An apparatus and method for supercritical carbon dioxide extraction of tea seed oil

Abstract

The present invention discloses a supercritical carbon dioxide extraction device and an extraction method for tea seed oil. The extraction device 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 position of the kettle body; the filter includes a filter housing, an inner core, a filter plate and a corrugated plate. The filter housing is connected to the outlet position of the kettle body, the inner core is located inside the filter housing, a filter cavity is provided 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 a filter outlet is provided at the upper end of the filter cavity; the corrugated plate is arranged in the filter cavity and can reciprocate vertically relative to the filter plate to drive the thorn needles at the end of the corrugated plate to repeatedly pass through the filter holes on the filter plate. When the extraction device is used for extraction, the filter plate can be prevented from being completely blocked during filtration, the effective filtration work can be maintained, and the extraction efficiency can be guaranteed.

Description

Technical Field

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

[0002] Tea seed oil is a high-quality and nutritious edible vegetable oil extracted from tea seeds. Tea seeds and tea plants share the same root and origin. Due to their wide suitable growth range, high economic value, and strong ecological functions, they 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 due to its good oil quality, excellent functional characteristics, and high economic benefits from in-depth development, and has broad development and market prospects.

[0003] In the prior art, generally, supercritical carbon dioxide extraction equipment is used for the production of tea seed oil. The tea seed oil extracted by this technology has the advantages of high efficiency, low energy consumption, no environmental pollution, high product quality, high purity, and no solvent residue. However, there are still the following problems:

[0004] 1. Currently, when the supercritical carbon dioxide extraction equipment is used for tea seed oil extraction, in order to make the tea seed oil better dissolve in the supercritical carbon dioxide liquid, the tea seeds need to be ground into powder first. In this way, during the extraction process, some tea seed powder will flow with the supercritical carbon dioxide liquid. 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 screen 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 generates high pressure, making maintenance inconvenient;

[0005] 2. Currently, when the supercritical carbon dioxide extraction equipment is used for tea seed oil extraction, the filter screen is generally set at the outlet of the extraction kettle, which makes it necessary to disassemble the extraction kettle to replace, clean, and maintain the filter screen, which is time-consuming and laborious. Summary of the Invention

[0006] In view of the above problems, the present invention provides a supercritical carbon dioxide extraction device and an extraction method for tea seed oil to overcome or at least partially solve the above problems.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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:

[0017] 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;

[0018] 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;

[0019] Step S3, Dissolution: Control the temperature inside the kettle body to keep the supercritical carbon dioxide liquid entering the inner cylinder in a supercritical state, and mix and dissolve the supercritical carbon dioxide liquid and tea seed powder.

[0020] Step S4, Filtration: The supercritical carbon dioxide liquid in the inner cylinder passes through the filter plate into the filter chamber and flows out through the filter outlet. Control the corrugated plate to reciprocate in the filter chamber, driving the thorns at the end of the corrugated plate to repeatedly pass through the filter holes on the filter plate.

[0021] Step S5, Separation: The filtered supercritical carbon dioxide liquid flows into the separation kettle to separate the tea seed oil.

[0022] Step S6, Discharging: Open the separation kettle to discharge the tea seed oil and complete the discharging.

[0023] Using the supercritical carbon dioxide extraction device for tea seed oil of the present invention to perform supercritical carbon dioxide extraction of tea seed oil has the following beneficial technical effects:

[0024] In the present invention, by arranging a filter chamber in the inner core of the filter, and arranging a filter plate and a corrugated plate in the filter chamber, and using the reciprocating movement of the corrugated plate relative to the filter plate in the vertical direction, the thorns on the corrugated plate can reciprocally pass through the filter holes, thereby dredging the filter holes, so that the filter plate will not be completely blocked during filtration, maintaining effective filtration work, ensuring the extraction efficiency, and avoiding problems caused by blockage during the extraction process.

[0025] In the present invention, by arranging two filter chambers in the inner core and respectively arranging a filter plate and a corrugated plate driven by a control shaft in each filter chamber, two sets of filtering devices are formed. In this way, during the operation of the supercritical carbon dioxide extraction device for tea seed oil, the two filter plates can be respectively located at Figure 2 the left and right positions shown, namely the working station and the cleaning station, to perform alternating filtration work, ensuring the extraction efficiency, enabling the extraction device to work continuously for a long time, and improving the work efficiency.

[0026] In the present invention, by rotating the filter plate that needs to be disassembled and replaced to the replacement cover at the cleaning station, the replacement cover can be opened to disassemble and replace the filter plate, realizing the quick disassembly of the filter plate without affecting the normal operation of the extraction device, and saving the time and labor required for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic cross-sectional structure diagram of the supercritical carbon dioxide extraction device for tea seed oil of this embodiment;

[0028] Figure 2 Schematic cross-sectional structure diagram of the filter part in this embodiment;

[0029] Figure 3 Schematic cross-sectional structure diagram of the kettle body part in this embodiment;

[0030] Figure 4 is Figure 2 Schematic cross-sectional structure diagram along the A-A direction in

[0031] Figure 5 is Figure 2 Schematic cross-sectional structure diagram along the B-B direction in

[0032] Figure 6 is Figure 2 Schematic cross-sectional structure diagram along the C-C direction in

[0033] Figure 7 is Figure 2 Schematic cross-sectional structure diagram along the D-D direction in

[0034] Figure 8 3D schematic diagram of the control shaft in this embodiment. Detailed implementation manners

[0035] The technical solutions of the present invention will be further introduced in detail below in conjunction with the accompanying drawings and embodiments.

[0036] In combination with Figures 1 to 8 As shown, the supercritical carbon dioxide extraction device for tea seed oil in this embodiment includes a kettle body 1, an inner cylinder 2, and a filter 3. The kettle body 1 is arranged vertically, the inner cylinder 2 is located inside the kettle body 1, and the filter 3 is located at the outlet position in the upper middle of the kettle body 1. The filter 3 specifically includes a filter housing 4, an inner core 5, a filter plate 6, and a corrugated plate 7. Among them, the filter housing 4 is connected to the outlet position of the kettle body 1, the inner core 5 is located inside the filter housing 4, a filter cavity 8 is provided in the inner core 5, the filter plate 6 is arranged at the lower end of the filter cavity 8 and forms a connection with the outlet of the kettle body 1, and a filter outlet 9 is provided at the upper end of the filter cavity 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 housing 4. The corrugated plate 7 is arranged in the filter cavity 8 and can reciprocate vertically relative to the filter plate 6 to drive the thorns at the end of the corrugated plate 7 to repeatedly pass through the filter holes on the filter plate 6.

[0037] In the tea seed oil supercritical carbon dioxide extraction device of this embodiment, by arranging a filter cavity in the inner core of the filter, and arranging a filter plate and a corrugated plate in the filter cavity, and using the reciprocating movement of the corrugated plate relative to the filter plate in the vertical direction, the thorns on the corrugated plate pass through the filter holes reciprocally, thereby dredging the filter holes, so that the filter plate will not be completely blocked during filtration, maintaining effective filtration work, ensuring the extraction efficiency, and avoiding problems caused by blockage during the extraction process.

[0038] Combined with Figure 2 , Figure 7 and Figure 8 As 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. Among them, the motor 10 is fixed on the filter housing 4, and the motor 10 is in 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 corrugated plate 7 is slidably connected to the inner core 5 in the vertical direction. At the same time, the upper end of the corrugated plate 7 is rotatably connected to the control shaft 11, that is, the corrugated plate 7 is arranged in the filter cavity 8 in the vertical direction as shown in Figure 2 and forms a reciprocating sliding connection with the inner core 5 in the vertical direction, while the upper end of the corrugated plate 7 is rotatably connected to the control shaft 11 horizontally arranged in the filter cavity 8.

[0039] At this time, by driving the control shaft to rotate by the motor, the corrugated plate can be reciprocally moved in the vertical direction with the help of the control shaft in the form of a crankshaft, so that the thorns on the corrugated plate are repeatedly inserted into the filter holes of the filter plate, realizing the dredging of the filter plate.

[0040] Combined with Figure 2 , Figure 7 and Figure 8 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, there are nine corrugated plates 7 in the filter 3, and there are nine journal necks with different eccentric distances on the control shaft 11, that is, nine journal necks with different distances from the rotation axis of the control shaft 11, and the nine corrugated plates 7 are respectively connected to the nine journal necks, thus forming Figure 2 the connection relationship shown, that is, the end thorns of the nine corrugated plates 7 on the control shaft 11 are arranged in a wave-like undulating relationship.

[0041] At this time, during the process of driving the control shaft to rotate by the motor, the control shaft can insert multiple corrugated plates into the filter holes in sequence, forming sequential dredging of the filter holes at different positions on the filter plate. In this way, when some filter holes in the filter plate are filtering normally, some corrugated plates can dredge the filter holes at other positions on the filter plate, forming some filter holes for filtration and some filter holes being dredged, so as to maintain the continuous filtration of the filter plate and ensure the filtration effect of the filter plate.

[0042] Combined 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 to 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.

[0043] Combined Figure 2 As 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, a filter plate 6 is provided at the lower end of each filter chamber 8, and a control shaft 11 and a corrugated 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 to alternately rotate the two filter chambers 8 to the outlet position of the kettle body 1, that is, rotate to Figure 2 the position of the right filter chamber 8 and be located above the inner cylinder 2.

[0044] At this time, by providing two filter chambers in the inner core and respectively providing filter plates and corrugated plates driven by the control shaft in each filter chamber, two groups of filtering devices are formed. 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, that is, the working station and the cleaning station, to form an alternating filtration, ensuring the extraction efficiency, enabling the extraction device to work continuously for a long time, and improving the work efficiency.

[0045] Combined 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 drive shaft 14, a rotating disk 15 and a switching pin 16. Among them, the drive shaft 14 is sleeved on the output shaft of the motor 10 through a flat key and can slide, the rotating disk 15 is sleeved outside the drive shaft 14 and can rotate relative to the drive shaft 14, a torsion spring 17 is provided between the rotating disk 15 and the filter housing 4, a connecting rod 18 is provided on the drive shaft 14, and the connecting rod 18 is arranged along Figure 2 the horizontal direction shown. A turntable 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 drive shaft 14, and the spring 21 can push the drive shaft 14 downward until the connecting rod 18 is located on the upper surface of the rotating disk 15, so that the connecting rod 18 forms an abutment with the turntable pin 19 along the horizontal direction, that is, as shown in Figure 2 and Figure 5 the positional relationship shown. The switching pin 16 is fixed on the filter housing 4, the upper end of the switching pin 16 is a free end with a spherical structure form, and it extends through the rotating groove 20 in the vertical direction to the upper surface of the rotating disk 15, that isFigure 2 the state shown, and the free end of the switching pin 16 can drive the connecting rod 18 to drive the drive shaft 14 to move upward against the spring 21, so that the connecting rod 18 can cross over the switching pin 16 and the turntable pin 19. There are ratchet teeth 22 and a first pawl 23 between the inner core 5 and the rotating disk 15, enabling the rotating disk 15 to drive the inner core 5 to rotate unidirectionally, that is, the rotating disk 15 can drive the inner core 5 through the first pawl 23 and the ratchet teeth 22 to perform Figure 6 the clockwise rotation shown. The 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, both being 180 degrees.

[0046] At this time, through the settings of the drive shaft, the rotating disk, and the switching pin, the motor can drive the drive shaft to rotate. When the drive shaft drives the connecting rod to move to abut against the turntable pin, that is, when it moves to the Figure 5 position shown, the drive shaft can push the rotating disk to rotate counterclockwise against the action of the torsion spring through the abutment of the connecting rod and the turntable pin. Under the connection of the first pawl and the ratchet teeth, the rotating disk rotates relative to the inner core, and the switching pin moves relatively along the rotating slot. When the connecting rod moves to the switching pin, the free end of the switching pin can push the connecting rod to drive the drive shaft to move upward relative to the output shaft of the motor against the acting force of the spring, so that the connecting rod can continue to rotate beyond the switching pin and the turntable pin under the drive of the motor, disengaging from the abutment with the turntable pin, and causing the rotating disk to start to rotate in the Figure 5 clockwise direction shown under the restoring force of the torsion spring, thereby driving the inner core to perform Figure 5 the clockwise synchronous rotation shown through the first pawl and the ratchet teeth, and further swapping the positions of the two filter chambers to complete the position switching of the two filter plates. Figure 6 In this embodiment, since two filter chambers are provided on the inner core and the central angle between the two filter chambers is 180 degrees, the turntable is in the

[0047] position shown under the restoring force of the torsion spring, that is, the switching pin is located at the end of the rotating slot, 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 crosses over the turntable pin and the switching pin, the rotating disk rotates reversely under the restoring force of the torsion spring, driving the inner core to rotate 180 degrees to complete the switching of the positions of the two filter chambers. Figure 5 As shown in combination with

[0048] Combined with Figure 6 shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, the filter 3 is also provided with a second pawl 24. The second pawl 24 is rotatably arranged on the filter housing 4 through a pawl torsion spring 41 and is connected to the ratchet teeth 22 provided on the inner core 5, enabling the inner core 5 to rotate unidirectionally relative to the filter housing 4, that is, enabling the inner core 5 to only perform Figure 6It rotates in the clockwise direction as shown. At this time, with the help of the second pawl, it can be further ensured that the rotating disk drives the inner core to rotate unidirectionally through the first pawl.

[0049] Meanwhile, in combination with Figure 6 As shown, in the tea seed oil supercritical carbon dioxide extraction device of this embodiment, the first pawl 23 is rotatably arranged on the rotating disk 15 through a reed 25, so that the first pawl 23 drives the inner core 5 to perform Figure 6 the clockwise rotation as shown.

[0050] In combination with 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 rotate relative to the filter housing 4 to turn the filter plate 6 to the position of the replacement cover 26, and the replacement cover 26 is detachably connected to the filter housing 4.

[0051] In this way, by rotating the filter plate that needs to be disassembled and replaced through the inner core to the replacement cover at the cleaning station, that is, Figure 2 the position where the replacement cover is shown, the replacement cover can be opened to disassemble and replace the filter plate, realizing the quick disassembly of the filter plate without affecting the normal operation of the extraction device.

[0052] In combination with 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 through a rotatably arranged locking pin 27, thus forming a detachable connection with the filter housing 4. Meanwhile, the filter plate 6 is fixedly connected to the inner core 5 through a fixing ring 40, such as a circlip, so that the filter plate 6 can be disassembled and replaced.

[0053] In combination with 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 further provided. Among them, 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 abut against the upper cover 29, making the upper cover 29 form a fixed connection with the filter housing 4, or move upward to disengage from the abutment against the upper cover 29, releasing the pressing 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.

[0054] In addition, in combination with Figure 2As 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.

[0055] 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:

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Specifically, after the carbon dioxide is pressurized, a temperature control liquid is introduced into the temperature control pipe 35 between the kettle body 1 and the inner cylinder 2 to control the internal temperature of the kettle body 1, so that the supercritical carbon dioxide liquid entering the inner cylinder 2 remains in the supercritical state. When the supercritical carbon dioxide liquid is mixed with the tea seed powder, the tea seed oil is dissolved in the supercritical carbon dioxide liquid to complete the dissolution work.

[0062] Step S4, filtration: The supercritical carbon dioxide liquid in the inner cylinder passes through the filter plate into the filtration chamber and flows out through the filtration outlet. The corrugated plate is controlled to reciprocate in the filtration chamber, driving the thorn needles at the ends of the corrugated plate to repeatedly pass through the filter holes on the filter plate.

[0063] Specifically, after the dissolution is completed, the supercritical carbon dioxide liquid in the inner cylinder 2 enters the filter housing 4, passes through the filter plate 6 into the filtration chamber 8 of the inner core 5, and flows out through the filtration outlet 9. During 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 further driving the corrugated plate 7 to reciprocate up and down in the filtration chamber 8, so that the thorn needles on the multiple corrugated plates 7 are sequentially inserted into the filter holes at the corresponding positions on the filter plate 6, pushing out the particles existing 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 corrugated plate 7 located at the non-working position, that is Figure 2 the corrugated plate 7 shown in the left position, can also dredge the filter plate 6 under the drive of the motor 10, so as to push out the solid particles in the filter holes on the filter plate 6 and fall on the replacement cover 26, and the replacement cover 26 collects the ejected tea liquid seed powder particles. At the same time, due to the start of the motor 10, the drive shaft 14 drives the connecting rod 18 to rotate in the Figure 5 counterclockwise direction shown. After the connecting rod 18 abuts against the turntable pin 19, the rotating disk 15 is pushed through the turntable pin 19 to rotate in the Figure 5 counterclockwise direction shown, while the inner core 5 remains stationary under the cooperation of the ratchet teeth 22, the first pawl 23 and the second pawl 24, and 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 under the action of the switching pin 16, the drive shaft 14 is driven to move upward against the spring 21, cross over the switching pin 16 and the turntable pin 19, and the connecting rod 18 is disengaged from the abutment with the turntable pin 19. The rotating disk 15 rotates in the Figure 5 clockwise direction shown under the restoring force of the torsion spring 17, and drives the inner core 5 to rotate synchronously under the cooperation of the ratchet teeth 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 groove 20, that is Figure 5As shown in the positional relationship between the switching pin 16 and the rotating groove 20, when the rotating disk 15 stops rotating, the inner core 5 drives the two filter chambers 8 to rotate 180 degrees to complete the position switching, that is, to complete the switching of the filter plate 6 between the working position and the cleaning position. The connecting rod 18 that crosses the switching pin 16 moves downward again to the upper surface of the rotating disk 15 under the action of the spring 21 and continues to rotate under the drive of the motor 10. When it rotates to Figure 5 the position shown, the rotating disk 15 can be pushed to rotate again through the turntable pin 19, so as to switch the positions of the two filter plates 6 again, forming an alternating filtration operation of the two filter plates 6. In addition, when the filter plate 6 needs to be disassembled, assembled and maintained, when there is no pressure inside the machine during shutdown, rotate the rotary locking pin 27 and turn the replacement cover 26 to open it, and disassemble and replace the filter plate 6.

[0064] Step S5, separation: The filtered supercritical carbon dioxide liquid flows into the separation kettle to separate the tea seed oil.

[0065] Specifically, when the filtered supercritical carbon dioxide liquid flows into the first separation kettle 36, due to the change of pressure and temperature, the carbon dioxide vaporizes and flows out, leaving the tea seed oil in the first separation kettle 36. The carbon dioxide gas mixed with the tea seed oil vapor enters the second separation kettle 37 for further separation, so that the carbon dioxide is purified and discharged, completing the separation work.

[0066] Step S6, discharging: Open the separation kettle to discharge the tea seed oil, completing the discharging.

[0067] Specifically, after the extraction work is completed, open the first electromagnetic valve 38 on the first separation kettle 36 and the second electromagnetic valve 39 on the second separation kettle 37 to discharge the tea seed oil separated into the first separation kettle 36 and the second separation kettle 37, completing the discharging.

[0068] In addition, in the above step S6, the carbon dioxide separated and discharged from the first separation kettle 36 and the second separation kettle 37 can be recycled by flowing back to the inlet of the high-pressure pump 33 through the pipeline.

Claims

1. A tea seed oil supercritical carbon dioxide extraction device, characterized in that: The invention 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 arranged 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 a filter outlet is arranged at the upper end of the filter cavity; the wave plate is arranged in the filter cavity and can reciprocate in the vertical direction relative to the filter plate, so as to drive the needle at the end of the wave plate to repeatedly pass through the filter holes on the filter plate; The filter comprises a motor and a control shaft; the motor is in driving connection with the control shaft, the control shaft adopts a crankshaft structure and is rotatably connected with the inner core, the wave plate is slidably arranged with the inner core in a vertical direction and the upper end of the wave plate is rotatably connected with the control shaft; 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; 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.

2. The tea seed oil supercritical carbon dioxide extraction device according to claim 1, 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.

3. The tea seed oil supercritical carbon dioxide extraction device according to claim 2, 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.

4. The tea seed oil supercritical carbon dioxide extraction device according to claim 3, 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.

5. 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.

6. 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.

7. 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 6 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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