Supercritical carbon dioxide extraction device and method for tea seed oil

Abstract

The invention discloses a supercritical carbon dioxide extraction device and method for tea seed oil. The extraction device comprises a kettle body, an inner cylinder and a filter, the inner cylinder is located in the kettle body, and the filter is located at an outlet of the kettle body; the filter comprises a filter shell, an inner core, a filter plate and a waved plate, the filter shell is connected to the outlet position of the kettle body, the inner core is located in the filter shell, a filter cavity is formed in the inner core, the filter plate is arranged at the lower end of the filter cavity and communicated with the outlet of the kettle body, and the waved plate is arranged in the filter cavity. A filtering outlet is formed in the upper end of the filtering cavity; the waved plate is arranged in the filtering cavity and can do reciprocating motion in the vertical direction relative to the filtering plate so as to drive the pricking needles at the end part of the waved plate to repeatedly penetrate through the filtering holes in the filtering plate. When the extraction device is used for extraction, the filter plate is not completely blocked during filtration, effective filtration work is kept, and the extraction efficiency is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of tea seed oil, and in particular to a tea seed oil supercritical carbon dioxide extraction device and an extraction method. Background Art

[0002] Tea seed oil is a high-quality, nutritious edible vegetable oil extracted from tea seeds. Tea seeds and tea have the same roots and origins. Due to its wide range of suitable growth, high economic value, and strong ecological functions, tea seeds are an excellent tree species with both good economic and ecological benefits. With the improvement of people's living standards, tea seed oil has unparalleled competitiveness and broad development prospects and market prospects due to its advantages of good oil quality, good functional characteristics, and high economic benefits of deep development.

[0003] In the prior art, tea seed oil is generally produced using supercritical carbon dioxide extraction equipment. The tea seed oil extracted by this technology has the advantages of high efficiency, low energy consumption, no pollution to the environment, high product quality, high purity, and no solvent residue. However, the following problems still exist: 1. At present, when the supercritical carbon dioxide extraction equipment is used to extract tea seed oil, in order to make the tea seed oil better dissolved in the supercritical carbon dioxide liquid, the tea seeds need to be ground into powder first. In this way, during the extraction, some tea seed powder will flow with the supercritical carbon dioxide liquid. In order to ensure the purity of the supercritical carbon dioxide liquid, a filter needs to be set at the outlet of the extraction kettle. However, during the extraction process, due to the large amount of tea seed powder, the filter will be blocked, reducing the flow rate of the supercritical carbon dioxide liquid, resulting in a decrease in the extraction efficiency. In severe cases, it may even cause blockage, and the extraction process will generate high pressure, making maintenance inconvenient; 2. At present, when supercritical carbon dioxide extraction equipment is used to extract tea seed oil, the filter is generally set at the outlet of the extraction kettle. This requires the extraction kettle to be disassembled before the filter can be replaced, cleaned and maintained, which is time-consuming and labor-intensive. Summary of the invention

[0004] In view of the above problems, the present invention proposes a tea seed oil supercritical carbon dioxide extraction device and an extraction method thereof to overcome the above problems or at least partially solve the above problems.

[0005] A tea seed oil supercritical carbon dioxide extraction device comprises a kettle body, an inner cylinder and a filter; the inner cylinder is located inside the kettle body, and the filter is located at the outlet of the kettle body; the filter comprises a filter shell, an inner core, a filter plate and a wave plate, the filter shell is connected to the outlet of the kettle body, the inner core is located inside the filter shell, a filter cavity is provided in the inner core, the filter plate is arranged at the lower end of the filter cavity and is connected to the outlet of the kettle body, and a filter outlet is provided at the upper end of the filter cavity; the wave plate is arranged in the filter cavity and can reciprocate vertically relative to the filter plate to drive the needles at the end of the wave plate to repeatedly pass through the filter holes on the filter plate.

[0006] Preferably, the filter includes a motor and a control shaft; the motor is transmission-connected to the control shaft, the control shaft adopts a crankshaft structure and is rotationally connected to the inner core, the wave plate is slidingly arranged with the inner core in a vertical direction and the upper end of the wave plate is rotationally connected to the control shaft.

[0007] Preferably, the filter is provided with a plurality of the wave plates, the control shaft is provided with a plurality of journals with different eccentricities, and the plurality of the wave plates are rotatably connected to the plurality of journals respectively.

[0008] Preferably, the filter comprises a main bevel gear and a secondary bevel gear; the main bevel gear is connected to the output shaft of the motor, the secondary bevel gear is connected to the control shaft, and the secondary bevel gear is meshingly connected to the main bevel gear.

[0009] Preferably, two filter chambers are provided in the inner core, the filter plate is provided at the lower end of each filter chamber, and the control shaft and the wave plate are provided inside the filter chamber; the inner core can rotate relative to the filter shell to alternately rotate the two filter chambers to the outlet position of the kettle body.

[0010] Preferably, the filter comprises a driving shaft, a rotating disk and a switching pin, the driving shaft is slidably sleeved on the output shaft of the motor through a flat key, the rotating disk is sleeved on the outer side of the driving shaft and can rotate relative to the driving shaft, a torsion spring is arranged between the rotating disk and the filter housing, a connecting rod is arranged on the driving shaft, and a turntable pin and an arc-shaped rotating groove are arranged on the rotating disk; a spring is arranged at the end of the driving shaft, and the spring pushes the driving shaft to move downward until the connecting rod is located on the upper surface of the rotating disk and the connecting rod is arranged in the horizontal direction abutting against the turntable pin; the switching pin is fixed on the filter housing, the free end of the switching pin is spherical and extends through the rotating groove to the upper surface of the rotating disk, the free end of the switching pin can drive the connecting rod to carry the driving shaft to overcome the spring and move upward to pass over the turntable pin and the switching pin; a ratchet and a first pawl are provided between the inner core and the rotating disk, so that the rotating disk drives the inner core to rotate unidirectionally; the central angle of the rotating groove between the turntable pin and the switching pin is equal to the central angle between the two filter chambers.

[0011] Preferably, the filter is further provided with a second pawl; the second pawl is arranged on the filter housing and connected to the ratchet to limit the unidirectional rotation of the inner core relative to the filter housing.

[0012] Preferably, a replacement cover is also provided on the filter housing, and the filter plate is detachably connected to the inner core; the inner core can rotate relative to the filter housing to transfer the filter plate to the replacement cover, and the replacement cover is detachably connected to the filter housing.

[0013] Preferably, the tea seed oil supercritical carbon dioxide extraction device also includes a push rod, a baffle and an upper cover; the push rod is fixed on the kettle body, the baffle is located above the kettle body and connected to the protruding end of the push rod, and the upper cover is connected to the downstream pipeline of the filter; the push rod can drive the baffle to move to abut or disengage with the upper cover to control the connection between the upper cover and the filter housing.

[0014] A method for supercritical carbon dioxide extraction of tea seed oil, using any of the above-mentioned supercritical carbon dioxide extraction devices for tea seed oil to perform supercritical carbon dioxide extraction of tea seed oil, specifically comprising: Step S1, loading: adding tea seed powder into the inner cylinder, inserting the inner cylinder into the kettle body, and connecting the filter at the outlet of the kettle body; Step S2, carbon dioxide modification: pressurizing the carbon dioxide by a high-pressure pump to convert the carbon dioxide into supercritical carbon dioxide liquid under pressure, and introducing the supercritical carbon dioxide liquid into the kettle and into the inner cylinder; Step S3, dissolving: controlling the temperature in the kettle body to keep the supercritical carbon dioxide liquid entering the inner cylinder in a supercritical state, and mixing and dissolving the supercritical carbon dioxide liquid and the tea seed powder; Step S4, filtering: the supercritical carbon dioxide liquid in the inner cylinder passes through the filter plate into the filter cavity and flows out through the filter outlet, and the wave plate is controlled to move back and forth in the filter cavity, driving the needle at the end of the wave plate to repeatedly pass through the filter holes on the filter plate; Step S5, separation: the filtered supercritical carbon dioxide liquid flows into a separation kettle to separate the tea seed oil; Step S6, unloading: opening the separation kettle, discharging the tea seed oil, and completing unloading.

[0015] The tea seed oil supercritical carbon dioxide extraction device of the present invention is used to extract tea seed oil supercritical carbon dioxide, which has the following beneficial technical effects: In the present invention, a filter cavity is arranged in the inner core of the filter, and a filter plate and a wave plate are arranged in the filter cavity. The wave plate is reciprocated in the vertical direction relative to the filter plate, so that the needles on the wave plate can reciprocate through the filter holes, thereby clearing the filter holes, so that the filter plate will not be completely blocked during filtering, thereby maintaining effective filtering work, ensuring extraction efficiency, and avoiding problems caused by blockage during the extraction process. In the present invention, two filter cavities are arranged in the inner core and a filter plate and a wave plate driven by a control shaft are arranged in each filter cavity, thereby forming two sets of filter devices. In this way, during the operation of the tea seed oil supercritical carbon dioxide extraction device, the two filter plates can be respectively located at Figure 2 The left and right positions shown are the working station and the cleaning station, which perform alternating filtering work to ensure the extraction efficiency, so that the extraction device can work continuously for a long time and improve the work efficiency. In the present invention, by rotating the filter plate that needs to be disassembled and replaced to the replacement cover of the cleaning station, the replacement cover can be opened to disassemble and replace the filter plate, thereby achieving rapid disassembly of the filter plate without affecting the normal operation of the extraction device, saving time and manpower required for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic cross-sectional structure diagram of the tea seed oil supercritical carbon dioxide extraction device of this embodiment; Figure 2 is a schematic cross-sectional structure diagram of the filter part in this embodiment; Figure 3 Schematic diagram of the cross-sectional structure of the kettle body in this embodiment; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction; Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction; Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure along the CC direction; Figure 7 for Figure 2 Schematic diagram of the cross-sectional structure along the DD direction; Figure 8 3D schematic diagram of the control axis in this embodiment. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] Combination Figures 1 to 8 As shown, the tea seed oil supercritical carbon dioxide extraction device of this embodiment includes a kettle body 1, an inner cylinder 2 and a filter 3. The kettle body 1 is arranged in the vertical direction, the inner cylinder 2 is located inside the kettle body 1, and the filter 3 is located at the outlet position of the upper end of the kettle body 1. The filter 3 specifically includes a filter shell 4, an inner core 5, a filter plate 6 and a wave plate 7, wherein the filter shell 4 is connected to the outlet position of the kettle body 1, the inner core 5 is located inside the filter shell 4, a filter chamber 8 is provided in the inner core 5, the filter plate 6 is arranged at the lower end of the filter chamber 8 and is connected to the outlet of the kettle body 1, and a filter outlet 9 is provided at the upper end of the filter chamber 8 for discharging the supercritical carbon dioxide passing through the filter plate 6, and then entering the downstream pipeline through the upper cover 29 connected to the filter shell 4. The wave plate 7 is arranged in the filter chamber 8 and can reciprocate in the vertical direction relative to the filter plate 6 to drive the needle at the end of the wave plate 7 to repeatedly pass through the filter holes on the filter plate 6.

[0019] In the tea seed oil supercritical carbon dioxide extraction device of the present embodiment, a filter cavity is arranged in the inner core of the filter, and a filter plate and a wave plate are arranged in the filter cavity. The wave plate is reciprocated in the vertical direction relative to the filter plate, so that the needles on the wave plate reciprocate through the filter holes, thereby clearing the filter holes, so that the filter plate will not be completely blocked during filtration, thereby maintaining effective filtration work, ensuring extraction efficiency, and avoiding problems caused by blockage during the extraction process.

[0020] Combination Figure 2 , Figure 7 and Figure 8As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, the filter 3 is also provided with a motor 10 and a control shaft 11. The motor 10 is fixed on the filter housing 4, and the motor 10 forms a transmission connection with the control shaft 11 to drive the control shaft 11 to rotate. The control shaft 11 adopts a crankshaft structure and is rotatably connected to the inner core 5. The wave plate 7 forms a sliding connection with the inner core 5 along the vertical direction, and the upper end of the wave plate 7 forms a rotation connection with the control shaft 11, that is, the wave plate 7 is rotatably connected to the inner core 5 along the vertical direction. Figure 2 The vertical direction shown is arranged in the filter cavity 8 and forms a vertical reciprocating sliding connection with the inner core 5, while the upper end of the wave plate 7 forms a rotation connection with the control shaft 11 horizontally arranged in the filter cavity 8.

[0021] At this time, by driving the control shaft to rotate through the motor, the control shaft in the form of a crankshaft can drive the wave plate to form a reciprocating movement in the vertical direction, so that the needles on the wave plate are repeatedly inserted into the filter holes of the filter plate to achieve dredging of the filter plate.

[0022] Combination Figure 2 , Figure 7 and Figure 8 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, nine corrugated plates 7 are provided in the filter 3, and nine journals with different eccentricities are provided on the control shaft 11, that is, nine journals with different distances from the rotation axis of the control shaft 11, and the nine corrugated plates 7 are respectively connected to the nine journals, thereby forming Figure 2 The connection relationship shown is that the end needles of the nine corrugated plates 7 on the control shaft 11 form an undulating arrangement relationship in a wave form.

[0023] At this time, in the process of the motor driving the control shaft to rotate, the control shaft can make multiple wave plates be inserted into the filter holes in turn, so as to clear the filter holes at different positions on the filter plate in turn. In this way, when some filter holes in the filter plate are filtering normally, some wave plates can clear the filter holes at other positions on the filter plate, so that some filter holes are filtering and some filter holes are cleared, thereby maintaining continuous filtering of the filter plate and ensuring the filtering effect of the filter plate.

[0024] Combination Figure 2 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, the filter 3 is also provided with a main bevel gear 12 and a secondary bevel gear 13. Among them, the main bevel gear 12 is connected to the output shaft of the motor 10, the secondary bevel gear 13 is connected to the control shaft 11, and the secondary bevel gear 13 is meshed and connected with the main bevel gear 12. At this time, the motor can drive the control shaft to rotate through gear transmission to dredge the filter plate.

[0025] Combination Figure 2As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, two filter chambers 8 are provided in the inner core 5, and a filter plate 6 is provided at the lower end of each filter chamber 8, and a control shaft 11 and a wave plate 7 are provided inside each filter chamber 8. At the same time, the inner core 5 can rotate relative to the filter housing 4, and the two filter chambers 8 are alternately rotated to the outlet position of the kettle body 1, that is, to Figure 2 The right filter chamber 8 is located above the inner cylinder 2 .

[0026] At this time, two filter cavities are arranged in the inner core and a filter plate and a wave plate driven by a control shaft are arranged in each filter cavity, thereby forming two sets of filter devices. In this way, during the operation of the tea seed oil supercritical carbon dioxide extraction device, the two filter plates can be respectively located at Figure 2 The left and right positions shown are the working station and the cleaning station, which form alternating filtration to ensure extraction efficiency, so that the extraction device can work continuously for a long time and improve work efficiency.

[0027] Combination Figure 2 , Figure 5 and Figure 6 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, the filter 3 is also provided with a driving shaft 14, a rotating disk 15 and a switching pin 16. The driving shaft 14 is slidably sleeved on the output shaft of the motor 10 through a flat key, the rotating disk 15 is sleeved on the outside of the driving shaft 14 and can rotate relative to the driving shaft 14, a torsion spring 17 is provided between the rotating disk 15 and the filter housing 4, and a connecting rod 18 is provided on the driving shaft 14. The connecting rod 18 is rotated along the Figure 2 The rotating disk 15 is arranged horizontally, and a rotating disk pin 19 and an arc-shaped rotating groove 20 are provided on the rotating disk 15. A spring 21 is also provided at the end of the driving shaft 14, and the spring 21 can push the driving shaft 14 to move downward until the connecting rod 18 is located on the upper surface of the rotating disk 15, so that the connecting rod 18 forms abutment with the rotating disk pin 19 in the horizontal direction, that is, Figure 2 and Figure 5 The switching pin 16 is fixed on the filter housing 4, and the upper end of the switching pin 16 is a spherical structure as a free end, and extends through the rotating groove 20 to the upper surface of the rotating disk 15 in the vertical direction, that is, Figure 2 The free end of the switching pin 16 can drive the connecting rod 18 to move the driving shaft 14 upward to overcome the spring 21, so that the connecting rod 18 can pass over the switching pin 16 and the rotating disk pin 19. A ratchet 22 and a first pawl 23 are provided between the inner core 5 and the rotating disk 15, so that the rotating disk 15 can drive the inner core 5 to rotate in one direction, that is, the rotating disk 15 can drive the inner core 5 to rotate in one direction through the first pawl 23 and the ratchet 22. Figure 6The central angle of the rotating slot 20 between the turntable pin 19 and the switching pin 16 is equal to the central angle between the two filter plates 6, which is 180 degrees.

[0028] At this time, through the arrangement of the drive shaft, the rotating disk and the switching pin, the motor can drive the drive shaft to rotate. When the drive shaft moves with the connecting rod to abut against the turntable pin, it moves to Figure 5 When the position is shown, the drive shaft can push the rotating disk to overcome the effect of the torsion spring through the contact between the connecting rod and the rotating disk pin. Figure 5 When the connecting rod moves to the switching pin, the free end of the switching pin can push the connecting rod to carry the driving shaft to overcome the force of the spring and move upward relative to the output shaft of the motor, so that the connecting rod, driven by the motor, passes over the switching pin and the turntable pin and continues to rotate, breaking away from the contact with the turntable pin, so that the rotating disk starts to move upward under the action of the restoring force of the torsion spring. Figure 5 The inner core is rotated clockwise as shown, thereby the first pawl and the ratchet teeth are used to move the inner core. Figure 6 The two filter plates rotate synchronously in the clockwise direction as shown, thereby exchanging the positions of the two filter cavities and completing the position switching of the two filter plates.

[0029] In this embodiment, since two filter cavities are provided on the inner core and the central angle between the two filter cavities is 180 degrees, the rotating disk is in a state under the restoring force of the torsion spring. Figure 5 The position shown, that is, the switching pin is located at the end of the rotating groove, and the central angle between the turntable pin and the switching pin is also 180 degrees. In this way, after the connecting rod pushes the turntable pin to move to the switching pin and passes over the turntable pin and the switching pin, the rotating disk can rotate in the opposite direction under the action of the restoring force of the torsion spring, thereby driving the inner core to rotate 180 degrees and completing the switching of the two filter chamber positions.

[0030] Combination Figure 6 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, the filter 3 is further provided with a second ratchet 24. The second ratchet 24 is rotatably arranged on the filter housing 4 through a ratchet torsion spring 41 and is connected to the ratchet 22 arranged on the inner core 5, so that the inner core 5 can rotate unidirectionally relative to the filter housing 4, even if the inner core 5 can only rotate in one direction. Figure 6 At this time, the second ratchet can further ensure that the rotating disk drives the inner core to rotate in one direction through the first ratchet.

[0031] At the same time, combined Figure 6 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, the first ratchet 23 is rotatably arranged on the rotating disk 15 through the reed 25, so that the first ratchet 23 drives the inner core 5 through the ratchet teeth 22. Figure 6 Rotate clockwise as shown.

[0032] Combination Figure 1 and Figure 7 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, a replacement cover 26 is further provided on the filter housing 4, and the filter plate 6 is detachably connected to the inner core 5. The inner core 5 can be rotated relative to the filter housing 4 to rotate the filter plate 6 to the replacement cover 26, and the replacement cover 26 is detachably connected to the filter housing 4.

[0033] In this way, the filter plate that needs to be disassembled and replaced is rotated to the replacement cover of the cleaning station through the inner core. Figure 2 When the replacement cover is in the position shown, the replacement cover can be opened to disassemble and replace the filter plate, thereby realizing rapid disassembly of the filter plate without affecting the normal operation of the extraction device.

[0034] Combination Figure 2 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, one end of the replacement cover 26 is rotatably connected to the filter housing 4, and the other end is fixed in position by a rotatably arranged locking pin 27, thereby forming a detachable connection with the filter housing 4. At the same time, the filter plate 6 is fixedly connected to the inner core 5 by a fixing ring 40, such as a retaining ring, so that the filter plate 6 can be disassembled and replaced.

[0035] Combination Figure 2 and Figure 4 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, a push rod 28 and a baffle 42 are also provided. The push rod 28 is fixed on the kettle body 1 in the vertical direction, and the baffle 42 is located above the kettle body 1 and connected to the extended end of the push rod 28, so that the push rod 28 can drive the baffle 42 to move downward to form abutment with the upper cover 29, so that the upper cover 29 is fixedly connected with the filter housing 4, or move upward to break away from the abutment with the upper cover 29, release the compression connection between the upper cover 29 and the filter housing 4, and then the filter housing 4 can be removed from the kettle body 1 to expose the inner cylinder 2.

[0036] In addition, combined Figure 2 As shown, in this embodiment, the control shaft 11 and the wave plate 7 are connected by a connecting rod 30, that is, the upper end of the connecting rod 30 is rotatably connected to the control shaft 11, and the lower end of the connecting rod 30 is hinged to the wave plate 7, so that the control shaft 11 drives the wave plate 7 to move back and forth. By setting the connecting rod, not only can the control shaft and the wave plate be protected to avoid serious wear caused by the direct connection between the wave plate and the control shaft, but also different sizes of wave plates can be quickly replaced according to the different sizes of the filter holes on the filter plate, ensuring that the needles on the wave plate can smoothly pass through the filter holes to meet the effective dredging of the filter plate.

[0037] Combination Figures 1 to 8 As shown, the method for extracting tea seed oil with supercritical carbon dioxide using the tea seed oil supercritical carbon dioxide extraction device of this embodiment specifically includes: Step S1, loading: adding tea seed powder into the inner cylinder, inserting the inner cylinder into the kettle body, and connecting the filter at the outlet position of the kettle body.

[0038] Specifically, the control push rod 28 is extended to drive the baffle 42 to rise and break away from the contact with the upper cover 29, and then the upper cover 29 is pushed upward to release the connection between the upper cover 29 and the filter housing 4, so that the filter housing 4 can be removed from the kettle body 1, and then the upper cover 29 and the upper pipe are removed, and the inner cylinder 2 can be taken out from the kettle body 1, and the tea seed powder required for preparing tea seed oil is added to the inner cylinder 2, and then the inner cylinder 2 is inserted into the kettle body 1, and the filter housing 4 and the upper cover 29 are reinstalled as shown. Figure 1 As shown above the kettle body 1, the push rod 28 is controlled to shrink, driving the baffle 42 to descend until it abuts against the upper cover 29, and the upper cover 29 is pressed and connected to the filter housing 4 again to complete the loading work.

[0039] Step S2, carbon dioxide modification: pressurize the carbon dioxide through a high-pressure pump, convert the carbon dioxide into supercritical carbon dioxide liquid under pressure, introduce it into the kettle body and enter the inner cylinder.

[0040] Specifically, after the loading is completed, the carbon dioxide bottle 31 is opened, and the high-pressure pump motor 32 is started to drive the high-pressure pump 33 to work, so as to pressurize the carbon dioxide in the pipeline, so that the carbon dioxide in the pipeline is converted into supercritical carbon dioxide liquid under the action of pressure, and the supercritical carbon dioxide liquid enters the kettle body 1 through the pipeline, and enters the inner tube 2 through the bottom plate 34 at the bottom of the kettle body 1, thereby completing the carbon dioxide modification.

[0041] Step S3, dissolving: controlling the temperature in the kettle body to keep the supercritical carbon dioxide liquid entering the inner cylinder in a supercritical state, and mixing and dissolving the supercritical carbon dioxide liquid and the tea seed powder.

[0042] Specifically, after the carbon dioxide pressurization is completed, a temperature control liquid is introduced into the temperature control tube 35 between the kettle body 1 and the inner tube 2 to control the internal temperature of the kettle body 1 so that the supercritical carbon dioxide liquid entering the inner tube 2 is maintained in a supercritical state. When the supercritical carbon dioxide liquid and the tea seed powder are mixed, the tea seed oil is dissolved in the supercritical carbon dioxide liquid to complete the dissolution work.

[0043] Step S4, filtration: the supercritical carbon dioxide liquid in the inner tube passes through the filter plate into the filter cavity and flows out through the filter outlet, and the wave plate is controlled to move back and forth in the filter cavity, driving the needles at the end of the wave plate to repeatedly pass through the filter holes on the filter plate.

[0044] Specifically, after the dissolution is completed, the supercritical carbon dioxide liquid in the inner tube 2 enters the filter housing 4, enters the filter cavity 8 of the inner core 5 through the filter plate 6, and flows out through the filter outlet 9. In this process, the motor 10 is started to drive the main bevel gear 12 to rotate, thereby driving the control shaft 11 to rotate through the secondary bevel gear 13, and then driving the wave plate 7 to move up and down in the filter cavity 8, so that the needles on the multiple wave plates 7 are inserted into the filter holes at the corresponding positions on the filter plate 6 in turn, pushing out the particles in the filter holes, and completing the dredging of the filter plate 6 without affecting the normal filtration of the filter plate 6. Among them, the wave plate 7 in the non-working position, that is, Figure 2 The wave plate 7 at the left side of the filter plate 6 can also be driven by the motor 10 to dredge the filter plate 6, so that the solid particles in the filter holes on the filter plate 6 are pushed out and fall onto the replacement cover 26, and the replacement cover 26 collects the pushed out tea liquid seed powder particles. At the same time, due to the start of the motor 10, the drive shaft 14 with the connecting rod 18 moves along with the output shaft of the motor 10. Figure 5 As shown in the figure, the connecting rod 18 rotates counterclockwise, and after the turntable pin 19 abuts against the turntable pin 19, the turntable 15 is pushed by the turntable pin 19 to overcome the force of the torsion spring 17. Figure 5 As shown, the inner core 5 rotates counterclockwise, and the inner core 5 remains stationary under the cooperation of the ratchet teeth 22, the first pawl 23 and the second pawl 24, while the switching pin 16 moves relatively along the rotating groove 20. When the inner core 5 rotates 180 degrees, the connecting rod 18 moves to the switching pin 16, and the driving shaft 14 is driven to move upward to overcome the spring 21 under the action of the switching pin 16, passing over the switching pin 16 and the turntable pin 19. The connecting rod 18 releases the contact with the turntable pin 19, and the rotating disk 15 moves upward under the restoring force of the torsion spring 17. Figure 5 The inner core 5 is driven to rotate synchronously with the cooperation of the ratchet 22, the first pawl 23 and the second pawl 24. When the inner core 5 rotates 180 degrees, the switching pin 16 moves to the end of the rotating slot 20, that is, Figure 5 The position relationship between the switching pin 16 and the rotating slot 20 is shown in the figure. The rotating disk 15 stops rotating, and the inner core 5 drives the two filter chambers 8 to rotate 180 degrees to complete the position switching, that is, the filter plate 6 is switched between the working position and the cleaning position. The connecting rod 18 that has passed the switching pin 16 moves downward to the upper surface of the rotating disk 15 again under the action of the spring 21 and continues to rotate under the drive of the motor 10. When it rotates to Figure 5 After the filter plates 6 are in the position shown, the rotating disk 15 can be pushed to rotate again by the rotating disk pin 19, so as to switch the positions of the two filter plates 6 again, and form the alternating filtering work of the two filter plates 6. In addition, when the filter plates 6 need to be disassembled and maintained, when there is no pressure inside the shutdown machine, the locking pin 27 is rotated, the replacement cover 26 is rotated to open, and the filter plates 6 are disassembled and replaced.

[0045] Step S5, separation: the filtered supercritical carbon dioxide liquid flows into a separation kettle to separate the tea seed oil.

[0046] Specifically, when the filtered supercritical carbon dioxide liquid flows into the first separation kettle 36, the carbon dioxide vaporizes and flows out due to the changes in pressure and temperature, leaving the tea seed oil in the first separation kettle 36, and the carbon dioxide gas mixed with the tea seed oil vapor enters the second separation kettle 37 for separation again, so that the carbon dioxide is purified and discharged, completing the separation work.

[0047] Step S6, unloading: open the separation kettle, discharge the tea seed oil, and complete unloading.

[0048] Specifically, after the extraction work is completed, the first solenoid valve 38 on the first separation kettle 36 and the second solenoid valve 39 on the second separation kettle 37 are opened to discharge the tea seed oil separated into the first separation kettle 36 and the second separation kettle 37 to complete the unloading.

[0049] In addition, in the above step S6, the carbon dioxide separated and discharged by the first separation kettle 36 and the second separation kettle 37 can be returned to the inlet of the high-pressure pump 33 through the pipeline for recycling.

Claims

1. A tea seed oil supercritical carbon dioxide extraction device, characterized in that: It includes a kettle body, an inner cylinder and a filter; the inner cylinder is located inside the kettle body, and the filter is located at the outlet of the kettle body; the filter includes a filter shell, an inner core, a filter plate and a wave plate, the filter shell is connected to the outlet of the kettle body, the inner core is located inside the filter shell, a filter cavity is provided in the inner core, the filter plate is arranged at the lower end of the filter cavity and is connected to the outlet of the kettle body, and a filter outlet is provided at the upper end of the filter cavity; the wave plate is arranged in the filter cavity and can reciprocate vertically relative to the filter plate to drive the needle at the end of the wave plate to repeatedly pass through the filter holes on the filter plate.

2. The tea seed oil supercritical carbon dioxide extraction device according to claim 1, characterized in that: The filter includes a motor and a control shaft; the motor is transmission-connected to the control shaft, the control shaft adopts a crankshaft structure and is rotationally connected to the inner core, the wave plate is slidingly arranged with the inner core in a vertical direction and the upper end of the wave plate is rotationally connected to the control shaft.

3. The tea seed oil supercritical carbon dioxide extraction device according to claim 2, characterized in that: The filter is provided with a plurality of wave plates, the control shaft is provided with a plurality of journals with different eccentricities, and the plurality of wave plates are rotatably connected to the plurality of journals respectively.

4. The tea seed oil supercritical carbon dioxide extraction device according to claim 2, characterized in that: The filter comprises a main bevel gear and a secondary bevel gear; the main bevel gear is connected to the output shaft of the motor, the secondary bevel gear is connected to the control shaft, and the secondary bevel gear is meshedly connected to the main bevel gear.

5. The tea seed oil supercritical carbon dioxide extraction device according to claim 2, characterized in that: Two filter chambers are provided in the inner core, the filter plate is provided at the lower end of each filter chamber, and the control shaft and the wave plate are provided inside the filter chamber; the inner core can rotate relative to the filter shell to alternately rotate the two filter chambers to the outlet position of the kettle body.

6. The tea seed oil supercritical carbon dioxide extraction device according to claim 5, characterized in that: The filter comprises a driving shaft, a rotating disk and a switching pin, wherein the driving shaft is slidably sleeved on the output shaft of the motor through a flat key, the rotating disk is sleeved on the outer side of the driving shaft and can rotate relative to the driving shaft, a torsion spring is arranged between the rotating disk and the filter housing, a connecting rod is arranged on the driving shaft, and a rotating disk pin and an arc-shaped rotating groove are arranged on the rotating disk; a spring is arranged at the end of the driving shaft, and the spring pushes the driving shaft to move downward until the connecting rod is located on the upper surface of the rotating disk and the connecting rod abuts against the rotating disk pin in the horizontal direction; the switching pin is fixed on the filter housing, the free end of the switching pin is a spherical surface and extends through the rotating groove to the upper surface of the rotating disk, and the free end of the switching pin can drive the connecting rod to move upward with the driving shaft to overcome the spring and pass over the rotating disk pin and the switching pin; a ratchet and a first pawl are arranged between the inner core and the rotating disk, so that the rotating disk drives the inner core to rotate unidirectionally; the central angle of the rotating groove between the rotating disk pin and the switching pin is equal to the central angle between the two filter chambers.

7. The tea seed oil supercritical carbon dioxide extraction device according to claim 6, characterized in that: The filter is further provided with a second pawl; the second pawl is arranged on the filter housing and connected with the ratchet to limit the inner core from rotating in one direction relative to the filter housing.

8. The tea seed oil supercritical carbon dioxide extraction device according to claim 1, characterized in that: The filter housing is also provided with a replacement cover, and the filter plate is detachably connected to the inner core; the inner core can rotate relative to the filter housing to transfer the filter plate to the replacement cover, and the replacement cover is detachably connected to the filter housing.

9. The tea seed oil supercritical carbon dioxide extraction device according to claim 1, characterized in that: The tea seed oil supercritical carbon dioxide extraction device also includes a push rod, a baffle and an upper cover; the push rod is fixed on the kettle body, the baffle is located above the kettle body and connected to the extended end of the push rod, and the upper cover is connected to the downstream pipeline of the filter; The push rod can drive the baffle to move to abut against or disengage from the upper cover, so as to control the connection between the upper cover and the filter housing.

10. A method for extracting tea seed oil using supercritical carbon dioxide, characterized in that: The tea seed oil supercritical carbon dioxide extraction device according to any one of claims 1 to 9 is used to perform tea seed oil supercritical carbon dioxide extraction, specifically comprising: Step S1, loading: adding tea seed powder into the inner cylinder, inserting the inner cylinder into the kettle body, and connecting the filter at the outlet of the kettle body; Step S2, carbon dioxide modification: pressurizing the carbon dioxide by a high-pressure pump to convert the carbon dioxide into supercritical carbon dioxide liquid under pressure, and introducing the supercritical carbon dioxide liquid into the kettle and into the inner cylinder; Step S3, dissolving: controlling the temperature in the kettle body to keep the supercritical carbon dioxide liquid entering the inner cylinder in a supercritical state, and mixing and dissolving the supercritical carbon dioxide liquid and the tea seed powder; Step S4, filtering: the supercritical carbon dioxide liquid in the inner cylinder passes through the filter plate into the filter cavity and flows out through the filter outlet, and the wave plate is controlled to move back and forth in the filter cavity, driving the needle at the end of the wave plate to repeatedly pass through the filter holes on the filter plate; Step S5, separation: the filtered supercritical carbon dioxide liquid flows into a separation kettle to separate the tea seed oil; Step S6, unloading: opening the separation kettle, discharging the tea seed oil, and completing unloading.

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