of knocking crushing bars (46) are arranged on the outer periphery of the crushing shaft (45); The upper end of the kettle body (1) is connected to an exhaust pipe (18), a valve (2) is provided on the exhaust pipe (18), the free end of the exhaust pipe (18) is connected to a condensation shell (5), the upper and lower ends of the condensation shell (5) are respectively connected to a water inlet pipe (51) and a water outlet pipe (52), the upper part of the condensation shell (5) is provided with an upper main channel (53) connected to the exhaust pipe (18), the lower part of the condensation shell (5) is provided with a lower main channel (54), a plurality of wavy condensation channels (55) are connected between the upper main channel (53) and the lower main channel (54), and the lower main channel (54) is downwardly connected to a liquid guide pipe (6) passing through the condensation shell (5); The lower end of the liquid guiding tube (6) is connected to a hollow negative pressure tank (61), and a gas outlet (62) is provided on one side of the liquid guiding tube (6) extending into the negative pressure tank (61). The upper end of the negative pressure tank (61) is connected to a negative pressure pipe (63), and the negative pressure pipe (63) is connected to a negative pressure pump (64). The lower end of the negative pressure tank (61) is connected to a pressure dividing cylinder (65) which is cylindrical and perpendicular to the negative pressure tank (61), and a rotating motor (66) is installed at one end of the pressure dividing cylinder (65). A rotating shaft (67) connected to the power output shaft of the rotating motor (66) is rotatably connected in the pressure dividing cylinder (65). ), the rotating shaft (67) is provided with a plurality of sealing baffles (68) extending to the inner wall of the pressure dividing cylinder (65) outwardly, the lower end of the pressure dividing cylinder (65) is connected to a collecting tank (7), a heat preservation cover (71) is provided on the outer side of the collecting tank (7), the upper and lower parts of the heat preservation cover (71) are respectively connected to a liquid inlet pipe (72) and a liquid outlet pipe (73), the lower end of the collecting tank (7) is downwardly connected to a drain pipe (74), the middle part of the collecting tank (7) is externally connected to an oil drain pipe (75), and valves (2) are provided on both the drain pipe (74) and the oil drain pipe (75).

2. An essential oil extraction device according to claim 1, characterized in that: The stirrer comprises a stirring shaft (14) connected to the power output shaft of the driving motor (13), a mounting bar (15) horizontally arranged at the lower end of the stirring shaft (14), and an ultrasonic stirrer (16) mounted on the free end of the mounting bar (15).

3. An essential oil extraction device according to claim 2, characterized in that: The upper end of the kettle body (1) is provided with a conductive slip ring (17) which is outer-coated with a stirring shaft (14); the ultrasonic stirrer (16) is electrically connected to the conductive slip ring (17) via a cable arranged in the stirring shaft (14).

4. An essential oil extraction device according to claim 1, characterized in that: The outer wall of the kettle body (1) is provided with spiral heat-conducting fins (31) inside the heating cover (3).

5. The essential oil extraction device according to claim 1, characterized in that: The upper end of the kettle body (1) is provided with a temperature sensor (19) for detecting the internal temperature thereof and a pressure sensor (110) for detecting the internal pressure thereof.

6. The essential oil extraction device according to claim 1, characterized in that: Each condensation channel (55) is provided with a metal hollow condensation filling (56) in the form of a porous network.

7. A method for extracting Hedera chinensis essential oil, based on an essential oil extraction device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Select fresh yanghe and wash them; S2. Place the yanghe in a well-ventilated place with not too strong sunlight to dry, so that the yanghe becomes slightly soft but still retains a certain toughness, rather than being completely brittle; S3, cutting the dried yanghe into small pieces; S4, adding water into the kettle (1) through the feeding pipe (11), introducing steam into the heating cover (3) through the air inlet pipe (32) to heat the water in the kettle (1), and adding the cut cationic charge into the crushing net cylinder (41) through the feeding pipe (42); S5, driving the crushing shaft (45) through the crushing motor (44) to drive the knocking and crushing bar (46) to rotate, so as to knock and crush the positive charge in the crushing net cylinder (41); S6, the driving motor (13) drives the stirrer to rotate, driving the water to continuously stir and pass through the crushing net cylinder (41), and bringing out the yanghe juice in the crushing net cylinder (41); S7, starting the negative pressure pump (64), and evacuating the kettle body (1) along the negative pressure pipe (63), the negative pressure tank (61), the liquid guide pipe (6), the lower main channel (54), the condensation channel (55), the upper main channel (53) and the exhaust pipe (18), so as to reduce the pressure in the kettle body (1); S8, the steam generated in the kettle body (1) flows into the condensation channel (55) along the exhaust pipe (18), circulating cold water is introduced into the condensation shell (5), so that the steam is condensed into liquid in the condensation channel (55), and flows into the negative pressure tank (61) along the pipeline; S9, the rotating motor (66) drives the sealing baffle (68) to rotate, so that the liquid flowing onto the sealing baffle (68) rotates downward and flows into the collection tank (7), and two sealing baffles (68) are always in contact with the inner wall of the pressure dividing cylinder (65), thereby preventing the negative pressure pump (64) from evacuating the collection tank (7); S10, introducing warm water into the heat-insulating cover (71) to increase the temperature in the collecting tank (7) and accelerate the separation of essential oil and water; S11, draining the water in the lower layer of the collection tank (7) through the drain pipe (74), and draining the essential oil in the upper layer of the collection tank (7) through the oil drain pipe (75); S12, after the extraction is completed, the discharge pipe (12) is opened to discharge the mixed water and waste.

8. The method for extracting the essential oil of Psoralea corylifolia according to claim 7, wherein: In step 2, the moisture content of the sunflower seeds is dried to 10%-15%.

9. The method for extracting the essential oil of Hedera chinensis according to claim 7, characterized in that: In step 4, the water temperature in the kettle (1) is controlled at 40°C-50°C.

10. The method for extracting the essential oil of Hedera chinensis according to claim 7, characterized in that: In step 10, the temperature in the collection tank (7) is controlled at 35°C-45°C.

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